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For industrial-scale production of silicon carbide substrates, the success of a single growth run is not the end goal. The real challenge lies in ensuring that crystals grown across different batches, tools, and time periods maintain a high level of consistency and repeatability in quality. In this context, the role of tantalum carbide (TaC) coating goes beyond basic protection—it becomes a key factor in stabilizing the process window and safeguarding product yield.

​Silicon carbide (SiC) PVT growth involves severe thermal cycling (room temperature above 2200 ℃). The enormous thermal stress generated between the coating and the graphite substrate due to the mismatch in coefficients of thermal expansion (CTE) is the core challenge determining coating lifetime and application reliability.

​In the silicon carbide (SiC) PVT crystal growth process, the stability and uniformity of the thermal field directly determine the crystal growth rate, defect density, and material uniformity. As the system boundary, thermal-field components exhibit surface thermophysical properties whose slight fluctuations are dramatically amplified under high-temperature conditions, ultimately leading to instability at the growth interface.