摘要
钛基生物医学材料广泛应用于人体硬组织的修复,但耐磨性较差,限制了其更广泛的应用。采用瞬态电能强化技术以石墨为电极对钛合金TC4进行表面改性,对比研究了在空气、氩气和氮气气氛下获得的强化层的性能,并对氮气中制备的强化层的生物相容性进行了评价。结果表明,强化改性层物相主要为TiC及石墨相,表面硬度有较大提高,摩擦学性能获得显著改善,改性层与基体相比仍具有优异的耐蚀性能;氩气和氮气气氛下获得的强化层表面裂纹比空气气氛下的少;氮气保护下可得到裂纹较少、具有一定粗糙度、耐磨、生物相容性好且与基体为冶金结合的强化层。
Titanium-based biomedical materials were widelv used for pros-thesis of human hard tissue.However,its clinical use was limitedby poor wear resistance.Thus transient discharge technology wasused to strengthen the surface of Ti alloy TC4,where graphiteelectrode was employed.The properties of the strengthened layerprepared under air,argon and nitrogen gas were examined,andthe bio-compatibility of the modified surface prepared under nitro-gen gas was evaluated.Results show that the surface modificationleads to a noticeable increase of hardness of the Ti alloy,due tothe formation of modified layers consisting of TiC and graphite.The modified surface showed significantly increased wear resist-ance than Ti alloy substrate and retained excellent corrosion re-sistance.At the same time,the modified surface prepared underargon or nitrogen gas had less surface cracks than the one ob-tained in air.In particular,the modified surface prepared underthe protection of nitrogen gas had excellent wear resistance andgood bio-compatibility as well as strong metallurgical bondingwith the Ti alloy substrate.
出处
《材料保护》
CAS
CSCD
北大核心
2010年第2期17-20,28,共5页
Materials Protection
基金
西安建筑科技大学青年科技基金资助项目(QN0612)
关键词
表面改性
生物医学材料
钛合金
瞬态电能处理
保护气氛
摩擦磨损
耐蚀性
生物相容性
surface modification
biomedical materials
titaniumalloy
transient electric energy
protective atmosphere
frictionwear
corrosion resistance
bio-compatibility
