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科学通报  2015 

Si3N4的氧化预处理对浆料流变性及多孔陶瓷性能的影响

DOI: 10.1360/N972014-00467, PP. 309-316

Keywords: Si3N4,多孔陶瓷,氧化处理,流变特性,液相烧结

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Abstract:

以a相Si3N4粉为原料,通过氧化预处理改善Si3N4粉体表面性质,制备具有高固相含量、低黏度的陶瓷悬浮体,添加5%(质量百分比,下同)Y2O3为烧结助剂,经注浆成型工艺及液相烧结工艺制备多孔Si3N4陶瓷.研究了不同预处理温度对Si3N4粉体表面化学性质、浆料流变特性及对多孔陶瓷的影响.在低于850℃的温度下对Si3N4粉末进行处理,在表面得到了以Si2N2O为主的涂层;随着温度的增加,涂层中的Si2N2O含量增加,Si3N4含量降低,750℃以后Si3N4消失,出现SiO2.当氧化预处理温度为850℃时,Si3N4浆料的黏度由原始粉料的1680mPas降至30mPas.粉料表面氧含量的增加导致了烧结时液相量的增加,促进了致密化,同时也抑制了b-Si3N4的成核,液相量过高时,形成低长径比、大尺寸的b-Si3N4晶粒.因此氧化处理时需要选择适当的条件,在降低浆料黏度的同时保持一定的气孔率.

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