SiO_(2)中间层反应连接LaCrO_(3)陶瓷的机理及界面应力模拟研究  

Reaction Joining Mechanism and Interface Stress Simulation of LaCrO_(3) Ceramics with SiO_(2) Interlayer

作　　者：赵敏 郭洪飞[1,2] 侯小虎 邬佳芳[1] ZHAO Min;GUO Hongfei;HOU Xiaohu;WU Jiafang(School of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Advanced Materials and Energy Institute,Inner Mongolia Academy of Science and Technology,Hohhot 010020,China)

机构地区：[1]内蒙古工业大学材料科学与工程学院,呼和浩特010051 [2]内蒙古科学技术研究院先进材料与能源研究所,呼和浩特010020

出　　处：《材料导报》2024年第17期96-103,共8页Materials Reports

基　　金：国家自然科学基金(51865044);教育部中国高校产学研创新基金-重点项目(2021ITA05005);内蒙古自治区自然科学基金(2023LHMS01013);内蒙古自治区重点研发项目(2023YFJM0007);内蒙古自治区科技创新引导项目(2022CXYD001);中央高校基本科研业务费专项资金资助(21623219);内蒙古自治区直属高校基本科研业务费项目(JY20220144);省部共建公共大数据国家重点实验室(贵州大学)联合开放基金项目(黔教技[2022]418号);贵州省教育厅联合开放基金([2022]438号)。

摘　　要：合适的连接技术是提高LaCrO_(3)陶瓷加工性能的有效方法。本工作提出以低成本SiO_(2)粉末为中间层、利用放电等离子技术连接LaCrO_(3)的工艺,研究了LaCrO_(3)连接件的连接机理、显微形貌、力学性能等,并利用有限元模拟分析连接件界面应力分布状态。结果表明:LaCrO_(3)/SiO_(2)混合粉末(物质的量比(0.95~1.55)∶1)在1250~1450℃下复合反应生成Cr掺杂的La_(2)Si_(2)O_(7),SiO_(2)中间层连接LaCrO_(3)陶瓷为反应、扩散连接。在1450℃时,连接件获得最高连接强度(29.3 MPa),SiO_(2)中间层及其母材附近区域产生应力集中。SiO_(2)可以作为辅助制造和修复复杂形状LaCrO_(3)陶瓷的一种有潜力的连接中间层。Appropriate joining technology is an effective method to improve the processing performance of LaCrO_(3) ceramics.In this work,a process of connecting LaCrO_(3) with SiO_(2) powder as the intermediate layer was proposed to assist in the manufacture of large parts.The connection mechanism,microstructure and mechanical properties of LaCrO_(3) connectors were studied.The interface stress distribution of connectors was analyzed by finite element simulation.The results show that Cr-doped La_(2)Si_(2)O_(7) is formed by the composite reaction of LaCrO_(3)/SiO_(2) mixed powder(molar ratio(0.95-1.55)∶1)at 1250-1450℃.The process of SiO_(2) joining LaCrO_(3) is reaction and diffusion joining.When the joining temperature is 1450℃,the highest joining strength of 29.3 MPa is obtained,and the stress concentration occurred in the SiO_(2) interlayer and the vicinity of the base metal.SiO_(2) can be used as a potential interlayer to assist in the fabrication and repair of LaCrO_(3) ceramics with complex shapes.

关 键 词：LaCrO_(3) La_(2)Si_(2)O_(7) 连接 应力模拟 

分 类 号：TG497[金属学及工艺—焊接]