Al_2O_3泡沫金属复合陶瓷的制备及表面包镍处理

Preparation of Nickle-adulterated Foam Ceramics and Nickle-coated on its Surface

采用有机泡沫前驱体浸渍工艺制备Al2O3泡沫金属复合陶瓷。通过涂覆处理获得缺陷较少、结构均匀的泡沫金属复合陶瓷;采用Ni(NO3)2·6H2O液相包覆+氢气热还原技术对泡沫金属复合陶瓷体表面进行金属化处理。采用SEM、EDS研究了含镍泡沫陶瓷体的结构及金属化处理后的表面形貌。结果表明,镍颗粒均匀地分布在泡沫陶瓷骨架内部,骨架中心宏观孔保持通孔;经包覆处理后,金属层较均匀地附着于陶瓷表面。

The open cell Nickle-adulterated alumina foam ceramics were prepared by impregnating a polymeric sponge with aqueous ceramic slurry. The Nickle-adulterated alumina foam ceramics with a very uniform macrostructure and few flaws were produced by recoating process. A nickelousnitrate liquidphase coating and deoxidized by hydrogen method was used to deposit Ni on the surface of Ni-adulterated alumina foams. Coating morphology and microstructure of the foam ceramics were observed by SEM （scanning electron microscope） and EDS （energy dispersed spectrometer）. The results indicate that Ni particles are distributed uniformly in the foam skeleton and pores in the sintered body exhibit interconnected. Furthermore, Ni is successfully coated on alumina foams surface after coating process.