【摘要】 通过添加Ti/Cu/Ti复合中间层,控制加热温度1 130℃,保温1 h,连接压力15 MPa,实现陶瓷基复合材料TiC-Al2O3与高速钢W18Cr4V的真空扩散连接,TiC-Al2O3/W18Cr4V接头抗剪强度达103 MPa。采用扫描电镜、X射线衍射、电子探针等测试方法分析了TiC-Al2O3/W18Cr4V扩散连接接头的微观组织结构和显微硬度分布。结果表明,Ti/Cu/Ti复合中间层与两侧基体TiC-Al2O3和W18Cr4V发生扩散结合,形成均匀致密、宽度为90μm的扩散过渡区,过渡区显微硬度从3 400 HM逐渐降低到1 000 HM,形成的相结构主要有Ti3Al,CuTi2,Cu和TiC。更多还原

【Abstract】 Diffusion bonding of ceramic matrix composite TiC-Al₂O₃ and tool steel W18Cr4V was successfully carried out by addition of composite interlayer Ti/Cu/Ti at 1 130 ℃ for 1 h with a pressure of 15 MPa.Shear strength of the bonded TiC-Al₂O₃ /W18Cr4V joint is 103 MPa.Microstructure characteristics and microhardness in the diffusion bonded TiC-Al₂O₃ /W18Cr4V joint were investigated by means of scanning electron microscope,X-ray diffractometry and electron probe microanalysis.The results indicate that Ti/Cu/Ti interlayer has been fully diffused to combine with matrixes including TiC-Al₂O₃ and W18Cr4V and a diffusion transition zone with a thickness of 90 μm is formed.The microhardness from TiC-Al₂O₃ to W18Cr4V across the diffusion transition zone decreases from 3 400 HM to 1 000 HM.The phases formed in the diffusion transition zone are Ti₃Al,CuTi₂,Cu and TiC.更多还原