期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 528, 期 3, 页码 1421-1424出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2010.10.066
关键词
Porous Si3N4; Freeze casting; Pore structure; Mechanical properties
类别
资金
- National Natural Science Foundation of China [90716022]
Porous Si3N4 ceramics were prepared by freeze casting using liquid N-2 as refrigerant. The pore structure, porosity, alpha -> beta-Si3N4 transformation 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 alpha -> beta-Si3N4 phase transformation, but was beneficial to the mechanical properties of the obtained porous Si3N4 due to its unique pore structure. (C) 2010 Elsevier B.V. All rights reserved.
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