CAJ | 학술논문

采用特殊的化学及物理处理方法,在钛合金表面制备TiO_2-PTFE复合膜层,该润滑膜由硬质阳极氧化膜与低摩擦系数的聚四氟乙烯(PTFE)结合而成,具有较好的自润滑特性.研究了TiO_2-PTFE复合膜层的组织形貌、物相组成以及元素组分,讨论了阳极氧化处理工艺和涂覆时间对PTFE涂覆量的影响.结果表明,TC4钛合金阳极氧化后形成了由锐钛相和金红石相双相晶型组成的纳米级TiO_2多孔膜,涂覆PTFE后,表面及膜孔处被PTFE聚合体所覆盖.TC4钛合金样品经过不同电压和不同氧化时间处理后,PTFE涂覆量趋于稳定.随着涂覆时间的延长,PTFE涂覆量逐渐增加,在最初5～20min内,涂覆量增加较快,超过20min后涂覆量增加缓慢.
채용특수적화학급물리처리방법,재태합금표면제비TiO_2-PTFE복합막층,해윤활막유경질양겁양화막여저마찰계수적취사불을희(PTFE)결합이성,구유교호적자윤활특성.연구료TiO_2-PTFE복합막층적조직형모、물상조성이급원소조분,토론료양겁양화처리공예화도복시간대PTFE도복량적영향.결과표명,TC4태합금양겁양화후형성료유예태상화금홍석상쌍상정형조성적납미급TiO_2다공막,도복PTFE후,표면급막공처피PTFE취합체소복개.TC4태합금양품경과불동전압화불동양화시간처리후,PTFE도복량추우은정.수착도복시간적연장,PTFE도복량축점증가,재최초5～20min내,도복량증가교쾌,초과20min후도복량증가완만.
TiO_2-PTFE compound coating was prepared on the surface of TC4 titanium alloy by the special chemical and physical method.The lubricant film was composed of hard anodic oxidation film and PTFE with low friction factor,which had excellent self-lubricant property.Microstructure and morphology,phase composition and element composition of TiO_2-PTFE compound coating were investigated.The effect of anodic oxidation treatment process and coating time on the coating volume of PTFE was discussed.Results of the experiment showed that after anodic oxidation,the nanometer TiO_2 porous film was consisted of annatase and rutile phases formed on TC4 titanium alloy.After being coated with PTFE,the surface and film hole were covered by PTFE polymer.The PTFE coating volume kept stable after the samples of TC4 titanium alloy being treated in different voltages and different oxidation time.As the coating time prolonging,the PTFE coating volume increased rapidly in the first 5-20min,the coating volume increased slowly after more than 20min.