Effect of sintering temperature on microstructure and mechanical properties of highly porous silicon nitride ceramics produced by freeze casting
Effect of sintering temperature on microstructure and mechanical properties of highly porous silicon nitride ceramics produced by freeze casting
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DOI：
10.1016/j.msea.2010.07.038
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发表时间：
2010-09
期刊：
影响因子：
6.4
通讯作者：
F. Ye;Jing-yi Zhang;Haijiao Zhang;Limeng Liu
中科院分区：
文献类型：
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作者：
F. Ye;Jing-yi Zhang;Haijiao Zhang;Limeng Liu
以液氮为制冷剂，采用单向冷冻铸造法制备了具有宏观取向的高孔Si 3 N4。提高烧结温度对孔隙率没有明显影响，但显著促进了α→β-Si 3 N4相变和纤维状β-Si 3 N4晶粒的生长，改变了孔隙结构。在1900°C烧结的样品的抗弯强度和断裂韧性分别达到73 MPa和1.1MPam1/2。
Highly porous Si3N4with macroscopically aligned pores were prepared by the unidirectional freeze casting process using liquid N2as refrigerant. The increased sintering temperature had no obvious influence on the porosity, but significantly promoted α→β-Si3N4phase transformation and the growth of fibrous β-Si3N4grains, and changed the pore structure. The flexural strength and fracture toughness of the sample sintered at 1900°C could reach 73MPa and 1.1MPam1/2, respectively.