Pre-treatment

PVD pre-treatment

Pre-treatment is particularly important where coating is concerned. While 20 years ago the first PVD coatings were still applied to only cleaned surfaces, there are now a number of other possibilities.

Using defined pre-treatment methods, it is possible to influence more than just the adhesion of the coating. Optimization of the state of stresses in the ground surfaces and the microgeometry in certain tools are only two examples.

Machining tools have worked in various types of surface treatment before they arrive here for coating. While shaft tools are typically connected with ground surfaces, we find that indexable inserts are used for very varied surface conditions. For example, sintered, brushed and radiated surfaces may be present as well as the odd problem that can be eliminated through selection of the appropriate pre-treatment.

CVD diamond pre-treatment

Diamond coatings are currently used exclusively on hard metal substrates. The selection of a suitable hard metal is extremely important to the end result. CemeCon prefers to specify suitable substrates in conjunction with the manufacturers of hard metals. An overview of these substrates is provided.

The individual pre-treatment steps are selected according to the hard metal selected and the later use of the tool. A combination of mechanical and chemical processes ensures excellent mechanical adhesion of the coating to the tool.