钛合金表面原位生成钛酸钾生物陶瓷涂层的制备及其生物相容性

Fabrication and Bio- compatibility of K_2Ti_6O_(13) Bio-ceramic Coating on the Surface of the Titanium Alloy TiAl_xZr_(x-4)Sn_(x-3.5)Nb_(x-4.5)

摘要:

采用原位干混合煅烧合成法在钛合金基体上成功制备了K2Ti6O13涂层，并对涂层的微观形貌、相组成、涂层-基体的结合强度进行了研究，通过模拟体液实验对其生物活性进行了评估。结果表明，涂层与基体间结合牢固，能够经受空冷条件下的冷热冲击，热膨胀系数的良好匹配是结合强度提高的主要原因。涂层粗糙的表面和气孔可为骨的向内生长提供有利位置。经模拟体液浸泡，涂层表面形成了钙磷比接近人体骨骼的钙磷层，表明涂层具有良好的生物活性。

Abstract:

A K2Ti6O13 bio ceramic coating on the surface of titanium alloy TiAlxZrx- 4Snx- 3.5Nbx- 4.5 was prepared by using an in situ kneading drying calcination synthesis technique. During emersion in a simulated body liquid the microstructure, composition of phases, bonding strength between the coating and matrix, and the bio activity of the coating were evaluated. The test results indicated that the bond strength between the coating and the matrix was high enough to resist cool and hot impact during air cooling mainly as a result of the good thermal expansion match between the coating and the matrix. Rough surfaces and small holes on the Ti alloy coating provided sites for simulated bone attachment. Soaking of the coated alloy in a simulated body liquid, encouraged the active formation of a Ca P layer with a ratio of Ca and P appropriate to human bone .