摘要
利用氩弧熔覆技术在TC4合金表面成功制备出TiC、TiB、TiB2增强Ti基复合涂层。利用SEM、XRD和EDS分析了熔覆涂层的显微组织;利用显微硬度仪测试了复合涂层的显微硬度;利用摩擦磨损试验机测试了涂层在室温干滑动磨损条件下的耐磨性能。结果表明:氩弧熔覆涂层组织均匀致密,熔覆层与基体呈冶金结合,TC4合金表面有颗粒状TiC、粗大棒状相TiB2、细小棒状相TiB生成;复合涂层明显改善了TC4合金的表面硬度,涂层的最高显微硬度可达1300 HV0.2;复合涂层在室温干滑动磨损试验条件下具有优异的耐磨性,磨损机制主要是魔力磨损,其耐磨性较TC4合金基体提高近10倍。
Ti-based composite coating reinforced by TiC, TiB and TiB2 particles was prepared on surface of TC4 alloy by argon arc cladding technique with the pre-alloyed powder of Ni60A and B4C. Microstructure of the coating was analyzed by means of scanning electron microscopy （SEM） , X-ray diffraction（XRD） and energy-dispersive spectrometer （EDS） analysis. Microhardness and wear resistance of the composite coating at room temperature were examined by means of microhardness test and wear test, respectively. The results indicate that excellent metallurgical bonding between the coating and the TC4 alloy substrate is obtained and the coating, consisting of TiC,TiB and TiB2 phases and Ti matrix, is uniform and compact. The composite coating reinforced by TiC,TiB and TiB2 particles apparently improves surface hardness of TC4 alloy, the highest microhardness can reach 1300 HV 0. 2. The composite coating has excellent wear resistance under dry sliding wear test conditions. The wear mechanism of the coating is abrasive wear. The wear resistance of the composite coating is ten times higher than that of TC4 alloy.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第3期140-144,共5页
Transactions of Materials and Heat Treatment
基金
黑龙江省科技厅项目(12511469)
黑龙江省科技攻关项目(GB03A202)
