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《Transactions of the China Welding Institution》 2013-05
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Layered composite of solidified TiC-TiB_2 ceramic to Ti-6Al4V alloy achieved by fusion bonding

SONG Yalin, ZHANG Long,ZHAO Zhongmin,MA Tao ( Teaching and Research Section of Mechanical Manufacturing,Department of Vehicle and Electric Engineering,Ordnance Engineering College, Shijiazhuang 050003,China)  
By introduction of Ti-6Al-4V plate at the bottom of combustion system in high-gravity field,fusion bonding of TiC-TiB2 ceramic to Ti-6Al-4V alloy was achieved.The solidified TiC-TiB2 ceramic with fine grains was prepared by combustion synthesis.Furthermore,the ceramic to titanium layered composite with chemical composition gradient was obtained.The microstructure of fusion bonding of TiC-TiB2 ceramic to Ti-6Al4V alloy indicates that,the presence of chemical reaction in explosive combustion and the subsequent thermal vacuum induced by liquid products in high-gravity field make Ti alloy partially fused.Then atomic inter-diffusion occurs spontaneously between liquid ceramic and molten Ti alloy,resulting in the achievement of the joint.Microstructure analysis shows that in the bonding joint,titanium riched carbides are distributed homogeneously with fine TiB2 grains embedded in the matrix of Ti alloy.Shear strength of 450 MPa ± 35 MPa is achieved between the ceramic and Ti alloy.Vickers hardness decreases linearly from the ceramic to Ti alloy.
【Fund】: 国家自然科学基金资助项目(51072229)
【CateGory Index】: TB333
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