Surface Modification in Dental Alloys by Ion Engineering

本工作的目的是为在牙科合金中引入离子工程技术提供基础数据。采用了离子注入、电镀和混合技术。离子注入显著提高了涂层的耐蚀性。注入后通过退火形成了超晶格结构。然而，注入表面是否粗糙是一个问题。离子镀获得了均匀的涂层表面，提高了涂层的强度和耐蚀性。离子混合技术效果最好，相当于离子注入和离子镀同时使用。这种方法还有一个优点，那就是我们可以控制表面改性的厚度。在本工作中，我们还讨论了CuAuI的有序化机制，这种有序化的形成是在牙科金合金表面改性后的退火过程中进行的。排序分三个阶段进行(第一、第二和第三阶段)。第一阶段对应于淬火过剩双空位的迁移和湮灭有序化。由于可以在室温下使用，离子混合处理样品也可以使用这种排序阶段。

The purpose of the present work is to obtain fundamental data for introducing ion engineering techniques in dental alloys. Ion implantation, plating and mixing techniques were employed. Ion implantation improved remarkably the corrosion resistance. A superlattice structure was formed by annealing after the implantation. However, it is a problem for the implantation surface to have rough surface. Ion plating produced a homogeneous coating surface and improved the strength and corrosion resistance. We got best results by ion mixing technique, which corresponds to use at the same time ion implantation and ion plating. This method has an additional merit which we can control the thickness of surface modification. During the present work, we also discuss the ordering mechanism in CuAu I,the formation of which is expected by annealing after the surface modification in dental gold alloy. The ordering proceeded in three stages (I,II and III). Stage I corresponds to the ordering by migration and annihilation of quenched-in excess divacancies. This ordering stage will be available on ion mixing treatment sample, because of be possible at room temperature.