作者：TADASHI IKEMOTO;KIYOSHI SAWANO;

作者单位：Technical Development Bureau, Nippon Steel Corporation 20-1 Shintomi, Futtsu-shi, Chiba-ken 293-8511

刊名：Journal of the Technical Association of Refractories

ISSN：0285-0028

出版年：2003-01-05

卷：23

期：3

起页：186

止页：190

分类号：TQ175

语种：英文

关键词：

内容简介

To achieve high durability of the powder line part of ZG SEN refractories, zirconia powder was plasma sprayed on the surface of ZG SEN refractories to form a zirconia film. As a result of the investigation on the relation between the structure of the zirconia film produced and the corrosion resistance to CC powder, the following were clarified: ① In case of the plasma spray application of zirconia powder containing dense and crushed particles, a dense, less porous zirconia film was formed. Because cracks generated in this film after spraying, during the dipping corrosion test, peeling-off of the film occurred and any beneficial effect of the film coating was lost. ② In case of plasma spray application of zirconia powder consisting mainly of hollow particles, a porous zirconia film was formed, and this zirconia film was effective to reduce the wear of ZG SEN refractories by 28 percent. ③ Because the difference between the two spraying powders, it is possible to conclude that the difference in the shape of raw material powder, whether it is closed-packed or hollow, results in the difference in the characteristic of the droplet produced in the plasma flame, whether it is dense or porous. Difference in this characteristic causes differences in the density and porosity of the resulting zirconia film. In a dense zirconia film, many cracks are generated during the cooling process just after the spraying, and the peeling-off of a greater part of the film occurred during the dipping corrosion test. On the other hand, no cracks were generated in the porous zirconia film. As a result, a great difference of the corrosion resistance to the CC powder was observed between both spraying powders.