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钛合金表面涂覆羟基磷灰石 (HA)用作硬组织植入体 ,既有优良的力学性能 ,又有优良的生物相容性 ,是材料学和生物医学中的研究热点。基于CaCO3 +CaHPO3 ·2H2 O在高温下能反应生成羟基磷灰石 ,以及激光熔覆技术能够制备与基体材料结合良好的陶瓷涂层的事实 ,尝试了利用激光处理在钛合金表面同步合成与熔覆羟基磷灰石生物陶瓷涂层的新技术。实验表明 ,以 80CaCO3 2 0CaHPO3 ·2H2 O ,另加 1%Y2 O3 为原料 ,在功率密度 13～ 15W/mm2 ,扫描速度 6 30mm/min的处理条件下 ,在TC4钛合金表面成功地制备出以羟基磷灰石为主的、具有梯度特征的生物陶瓷涂层。该涂层由表及里钙含量逐渐减少 ,钛、钇递增 ,磷则是先增加后减少 ;致密度由表及里呈现出逐步提高的特征 ;显微硬度则逐渐降低
Hydroxyapatite (HA) coated titanium alloy surface is used as a hard tissue implant, both excellent mechanical properties, but also has excellent biocompatibility, material science and biomedical research hot spots. Based on the fact that CaCO3 + CaHPO3.2H2O can react to form hydroxyapatite at high temperature and laser cladding technology can prepare a ceramic coating which is well bonded with the matrix material, attempts have been made to utilize laser processing to synthesize and melt New Technology of Hydroxyapatite Bioceramic Coating. The experimental results show that 80CaCO3 2 0CaHPO3 · 2H2O and 1% Y2O3 are successfully prepared on the surface of TC4 titanium alloy under the conditions of the power density of 13-15W / mm2 and the scanning speed of 6-30mm / min Hydroxyapatite-based, gradient ceramic bio-coating. The coating is gradually reduced from the table and the content of calcium, titanium, yttrium increased, phosphorus is the first increase and then decrease; density showed a gradual increase from the table features; microhardness decreased