Objective
Content of the project is surface hardening by means of diamond coating.
To enable the SME's which participate in this project to share the market in selling high qualitative cutting tools the deposition chamber system DIC-2 has been designed, constructed and built.
Additionally a new technique for the deposition of diamond and DLC-layers has been developed and introduced. This technique is based on a modified acetylene-flame CVD which uses additional plasma supported PVD for coating superhard material on cutting tool surfaces. The deposition conditions for diamond and DLC coatings on cutting edges and other tools have been studied in a wide range of coating steps, which are necessary for a successful deposition of diamond.
Practical surface investigations (on adhesion strength, layer thickness, on surface topography with Atomic Force Microscope (AFM) and SEM, on chemical structure with RAMAN analysis) and cutting tests (tool wear) with coated tungsten carbide inserts have run parallel to the optimisation of the coating process, in order to enable inferences to be drawn for interpretation of the process (temperature, duration, gas activation etc). This feedback of the test results to the coating process was of high importance with regard to the specific cutting process demands like improved adhesion, layer thickness, homogeneity and surface roughness, of the coated inserts.
The experimental tests performed show that diamond/DLC-coated inserts used for cutting operations could not deliver the expected performance. Only two charges show a satisfactory result. The Raman-analysis documents that there are diamond-like structures on the inserts. But it was impossible to reproduce these good coating results. The aim of the programme, the development of a controllable coating process for diamond coating was not reached during the project duration. Due to the problems with the adhesive strength of the layers the cutting tests with most of the inserts just provide information about the flank wear of the substrate material. The strong contamination with carbon on the layer leads to irregular structures of the layers. The adhesive strength is not guaranteed. It can be noticed that up to date this coating process does not produce satisfying layers, and has to be improved in the near future by further investigations.
Specific fields of use are :
- Cutting tools for use in UP (Ultraprecision) technology
-Cutting tools for use in macrocutting
- Probing/touching heads in fine measuring techniques
- Highly wear-resistant machine elements etc.
Because of its extreme hardness combined with chemical stability and excellent thermic conductivity, diamond is, of the known material, an ideal substance for wear-reducing coatings.
For the process the acetylene flame CVD is proposed. This process offers the expectation that coating depths in the nanometer range as well as those with a higher removal rate are possible. The required expenditure for this process is relatively low. It has the potential of making it possible for small and medium-sized firms to produce the tools described in the following. A specific feature of the process is that its limitation to small surfaces does not conflict with the selected uses. The high temperatures regarded up till now as necessary can be avoided in the selected uses through the choice of tool materials.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences chemical sciences inorganic chemistry transition metals
- natural sciences physical sciences astronomy planetary sciences planetary geology
- natural sciences physical sciences optics microscopy
- engineering and technology materials engineering coating and films
- natural sciences chemical sciences organic chemistry aliphatic compounds
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Coordinator
71563 Affalterbach
Germany
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.