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Electrofused α‑β Corundum Refractory Special-Shaped Bricks
Electrofused α-β corundum refractory bricks: main product types and compositional characteristics ZM-α type (α-corundum-based): composition—α-Al₂O₃ ≥ 90%, Na₂O ≤ 0.3%; characteristics—outstanding high-temperature stability; hardness (Mohs scale 9.2) close to that of pure corundum. ZM-G type (α-β composite): composition—α/β-Al₂O₃ ≈ 50:50, Na₂O 1.2–1.8%; characteristics—interwoven crystalline structure; below 1350°C, resistance to glass erosion comparable to zirconia-corundum. ZM-U type (β-corundum-based): composition—predominantly β-Al₂O₃ (Na₂O ≥ 5%); characteristics—plate-like coarse-grained structure; good resistance to strong alkali but lower mechanical strength. Modern production process: Raw material preparation: use calcined alumina with purity ≥ 95%, with Na₂CO₃ as a mineralizer (to control the formation of the β phase). Three-phase arc furnace melting (≥ 2300°C), oxidation process; carbon content ≤ 0.05%. Precision casting: conventional pouring (RC)—shrinkage cavities located at the lower part of the pour mouth, suitable for low-temperature applications; vacuum forming (VF)—pour mouth area removed, residual shrinkage cavities ≤ 5 mm. Post-processing: annealing at 1600°C for 72 hours to relieve internal stresses. CNC machining accuracy up to ±0.3 mm, pre-assembly deviation ≤ 1 mm/m. Key application areas: Glass industry: full lining of the working pool (ZM-G type VF bricks) to reduce glass bubbles; feeders and feeder channels (ZM-G type), with glass contamination index ≤ 0.5 ppm. High-temperature industry: lining of graphitization furnaces (ZM-α type), with service life three times that of conventional materials; sintering kilns for electronic ceramics (ZM-U type), resistant to spodumene melts. Special applications: transition sections of tin baths in photovoltaic glass production, with thermal shock resistance > 30 cycles (water cooling at 1100°C). Characteristics of ZM-G type electrofused zirconia-corundum bricks: No glass phase exudation at temperatures ≥ 1400°C; thermal conductivity (at 1000°C) 2.1 W/(m·K) for standard grades and 3.8 W/(m·K) for enhanced grades; resistance to alkaline vapor attack, with weight gain ≤ 0.5%; weight gain 2–3%; service life in glass furnaces 5–7 years for standard grades and 7–10 years for enhanced grades. Performance comparison advantages: note that under conditions below 1350°C, cost-effectiveness exceeds that of zirconia-corundum by more than 30%. Core physicochemical parameters: Basic physical properties: bulk density 3.25–3.40 g/cm³ (RC type); apparent porosity ≤ 4% (VF-finished surfaces). High-temperature performance: load-softening temperature (0.2 MPa) ≥ 1700°C [1]; resistance to glass erosion (1350°C/72 h) ≤ 0.8 mm penetration. Special indicators: β-phase transformation rate 50 ± 5% (ZM-G type) [9]; coefficient of thermal expansion (20–1000°C) 8.5 × 10⁻⁶/°C. Latest technological developments: gradient composite products launched in 2025 (80% α phase on the working surface, 30% β phase in the transition layer), increasing thermal shock resistance to 45 cycles.
