Preparation,structure and mechanical properties of Sialon ceramics by transition metal-catalyzed nitriding reaction  

作　　者：Qing-Ming Xiong Zhi Chen Jun-Tong Huang Meng Zhang Hui Song Xi-Feng Hou Xi-Bao Li Zhi-Jun Feng 

机构地区：[1]School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China [2]Tianjin Boya Dadi New Material Technology Ltd.,Tianjin 300382,China

出　　处：《Rare Metals》2020年第5期589-596,共8页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51772140 and 51862024);the Natural Science Foundation of Jiangxi Province(No.20171ACB21033);the Science and Technology Project of the Education Department of Jiangxi Province(No.GJJ170573);the Graduate Innovation Special Fund of Nanchang Hangkong University(No.YC2018-S358)。

摘　　要：Sialon ceramics were prepared by the nitridation of Si,Al and Al2O3 powders with the transition metals(Fe Co,Ni)catalysts.The phase composition,microstructure and mechanical properties of specimens were studied Compared with the catalyst-free specimen,the addition of Fe,Co and Ni greatly promoted the nitridation process of Sialon ceramics and improved the weight gain rate and mechanical properties of specimens.With the increased content of catalysts,the apparent porosity of the products decreased first and then increased,contrary to flexural strength and compressive strength.The specimen with 2.5 wt%Fe had the highest flexural strength 145.8 MPa and it exhibited the highest compressive strength of 594.6 MPa when Co content was 2.5 wt%,whereas they were 71.9 and 78.7 MPa,respectively,when without catalyst.

关 键 词：Transition metal SIALON Whiskers or fibers Nitridation reaction Flexural strength Compression resistance 

分 类 号：TQ174.1[化学工程—陶瓷工业]