한국재료학회지 (Korean Journal of Materials Research)

  • 제30권6호
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  • Pages.321-325
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  • 2020
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  • 1225-0562(pISSN)
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  • 2287-7258(eISSN)
한국재료학회 (Materials Research Society of Korea)
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자기펄스 성형 및 방전 플라즈마 소결 공정으로 제조한 텅스텐 소결체의 특성

Fabrication and Properties of Densified Tungsten by Magnetic Pulse Compaction and Spark Plasma Sintering

  • 이의선 (서울과학기술대학교 신소재공학과) ;
  • 변종민 (서울과학기술대학교 신소재공학과) ;
  • 정영근 (부산대학교 융합학부) ;
  • 오승탁 (서울과학기술대학교 신소재공학과)
  • Lee, Eui Seon (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Byun, Jongmin (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Jeong, Young-Keun (Graduate School of Convergence Science, Pusan National University) ;
  • Oh, Sung-Tag (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
  • 투고 : 2020.05.29
  • 심사 : 2020.06.12
  • 발행 : 2020.06.27
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초록

The present study demonstrates the effect of magnetic pulse compaction and spark plasma sintering on the microstructure and mechanical property of a sintered W body. The relative density of green specimens prepared by magnetic pulse compaction increases with increase in applied pressure, but when the applied pressure is 3.4 GPa or more, some cracks in the specimen are observed. The pressureless-sintered W shows neck growth between W particles, but there are still many pores. The sintered body fabricated by spark plasma sintering exhibits a relative density of above 90 %, and the specimen sintered at 1,600 ℃ after magnetic pulse compaction shows the highest density, with a relative density of 93.6 %. Compared to the specimen for which the W powder is directly sintered, the specimen sintered after magnetic pulse compaction shows a smaller crystal grain size, which is explained by the reduced W particle size and microstructure homogenization during the magnetic pulse compaction process. Sintering at 1,600 ℃ led to the largest Vickers hardness value, but the value is slightly lower than that of the conventional W sintered body, which is attributed mainly to the increased grain size and low sintering density.

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