Effect of Mn addition on the microstructure, interface structure and mechanical properties of MoCoB–Co cermets prepared by in-situ synthesis. Issue 10 (15th May 2023)

• Record Type: Journal Article
• Authors: Yang, Guoqiang; Zhang, Jianyu; Chen, Yayu; Zeng, Hongtao; Zhao, Leijie; Wang, Yanhui; Yin, Haiqing
• Is Part Of: Ceramics international. Volume 49:Issue 10(2023)
• Page Start: 16477
• Page End: 16485
• Publication Date: 2023-05-15
• Subjects: MoCoB -- Cermet -- In-situ synthesis -- Interface -- Mechanical properties; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2023.02.009
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: MoCoB–Co cermets with different Mn contents were synthesized using an in-situ sintering reaction, and the effect of Mn addition on the microstructure, interfaces, and mechanical properties was investigated. The addition of Mn inhibited the transition of the binder phase from fcc to hcp. Adding an appropriate Mn can increase the density of the material and refine the hard phase grain. With increasing Mn content, the hardness decreased marginally and then gradually increased, and the transverse rupture strength (TRS) and fracture toughness ( K IC ) gradually decreased. The cermet with 6 wt% Mn addition had the smallest grain size and lower porosity. The hardness of the cermet increased from HRA 89.0 to HRA 91.7. The interface bonding strength of MoCoB/hcp-Co is higher than that of MoCoB/fcc-Co. After isothermal aging treatment, the content of hcp-Co in the binder phase increased markedly; thus, the K IC and TRS increased from 11.3 MPa m 1/2 and 1200 MPa–13.3 MPa m 1/2 and 1750 MPa, respectively.