Mechanical Property Evaluation of WC-Co-B4C Hard Materials by a Spark Plasma Sintering Process

Jeong-Han Lee; Hyun-Kuk Park

doi:10.3740/MRSK.2021.31.7.397

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2021 Vol.31, Issue 7 Preview Page Next Page

Mechanical Property Evaluation of WC-Co-B₄C Hard Materials by a Spark Plasma Sintering Process 방전플라즈마 소결 공정을 이용한 WC-Co-B₄C 소재의 기계적 특성평가

July 2021. pp. 397-402

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Abstract

In this study, binderless-WC, WC-6 wt%Co, WC-6wt% 1 and 2.5 B₄C materials are fabricated by spark plasma sintering process (SPS process). Each fabricated WC material is almost completely dense, with a relative density up to 99.5 % after the simultaneous application of pressure of 60 MPa. The WC added Co and Co-B₄C materials resulted in crystalline growth. The WC with HCP crystal structure has respective interfacial energy (basal facet direction: 1.07 ~ 1.34 J·m⁻², prismatic direction: 1.43 ~ 3.02 J·m⁻²) that depends on the grain growth direction. It is confirmed that the continuous grain growth, biased by the basal facet, which has relatively low energy, is promoted at the WC/Co interface. As abnormal grain growth takes place, the grain size increases more than twice from 0.37 to 0.8 um. It is found through analysis that the hardness property also greatly decreases from about 2661.4 to 1721.4 kg/mm2, along with the grain growth.

Keywords

spark plasma sintering process

WC-Co-B₄C

binderless-WC

hardness

fracture toughness

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 31
No :7
Pages :397-402
Received Date : 2021-05-17
Revised Date : 2021-06-21
Accepted Date : 2021-06-21
DOI :https://doi.org/10.3740/MRSK.2021.31.7.397

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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