Preparation of Si3N4 Porous Ceramics via Combined Foam-gelcasting and Catalytic Nitridation with Fe Powder as Catalyst  

作　　者：HAN Lei ZHANG Haijun ZHANG Shaowei 

机构地区：[1]The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China [2]College of Engineering,Mathematics and Physical Sciences,University of Exeter,Exeter EX44QF,UK

出　　处：《China's Refractories》2020年第3期1-6,共6页中国耐火材料（英文版）

基　　金：National Natural Science Foundation of China(Grant No.51672194 and 51872210);Program for Innovative Teams of Outstanding Young and Middle-aged Researchers in the Higher Education Institutions of Hubei Province(T201602);Key Program of Natural Science Foundation of Hubei Province,China(Contract No.2017CFA004);the China Scholarship Council(CSC)(No.201808420278).

摘　　要：Si3N4 porous ceramics were fabricated by a combined foam-gelcasting and catalytic nitridation method at 1473-1623 K using silicon powder as the starting material,hexadecyl trimethyl ammonium bromide(CTAB)as the foaming agent,and different amounts of micron Fe powder as the catalyst.The effects of the nitridation temperature and the Fe powder addition on the phase composition,the mechanical properties,and the microstructure of the samples were researched.The results show that when nitriding at 1573 K for 5 h and adding 1 mass%Fe powder(with respect to the Si powder),the sample has a high porosity and suitable mechanical properties:the porosity of 76.5%,the compressive strength of 16.2 MPa,and the specific strength of 22.7 MPa•cm3•g^-1.

关 键 词：silicon nitride porous ceramics foam-gelcasting catalytic nitridation 

分 类 号：TQ174.1[化学工程—陶瓷工业]