氧化铝热浸镀铝膜结晶取向研究  

Crystallization Orientation Relationship of Dip-Coated Al Film on Sapphire

作　　者：毕娜[1] 宁晓山[1] 

机构地区：[1]清华大学 新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《稀有金属材料与工程》2013年第S1期396-399,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51072095;20101301431)

摘　　要：采用热浸镀方法将陶瓷定向移动通过铝熔液,可以形成牢固地粘附在陶瓷表面的铝膜。利用X射线衍射法测定了沿C面切割氧化铝单晶热浸镀铝样品的宏观织构,发现热浸镀铝膜为多晶,和氧化铝C面之间取向多样,并不存在文献报道的低指数晶面异相外延生长关系。由此推断,采用热浸镀工艺之所以能使铝液在氧化铝表面铺展成膜,是由于铝和氧化铝表层氧原子发生化学反应,显著降低界面能所致。Ceramics-aluminum joints have found various practical applications. But Al oxidizes easily. The oxide film formed on the surface of Al impedes the joining of Al to ceramics. A layer of aluminum film can be formed on the ceramics after the ceramics moved unidirectionally through molten aluminum. By measuring the macro-texture of the sample using X-ray diffraction, it is found that Al grows on the surface of C-cut sapphire which expresses that some reaction occurs between Al and sapphire eventhough the hetero-epitaxial growth relationship is not unique. It is concluded that the spreading of Al liquid on alumina during dip-coating originates from the chemical reaction of Al atom with the oxygen atom on the surface of alumina, which can decrease the interface energy extremely.

关 键 词：氧化铝 热浸镀 铝 取向关系 

分 类 号：TG174.443[金属学及工艺—金属表面处理]