Effect of SiC nanowhisker addition on microstructure and mechanical properties of regenerated cemented carbides by low‐pressure sintering

The hardness and toughness of regenerated cemented carbides, in general, are contradictory. Therefore, it is critical to explore regenerated cemented carbides with both high hardness and high toughness. In this study, regenerated WC‐8‐wt% Co cemented carbide with SiC nanowhisker were prepared by low...

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Bibliographic Details
Published in:International journal of applied ceramic technology 2021-07, Vol.18 (4), p.1222-1234
Main Authors: Hu, Dongmei, Du, Jin, Su, Guosheng, Lu, Zhenyun, Zhang, Chongyan, Kong, Xiangmin, Xu, Chonghai
Format: Article
Language:English
Subjects:
Cemented carbides
Coefficient of friction
Density
Diamond pyramid hardness
Flexural strength
Fracture mechanics
Fracture surfaces
Fracture toughness
friction coefficient
Hot pressing
Intergranular fracture
Mechanical properties
Microstructure
regenerated cemented carbide
SiC nanowhisker
Silicon carbide
Tungsten carbide
Wear resistance
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Summary:The hardness and toughness of regenerated cemented carbides, in general, are contradictory. Therefore, it is critical to explore regenerated cemented carbides with both high hardness and high toughness. In this study, regenerated WC‐8‐wt% Co cemented carbide with SiC nanowhisker were prepared by low‐pressure sintering. The influence of SiCw contents on the microstructure and mechanical properties of regenerated WC‐8‐wt% Co cemented carbide was investigated. The results indicated that the hardness, density, flexural strength, and fracture toughness of regenerated cemented carbide first increased and then decreased with the addition of SiCw. The Vickers hardness, density, flexural strength, and fracture toughness could reach 1575 HV, 14.6 g/cm3, 2204 MPa, 16.85 MPa·m1/2, respectively, with SiCw content 0.5 wt%, which were increased by 14.4%, 0.7%, 12.2%, and 17.3%, respectively, when compared with the regenerated cemented carbide without SiCw. The lowest friction coefficient and the best wear resistance could be also reached when 0.5‐wt% SiCw was added. The fracture mechanism of the regenerated cemented carbide contained both transgranular and intergranular fracture through the microscopic observation of fracture surface via scanning electron microscope.
ISSN:1546-542X
1744-7402
DOI:10.1111/ijac.13748