| 摘要 |
According to the present invention there is provided a body at least partially coated with one or more refractory layers of which at least one layer essentially consist of a fine grained kappa -Al2O3. Said kappa -Al2O3 layer consists of essentially equiaxed grains with an average grain size of <0.5 mu m. The Al2O3 layer further comprises at least one sublayer containing Al, Si and O. This particular fine grained kappa -Al2O3 microstructure is obtained by periodically introducing a silicon halide, preferably SiCl4, during the Al2O3-process. <IMAGE> |
