High-pressure synthesis and performance analysis of WC-cBN-MoS2 self-lubricating ceramic composites. (January 2023)

• Record Type: Journal Article
• Authors: Wu, Jiakun; Wang, Haikuo; Zhang, Zhicai; Wang, Chao; Hou, Zhiqiang; Wan, Shun; Wu, Dazhuan; Ouyang, Xiaoping
• Is Part Of: International journal of refractory metals & hard materials. Volume 110(2023)
• Publication Date: 2023-01
• Subjects: High pressure high temperature -- Tungsten carbide -- Cubic boron nitride -- Self-lubrication -- MoS2; Heat resistant alloys -- Periodicals; Refractory materials -- Periodicals; Metallography -- Periodicals; Alliages réfractaires -- Périodiques; Matériaux réfractaires -- Périodiques; Métallographie -- Périodiques; Heat resistant alloys; Metallography; Refractory materials; Periodicals; Electronic journals; 669.73
• DOI: 10.1016/j.ijrmhm.2022.105989
• Languages: English
• ISSNs: 0263-4368

Abstract

Abstract: WC-cBN-MoS2 self-lubricating ceramics were synthesized by using high pressure and high temperature sintering method. An analytical model of the self-lubricating properties has been developed to reveal the interrelationship between mechanical and self-lubricating properties. The influence of mechanical and self-lubricating properties of ceramics on the wear rate were analyzed. Self-lubricating performance optimization criterion are proposed accordingly. It was found that MoC, WS2 can be formed during sintering, which can ensure self-lubricating and low temperature sintering properties. Adhesive wear is the main wear mechanism, the extent of which varies with the content of self-lubricating components. The high modulus of elasticity is the main reason for the excellent self-lubricating and mechanical properties of composites. The well-sintered WC-cBN-MoS2 bulks present an excellent self-lubricating property with a hardness of 26.3 GPa and fracture toughness of 10.5 MPa·m 1/2, which is improved at least by 52% and 46% respectively compared with the traditional self-lubricating ceramics. Highlights: WC-cBN-MoS2 self-lubricating ceramics were synthesized by high-pressure method with excellent mechanical properties. The analytical model of self-lubricating performance considering the thickness of lubricating film is established. The MoC and WS2 produced by the reaction of WC with MoS2 can be used as a binder and a new lubricating component.