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获得基础数据。采用离子注入、电镀和混合技术。离子注入显著提高了材料的耐蚀性。注入后经退火形成超晶格结构。然而，植入表面粗糙是一个问题。离子镀使镀层表面均匀，提高了强度和耐蚀性。采用离子混合技术，可以同时使用离子注入和离子镀，效果最好。这种方法的另一个优点是可以控制表面改性的厚度。在本研究中，我们还讨论了CuAu - I的有序机制，在牙科金合金中，CuAu - I的形成可以通过表面改性后的退火来实现。排序分三个阶段进行（第一、第二和第三阶段）。阶段I对应于通过迁移和湮灭对被淬灭的过剩空缺进行排序。此订购阶段将适用于离子混合处理样品，因为可以在室温下进行。

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.