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

doi:10.19691/j.cnki.1004-4493.2020.03.001

China's Refractories ›› 2020, Vol. 29 ›› Issue (3): 1-6.DOI: 10.19691/j.cnki.1004-4493.2020.03.001

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

Lei HAN¹^,², Haijun ZHANG¹^,^*(), Shaowei ZHANG²

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 EX4 4QF, UK

Online:2020-09-15 Published:2020-09-15
Contact: Haijun ZHANG
About author:Han Lei, born in 1987 in Hennan Provence, received his bachelor’s degree from Luoyang Institute of Science and Technology in 2014, majoring in inorganic non-metal material science and engineering. Then, he graduated from the State Key Laboratory of Refractory Metallurgy, Wuhan University of Science and Technology in 2017 and 2020 respectively with a master’s degree and a doctorate, majoring in materials science and engineering. His research field is high-performance ceramics and refractories.

Abstract

Abstract:

Si₃N₄ porous ceramics were fabricated by a combined foam-gelcasting and catalytic nitridation method at 1 473-1 623 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 1 573 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.

Key words: silicon nitride, porous ceramics, foam-gelcasting, catalytic nitridation

Lei HAN, Haijun ZHANG, Shaowei ZHANG. Preparation of Si₃N₄ Porous Ceramics via Combined Foam-gelcasting and Catalytic Nitridation with Fe Powder as Catalyst[J]. China's Refractories, 2020, 29(3): 1-6.

Figures/Tables 7

Fig. 1 XRD patterns of Si3N4 porous ceramics prepared at various nitridation temperatures

Fig. 2 SEM images and EDS patterns of Si3N4 porous ceramics prepared at various nitridation temperatures

Fig. 3 TEM, EDS, HRTEM, and SAED results of Si3N4 whiskers in Si3N4 porous ceramics prepared at 1 573 K for 5 h

Fig. 4 Effects of nitridation temperature on porosity, bulk density, compressive strength, and specific strength of Si3N4 porous ceramics 3.2 Effect of Catalyst Addition

Fig. 5 XRD patterns of porous ceramics obtained at 1 573 K for 5 h with various additions of Fe powder

Fig. 6 SEM images and EDS patterns of Si3N4 porous ceramics prepared at 1 573 K for 5 h with various additions of Fe powder

Fig. 7 Porosity, bulk density, compressive strength, and specific strength of Si3N4 porous ceramics prepared at 1 573 K for 5 h with various additions of Fe powder

References 15

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

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