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采用爆炸喷涂与等离子喷涂两种工艺复合制备羟基磷灰石生物活性梯度涂层人造齿根。基体为Ti-6A1-4V,具有优良的综合力学性能及生物相容性;涂层厚度为100～150t-tm,主要成分为羟基磷灰石。涂层的底层和中间层采用爆炸喷涂工艺制备,结合强度高,结构致密,孔隙率小于2％,无连通孔隙,可防止生物液体沿连通孔隙渗透至基体界面,造成界面腐蚀及涂层脱落。涂层的表面层采用等离子喷涂工艺制备,可在致密中间层的基础上获得孔隙率为20～30％、厚度为40/~m左右的多孔结构表面层,具有极好的生物活性,有利于生体组织的长入及材料与生体组织的生物结合。经X—射线物相分析,证实涂层的主晶相为羟基磷灰石;对喷涂后的涂层材料进行适当后处理可使喷涂过程中失掉的羟基恢复。对涂层横截面进行SEM显微结构形貌观察,发现涂层具有从基体处的致密结构至涂层表面疏松结构的梯度分布。这种结构有利于涂层与基体结合强度的提高及涂层与基体组织的生物结合。该材料涂层结合强度可达50～60MPa,高于国内外同类材料性能指标。
The dermabrasion and plasma spraying were used to prepare the hydroxyapatite bioactive gradient coated artificial tooth root. The substrate is Ti-6A1-4V, which has excellent comprehensive mechanical properties and biocompatibility. The coating thickness is 100-150t-tm, and the main component is hydroxyapatite. The bottom layer and the middle layer of the coating are prepared by the explosive spraying process. The bonding strength is high, the structure is compact, the porosity is less than 2%, and the non-communicating pores prevent the biological liquid from penetrating into the interface of the matrix along the communicating pores, resulting in interface corrosion and coating falling off. The surface layer of the coating is prepared by the plasma spraying process, and the porous structure surface layer with the porosity of 20-30% and the thickness of 40 / ~ m can be obtained on the basis of the dense intermediate layer, which has excellent biological activity and is favorable to The growth of biological tissue and the biological binding of material and biological tissue. X-ray phase analysis showed that the main phase of the coating was hydroxyapatite. Appropriate post-treatment of the sprayed coating material could restore the hydroxyl groups lost in the spraying process. The microstructure of the coating was observed by SEM. The coating was found to have a gradient distribution from the dense structure at the substrate to the loose structure of the coating surface. This structure is conducive to the coating and the substrate to improve the bonding strength and the substrate with the coating of the biological combination. The material coating bonding strength of up to 50 ~ 60MPa, higher than similar materials at home and abroad performance indicators.