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<p>A dual-layer TaC coating including porous TaC (<i>p</i>-TaC) inner layer and dense TaC (<i>d</i>-TaC) outer layer was in-situ fabricated by laser chemical vapor deposition (LCVD) for improving the thermal shock resistance. The <i>p</i>-TaC inner layer exhibits a (111) preferred orientation and characterizes a network of trunks and branches attributed to the “shadow effect”, while the <i>d</i>-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.</p>

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

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • Yeqin Shen,
  • Song Zhang,
  • Wei Huang,
  • Chitengfei Zhang,
  • Chongjie Wang,
  • Han Guo,
  • Cuicui Li,
  • Meijun Yang,
  • Rong Tu

摘要

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.