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Preparation of Si3N4 Porous Ceramics via Combined Foam-gelcasting and Catalytic Nitridation with Fe Powder as Catalyst 被引量:1
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作者 HAN Lei ZHANG Haijun ZHANG Shaowei 《China's Refractories》 CAS 2020年第3期1-6,共6页
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 foamin... 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. 展开更多
关键词 silicon nitride porous ceramics foam-gelcasting catalytic nitridation
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