Formation of Metal Film on Ceramics Surface by Using Oxy-sulfide Melts

陶瓷和金属物质之间的几种接合方法已经被开发并用于电子器件的板和封装材料。非金属陶瓷与金属之间的结合有很大的困难。由于缺乏润湿性，金属熔体几乎不会淹没在陶瓷表面上。本研究的目的是通过硫氧化物熔体在陶瓷表面扩散，在陶瓷表面形成均匀的金属膜。氧硫化物被氢气还原后，经涂敷陶瓷后转化为金属膜，实验分为两部分，一部分是制作Fe-S-O氧硫化物体系的相稳定性图，了解其熔化温度和分解条件，另一部分是金属膜的形成和结合结构的观察。从相稳定性图中选择了24%S-9%O-67%Fe的合适成分，并用于制备金属膜。硫氧化物熔化后直接铺展在氧化铝陶瓷表面，然后被还原成铁膜，但金属与氧化铝之间没有达到足够的结合强度。为了获得强度，氧化铝表面首先被与氧化铝反应的CaO-FeO-Fe_2O_3熔体覆盖，然后扩散氧硫化物。双层膜经氢还原后，形成的铁膜被牢固地固定。金属膜的厚度取决于硫氧化物的量、硫氧化物在陶瓷表面铺展的温度和时间。用该方法还从Ni-Fe-S-O氧硫化物制得了具有抗氧化性的20%Ni-80%Fe合金膜。

Several bonding methods between ceramics and a metal substance have been developed and utilized for plates and packaging materials of electronic devices. We have great difficulty in bonding between non-metallic ceramics and metal. A metallic melt hardly floods on a ceramics surface for lack of wettability. Objective of the investigation is a development in making a homogeneous metal film fixing on ceramic surface through oxy-sulfide melt that spreads the surface. The oxy-sulfide is reduced by hydrogen gas and converted into metal film after spreading ceramics.Experiment for the investigation consists of two parts ; one is for making phase stability diagrams of the Fe-S-O oxy-sulfide system to know the melting temperature and the decomposition condition, the other is forming of the metal film and observing the binding structure. The suitable composition of 24 % S-9 % O-67 % Fe has been chosen from the phase stability diagrams and employed to making the metal film. The oxy-sulfide was melted and spread directly on the surface of alumina ceramics and then reduced to iron film, but sufficient binding strength between the metal and alumina was not reached. In order to get the strength alumina surface was initially covered with CaO-FeO-Fe_2O_3 melt that reacted with alumina and then the oxy-sulfide was spread. After hydrogen reduction of the double layers, the forming iron film was firmly fixed. Thickness of the metal film depends on amount of oxy-sulfide, temperature and time of spreading the oxy-sulfide on ceramic surface. Alloy film of 20 % Ni-80 % Fe having oxidation resistance was also made from the Ni-Fe-S-O oxy-sulfide in this method.