Rieu J
Ecole Nationale Supérieure des Mines, St-Etienne, France.
Clin Mater. 1993;12(4):227-35. doi: 10.1016/0267-6605(93)90077-k.
Surface transformations can be performed on metals in order to combine their load-bearing properties to the inertness and wear resistance of ceramics. In a joint prosthesis, metals are useful for their high fatigue strength and ductility, but they are more sensitive to superficial corrosion and wear than ceramics. Coating a ceramic on metal surface will improve the qualities of the metallic component. The various ways of transforming a metallic surface into a ceramic one are described. First, the surface treatments to improve the friction and wear properties are analysed. Coatings and surface transformations give superficial inert compounds. Many techniques are used to create hard, corrosion resistant layers on the surface. The processes may involve heating of the treated parts. But some metals cannot be heated without an alteration of their mechanical properties. The adhesion strength--and thus, the lifetime--of the ceramic layers depend on the binding forces and on the structure of the interfaces between the bulk metal and the outermost ceramic. Coatings generally have a lower adhesion strength than in-situ formed phases and the risk of peeling is higher. Second, the plasma-sprayed coatings performed to improve the bone anchorage are described. This review does not deal with bioactive materials. So, only the alumina coatings and their mechanical compatibility advantage are present.
可以对金属进行表面处理，以便将其承载性能与陶瓷的惰性和耐磨性结合起来。在关节假体中，金属因其高疲劳强度和延展性而有用，但它们比陶瓷更容易受到表面腐蚀和磨损。在金属表面涂覆陶瓷将改善金属部件的性能。本文描述了将金属表面转变为陶瓷表面的各种方法。首先，分析了改善摩擦和磨损性能的表面处理。涂层和表面处理会产生表面惰性化合物。许多技术用于在表面形成坚硬、耐腐蚀的层。这些过程可能涉及对处理部件进行加热。但有些金属在不改变其机械性能的情况下无法加热。陶瓷层的粘附强度以及寿命取决于结合力以及块状金属与最外层陶瓷之间界面的结构。涂层的粘附强度通常比原位形成的相低，剥落风险更高。其次，描述了为改善骨锚固而进行的等离子喷涂涂层。本综述不涉及生物活性材料。因此，仅介绍氧化铝涂层及其机械相容性优势。
