TL;DRAbstract
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 1130℃for 1h 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 3400 HM to 1000 HM. The phases formed in the diffusion transition zone are Ti3Al, CuTi2, Cu and TiC.
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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 1130℃for 1h 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 3400 HM to 1000 HM. The phases formed in the diffusion transition zone are Ti3Al, CuTi2, Cu and TiC.
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