| 摘要 |
In a laminar material or workpiece comprising a functional layer applied to a surface of a solid support layer and composed of mutually insoluble components which normally form a heterogenous structure, a fine dispersion of the undissolved components in a matrix of the functional layer is obtained by forming a powder, a powder agglomerate or a pre-dispersed powder from the components of the functional layer by air plasma injection and by applying it to the support layer. The support layer also comprises a partial layer to be coated having a heterogeneous or crystalline structure, for example a lead/bronze layer or lead/tin/bronze layer. A restricted surface region of this partial layer is continously melted to a given depth, for example 20 to 200 mu m, by the action of a plasma flame while the functional layer is formed from the finely powdered material over and around this melt. The surface regions of the partial layer and the functional layer are then immediately cooled at a rapid cooling rate and solidified to form dispersed or finely dispersed layers. An adhesive layer can also be applied between the partial layer and the functional layer, preferably by air plasma jet, in order to achieve the desired structural transformation in the surface regions of the support layer. |
