医用钛合金的发展及研究现状

Development and research status of biomedical titanium alloys

纯钛及其合金以其与骨相近似的弹性模量、良好的生物相容性及在生物环境下优良的抗腐蚀性等在临床上得到了越来越广泛的应用.综述了医用钛合金的发展和研究现状,阐述了钛的生物相容性原理,同时简单评述了钛及其合金表面改性与钛基复合材料的研究现状.分析表明:纯钛及其合金具有出色的生物相容性主要归功于表面附着的氧化层;β型钛合金与α/α+β型钛合金相比,具有较高的耐磨性,是一种很有前途的外科植入用钛合金;寻求更为理想的表面改性工艺从而获得高质量的涂层,或将生物活性相添加进钛合金基体中制备成复合材料是提高医用钛合金生物活性的两种有效途径.

Due to their similar elastic modulus to bone,excellent biocompatibility and corrosion resistance in biological environment,pure titanium and its alloys have been widely used in clinic.The development and re-search status of the biomedical titanium alloys was reviewed in this article with the illumination of biocom-patibility mechanism of titanium.In addition,the research status of the surface modification of titanium alloys and their composites was discussed briefly.The excellent biocompatibility of pure titanium and its alloys owes to the oxide layer on their surfaces.Due to its better wear resistance than that ofα/α+βtitanium,βtitanium is considered as a promising material as the orthopedic implants.To enhance the bioactivity two effective ways are expected.One is to seek a more perfect surface modification technology for obtaining high quality coatings,and the other is to fabricate a composite by incorporating bioactive phases into titanium alloys.