Electrofused α‑β corundum refractory bricks
The main product types and compositional characteristics of electrofused α–β corundum refractory bricks are as follows: ZM-α type (α‑corundum based): Composition—α-Al₂O₃ ≥ 90%, Na₂O ≤ 0.3%. Characteristics: Outstanding high‑temperature stability; hardness (9.2 on the Mohs scale) nearly equivalent to pure corundum. ZM-G type (α–β composite): Composition—α/β-Al₂O₃ ≈ 50:50, Na₂O 1.2–1.8%. Characteristics: A crystalline interwoven structure; below 1350°C, its resistance to glass erosion rivals that of zirconia‑corundum. ZM-U type (β‑corundum based): Composition—primarily β‑Al₂O₃ (Na₂O ≥ 5%). Characteristics: A plate‑like coarse‑grained structure; resistant to strong alkalis but with relatively lower strength. Modern production processes: Raw material processing: Pure calcined alumina with a purity ≥ 95% is used, with Na₂CO₃ serving as a mineralizer to control the formation of the β phase. Melting in a three‑phase arc furnace at temperatures ≥ 2300°C, followed by an oxidation‑based process to ensure carbon content ≤ 0.05%. Precision casting: Conventional casting (RC): Shrinkage cavities form in the lower portion of the casting sprue, making this method suitable for low‑temperature applications where shrinkage is not a concern. Vacuum forming (VF): The sprue area is removed, leaving residual shrinkage cavities no larger than 5 mm. Post‑processing: Annealing at 1600°C for 72 hours to relieve internal stresses. CNC machining achieves a precision of ±0.3 mm, with pre‑assembly tolerances ≤ 1 mm/m. Key application areas: Glass industry: Full wrapping of working pools with ZM-G type VF bricks to minimize glass bubbles; feed channels and feeder systems (ZM-G type), with a glass contamination index ≤ 0.5 ppm. High‑temperature industries: Lining of graphitization furnaces with ZM-α type bricks, extending service life up to three times that of conventional materials; sintering kilns for electronic ceramics (ZM-U type), capable of withstanding spodumene melts. Special applications: Transition sections of tin baths for photovoltaic glass, featuring thermal shock resistance exceeding 30 cycles (with water quenching at 1100°C). ZM-G type electrofused zirconia‑corundum bricks exhibit the following characteristics: Glass phase leaching temperature—no leaching occurs at temperatures ≥ 1400°C; thermal conductivity (at 1000°C)—2.1 W/(m·K) for RC bricks, compared to 3.8 W/(m·K) for VF‑finished surfaces. Resistance to alkali vapor erosion—weight gain ≤ 0.5%; weight gain 2–3%. Service life (in glass kilns): 5–7 years for RC bricks, 7–10 years for VF‑finished bricks. Performance comparison and advantages: Note that under operating conditions below 1350°C, these bricks offer cost‑performance benefits exceeding 30% over zirconia‑corundum. Core physicochemical parameters: Basic properties: —Bulk density: 3.25–3.40 g/cm³ (for RC type); apparent porosity: ≤ 4% (on VF‑finished surfaces). High‑temperature performance: —Load softening temperature (0.2 MPa): ≥ 1700°C [1]; —Resistance to glass erosion (1350°C/72 h): ≤ 0.8 mm penetration. 3. Special indicators: —β‑phase conversion rate: 50 ± 5% (for ZM-G type) [9]; —Coefficient of thermal expansion (20–1000°C): 8.5 × 10⁻⁶/°C. Latest technological developments: In 2025, a gradient‑composite product was launched—with an 80% α‑phase on the working surface and a 30% β‑phase in the transition layer—boosting thermal shock resistance to 45 cycles.
Electrofused α-β corundum refractory bricks: main product types and compositional characteristics ZM-α type (α-corundum-based): composition—α-Al₂O₃ ≥ 90%, Na₂O ≤ 0.3%; characteristics—outstanding high-temperature stability; hardness (Mohs scale 9.2) close to that of pure corundum. ZM-G type (α-β composite): composition—α/β-Al₂O₃ ≈ 50:50, Na₂O 1.2–1.8%; characteristics—interwoven crystalline structure; below 1350°C, resistance to glass erosion comparable to zirconia-corundum. ZM-U type (β-corundum-based): composition—predominantly β-Al₂O₃ (Na₂O ≥ 5%); characteristics—plate-like coarse-grained structure; good resistance to strong alkali but lower mechanical strength. Modern production process: Raw material preparation: uses calcined alumina with purity ≥ 95%, with Na₂CO₃ as a mineralizer (to control the formation of the β phase). Three-phase arc furnace melting (≥ 2300°C), using an oxidation process with carbon content ≤ 0.05%. Precision casting: conventional pouring (RC)—shrinkage cavities located at the lower part of the pour mouth, suitable for low-temperature applications; vacuum forming (VF)—the pour mouth area is removed, leaving residual shrinkage cavities ≤ 5 mm. Post-processing: annealing at 1600°C for 72 hours to relieve internal stresses. CNC machining accuracy reaches ±0.3 mm, with pre-assembly dimensional deviation ≤ 1 mm/m. Key application areas: Glass industry: full lining of the working pool (ZM-G type VF bricks) to reduce glass bubbles; feed channels and feeder systems (ZM-G type), with a glass contamination index ≤ 0.5 ppm. High-temperature industry: lining for graphitization furnaces (ZM-α type), with service life three times that of conventional materials; sintering kilns for electronic ceramics (ZM-U type), resistant to spodumene melt. Special applications: transition sections of tin baths in photovoltaic glass production, with thermal shock resistance > 30 cycles (water cooling from 1100°C). Characteristics of ZM-G type electrofused zirconia-corundum bricks: No glass phase exudation at temperatures ≥ 1400°C; thermal conductivity (at 1000°C) 2.1 W/(m·K) for standard grades and 3.8 W/(m·K) for enhanced grades; resistance to alkaline vapor corrosion with weight gain ≤ 0.5%; weight gain of 2–3% under such conditions; service life in glass kilns: 5–7 years for standard grades and 7–10 years for enhanced grades. Performance comparison advantages: note that under operating conditions below 1350°C, cost-effectiveness exceeds that of zirconia-corundum by more than 30%. Core physicochemical parameters: Basic physical properties: bulk density 3.25–3.40 g/cm³ (RC type); apparent porosity ≤ 4% (VF-finished surfaces). High-temperature performance: Load-softening temperature (0.2 MPa): ≥ 1700°C [1]; resistance to glass erosion (1350°C/72 h): penetration ≤ 0.8 mm. Special indicators: β-phase transformation rate: 50 ± 5% (ZM-G type) [9]; coefficient of thermal expansion (20–1000°C): 8.5 × 10⁻⁶/°C. Latest technological developments: gradient composite products launched in 2025 (with 80% α phase on the working surface and 30% β phase in the transition layer), increasing thermal shock resistance to 45 cycles.
41# Pool Wall Without Sinkholes
The Main Types of Electrofused Zirconia‑Alumina Refractory Bricks – Electrofused Zirconia‑Alumina Bricks (AZS Bricks) – are classified into three categories based on their ZrO₂ content: AZS-33#: ZrO₂ content 32–36%, with the remainder Al₂O₃ and SiO₂ ≤16%. These bricks are primarily used in non‑directly erosive areas such as the upper structure of glass furnaces and the walls of the working pool. AZS-36#: With ZrO₂ content ranging from 35% to 40% and a lower glass phase content, these bricks are ideal for the hot spots within the glass melting pool. AZS-41#: Featuring ZrO₂ content between 40% and 44%, these bricks offer the best erosion resistance and are employed in critical areas such as the flow channels and furnace sill. The production process relies on the core technique of oxidative fusion: Ingredient Mixing and Melting: Zircon sand (ZrO₂ ≥ 65%) is proportionally blended with industrial alumina and melted in an electric arc furnace at 2000°C, followed by oxygen blowing to remove carbon (carbon content ≤ 0.02%). Casting and Shaping: Four casting methods are employed: conventional casting (PT), inclined casting (QX), shrinkage‑free casting (WS), and quasi‑shrinkage‑free casting (ZWS), all designed to precisely control the location of shrinkage cavities. Annealing Treatment: The bricks are placed in an annealing kiln and subjected to a stepwise cooling process from 700°C to 600°C, then to 450°C, taking approximately 2 hours to reach 150°C. Mechanical Machining: The cast risers are cut to achieve dimensional accuracy within ±0.5 mm. Application Scenarios: Glass Industry: Accounting for 90% of applications, these bricks are used in pool walls (36#), feed ports (41#), flow channels (WS type), and other critical areas, with service lives ranging from 5 to 8 years. Steel Metallurgy: Used in tundish sliders and RH furnace immersion tubes, offering superior resistance to molten steel erosion. Chemical Industry: Served as linings for coal gasification furnaces, capable of withstanding acidic media. Electronic Glass: Employed in key components of LCD glass melting furnaces, ensuring compliance with stringent high‑purity requirements. Performance Advantages: Ultra‑strong corrosion resistance: The erosion rate against sodium‑calcium glass is ≤1.5 mm/24 h (at 1500°C). High‑temperature stability: The load‑softening temperature is ≥1700°C, with no shrinkage. Low pollution: The bubble formation rate in products manufactured via the oxidation method is ≤2% (at 1300°C). Dense microstructure: Apparent porosity ≤2%, with a bulk density of 3.7–3.9 g/cm³. Physical and Chemical Specifications (taking AZS‑41# as an example): | Parameter | Range | Test Standard | | --- | --- | --- | | ZrO₂ Content | 40–44% | GB/T 4984 | | Glass Phase Leaching Temperature | ≥1400°C | JC/T 494 | | Thermal Expansion Rate (at 1000°C) | 0.7–0.9% | GB/T 7320 | | Resistance to Glass Molten Erosion | ≤1.3 mm/24 h | JC/T 805 | | Bulk Density (WS Type) | 3850 kg/m³ | Enterprise Standard | Note: WS‑type products undergo a process that removes shrinkage cavities, increasing the effective usable volume by 15%.
