1 School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China 2 Advanced Materials and Energy Institute, Inner Mongolia Academy of Science and Technology,Hohhot 010020, China
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.
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