电焊机2023，Vol.53Issue(12)：1-6,6.DOI:10.7512/j.issn.1001-2303.2023.12.01
SiC-Al2O3-Y2O3中间层放电等离子扩散连接SiC陶瓷的接头组织与强度
Microstructure and Strength of SiC Ceramic Joints Diffusion Bonded by Spark Plasma Sintering with the SiC-Al2O3-Y2O3 Interlayer
摘要
Abstract
In this study,the pressureless-sintered SiC and SiC-based powder(SiC-Al2O3-Y2O3)were used as the substrate and interlayer,respectively,for joining of SiC ceramics by spark plasmas sintering.The microstructure and strength of SiC joints were investigated by means of metalloscope,scanning electron microscopy,energy spectroscopy,electron backscatter diffraction and shear test.The microstructural characterization indicated that the SiC joint exhibited a high-quality interface bonding with uniform thickness in the interlayer.The main phase compositions of the joint were β-SiC and Y-Al-Si-O-C.The fine β-SiC grains in the interlayer exhibited a random orientation.No significant β→α phase transition occurred at the joint due to the fast process of diffusion bonding by spark plasma sintering.Meanwhile,no significant stress concentration was observed at the interface because of the near-homogeneous SiC joint formed.The initial room temperature shear strength of the SiC joint was 219.9 MPa,which increased to 320.8 MPa after heat treatment in air at 800 ℃ for 2 h.Further increasing the heat treatment temperature to 1300 ℃,the joint strength increased to 389.1 MPa.The joint fracture occurred mainly at the substrate with a river-like pattern,as a representative of brittle fracture.The increase of joint strength may be attributed to the interaction of Y-Al-Si-O-C and SiO2 produced during the heat treatment process,healing the defects pre-sented in the SiC substrate such as microcracks.关键词
碳化硅/放电等离子扩散连接/微观组织/剪切强度Key words
silicon carbide/diffusion bonding by spark plasma sintering/microstructure/shear strength分类
通用工业技术引用本文复制引用
王亚峰,魏连峰,杨富荃,李华鑫,董宇,郑勇,贺艳明,杨建国..SiC-Al2O3-Y2O3中间层放电等离子扩散连接SiC陶瓷的接头组织与强度[J].电焊机,2023,53(12):1-6,6.基金项目
国家自然科学基金(52005445) （52005445）
浙江省自然科学基金(LQ21E050018) （LQ21E050018）
中国博士后科学基金(2022M712820) （2022M712820）
中核集团青年英才科研项目 （）
