| 摘要 |
<p>According to the present invention, if the outermost ceramic coating layer is a ?-Al<SUB>2</SUB>O<SUB>3</SUB> coating layer, then certain microns of the ?-Al<SUB>2</SUB>O<SUB>3</SUB> layer will be transformed into an a-Al<SUB>2</SUB>O<SUB>3</SUB> by the instantaneous melting, vaporization and solidification. Further, according to the present invention, if the outermost coating layer of the ceramic coating layers is an a-Al<SUB>2</SUB>O<SUB>3</SUB> coating layer, then the surface roughness will be enhanced since at least a portion of it will be melted, wherein the melted surface will be solidified with its surface flattened by the surface tension provided in a melted state.</p> |
