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Effect of SiC nanowhisker addition on microstructure and mechanical properties of regenerated cemented carbides by low‐pressure sintering
Author(s) -
Hu Dongmei,
Du Jin,
Su Guosheng,
Lu Zhenyun,
Zhang Chongyan,
Kong Xiangmin,
Xu Chonghai
Publication year - 2021
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13748
Subject(s) - materials science , microstructure , cemented carbide , fracture toughness , flexural strength , sintering , vickers hardness test , transgranular fracture , scanning electron microscope , carbide , composite material , metallurgy , intergranular fracture , intergranular corrosion
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/cm 3 , 2204 MPa, 16.85 MPa·m 1/2 , 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.