Pore structure control of starch processed silicon nitride porous ceramics with near-zero shrinkage期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Pore structure control of starch processed silicon nitride porous ceramics with near-zero shrinkage

Authors:	Fei Chen Lingling MaQiang Shen Lianmeng Zhang

Affiliation:	^a Key Laboratory of Advanced Technology for Specially Functional Materials, Ministry of Education, Wuhan University of Technology, Wuhan 430070, China ^b State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China

Abstract:	Zirconium phosphate (ZrP₂O₇) bonded silicon nitride (Si₃N₄) porous ceramics were prepared using starch powder as the pore forming agent and pressureless sintering technique. The obtained results show that the porosity of the sintered starch processed 25 wt.% ZrP₂O₇ bonded Si₃N₄ porous ceramics is 36-62.3%. All the samples exhibit surprisingly low linear shrinkage. The pores are formed by the continuous reaction of ZrP₂O₇ at ~ 250 °C and burnout of starch at ~ 550 °C, during which a large amount of pores with pore sizes of less than 0.5 μm and ~ 10 μm are formed.

Keywords:	Porous silicon nitride Pore-forming agent Phosphate Starch
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