Laser cladding experiments were done on a 5-kW continuous wave CO2 laser to synthesize TiC and TiB rein- fowed titanium matrix composite coatings on Ti-6AI-4V alloy with a mixture of Ti and B4C precursor powder. The t...Laser cladding experiments were done on a 5-kW continuous wave CO2 laser to synthesize TiC and TiB rein- fowed titanium matrix composite coatings on Ti-6AI-4V alloy with a mixture of Ti and B4C precursor powder. The ther- modynamics of the reactions were calculated and analyzed. The microstructure and phase evolution of TiB and TiC com- posites were investigated. The results showed that the chemical reaction between Ti and B4C would release much heat, and these compounds, TiC, TiB, and small amount of TiB2, can be formed on the surface of Ti-6AI-4V alloy if the supplied en- ergy is sufficient to excite the reaction among the initial products. A good metallurgical bond between the coating and the substrate can be achieved. The microhardness of coating was irregular and the maximum value was approximately HV600.展开更多
利用钛与碳化硼及石墨之间的自蔓燃高温合成反应 ,经非自耗电弧熔炼工艺制备了 Ti B晶须和 Ti C粒子混杂增强的钛基复合材料。借助扫描电镜和透射电镜观察了复合材料的微观结构 ,结果表明 :原位合成增强体均匀地分布在基体合金中 ,Ti B...利用钛与碳化硼及石墨之间的自蔓燃高温合成反应 ,经非自耗电弧熔炼工艺制备了 Ti B晶须和 Ti C粒子混杂增强的钛基复合材料。借助扫描电镜和透射电镜观察了复合材料的微观结构 ,结果表明 :原位合成增强体均匀地分布在基体合金中 ,Ti B增强体以晶须状生长 ,而 Ti C增强体以树枝状、等轴状生长。原位合成增强体与基体合金的界面非常干净 ,不存在界面反应产物 ,但 Ti C粒子周围的基体合金中存在高密度的位错。原位合成增强体的加入提高了复合材料的力学性能 ,合金化元素铝的加入不仅固溶强化了钛基体合金 ,同时使增强体长得更为细小 。展开更多
Fe-based layer with Ti（CxN1-x） particulates on Adamite roller surface was obtained by a 5 kW traverse-flowing CO2 laser cladding technology. The microstructures of the layer were detected by optical microscopy （OM...Fe-based layer with Ti（CxN1-x） particulates on Adamite roller surface was obtained by a 5 kW traverse-flowing CO2 laser cladding technology. The microstructures of the layer were detected by optical microscopy （OM）,X-ray diffraction （XRD）,scanning electron microscopy （SEM）,and electron probe microscopy analysis （EMPA）. The tests of wear resistance was carried out on the test machine. It was seen that a good metallurgical bonding between the coating and the substrate was achieved. The microstructure contains bulky dendritic crystal and small size Ti（CxN1-x） grains that are uniformly distributed in the solid solution matrix. The wear tests showed that the laser coating provided an excellent wear resistance property at room temperature.展开更多
基金financially supported by the National "973" Research Project (No. 2006CB605206-1)
文摘Laser cladding experiments were done on a 5-kW continuous wave CO2 laser to synthesize TiC and TiB rein- fowed titanium matrix composite coatings on Ti-6AI-4V alloy with a mixture of Ti and B4C precursor powder. The ther- modynamics of the reactions were calculated and analyzed. The microstructure and phase evolution of TiB and TiC com- posites were investigated. The results showed that the chemical reaction between Ti and B4C would release much heat, and these compounds, TiC, TiB, and small amount of TiB2, can be formed on the surface of Ti-6AI-4V alloy if the supplied en- ergy is sufficient to excite the reaction among the initial products. A good metallurgical bond between the coating and the substrate can be achieved. The microhardness of coating was irregular and the maximum value was approximately HV600.
文摘利用钛与碳化硼及石墨之间的自蔓燃高温合成反应 ,经非自耗电弧熔炼工艺制备了 Ti B晶须和 Ti C粒子混杂增强的钛基复合材料。借助扫描电镜和透射电镜观察了复合材料的微观结构 ,结果表明 :原位合成增强体均匀地分布在基体合金中 ,Ti B增强体以晶须状生长 ,而 Ti C增强体以树枝状、等轴状生长。原位合成增强体与基体合金的界面非常干净 ,不存在界面反应产物 ,但 Ti C粒子周围的基体合金中存在高密度的位错。原位合成增强体的加入提高了复合材料的力学性能 ,合金化元素铝的加入不仅固溶强化了钛基体合金 ,同时使增强体长得更为细小 。
基金Sponsored by Shandong Natural Science Foundation of China (Z2006F07)
文摘Fe-based layer with Ti（CxN1-x） particulates on Adamite roller surface was obtained by a 5 kW traverse-flowing CO2 laser cladding technology. The microstructures of the layer were detected by optical microscopy （OM）,X-ray diffraction （XRD）,scanning electron microscopy （SEM）,and electron probe microscopy analysis （EMPA）. The tests of wear resistance was carried out on the test machine. It was seen that a good metallurgical bonding between the coating and the substrate was achieved. The microstructure contains bulky dendritic crystal and small size Ti（CxN1-x） grains that are uniformly distributed in the solid solution matrix. The wear tests showed that the laser coating provided an excellent wear resistance property at room temperature.