41# Non-Shrink Electrofused Zirconia-Alumina Brick
The Main Types of Electrofused Zirconia‑Alumina Refractory Bricks – Electrofused Zirconia‑Alumina Bricks (AZS Bricks) – are classified into three categories based on their ZrO₂ content: AZS-33#: ZrO₂ content 32–36%, with the remainder Al₂O₃ and SiO₂ ≤ 16%. These bricks are primarily used in non‑directly erosive areas such as the upper structure of glass furnaces and the walls of the working pool. AZS-36#: ZrO₂ content 35–40%, featuring a lower glass phase content and ideal for use in the hot spots of the glass melting pool. AZS-41#: ZrO₂ content 40–44%, offering the best erosion resistance and suitable for critical components such as the flow channel and kiln sill. The production process employs the core technique of oxidative fusion:配料熔融: Zircon sand (ZrO₂ ≥ 65%) is proportionally mixed with industrial-grade alumina and melted in an electric arc furnace at 2000°C, followed by oxygen blowing to remove carbon (carbon content ≤ 0.02%). Casting and Shaping: Four casting methods are utilized: conventional casting (PT), inclined casting (QX), shrinkage‑free casting (WS), and quasi‑shrinkage‑free casting (ZWS), all designed to precisely control the location of shrinkage cavities. Annealing Treatment: The bricks are placed in an annealing kiln and subjected to a step‑wise cooling process from 700°C to 600°C and then to 450°C, taking approximately 2 hours to reach 150°C. Mechanical Machining: The cast risers are cut to achieve dimensional accuracy within ±0.5 mm. Application Scenarios: Glass Industry: Accounting for 90% of applications, these bricks are used in pool walls (36#), feed ports (41#), flow channels (WS type), and other critical areas, with service lives ranging from 5 to 8 years. Steel Metallurgy: Used in ladle slides and RH furnace immersion tubes, providing excellent resistance to molten steel erosion. Chemical Industry: Served as linings for coal gasification furnaces, capable of withstanding acidic media. Electronic Glass: Employed in key components of LCD glass melting furnaces, ensuring compliance with stringent high‑purity requirements. Performance Advantages: Ultra‑strong corrosion resistance: The erosion rate against sodium‑calcium glass is ≤ 1.5 mm/24 h (at 1500°C). High‑temperature stability: The load‑softening temperature is ≥ 1700°C, with no shrinkage. Low pollution: The bubble formation rate during oxidative production is ≤ 2% (at 1300°C). Dense microstructure: Apparent porosity ≤ 2%, with a bulk density of 3.7–3.9 g/cm³. Physical and Chemical Indicators (taking AZS‑41# as an example): | Indicator | Parameter Range | Test Standard | ZrO₂ Content | 40–44% | GB/T 4984 | Glass Phase Leaching Temperature | ≥ 1400°C | JC/T 494 | Thermal Expansion Coefficient (1000°C) | 0.7–0.9% | GB/T 7320 | Resistance to Glass Molten Erosion | ≤ 1.3 mm/24 h | JC/T 805 | Bulk Density (WS Type) | 3850 kg/m³ | Enterprise Standard | Note: WS‑type products undergo shrinkage‑cavity removal, increasing the effective usable volume by 15%.
