钛合金表面K_2Ti_6O_(13)w涂层的制备及其生物活性(英文)

Preparation of K_2Ti_6O_(13)wcoating on Ti alloy and its bioactivity

K2Ti6O13晶须不仅具有优越的力学性能和良好的生物学特性,而且具有与常规Ti合金相近的膨胀系数。本研究尝试选用K2Ti6O13晶须(K2Ti6O13w)作为生物活性涂层材料,利用BCC方法(混合-包埋-煅烧)在Ti合金基体上成功制备了K2Ti6O13w涂层,并对涂层的表面形态、结合强度和生物活性进行了研究。结果表明,涂层由K2Ti6O13晶须和少量的TiO2和K2Ti4O9组成,其表面粗糙多孔。由于膨胀系数的良好匹配,涂层与基体之间具有较高的结合强度,达24MPa。模拟体液培养后,涂层表面沉积了一层多孔的骨状羟基磷灰石,它由平均直径20nm,长200nm的羟基磷灰石纳米线组成,这表明钛酸钾涂层具有良好的生物活性。涂层较高的生物活性与其独特的生化特性和组分密切相关。

Potassium hexatitanate whisker （K2 Ti6 O13 w） has excellent mechanical properties and good biological features as well as similar expansion coefficient to conventional titanium alloys. In this study, the authors attempt to select K2Ti6O13 whiskers as bioactive coating material, and K2 Ti6 O13 w coating was successfully fabricated on titanium alloy substrate by BCC（blending-cladding-calcination method）. The morphology, bonding strength and bioactivity of the coatings were also investigated. The results show that the coating consists of K2Ti6O13 whiskers and a small amount of TiO2 and K2Ti4O9 with a rough and pore-rich surface,having a high bonding strength of 24MPa due to the suitable match of expansion coefficients between the coating and the substrate. After soaking in simulated body fluid （SBF）, a porous bone-like hydroxyapatite （HA） layer, being composed of worm-like nano-HA wires with an average diameter of 20nm and length of 200nm, is formed on the surface of the coating, which indicates that potassium titanate coating possess good bioactivity. The high bioactivity of the coating is closely related to its unique biochemical characteristics and components.