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α-Si3N4粉体原料对多孔氮化硅陶瓷微观组织和力学性能的影响
作者:朱宇璇1  强1  波1 杨建锋1 顾士甲2 张国军2 
单位:(1. 西安交通大学 金属材料强度国家重点实验室 西安 710049 2. 东华大学 纤维材料改性国家重点实验室 上海 201620) 
关键词:多孔氮化硅陶瓷 α–β相变 致密化 
分类号:TQ174
出版年,卷(期):页码:2019,47(9):0-0
DOI:
摘要:

 以具有相似粒径的国产和进口α-Si3N4粉体为原料、Y2O3为烧结助剂,1 750 ℃常压烧结制备多孔氮化硅陶瓷,对比粉体的影响。国产粉的球形度比进口粉要差,但是二者的成形坯体和烧结体均具有相似的致密度,并且进口粉制备的样品具有细棒状晶的微观组织和较高的强度。对2种α-Si3N4粉体引入Y2O3–Al2O3复合助剂体系进行的烧结研究表明:α-Si3N4粉体通过影响颗粒重排和溶解–沉淀过程影响不同烧结体的致密化和相转变,国产粉相变速率快而致密化慢,由此解释了多孔氮化硅陶瓷存在微观结构和强度差异的原因。

基金项目:
国家重点研发计划(2017YFB0310300);国家自然科学基金(51672209,51872223)资助。
作者简介:
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