41# Electrofused Zirconia-Alumina Brick
The Main Types of Electrofused Zirconia‑Alumina Refractory Bricks – Electrofused Zirconia‑Alumina Bricks (AZS Bricks) – are classified into three categories based on their ZrO₂ content: AZS-33#: ZrO₂ content 32–36%, with the remainder Al₂O₃ and SiO₂ ≤ 16%. These bricks are primarily used in non‑directly erosive areas such as the upper structure of glass furnaces and the walls of the working pool. AZS-36#: With a ZrO₂ content of 35–40% and an even lower glass phase content, these bricks are ideal for the hot spots within the glass melting pool. AZS-41#: Featuring a ZrO₂ content of 40–44%, these bricks offer the best erosion resistance and are employed in critical areas such as the flow channels and kiln sill. The production process relies on the core technique of oxidative fusion: Ingredient Mixing and Melting: Zircon sand (ZrO₂ ≥ 65%) is proportionally blended with industrial alumina and melted in an electric arc furnace at 2000°C, followed by oxygen blowing to remove carbon (carbon content ≤ 0.02%). Casting and Shaping: Four casting methods are employed: conventional casting (PT), inclined casting (QX), shrinkage‑free casting (WS), and quasi‑shrinkage‑free casting (ZWS), all designed to precisely control the location of shrinkage cavities. Annealing Treatment: The bricks are placed in an annealing kiln and subjected to a stepwise cooling process from 700°C to 600°C and then to 450°C, taking approximately 2 hours to reach 150°C. Mechanical Machining: The cast risers are cut to achieve dimensional accuracy within ±0.5 mm. Application Scenarios: Glass Industry: Accounting for 90% of applications, these bricks are used in pool walls (36#), feed ports (41#), flow channels (WS type), and other critical areas, with service lives ranging from 5 to 8 years. Steel Metallurgy: Used in tundish sliders and RH furnace immersion tubes, offering superior resistance to molten steel erosion. Chemical Industry: Served as linings for coal gasification furnaces, providing excellent resistance to acidic media. Electronic Glass: Employed in key components of LCD glass melting furnaces, ensuring compliance with stringent high‑purity requirements. Performance Advantages: Exceptional Corrosion Resistance: The rate of erosion by soda‑lime glass is ≤ 1.5 mm/24 h (at 1500°C). High Temperature Stability: The load‑softening temperature is ≥ 1700°C, with no shrinkage. Low Pollution: The bubble formation rate in products manufactured via the oxidation method is ≤ 2% (at 1300°C). Dense Microstructure: Apparent porosity is ≤ 2%, with a bulk density of 3.7–3.9 g/cm³. Physical and Chemical Specifications (taking AZS-41# as an example): | Parameter | Range | Test Standard | | --- | --- | --- | | ZrO₂ Content | 40–44% | GB/T 4984 | | Glass Phase Leaching Temperature | ≥ 1400°C | JC/T 494 | | Thermal Expansion (at 1000°C) | 0.7–0.9% | GB/T 7320 | | Resistance to Glass Molten Erosion | ≤ 1.3 mm/24 h | JC/T 805 | | Bulk Density (WS Type) | 3850 kg/m³ | Enterprise Standard | Note: WS‑type products undergo a process that removes shrinkage cavities, increasing the effective usable volume by 15%.
