Dual-layer Design of TaC Coatings on Graphite by Laser Chemical Vapor Deposition for Improving the Thermal Shock Resistance

Abstract

A dual-layer TaC coating including porous TaC (p-TaC) inner layer and dense TaC (d-TaC) outer layer was in-situ fabricated by laser chemical vapor deposition (LCVD) for improving the thermal shock resistance. The p-TaC inner layer exhibits a (111) preferred orientation and characterizes a network of trunks and branches attributed to the “shadow effect”, while the d-TaC outer layer displays a random orientation with a columnar crystal structure. This dual-layer design effectively mitigates CTE mismatch and alleviates thermal stress. Consequently, the coated graphite can withstand more than 10 cycles of thermal shock test from room temperature (RT) to 1 400 °C with no stress cracking. This work provides a novel strategy for fabricating functional coatings on graphite with excellent thermal shock resistance.

Keywords

laser chemical vapor deposition (LCVD) / TaC coatings / thermal shock resistance / microstructure / carbon materials

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Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature