TiC-TiB2 Coating on Ti-6Al-4V alloy Substrate in Graded Composition Achieved by Fusion Bonding and Atomic Interdiffusion under Combustion Synthesis in High-gravity Field
Based on fusion bonding of liquid TiC-TiB2 ceramic film and molten Ti-6Al-4V substrate to induce the surface alloying of Ti-6Al-4V substrate,the TiC-TiB2 ceramic coating on Ti-6Al-4V substrate was achieved in graded composition by combustion synthesis in high-gravity field.XRD,FESEM and EDS results showed that TiC-TiB2 ceramic coating was composed of fine TiB2 platelets,TiC irregular grains,Cr metallic phase and a few Al2O3 inclusions.The mechanical properties showed that the relative density,microhardness and fracture toughness of TiC-TiB2 ceramic coating reached 98.5%,25.8 ± 3.5 GPa and 16.5 ± 2.5 MPa · m0.5,respectively.The fusion-bonding area and heat-affected zone of Ti alloy were obviously observed between the ceramic coating and Ti alloy substrate,and within the fusion bonding area a number of ultralfine TiB platelets and fine Ti-enriched carbides were embedded in the matrix of α-Ti martensite,whereas at the heat-affected zone of Ti-6Al-4V substrate some C,B atoms were also detected.As a coupled result of fusion bonding and inter-diffusion between liquid ceramic film and molten Ti alloy substrate,followed by TiB2-Ti peritectic reaction and subsequent eutectic reaction in TiC-TiB-Ti ternary system,the ceramic coating of TiC-TiB2 on Ti-6Al4V substrate was achieved in continuously-graded composition,presenting the transitional change in microhardness from the ceramic coating to Ti alloy substrate with high shear strength of 450 ± 35 MPa between the coating and the substrate.
ceramic coating fusion bonding atomic interdiffusion surface alloying graded joint
Xuegang Huang Zhongmin Zhao Long Zhang Liqing Shi
Mechanical Engineering College,Shijiazhuang 050003,China
国际会议
2012 Workshop on Inorganic Thin Films and Coatings (2012年无机薄膜与涂层学术研讨会)
桂林
英文
46-51
2012-07-16（万方平台首次上网日期，不代表论文的发表时间）