4 Inch Insulation Rigid Felt - Body

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Insulation Rigid Felt is a kind of composite insulation material specially designed for high temperature extreme environment, the use of carbon fiber and carbon cloth lamination composite process, combined with high temperature carbonization/graphitization treatment technology, has ultra-high purity (ash ≤10ppm), excellent thermal stability and mechanical strength. The material is designed for use in thermal insulation systems in silicon carbide (SiC) single crystal growth furnaces to meet the demanding thermal field uniformity, temperature gradient and impurity control requirements of the physical vapor transfer (PVT) method.

Material and process characteristics

Composite structure design

Surface carbon cloth reinforcement: through a special process to carbon fiber felt and high-density carbon cloth composite, the surface to form a dense protective layer, effectively prevent high temperature air wash and fiber shedding, reduce the release of impurities.

Multi-layer integration process: the core layer is carbon fiber felt, and the graphite paper or carbon cloth is embedded in the middle. After secondary high temperature purification (≥2000℃), the material structure is densified and the impurities are deeply removed.

Ultra-low impurity purity

Ash content ≤10ppm, ensure that there is no metal ions, SiO₂ and other impurities volatilization in high temperature environment, avoid polluting the crystal growth interface, improve the purity of silicon carbide single crystal and defect control level 19.

Process adaptability

Customized surface treatments (such as graphite foil coating, antioxidant coating), suitable for vacuum or inert gas (Ar, N₂) environment, operating temperatures covering 1200 ° C to 3000 ° C.

Core performance parameter

Application fields and advantages

Silicon carbide single crystal furnace hot field insulation

As the core material of the furnace insulation layer, it can reduce heat loss, maintain the growth interface temperature gradient (ΔT≈20-50℃/cm), and ensure that the axial/radial growth rate of crystals is balanced.

Used with soft felt to form a gradient insulation structure, reduce thermal stress and extend the life of the thermal field.

Competitive advantage

Thermal stability: low coefficient of thermal expansion (CTE < 2×10⁻⁶/℃), excellent thermal shock resistance, suitable for repeated rising and cooling conditions.

Economy: Compared with traditional soft felt, the service life is increased by 3-5 times, reducing the frequency of hot field replacement and production costs.

Customization: Support cylinder, plate and other forms of processing, dimensional accuracy up to ±0.5mm, suitable for different furnace design.

Typical application case

Vacuum high pressure gas quenching furnace: as a heat shield, reduce energy consumption by more than 20%

Large size SiC crystal growth: For 8-inch crystal furnaces, thermal field uniformity deviation < 1.5%