基于凝胶分子造孔机理,通过提高凝胶注模工艺中有机单体含量,制备微多孔氮化硅陶瓷,研究了烧结温度对Si3N4微多孔陶瓷烧结体的显微结构、强度、气孔率、孔径等方面的影响.结果表明,温度升高有利于β-Si3N4晶相的生成,烧结温度为1 680℃时,氮化硅陶瓷烧结体中α-Si3N4和β-Si3N4并存,当烧结温度为1 730和1 780℃时,氮化硅陶瓷烧结体的晶相全部为β-Si3N4;陶瓷烧结体的孔径均<1μm,而且孔径分布范围较窄、较均匀;随着烧结温度的提高,陶瓷烧结体的强度单调上升而气孔率下降.
参考文献
[1] | Riley F.L.;, .Silicon Nitride and Related Materials[J].Journal of the American Ceramic Society,2000(2):245-265. |
[2] | Jian-Feng Yang;Tatsuki Ohji;Shuzo Kanzaki .Microstructure and Mechanical Properties of Silicon Nitride Ceramics with Controlled Porosity[J].Journal of the American Ceramic Society,2002(6):1512-1516. |
[3] | Mori H.;Yoshimura N.;Hotta T.;Ayama K.;Tsubaki JI.;Mase S. .Fabrication of supported Si3N4 membranes using the pyrolysis of liquid polysilazane precursor[J].Journal of Membrane Science,1998(1):23-33. |
[4] | Ma J T;Xie Z P;Miao H Z et al.Gelcasting of alumina ceramics in the mixed acrylamide and polyacrylamide systems[J].Journal of the European Ceramic Society,2003,23(07):2 273. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%