36# Non-Shrink Electrofused Zirconia-Alumina Brick
The Main Types of Electrofused Zirconia‑Alumina Refractory Bricks – Electrofused Zirconia‑Alumina Bricks (AZS Bricks) – are classified into three categories based on their ZrO₂ content: AZS-33#: ZrO₂ content 32–36%, with the remainder Al₂O₃ and SiO₂ ≤ 16%. These bricks are primarily used in non‑directly erosive areas such as the upper structure of glass furnaces and the walls of the working pool. AZS-36#: ZrO₂ content 35–40%, featuring a lower glass phase content and ideal for use in the hot spots of the glass melting pool. AZS-41#: ZrO₂ content 40–44%, offering the best erosion resistance and suitable for critical components such as flow channels and furnace sill lines. The production process employs the core technique of oxidative fusion:配料熔融: Zircon sand (ZrO₂ ≥ 65%) is proportionally mixed with industrial-grade alumina and melted in an electric arc furnace at 2000°C, followed by oxygen blowing to remove carbon (carbon content ≤ 0.02%). Casting and Shaping: Four casting methods are utilized: conventional casting (PT), inclined casting (QX), shrinkage‑free casting (WS), and quasi‑shrinkage‑free casting (ZWS), all designed to precisely control the location of shrinkage cavities. Annealing Treatment: The bricks are placed in an annealing kiln and subjected to a stepwise cooling process from 700°C to 600°C and then to 450°C, taking approximately 2 hours to reach 150°C. Mechanical Machining: The cast risers are cut to achieve dimensional accuracy within ±0.5 mm. Application Scenarios: Glass Industry: Accounting for 90% of applications, these bricks are used in pool walls (36#), feeder ports (41#), flow channels (WS type), and other critical areas, with service lives ranging from 5 to 8 years. Steel Metallurgy: Used in ladle slides and RH furnace immersion tubes, providing excellent resistance to molten steel erosion. Chemical Industry: Served as linings for coal gasification furnaces, capable of withstanding acidic media. Electronic Glass: Employed in key components of LCD glass melting furnaces, ensuring compliance with stringent high‑purity requirements. Performance Advantages: Superb Corrosion Resistance: The erosion rate against soda‑lime glass is ≤ 1.5 mm/24 h (at 1500°C). High Temperature Stability: The load‑softening temperature is ≥ 1700°C, with no shrinkage. Low Pollution: The bubble formation rate in products manufactured via the oxidation method is ≤ 2% (at 1300°C). Dense Microstructure: Apparent porosity ≤ 2%, with a bulk density of 3.7–3.9 g/cm³. Physical and Chemical Specifications (taking AZS-41# as an example): | Parameter | Range | Test Standard | | --- | --- | --- | | ZrO₂ Content | 40–44% | GB/T 4984 | | Glass Phase Leaching Temperature | ≥ 1400°C | JC/T 494 | | Thermal Expansion (at 1000°C) | 0.7–0.9% | GB/T 7320 | | Resistance to Glass Molten Erosion | ≤ 1.3 mm/24 h | JC/T 805 | | Bulk Density (WS Type) | 3850 kg/m³ | Enterprise Standard | Note: WS‑type products undergo a process that removes shrinkage cavities, increasing the effective usable volume by 15%.
36# Electrofused Zirconia-Alumina Brick
The Main Types of Electrofused Zirconia‑Alumina Refractory Bricks – Electrofused Zirconia‑Alumina Bricks (AZS Bricks) – are classified into three categories based on their ZrO₂ content: AZS-33#: ZrO₂ content 32–36%, with the remainder Al₂O₃ and SiO₂ ≤ 16%. These bricks are primarily used in non‑directly erosive areas such as the upper structure of glass furnaces and the walls of the working pool. AZS-36#: ZrO₂ content 35–40%, featuring a lower glass phase content, making them suitable for hot spots within the glass melting pool. AZS-41#: ZrO₂ content 40–44%, offering the best erosion resistance and employed in critical areas such as flow channels and furnace sill lines. The production process relies on the core technique of oxidative fusion: 配料熔融: Zircon sand (ZrO₂ ≥ 65%) is proportionally mixed with industrial-grade alumina and melted in an electric arc furnace at 2000°C, followed by oxygen blowing to remove carbon (carbon content ≤ 0.02%). Casting and Forming: Four casting methods are employed: conventional casting (PT), inclined casting (QX), shrinkage‑free casting (WS), and quasi‑shrinkage‑free casting (ZWS), all designed to precisely control the location of shrinkage cavities. Annealing: The bricks are placed in an annealing kiln and subjected to a stepwise cooling process from 700°C to 600°C to 450°C, taking approximately 2 hours to reach 150°C. Mechanical Machining: The cast risers are cut to achieve dimensional accuracy within ±0.5 mm. Application Scenarios: