Effect of the starting AlN content on the phase formation and property of the novel in-situ fabricated X-SiAlON/BN composites. Issue 4 (April 2019)

• Record Type: Journal Article
• Authors: Li, Quan; Yang, Zhihua; Zhong, Jing; Sun, Yangshan; Jia, Dechang; Duan, Xiaoming; Zhou, Yu
• Is Part Of: Journal of the European Ceramic Society. Volume 39:Issue 4(2019)
• Page Start: 934
• Page End: 943
• Publication Date: 2019-04
• Subjects: Mechanically alloyed -- Hot-press -- X-SiAlON/BN composites -- Thermal conductivity; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2018.12.035
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Novel in-situ X -SiAlON reinforced BN composites were first fabricated via the procedure of mechanical alloying plus hot press sintering. The effects of the starting AlN content (0∼25 vol%) on phase formation, evolution and microstructure were carefully investigated. XRD results indicated that AlN content was the crucial factor in the phase composition and evolution in the composites, for instance, excess AlN leading to the transformation from X -SiAlON to β -SiAlON. The relationships of AlN content with mechanical, thermal and dielectric properties of the composites were also involved in this study. The composite with the 15 vol% AlN, mainly consisting of X -SiAlON and BN, exhibited the best mechanical properties (flexural and fracture strength were 337.5 MPa and 4.15 MPa.m 1/2, respectively), low thermal conductivity as well as the excellent dielectric properties (ε < 5.71), which enabled it to be a promising candidate for the application of high-temperature structural/ functional materials.