Objective
Chemical analyses capable of producing amorphous structure metallic alloys having the contradictory properties mentioned were defined.
The selection of chemical analyses has resulted from the mechanical characterization of relevant ribbons obtained by planar flow casting on the one hand and by the response to ribbon characterization with regard to corrosion.
The production of powders having the so determined chemical composition to make depositions using the plasma spraying method under controlled atmosphere and temperature has required the use of an atomization tower enabling a fully amorphous grain of 50 um to be obtained, thereby guaranteeing the chemical homogeneity of each grain.
The plasma deposition technique under controlled atmosphere and temperature produces 0.5 mm thick. Depositions over large surfaces having the structure considered.
Optimization and characterization of depositions from the mechanical and tribologic standpoint gave satisfactory results.
Resistance tests of the deposition with respect to corrosion and abrasive erosion were also satisfactory.
An approach for a better understanding of the substrate/deposition bond system was launched but it is not yet completed.
The program targets were fully adhered to and the results are at least equal to the expectations.
Water turbines and hydraulic pumps are susceptible, under operating conditions, to high erosion and cavitation. Such problems can be solved thanks to the mechanical properties of amorphous metal alloy coatings.
For this purpose, we shall coat metal surfaces with alloys cooled at a greater speed and having hardness and ductility values. This method is different from the conventional plasma spraying method widely used in aeronautics in that the temperature of the substrate low.
The first stage of our work will consist in using the existing data on amorphous alloys in order to adapt our chemical analyses to the deposition conditions. The second and third stages will be optimization of deposition parameters an the characterisation of coatings. The various industrial and specific participants have joined their efforts to have a better control of the possible potential offered by the application of these materials.
In this way, after the future industrialisation work, the new materials will be able to meet the ever increasing requirements of the world market in this field.
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.
- agricultural sciences agriculture, forestry, and fisheries agriculture grains and oilseeds
- natural sciences physical sciences plasma physics
- engineering and technology materials engineering coating and films
- engineering and technology mechanical engineering vehicle engineering aerospace engineering aeronautical engineering
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Coordinator
38041 Grenoble
France
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