Synthesis and characterization of Ti-Co alloy foam for biomedical applications

生物医学用泡沫Ti-Co合金的制备与表征（英文）

Highly porous Ti-Co alloy specimens for biomedical applications were synthesized by powder metallurgy based space holder technique. Ti alloys have high melting temperature and affinity for oxygen, which makes Ti alloys difficult to be processed. The Co addition reduces the melting temperature and Ti-Co alloy was sintered at lower temperatures. The electrochemical corrosion behaviour of the specimens was examined in the artificial saliva solution. The effects of Co content of the alloy, the p H value and fluoride concentration of the artificial saliva solution on the electrochemical corrosion properties of the specimens were investigated. The microstructure and mechanical properties of the specimens were examined. The electrochemical impedance spectroscopy results indicate that the corrosion resistance of the specimens decreases at high fluoride concentrations and low p H value. The defect density increases with increasing the fluoride concentration and decreasing the p H value of artificial saliva according to Mott-Schottky analysis.

采用粉末冶金技术添加造孔剂制备生物医学用高孔隙度Ti-Co合金。Ti合金因具有高的熔点和氧亲和力。而难以进行直接加工。添加Co能降低其熔点,因而Ti-Co合金能在更低的温度进行烧结。在人工唾液中考察制备的Ti-Co合金样品的电化学腐蚀行为。研究合金的Co含量、人工唾液的p H值和氟离子浓度升高对样品的电化学腐蚀性能的影响对样品的显微组织和力学性能进行测试。电化学阻抗谱分析结果表明,样品的耐蚀性随氟离子浓度升高和p H值降低而降低。根据Mott-Schottky分析,缺陷密度随氟离子浓度的增加和人工唾液p H值的降低而增加。