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Preparation and mechanisms of cemented carbides with ultrahigh fracture strength
Author(s) -
Liu Xingwei,
Song Xiaoyan,
Wang Haibin,
Liu Xuemei,
Wang Xilong,
Guo Guangsheng
Publication year - 2015
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s1600576715012832
Subject(s) - materials science , carbide , microstructure , cemented carbide , particle size , carbon fibers , microscale chemistry , sintering , phase (matter) , grain size , particle (ecology) , composite number , composite material , grain boundary , metallurgy , chemical engineering , chemistry , mathematics education , mathematics , organic chemistry , engineering , geology , oceanography
WC–Co cemented carbides were prepared by liquid‐state sintering of in situ synthesized composite powders with a constant Co content but different carbon concentrations, and with different size scales of VC particles as grain‐growth inhibitor. With an optimized carbon addition and doping with microscale VC particles, an ultrahigh fracture strength with a mean value above 5000 MPa was achieved for cemented carbides. By detailed crystallographic analysis of the configuration and interactions of the WC, Co and VC phases, the effects of VC particle size on the microstructure and mechanical properties of cemented carbides are identified. The mechanisms by which the fracture strength depends on the VC particle size contain the effects on the changes in Co binder distribution, atomic matching at the phase boundary and WC grain size. The dominant factors for ultrahigh fracture strength of cemented carbides are proposed.