Strengthening and toughening mechanism of (W, Ti, Ta)C based cermet with the addition of c-BN@Al2O3. Issue 22 (15th November 2021)

• Record Type: Journal Article
• Authors: Yi, Mingdong; Jing, Guiqiang; Li, Depeng; Xiao, Guangchun; Chen, Zhaoqiang; Zhang, Jingjie; Wang, Li; Xu, Chonghai
• Is Part Of: Ceramics international. Volume 47:Issue 22(2021)
• Page Start: 32075
• Page End: 32085
• Publication Date: 2021-11-15
• Subjects: Cermet -- Core-shell particles -- Microstructure -- Residual stress -- Strengthening and toughening; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.08.097
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Core-shell particles are considered to be one of the primary strengthening and toughening methods of cermet. In this study, a (W, Ti, Ta)C based cermet was prepared by vacuum hot pressing sintering technology with the addition of c-BN@Al2 O3 (Al2 O3 coated c-BN). Localized high residual stress around the core-shell particles causes the strengthening and toughening mechanism at short distances behind the crack tip, such as crack deflection, secondary cracks, crack branching, and grain pull-out, even at a small volume fraction of 10 vol%. Compared with cermet without Al2 O3 and c-BN, the flexural strength and fracture toughness of the cermet with 10 vol% c-BN@Al2 O3 are increased by 35.62% and 28.45%, reaching 1462 ± 49 MPa and 13.68 ± 0.51 MPa m 1/2, respectively.