| 摘要 |
A body is at least partially coated with one or more refractory layers of which at least one layer is of a finegrained kappa-Al2O3. Said kappa-Al2O3 layer has equiaxed grains with an average grain size of <0.5 mum. The Al2O3 layer also has at least one sublayer containing Al, Si and O. The finegrained kappa-Al2O3 microstructure is obtained by periodically introducing a silicon halide, preferably SiCl4, during the Al2O3-process.
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