Chern Lin J H, Chen Y F, Ju C P
Department of Materials Science and Engineering, National Cheng-Kung University, Tainan, Taiwan.
Biomaterials. 1995 Dec;16(18):1401-7. doi: 10.1016/0142-9612(95)96876-2.
The focus of this study was placed on the effect of nickel addition (5 wt%) on the microstructure, castability, biocorrosion resistance and some other properties of a series of cast high-cobalt (up to 25 wt%) Ti-Co-Ni alloys. Results indicated that melting temperatures of the present alloys were much lower than the melting temperature of pure titanium. Addition of 5 wt% Ni to replace an equivalent amount of Co slightly lowered the eutectoid and melting temperatures. Castability of the alloys was enhanced by the high alloy content and higher mould temperature. Substitution of 5 wt% Ni for Co increased the castability values. The phase transformation of beta-Ti to alpha-Ti was enhanced by nickel addition and higher mould temperature. Microhardness of the alloys increased with cobalt content and decreased with mould temperature. The addition of nickel lowered the hardness of the alloys. Breakdown potentials of the alloys were all higher than 900 mV and the critical anodic current densities were all lower than 8 microA cm-2.
本研究的重点是添加5 wt%镍对一系列铸造高钴（高达25 wt%）Ti-Co-Ni合金的微观结构、铸造性能、生物耐腐蚀性能及其他一些性能的影响。结果表明，当前合金的熔化温度远低于纯钛的熔化温度。添加5 wt%镍以替代等量的钴会略微降低共析温度和熔化温度。高合金含量和较高的模具温度提高了合金的铸造性能。用5 wt%镍替代钴提高了铸造性能值。添加镍和较高的模具温度增强了β-Ti向α-Ti的相变。合金的显微硬度随钴含量的增加而增加，随模具温度的降低而降低。添加镍降低了合金的硬度。合金的击穿电位均高于900 mV，临界阳极电流密度均低于8 μA/cm²。
