열처리공학회지 (Journal of the Korean Society for Heat Treatment)

  • 제36권4호
  • /
  • Pages.206-214
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  • 2023
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  • 1225-1070(pISSN)
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  • 2508-4046(eISSN)
한국열처리공학회 (The Korean Society for Heat Treatment)
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초미립 WC-Graphene-Al2O3 복합재료 소결 및 기계적 성질

Mechanical Properties and Sintering of Ultra Fine WC-Graphene-Al Composites

  • 손인진 (전북대학교 신소재공학부)
  • In-Jin Shon (Division of Advanced Materials Engineering, Jeonbuk University)
  • 투고 : 2023.06.09
  • 심사 : 2023.07.03
  • 발행 : 2023.07.30
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초록

Tungsten carbide has many industrial applications due to its high electrical and thermal conductivity, high melting temperature, high hardness and good chemical stability. Because tungsten carbide is difficult to sinter, it is sintered with nickel or cobalt as a binder and is currently used in nozzles, cutting tools, and molds. Alumina is reported to be a viable binder for tungsten carbide due to its higher oxidation resistance and lower cost than nickel and cobalt. The ultrafine tungsten carbide-graphene-alumina composites were rapidly sintered in a high frequency induction heating active sintering unit. The microstructure and mechanical properties (fracture toughness and hardness) of the composites were investigated and analyzed by Vickers hardness tester and electron microscope. Since the high-frequency induction heating sintering method enables high-speed sintering, ultrafine composites can be prepared by preventing grain growth. In the tungsten carbide-graphene-alumina composites, the grain size of tungsten carbide increased with the amount of alumina participation. The hardness and fracture toughness of the tungsten carbide-5% graphene- x% alumina (x = 0, 5, 10,15) composites were 5.1, 8.6, 8.6, and 8.4 MPa-m1/2 and 2384, 2168, 2165, and 2102 kg/mm2, respectively. The fracture toughness increased without a significant decrease in hardness. Sinterability was improved by adding alumina to tungsten carbide-graphene.

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