Rigid Graphite Felt

The Semixlab Rigid Graphite Felt (RGF) is engineered as a critical high-temperature insulation and thermal management component for the Physical Vapor Transport (PVT) growth of SiC single crystals. Designed for use in next-generation 4H- and 6H-SiC wafer production, this rigid felt combines ultra-low thermal conductivity, high structural integrity, and exceptional chemical purity, making it a cornerstone material in high-performance SiC sublimation furnaces. Its application ensures precise control of thermal gradients, stable growth conditions, and enhanced crystal quality across long-duration production cycles.

In the SiC PVT process, maintaining a consistent and uniform thermal field is paramount to achieving defect-free single crystals. The Graphite Rigid Felt serves as the primary furnace insulation, surrounding the sublimation crucible and thermal field structures. Its low thermal conductivity reduces unwanted heat loss, maintaining the target temperature gradient between the SiC source and seed crystal. By controlling radial and axial temperature profiles, the RGF minimizes the formation of basal plane dislocations, stacking faults, and micropipes, directly impacting the structural integrity and electronic performance of the resulting SiC wafers.

Beyond its thermal insulation capabilities, the rigid structure of Semixlab’s graphite felt provides mechanical stability in high-temperature environments exceeding 2000°C. Unlike flexible or soft felts, RGF maintains its shape under prolonged thermal cycling, preventing collapse or deformation that could disturb the thermal field or compromise furnace lifetime. Its chemical inertness ensures minimal particulate release and avoids contamination of the SiC boule, which is critical for producing high-resistivity substrates for power electronics and wide-bandgap device applications.

Manufactured using high-purity graphitic carbon and advanced densification techniques, Semixlab Graphite Rigid Felt exhibits uniform density, excellent dimensional stability, and long-term durability. Its combination of thermal performance and mechanical rigidity enables semiconductor fabs to achieve consistent growth rates, reproducible temperature profiles, and reduced downtime in PVT systems. By optimizing furnace thermal efficiency, RGF also contributes to energy savings while enhancing wafer uniformity and yield.

Semixlab’s Rigid Graphite Felt offers the performance, purity, and structural stability required to support high-quality SiC single crystal growth, providing manufacturers with a robust material solution for next-generation wafer production, extended furnace life, and superior thermal management in extreme high-temperature environments.