Densification during the formation of WC-based coating prepared by electric contact strengthening. Issue 12 (15th June 2021)

• Record Type: Journal Article
• Authors: Sun, Ze; Zhu, Shigen; Dong, Weiwei; Ding, Hao; Bai, Yunfeng; Luo, Yilan; Di, Ping
• Is Part Of: Ceramics international. Volume 47:Issue 12(2021)
• Page Start: 16441
• Page End: 16449
• Publication Date: 2021-06-15
• Subjects: WC-Based coating -- Electric contact strengthening -- Heating-pressing action -- Densification mechanism -- Intensified capillarity; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.01.122
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this study, the densification during the formation of WC-based coating prepared by electric contact strengthening (ECS) was investigated. Under increasing ECS process unit time, the surface and cross-sectional morphology, element distribution, hardness and phase composition of WC-based coating were detected. And the wear tests were conducted to test the coating performance. The results showed that, with the prolongation of ECS time, the coatings became denser while the porosity ratio decreased from 10.14% to 1.05%; The hardness of the coatings increased and the worn loss decreased continuously. It was found that, by the heating-pressing action of ECS, the WC-based powder geometry could maintain the original sphere shape, while the pores were filled gradually. The A4 coating showed the lowest wear rate. The densification mechanism was deduced that the intensified capillarity at the interface between the hard phase and binder phase due to the heating-pressing action, which showed forced infiltration and creeping behavior of the binding phase.