SiO<sub>2</sub>中间层反应连接LaCrO<sub>3</sub>陶瓷的机理及界面应力模拟研究

doi:10.11896/cldb.23120208

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Abstract Appropriate joining technology is an effective method to improve the processing performance of LaCrO₃ ceramics. In this work, a process of connecting LaCrO₃ with SiO₂ powder as the intermediate layer was proposed to assist in the manufacture of large parts. The connection mechanism, microstructure and mechanical properties of LaCrO₃ connectors were studied. The interface stress distribution of connectors was analyzed by finite element simulation. The results show that Cr-doped La₂Si₂O₇ is formed by the composite reaction of LaCrO₃/SiO₂ mixed powder ( molar ratio (0.95—1.55) ∶1 ) at 1 250—1 450 ℃. The process of SiO₂ joining LaCrO₃ is reaction and diffusion joining. When the joining temperature is 1 450 ℃, the highest joining strength of 29.3 MPa is obtained, and the stress concentration occurred in the SiO₂ interlayer and the vicinity of the base metal. SiO₂ can be used as a potential interlayer to assist in the fabrication and repair of LaCrO₃ ceramics with complex shapes.

Key words： LaCrO₃ La₂Si₂O₇ connection stress simulation

Published: 10 September 2024 Online: 2024-09-30

CLC number:

TG497

Fund:National Natural Science Foundation of China (51865044), Ministry of Education, China University Industry-University-Research Innovation Fund-Key Project(2021ITA05005), Natural Science Foundation of Inner Mongolia Autonomous Region (2023LHMS01013), Key Research and Development Project of Inner Mongolia Autonomous Region (2023YFJM0007), Inner Mongolia Autonomous Region Science and Technology Innovation Guidance Project (2022CXYD001), Fundamental Research Funds for the Central Universities (21623219), Basic Scientific Research Business Fee Project of Universities Directly Under the Inner Mongolia Autonomous Region (JY20220144), Foundation of State Key Laboratory of Public Big Data (QJJ[2022]418), and Joint Open Fund of Guizhou Provincial Department of Education ([2022]438).

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	ZHAO Min
	GUO Hongfei
	HOU Xiaohu
	WU Jiafang

Cite this article:

ZHAO Min,GUO Hongfei,HOU Xiaohu, et al. Reaction Joining Mechanism and Interface Stress Simulation of LaCrO₃ Ceramics with SiO₂ Interlayer[J]. Materials Reports, 2024, 38(17): 23120208-8.

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http://www.mater-rep.com/EN/10.11896/cldb.23120208 OR http://www.mater-rep.com/EN/Y2024/V38/I17/23120208

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