Objective
Nickel- or cobalt based, wear- and corrosion resistant alloys with or without additional hard phases like WC or Cr3C2 are usually processed by thermal spraying. Subsequently they are remelted to produce dense, porefree coatings with metallurgical bonding to the substrate. Inside surfacing of tubes and casings is not performable in this way. Starting from successful preliminary tests, it is the aim of this RTD project to develop a new coating process.
The technical results of the project can be summarised as follows:
1. All materials with self-fluxing characteristics can be processed, unless they are affected by magnetic fields. Coating quality, structure and hardness are equivalent to those attained by using thermal spraying. The interaction zone between coating and substrate can be limited to a reasonably small width. No special pre-treatment of the substrate surface is necessary except of degreasing and cleaning.
2. The inductive coating process is applicable using needle inductors. However, the application of needle inductors is recommended only, if just a single coating bead is necessary due to a low coating efficiency (protection of edges, cutting tools, inserted blades, etc).
3. Using needle inductors leads to scaling at the rim of the beads and degrades coating quality at overlapping coating lines. In principle the scaling can be avoided by using a protective gas (Ar) shroud.
4. Cylindrical parts are coated with best results employing coil inductors, which guarantee high coating efficiency. Working with protective gas (if necessary) just needs a simple fixture at low gas consumption.
5. Embedding hard particles or solid lubricants is possible with the inductive coating technology. A fine tuning of the optimum coating parameters is still necessary.
6. For coating of large plain areas powder can be supplied before starting the inductive melting process. This leads to high efficiency and avoids scaling of the substrate. However temperature control is difficult and suitable parameters must be tested beforehand.
7. Inside coating of tubes is possible by heating the work piece from outside or by guiding the induction coil in the tube.
8. It is necessary to set the process parameters in relation to the surface temperature of the work piece. Automatic control is possible.
9. The energy consumption is low compared to thermal spraying. Overspray is avoided, therefore powder efficiency is very high.
10. Low noise level, no danger for eye injury, no dust pollution.
Substrate and coating material (selffluxing alloys) are heated and melted resp. by a flat inductive coil. Preferably for big parts (rollings) the one step process will produce crackfree coatings by concentrated and targeted heat input.
Furthermore inside coatings for casings of extrusion screws will be applicable. Important advantages are given by savings in time (one-step-process), energy (concentrated heat input, good efficiency), material (no overspray) and environmental protection (no dust). Different coating materials, additional with carbides, and substrate materials will be investigated and the process optimized by a closed loop control for energy input, traverse speed, powder feeding and inductor development.
First exploitation of results is planned by field tests.
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.
- engineering and technology mechanical engineering tribology lubrication
- natural sciences chemical sciences inorganic chemistry inorganic compounds
- natural sciences chemical sciences inorganic chemistry transition metals
- engineering and technology materials engineering coating and films
- natural sciences earth and related environmental sciences environmental sciences pollution
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
28717 Bremen
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.