Ti6Al4V合金表面氩弧熔覆原位合成TiC-TiB2增强钛基复合涂层组织与耐磨性
Microstructure and wear resistance of Ti-based composite coating reinforced by in-situ synthesized TiC and TiB2 particulates on surface of Ti6Al4V alloy with arc cladding
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摘要: 以B4C和Ni60A粉末为预涂材料,采用氩弧熔覆技术,在Ti6Al4V合金表面原位合成TiC与TiB2增强相增强钛基复合材料涂层.运用XRD,SEM等分析手段研究了复合涂层的显微组织,利用显微硬度仪测试了复合涂层的显微硬度并用磨损试验机分析了其在室温干滑动磨损条件下的耐磨性能.结果表明,熔覆层组织主要由TiC和TiB2组成,TiC颗粒和TiB2颗粒弥散分布在基体上,TiC颗粒的尺寸为2~3μm,而呈长条状的TiB2颗粒尺寸为3~5μm.显微硬度和耐磨性测试结果表明,该复合涂层显微维氏硬度高达1200MPa左右,复合涂层的耐磨性能比Ti6Al4V基体提高约20倍.Abstract: Ti-based composite coating reinforced by in-situ synthesized TiC and TiB2 particulates was prepared with prealloyed powder of B4 C and Ni60 A on the surface of Ti6Al4 V alloy by means of argon arc cladding. The microstructure was examined by using X-ray diffraction and scanning electron microscope. The microhardness of composite coating was measured using the microhardness meter and the wear resistance was analyzed using the wear testing machine in the condition of dry sliding wear at room temperature. The results show that the main phases in the coating were TiC and TiB2. The TiC and TiB2 particles distributed uniformly. The size of TiC was about 2-3 μm and that of TiB2 was 3-5 μm. The microhardness of the coating was about HV1200. The wear resistance of composite coating was improved about 20 times, compared with that of Ti6Al4 V alloy substrate in the condition of dry sliding wear at room temperature.
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