Glass Industry: Accounting for 90% of applications, these bricks are used in pool walls (36#), feeder ports (41#), flow channels (WS type), and other critical areas, with service lives ranging from 5 to 8 years. Steel Metallurgy: Used in ladle slides and RH furnace immersion tubes, providing excellent resistance to molten steel erosion. Chemical Industry: Served as linings for coal gasification furnaces, capable of withstanding acidic media. Electronic Glass: Employed in key components of LCD glass melting furnaces, ensuring compliance with stringent high‑purity requirements. Performance Advantages: Superb Corrosion Resistance: The erosion rate against soda‑lime glass is ≤ 1.5 mm/24 h (at 1500°C). High Temperature Stability: The load‑softening temperature is ≥ 1700°C, with no shrinkage. Low Pollution: The bubble formation rate during oxidative production is ≤ 2% (at 1300°C). Dense Microstructure: Apparent porosity ≤ 2%, with a bulk density of 3.7–3.9 g/cm³. Physical and Chemical Specifications (taking AZS-41# as an example): | Parameter | Range | Test Standard | | --- | --- | --- | | ZrO₂ Content | 40–44% | GB/T 4984 | | Glass Phase Leaching Temperature | ≥ 1400°C | JC/T 494 | | Thermal Expansion (at 1000°C) | 0.7–0.9% | GB/T 7320 | | Resistance to Glass Molten Erosion | ≤ 1.3 mm/24 h | JC/T 805 | | Bulk Density (WS Type) | 3850 kg/m³ | Enterprise Standard | Note: WS‑type products undergo a process that removes shrinkage cavities, increasing the effective usable volume by 15%.
33# Non-Shrink Electrofused Zirconia-Alumina Brick
The Main Types of Electrofused Zirconia‑Alumina Refractory Bricks – Electrofused Zirconia‑Alumina Bricks (AZS Bricks) – are classified into three categories based on their ZrO₂ content: AZS-33#: ZrO₂ content 32–36%, with the remainder Al₂O₃ and SiO₂ ≤ 16%. These bricks are primarily used in non‑directly erosive areas such as the upper structure of glass furnaces and the walls of the working pool. AZS-36#: With a ZrO₂ content of 35–40% and an even lower glass phase content, these bricks are ideal for the hot spots within the glass melting pool. AZS-41#: Featuring a ZrO₂ content of 40–44%, these bricks offer the best erosion resistance and are employed in critical areas such as the flow channels and furnace sill. The production process relies on the core technique of oxidative fusion: Ingredient Mixing and Melting: Zircon sand (ZrO₂ ≥ 65%) is proportionally blended with industrial alumina and melted in an electric arc furnace at 2000°C, followed by oxygen blowing to remove carbon (carbon content ≤ 0.02%). Casting and Shaping: Four casting methods are employed: conventional casting (PT), inclined casting (QX), shrinkage‑free casting (WS), and quasi‑shrinkage‑free casting (ZWS), all designed to precisely control the location of shrinkage cavities. Annealing Treatment: The bricks are loaded into the annealing kiln at 800°C and undergo a stepwise cooling process from 700°C → 600°C → 450°C, taking between 2 hours and 150°C. Mechanical Machining: The cast risers are cut to achieve dimensional accuracy within ±0.5 mm. Application Scenarios: Glass Industry: Accounting for 90% of applications, these bricks are used in pool walls (36#), feed ports (41#), flow channels (WS type), and other critical areas, with service lives ranging from 5 to 8 years. Steel Metallurgy: Used in tundish sliders and RH furnace immersion tubes, offering superior resistance to molten steel erosion. Chemical Industry: Served as linings for coal gasification furnaces, capable of withstanding acidic media. Electronic Glass: Employed in key components of LCD glass melting furnaces, ensuring compliance with stringent high‑purity requirements. Performance Advantages: Exceptional Corrosion Resistance: The erosion rate against soda‑lime glass is ≤ 1.5 mm/24 h (at 1500°C). High Temperature Stability: The load‑softening temperature is ≥ 1700°C, with no shrinkage. Low Pollution: The bubble formation rate during oxidative production is ≤ 2% (at 1300°C). Dense Microstructure: Apparent porosity ≤ 2%, with a bulk density of 3.7–3.9 g/cm³. Physical and Chemical Specifications (taking AZS-41# as an example): | Parameter | Range | Test Standard | | --- | --- | --- | | ZrO₂ Content | 40–44% | GB/T 4984 | | Glass Phase Leaching Temperature | ≥ 1400°C | JC/T 494 | | Thermal Expansion (at 1000°C) | 0.7–0.9% | GB/T 7320 | | Resistance to Glass Molten Erosion | ≤ 1.3 mm/24 h | JC/T 805 | | Bulk Density (WS Type) | 3850 kg/m³ | Enterprise Standard | Note: WS‑type products have their shrinkage zones carefully removed, increasing the effective usable volume by 15%.
