FORMING A HARD LAYER ON A SUBSTRATE

摘要

A method of forming a hard layer on a substrate comprises rubbing particles of a suitable source material across the surface of the substrate at a high speed and under sufficiently high pressure to cause a hard layer to form on the surface. The source material typically comprises a hard metal carbide, or a material containing diamond and boron nitride. A mop of carbon fibre rotating at a speed of about 15 000 rpm is held against a substrate such as polished stainless steel, with a slight interference between the periphery of the mop and the substrate. Particles of source material are applied to the interface between the mop and the substrate, and the substrate is traversed relatively to the mop until a coating of the source material builds up on the surface of the substrate. The substrate can be moved back and forth underneath the mop, or can be moved uni-directionally relative to the mop.