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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。
Preparation of Biomedical High Porosity Ti-Co Alloy by Powder Metallurgy with Pore Forming. Ti alloy because of its high melting point and oxygen affinity. And difficult to direct processing. The addition of Co reduces its melting point, so Ti-Co alloys can be sintered at lower temperatures. The electrochemical corrosion behavior of prepared Ti-Co alloy samples was investigated in artificial saliva. The effect of the Co content, the pH value of artificial saliva and the fluoride ion concentration on the electrochemical corrosion behavior of the samples was investigated. The microstructure and mechanical properties of the samples were tested. The results of electrochemical impedance spectroscopy showed that the corrosion resistance of the samples decreased with the increase of fluoride concentration and the decrease of p H value. According to the Mott-Schottky analysis, the defect density increases as the fluoride ion concentration increases and the pH value of artificial saliva decreases.