Silica-mullite composite brick
Silica-mullite composite brick
Silica-mullite composite brick
Silica-mullite composite brick
Silica-mullite composite brick
Silica-mullite composite brick
Silica-mullite composite brick
Silica-mullite composite brick
Silica-mullite composite brick
Silica-mullite composite brick

Silica-mullite composite brick

Silicon–Mullite Refractory Bricks I. Product Types and Characteristics Standard Silicon–Mullite Brick (GM-1650): Composition: SiC 8–15%, Al₂O₃ 70–75%; Bulk Density: 2.65–2.75 g/cm³; Load Softening Point: ≥1650°C. Silicon–Mullite Red Brick (GMR-1700): Contains 10–15% andalusite; Thermal Shock Resistance: ≥25 cycles (water quenching at 1100°C); Thermal Conductivity: 1.8 W/(m·K). 2025 New Composite Products: Silicon Carbide Gradient Distribution (surface SiC 18%, core 8%); Nano-SiO₂ Coating (alkali resistance improved by 40%); Porous Structure Design (thermal conductivity reduced by 30%). II. Intelligent Production Process Raw Material Pre-treatment: Silicon Carbide Purification (SiC ≥98%); High-Alumina Bauxite AI Ore Blending (Al₂O₃ variation ≤0.8%); Composite Mixing Technology: Three-Dimensional Motion Mixing (uniformity CV ≤0.6%); In-situ Mullitization Control (pre-firing at 1450°C); Digital Press Molding: Hydraulic Press Pressure: 180–220 MPa; Online Laser Inspection (dimensional accuracy ±0.5 mm); Green Sintering Process: Hydrogen-Fueled Tunnel Kiln (1550–1600°C); Waste Heat Power Generation System (energy consumption reduced by 28%). III. Applications Application Areas Usage Locations Technical Benefits Cement Rotary Kiln Transition Zone Service Life Extended to 18 Months Steel Hot Blast Stove Dome Energy Consumption Reduced by 15% Environmental Hazardous Waste Incinerator Corrosion Resistance Improved by 60% New Energy Lithium-Ion Battery Sintering Kiln Temperature Uniformity ±5°C IV. Performance Advantages Compared with Traditional Materials Wear Resistance: ≥3 times that of high-alumina bricks; Thermal Shock Stability: ≥2 times that of spinel bricks; Cost Performance: 40–50% lower than chrome-corundum bricks. 2025 Technological Innovations: Surface Self-Repair Technology (SiO₂ Protective Film); Intelligent Thermal Barrier Coating (infrared reflectance ≥85%). V. Latest Physicochemical Indices (GB/T 2026–GM) 1. Basic Properties (GM-1650): Apparent Porosity: 16–18%; Compressive Strength at Room Temperature: ≥90 MPa; Flexural Strength (at 1400°C): ≥12 MPa. 2. High-Temperature Characteristics: Thermal Expansion Coefficient: 5.2×10⁻⁶/°C (20–1000°C); Linear Change after Reheating: ≤0.3% (1600°C × 3 h). 3. Special Indicators: Alkali Resistance (K₂CO₃): ≤1.0 mm/100 h; Thermal Conductivity (at 1000°C): 2.3 W/(m·K).

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Silica-mullite refractory brick

I. Product Types and Characteristics

  1. Standard silica-mullite brick ( GM-1650)
  • Ingredient composition: SiC 8–15%, Al₂O₃ 70–75%
  • Bulk density: 2.65–2.75 g/cm³
  • Load-softening temperature: ≥1650°C
  1. Silicon-molybdenum red brick ( GMR-1700)
  • Add 10–15% andalusite
  • Thermal shock resistance: ≥25 cycles (water quenching at 1100°C)
  • Thermal conductivity: 1.8 W/(m·K)
  1. 2025 New Composite Products
  • Silicon carbide gradient distribution (surface SiC 18%, internal 8%)
  • nanometer SiO₂ coating (alkali resistance improved by 40%)
  • Porous structural design (reduced thermal conductivity) 30%)

II. Intelligent Production Process

  1. Raw Material Preprocessing
  • Silicon carbide purification treatment ( SiC ≥ 98%)
  • High-alumina bauxite AI-based ore blending (Al₂O₃ variation ≤ 0.8%)
  1. Compound Mixing Technology
  • Three-dimensional motion mixing (uniformity CV ≤ 0.6%)
  • In-situ mullitization control ( Pre-sintering at 1450℃
  1. Digital compression molding
  • Hydraulic press pressure: 180-220MPa
  • Online laser inspection (dimensional accuracy ±0.5 mm)
  1. Green Sintering Process
  • Hydrogen-fired tunnel kiln ( 1550–1600℃)
  • Waste Heat Power Generation System (Energy Consumption Reduction 28%)

III. Applications

Application Fields

Part used

Technical Benefits

Cement

Transition Zone of Rotary Kiln

Lifespan extended to 18 months

Steel

Hot-blast stove dome

Energy consumption reduced by 15%

Environmental protection

Hazardous Waste Incinerator

60% improvement in erosion resistance

New energy

Lithium Battery Sintering Kiln

Temperature uniformity ±5℃

IV. Performance Advantage Comparison

  1. Comparison with Traditional Materials
  • Wear resistance: ≥ 3 times that of high-alumina bricks
  • Thermal shock resistance: ≥ twice that of spinel bricks
  • Cost-effectiveness: lower than chrome corundum bricks. 40-50%
  1. 2025 Technological Innovation
  • Surface self-healing technology ( SiO₂ protective film)
  • Intelligent Thermal Barrier Coating (Infrared Reflectance ≥ 85%)

V. Latest Physicochemical Indices ( GB/T 2026-GM)

1. Basic performance ( GM-1650 ):

Apparent porosity: 16-18%- Room-temperature pressure resistance: ≥90 MPa - Flexural strength ( 1400°C ): ≥12 MPa

2. High-temperature characteristics: -  Coefficient of thermal expansion: 5.2×10⁻⁶/°C （ 20–1000°C ) -  Change in the re-burning line: ≤0.3% （ 1600℃ × 3 h ) 3.  Special indicators: -  Alkali resistance ( Potassium carbonate ): ≤1.0 mm/100 h - Thermal conductivity ( 1000℃ ): 2.3 W/(m·K)

 

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Silica-mullite composite brick

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