33# Electrofused Zirconia-Alumina Brick
The Main Types of Electrofused Zirconia‑Alumina Refractory Bricks – Electrofused Zirconia‑Alumina Bricks (AZS Bricks) are classified into three categories based on their ZrO₂ content: AZS-33#: ZrO₂ content 32–36%, with the remainder Al₂O₃ and SiO₂ ≤16%. These bricks are primarily used in non‑directly erosive areas such as the upper structure of glass furnaces and the walls of the working pool. AZS-36#: ZrO₂ content 35–40%, featuring a lower glass phase content and ideal for use in the hot spots of the glass melting pool. AZS-41#: ZrO₂ content 40–44%, offering the best erosion resistance and suitable for critical components such as the flow channel and kiln sill. The production process employs the core technique of oxidative fusion:配料熔融: Zircon sand (ZrO₂ ≥ 65%) is proportionally mixed with industrial-grade alumina and melted in an electric arc furnace at 2000°C, followed by oxygen blowing to remove carbon (carbon content ≤ 0.02%). Casting and Shaping: Four casting methods are utilized—conventional casting (PT), inclined casting (QX), shrinkage‑free casting (WS), and quasi‑shrinkage‑free casting (ZWS)—to precisely control the location of shrinkage cavities. Annealing Treatment: The bricks are placed in an annealing kiln and subjected to a stepwise cooling process from 700°C to 600°C and then to 450°C, taking approximately 2 hours to reach 150°C. Mechanical Machining: The cast risers are cut to achieve dimensional accuracy within ±0.5 mm. Application Scenarios: Glass Industry: Accounting for 90% of applications, these bricks are used in pool walls (36#), feed ports (41#), flow channels (WS type), and other critical areas, with a service life of 5–8 years. Steel Metallurgy: Used in tundish sliders and RH furnace immersion tubes, providing excellent resistance to molten steel erosion. Chemical Industry: Served as lining for coal gasification furnaces, capable of withstanding acidic media. Electronic Glass: Employed in key components of LCD glass melting furnaces, ensuring compliance with stringent high‑purity requirements. Performance Advantages: Ultra‑strong corrosion resistance: The erosion rate against soda‑lime glass is ≤1.5 mm/24 h (at 1500°C). High‑temperature stability: The load‑softening temperature is ≥1700°C, with no shrinkage. Low pollution: The bubble formation rate in products manufactured via the oxidation method is ≤2% (at 1300°C). Dense microstructure: Apparent porosity ≤2%, with a bulk density of 3.7–3.9 g/cm³. Physical and Chemical Specifications (taking AZS‑41# as an example): | Parameter | Range | Test Standard | | --- | --- | --- | | ZrO₂ Content | 40–44% | GB/T 4984 | | Glass Phase Leaching Temperature | ≥1400°C | JC/T 494 | | Thermal Expansion Rate (1000°C) | 0.7–0.9% | GB/T 7320 | | Resistance to Glass Molten Erosion | ≤1.3 mm/24 h | JC/T 805 | | Bulk Density (WS Type) | 3850 kg/m³ | Enterprise Standard | Note: WS‑type products undergo a process that removes shrinkage cavities, increasing the effective usable volume by 15%.
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Address: Chengguan Industrial Zone, Xinmi City, Henan Province
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