杨帆,李真有,丁鹏博,王若羽,王亚珂,梁丽萍

• 1:太原科技大学材料科学与工程学院

摘要(Abstract)：

采用液相合成方法制备3 wt.%SiO_2掺杂ZrO_2粉体，探讨复合氧化物的形成机制及其在(300～1 400)℃温度范围内的热行为。研究发现，在液相反应阶段，硅物种参与了锆源的水解-缩聚过程，通过形成Si-O-Zr键合实现了两组元间的复合。当热处理温度不高于750℃时，SiO_2引入稳定了ZrO_2的四方相，也提高了粉体颗粒尺寸的热稳定性。当热处理温度达到1 000℃及以上时，Si-O-Zr键断裂，四方相不能以亚稳态存在。这使得在1 250℃与1 400℃烧结过程中，源自750℃焙烧粉体且具有纯四方相的生坯经历四方→单斜→四方→单斜的晶型转变；伴随相变过程，坯体发生膨胀、收缩、再膨胀，因而产生大量裂纹并遭到破坏，且晶粒在无约束状态下异常长大至微米量级。此外，Si-O-Zr键断裂形成游离态SiO_2.经1 250℃与1 400℃烧结后，SiO_2以玻璃相分布于晶界处并与ZrO_2发生反应生成新相ZrSiO_4.

关键词(KeyWords)： ZrO_2;SiO_2掺杂ZrO_2;晶型结构;热行为

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51802212);; 山西省自然科学基金项目(201801D221119);; 国家级大学生创新创业项目(2019339)

作者(Author): 杨帆,李真有,丁鹏博,王若羽,王亚珂,梁丽萍

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