MAS-content dependence of the texture and fracture behavior of h-BN-MAS composite ceramics. Issue 15 (15th October 2019)

• Record Type: Journal Article
• Authors: Niu, Bo; Yang, Zhihua; Cai, Delong; Duan, Wenjiu; Duan, Xiaoming; Li, Qian; Li, Hailiang; Sun, Yangshan; Jia, Dechang; Zhou, Yu
• Is Part Of: Ceramics international. Volume 45:Issue 15(2019)
• Page Start: 18536
• Page End: 18542
• Publication Date: 2019-10-15
• Subjects: h-BN -- Textured ceramics -- Densification -- R-curve behavior -- Fracture behavior; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.06.073
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Texturing was employed to tailor the mechanical properties of h -BN ceramic with MAS as liquid texturing aid. Effects of MAS content on the texture behavior, densification behavior, bending strength, fracture toughness and the fracture behavior of the h -BN ceramics were studied. Moderate MAS of 30 wt% can significantly facilitate the orientation of h -BN grains in the direction perpendicular to the hot-pressing direction. MAS is also in favor of the densification behavior of h -BN as sintering aid. In-situ mechanical testing shows that texturing can greatly improve the mechanical properties and avoid the catastrophic fracture of the h -BN ceramics, and the textured h -BN ceramics exhibit distinct rising R -curve behavior, which is primarily attributed to the effect of parallel-aligned h -BN grains to the crack propagation under loading.