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.
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