标题：Element distribution and phase constitution of Al_2O _3-TiC/W18Cr4V vacuum diffusion bonded joint
作者：Wanqun, H.;Yajiang, L.;Juan, W.;Qinglei, J.
作者机构：[Wanqun, H] Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jing Shi Roa 更多
通讯作者地址：[Huang, WQ]Shandong Univ, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Jing Shi Rd 17923, Jinan 250061, Shandong, Peoples R China.
来源：Vacuum: Technology Applications & Ion Physics: The International Journal & Abstracting Service for Vacuum Science & Technology
关键词：Al _2O_3-TiC ceramic composites;Diffusion bonding;Electron probe microanalysis;X-ray analysis
摘要：Vacuum diffusion bonding between Al_2O_3-TiC ceramic composites and W18Cr4V tungsten-based tool alloy has been carried out by using Ti/Cu/Ti multi-interlayer. Element distribution near the Al_2O _3-TiC/W18Cr4V interface was discussed and fracture morphology was analyzed using electron probe microanalysis. Additionally, phase constitutions of the Al_2O_3-TiC/W18Cr4V joint were determined by X-ray diffraction. The results indicate that Ti-rich layers are formed near both Al_2O_3-TiC and W18Cr4V. The Ti-rich layer near Al _2O_3-TiC helps to wet the Al_2O_3-TiC surface. The Ti-rich layer near W18Cr4V can restrain the formation of Fe-Ti intermetallic compounds in the diffusion transition zone. Residual Cu in the diffusion transition zone can act as a stress releasing zone. The structures of interfacial phases are identified as follows: Al_2O _3-TiC/TiO + Ti_3Al/Cu + CuTi/TiC layer/mixed layer of Fe_3W_3C, Cr_(23)C_6 and α-Fe/W18Cr4V. The fracture morphology of Al_2O _3-TiC/W18Cr4V joint appears brittle features and the failure occurs within the Al_2O_3-TiC ceramic.