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Gas Pressure Sintering of Arbitrary Porous Silicon Nitride Ceramics with High Mechanical Strength

Gas pressure sintering is applied to prepare arbitrary porous silicon nitride (Si3N4) ceramics using yttria (Y2O3) as the sintering additive and naphthalene powder as the pore-forming agent. The results obtained show that the porosity of the sintered porous Si3N4 ceramics is 40%[ndash]54% when the Y2O3 content is from 3 to 15 wt% and the sintering temperature is from 1700° to 1850°C. The bending strength is in the range of 60[ndash]226 MPa. The porosity of the porous Si3N4 ceramics with Y2O3 content of 9 wt%, sintered at 1800°C, is increased to 51%[ndash]66% when the naphthalene powder content is 5[ndash]30 wt%. Finally, large and arbitrary porous Si3N4 ceramics with a porosity of [sim]60% can be successfully fabricated by this method.

Authors:   Li, Yong; Chen, Fei; Li, Ling; Zhang, Weiru; Yu, Honglin; Shan, Yubo; Shen, Qiang; Jiang, Hongyi
Journal:   Journal of the American Ceramic Society
Volume:   93
edition:   6
Year:   2010
Pages:   1565
DOI:   10.1111/j.1551-2916.2010.03603.x
Publication date:   01-Jun-2010
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