Effect of solid content on pore structure and mechanical properties of porous silicon nitride ceramics produced by freeze casting
Effect of solid content on pore structure and mechanical properties of porous silicon nitride ceramics produced by freeze casting
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DOI：
10.1016/j.msea.2010.10.066
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发表时间：
2011-01
期刊：
影响因子：
6.4
通讯作者：
F. Ye;Jing-yi Zhang;Limeng Liu;Haijiao Zhan
中科院分区：
文献类型：
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作者：
F. Ye;Jing-yi Zhang;Limeng Liu;Haijiao Zhan
以液氮为制冷剂，采用冷冻铸造法制备了Si 3 N4多孔陶瓷。浆料固含量对材料的孔结构、孔隙率、α→β-Si 3 N4相变和力学性能有显著影响。随着固含量的增加，孔隙率降低，孔径减小，孔结构由枝晶排列的孔道变为孔径减小的圆孔。这种圆孔的形成阻碍了α→β-Si 3 N4的相变，但由于其独特的孔结构，有利于提高多孔Si 3 N4的力学性能。
Porous Si3N4ceramics were prepared by freeze casting using liquid N2as refrigerant. The pore structure, porosity, α→β-Si3N4transformation and mechanical properties of the obtained materials were strongly affected by the solid contents of the slurries. Increasing the solid content would reduce the porosity, decrease the pore size and change the pore structure from the aligned channels with dendrites to the round pores with decreased pore size. The formation of this round pores impeded the α→β-Si3N4phase transformation, but was beneficial to the mechanical properties of the obtained porous Si3N4due to its unique pore structure.