Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
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Thermal/Mechanical Properties of Hafnium Carbide Coatings on Carbon-Carbon Composites

탄소-탄소 복합재료의 하프늄 탄화물 코팅재의 열적/기계적 특성

  • Received : 2018.07.18
  • Accepted : 2018.08.30
  • Published : 2018.10.31
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Abstract

This study investigates thermal and mechanical characterization of Hafnium carbide coating on the $C_f-C$ composites. The hafnium carbide coatings by vacuum plasma spray on the C/C-SiC composites are prepared to evaluate oxidation and wear resistance. We perform the thermal durability tests by thermal cycling at $1200^{\circ}C$ for 10cycles in air and investigates the weight change of each cycle. We also evaluate the wear and indentation behavior using tungsten carbide ball indenter as a mechanical evaluation. As a result, the HfC coating is beneficial to reduce of weight loss during thermal cycling test and improve the elastic property of C/C-SiC composite. Especially, the HfC coating improves the wear resistance of C/C-SiC composite.

본 논문에서는 C/C-SiC 복합재료의 하프늄 탄화물 코팅재에 대한 열적, 기계적 특성을 평가하였으며 특히 코팅에 의한 내산화성과 내마모성의 향상여부를 평가하였다. 하프늄 탄화물(HfC)을 용사시켜 코팅한 샘플들을 가공한 후, 공기 중에서 열적 특성평가 및 마모, 압입시험 평가에 대한 연구를 수행하였다. 공기 중에서 $1200^{\circ}C$의 온도까지 승온시킨 후 1시간 유지하는 싸이클을 10싸이클 진행하여 각 싸이클마다의 무게변화를 통해 탄소의 산화저항성을 평가하였고, 초경 구(tungsten carbide)를 사용하여 마모시험과 압입시험을 수행하여 그 결과를 비교하였다. 열피로 시험 수행 결과 하프늄 탄화물 코팅재가 상대적으로 무게감소가 적어 상대적으로 내산화성이 높은 것으로 평가되었다. 코팅된 하프늄 탄화물에 의해 탄성계수가 상대적으로 증가하였으며, 또한 C/C-SiC 복합재료는 하프늄 탄화물의 코팅에 의하여 내마모성이 향상되어 동일조건에서 마모량이 상대적으로 적었고 낮고 안정된 마찰계수가 유지되었다.

Keywords

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