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为了提高医用镁合金的表面耐蚀性和生物相容性,采用激光技术在镁合金表面制备羟基磷灰石(HA)涂层。研究主要采用如下两种方法制备HA涂层:激光熔覆法;等离子喷涂+激光重熔法。研究结果表明,由于镁合金和HA的物化差异较大,采用激光熔覆法所制备的涂层为不连续的泪珠状,成型非常困难,涂层中镁稀释较大,严重影响涂层的耐蚀性和生物相容性;然而采用等离子喷涂+激光重熔处理则较易在镁合金表面制备HA涂层,涂层连续且无剥落,相组成为生物相容性较好的HA和少量的Ca_3(PO_4)_2(TCP),涂层表面存在一些有利于骨长入的裂纹和孔隙。所以,采用等离子喷涂+激光重熔能够在医用镁合金表面制备生物相容性和耐蚀性较好的HA涂层。
In order to improve the surface corrosion resistance and biocompatibility of medical magnesium alloys, hydroxyapatite (HA) coatings were prepared on the surface of magnesium alloy by laser technique. The research mainly adopts the following two methods to prepare HA coating: laser cladding method; plasma spraying + laser remelting method. The results show that due to the large difference between the physicochemical properties of magnesium alloy and HA, the laser cladding method for the preparation of the coating is not continuous teardrop shape, the molding is very difficult, the coating dilution of magnesium is larger, seriously affecting the resistance of the coating Corrosion and biocompatibility. However, plasma spraying and laser remelting are easier to prepare HA coating on the surface of magnesium alloy. The coating is continuous and free from flaking. The phase composition is HA with good biocompatibility and a small amount of HA Ca_3 (PO_4) _2 (TCP), there are some cracks in the coating surface and the long cracks in the pores and porosity. Therefore, the use of plasma spray + laser remelting can be prepared on the surface of medical magnesium alloy with good biocompatibility and corrosion resistance HA coating.