| 摘要 |
<p>The invention relates to a method for thermochemical diffusion treatment for a mechanical element of an internal combustion engine made of steel, in particular a valve lifter (7) of a valve (3), including: a step of oxynitrocarburising the surface of the steel, followed by a step of polishing the surface, for example by brushing the steel. The invention also relates to a mechanical element of a steel internal combustion engine, for example a valve lifter (7) of a valve (3), including, on the surface, a layer comprising iron nitrides and a surface layer of iron oxide Fe3O4.</p> |
