Microstructure and mechanical properties of h-BN–SiC ceramic composites prepared by in situ combustion synthesis

Autor:	Yongting Zheng, Hongbo Li, Zhou Tongjin
Rok vydání:	2012
Předmět:	In situ Materials science Mechanical Engineering Condensed Matter Physics Microstructure Fracture toughness Flexural strength Mechanics of Materials visual_art High nitrogen visual_art.visual_art_medium Relative density General Materials Science Ceramic Composite material Combustion front
Zdroj:	Materials Science and Engineering: A. 540:102-106
ISSN:	0921-5093
DOI:	10.1016/j.msea.2012.01.105
Popis:	h-BN–SiC ceramic composites were prepared by in situ combustion synthesis of B4C and Si powder compacts under high nitrogen pressure. The high reaction nitrogen pressure was beneficial to the improvement of the relative density and mechanical properties of the products, but higher nitrogen pressure of 120 MPa was favorable to the formation of Si3N4, which was consistent with the theoretical thermodynamic calculation. The h-BN–SiC ceramic composites have good mechanical properties over those of conventionally processed ones because of the in situ formed h-BN and SiC phases fabricated under high temperature and pressure. The bending strength and fracture toughness of the h-BN–SiC ceramic composites prepared under 100 MPa nitrogen pressure were 82 MPa and 1.9 MPa m1/2, respectively.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::507e22c7fd1b71cb0cbf684850b59eb5 https://doi.org/10.1016/j.msea.2012.01.105 Zobrazit plný text záznamu Full Text from ScienceDirect