$Silicon carbide refractory brick$

Silicon carbide refractory brick

Silicon Carbide Refractory Bricks I. Product Types and Classification Standards Oxide-Bonded Type (SC-O): SiC content 70–80%, silicate-bonded phase 15–20%; bulk density 2.5–2.7 g/cm³; service temperature ≤1350°C Nitride-Bonded Type (SC-N): Si₃N₄/Si₂N₂O bonding phase 20–30%; SiC content ≥85%; high-temperature strength (at 1400°C) ≥30 MPa Self-Bonded Type (SC-RB): Recrystallized silicon carbide (SiC ≥99%); apparent porosity ≤15%; thermal conductivity 120 W/(m·K). New Composite Products: Gradient Structure—working face SiC 95% → transition layer 80% → matrix layer 65%; nano-SiC coating (wear resistance improved by 50%). II. Advanced Production Processes Raw Material Processing System: SiC particle size grading (3–1 mm : 1–0.1 mm : <0.1 mm = 4:3:3); surface modification of silicon nitride powder (D50 = 0.8 μm); intelligent forming processes, including isostatic pressing (pressure 200–250 MPa) and 3D printing for precision shaping of complex components; special sintering technologies such as atmosphere-protected sintering (N₂, 1800–2200°C) and spark plasma sintering (SPS), which reduces the sintering cycle by 80%; post-processing techniques including chemical vapor deposition (CVD) for surface densification and laser precision machining with tolerances of ±0.1 mm. III. Core Application Areas in 2026 Industry Applications Typical Components Performance New Energy Lithium-Ion Battery Sintering Furnaces: Roller rods’ service life extended to 5 years Electronic Materials Silicon Carbide Single-Crystal Growth Furnaces: Crucibles—thermal field uniformity improved by 30% Environmental Protection Hazardous Waste Incinerators: Lining—corrosion resistance enhanced by 60% Aerospace Rocket Engine Nozzles: Temperature resistance up to 2000°C IV. Comparative Performance Advantages vs. Traditional Materials Thermal Conductivity: 120 W/(m·K) (high-alumina bricks only 2.1); Wear Resistance: Volumetric wear ≤0.5 cm³ (ASTM C704); Thermal Shock Resistance: 50 cycles (water quenching at 1100°C); Economic Indicators Initial Cost: 40% lower than zirconia-corundum bricks; Maintenance Interval: 8–10 years (traditional materials 3–5 years). V. Physicochemical Specifications (GB/T 2026–SC) 1. Basic Properties (SC-N Type): — Bulk Density: 2.7–2.9 g/cm³ — Apparent Porosity: 12–15% — Cold Crushing Strength: ≥150 MPa High-Temperature Characteristics: — Load Softening Point (0.2 MPa): ≥1650°C — Flexural Strength (at 1400°C): ≥35 MPa Special Properties: — Resistance to Molten Aluminum Erosion: ≤1.2 mm/100 h (at 900°C) — Coefficient of Thermal Expansion: 4.5 × 10⁻⁶/°C (20–1000°C)

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Description:

Silicon carbide refractory brick

I. Product Types and Classification Standards

Oxide-bonded ( SC-O)

SiC content: 70–80%; silicate-bonded phase: 15–20%.
Bulk density 2.5–2.7 g/cm³
Applicable temperature ≤1350℃

Nitride-bonded ( SC-N)

Si₃N₄/Si₂N₂O bonding phase: 20–30%
SiC content ≥ 85%
High-temperature strength ( 1400℃) ≥30 MPa

Self-combining type ( SC-RB)

Recrystallized silicon carbide ( SiC ≥ 99%)
Apparent porosity ≤ 15%
Thermal conductivity 120 W/(m·K)

New composite product

Gradient Structure: Working Face SiC 95% → Transition layer 80% → Matrix layer 65%
nanometer SiC coating (50% improvement in wear resistance)

II. Advanced Production Process

Raw Material Processing System

SiC particle size distribution (3–1 mm : 1–0.1 mm : <0.1 mm = 4 : 3 : 3)
Surface modification of silicon nitride powder ( D50 = 0.8 μm)

Intelligent Molding Process

Isostatic pressing (pressure 200–250 MPa)
3D Printing for Precision Forming (Complex Structural Components)

Special Sintering Technology

Atmosphere-protected sintering ( N₂, 1800–2200℃)
Spark Plasma Sintering ( SPS) Cycle shortened by 80%

Post-processing technology

Chemical vapor deposition ( CVD) Surface Densification
Laser precision machining (tolerance ±0.1 mm)

III. Core Application Areas in 2026

Application Industries	Typical site	Performance
New energy	Lithium Battery Sintering Furnace Roller Rod	Life expectancy extended to 5 years
Electronic materials	Silicon Carbide Crystal Growth Furnace Crucible	30% improvement in thermal field uniformity
Environmental protection	Lining of Hazardous Waste Incinerator	Corrosion resistance improved by 60%
Aerospace	Rocket engine nozzle	Withstands temperatures up to 2000℃

IV. Comparative Analysis of Performance Advantages

Comparison with Traditional Materials

Thermal conductivity: 120 W/(m·K) (only 2.1 for high-alumina bricks)
Wear Resistance: Volumetric Wear ≤ 0.5 cm³ (ASTM C704)
Thermal shock resistance: 50 cycles (1100°C water cooling)

Economic indicators

Initial cost: lower than zirconia-alumina bricks 40%
Maintenance cycle: 8–10 years (3–5 years for traditional materials)

V. Physicochemical Indices ( GB/T 2026-SC)

1. Basic performance ( SC-N Type):

- Bulk density: 2.7–2.9 g/cm³

- Apparent porosity: 12-15%- Room-temperature pressure resistance: ≥150 MPa

High-temperature characteristics:

- Load-softening point ( 0.2MPa ): ≥1650℃

- Flexural strength ( 1400°C ): ≥35 MPa

Special Features:

- Aluminum melt erosion resistance: ≤1.2 mm/100 h （ 900°C )

- Coefficient of thermal expansion: 4.5×10⁻⁶/°C （ 20–1000°C )

Keywords:

Silicon carbide refractory brick

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Sintered zirconia-alumina brick

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Email：zzjsrefractory@gmail.com

Silicon carbide refractory brick

Silicon carbide refractory brick

I. Product Types and Classification Standards

II. Advanced Production Process

III. Core Application Areas in 2026

IV. Comparative Analysis of Performance Advantages

V. Physicochemical Indices ( GB/T 2026-SC)

COOKIES

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