Feasibility of producing intermetallic compound coatings from mechanical mixtures by flame-spraying
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The probability of intermetallic compounds being formed during the flame-spraying of composite aluminum-nickel mixtures does not exceed 20%. With the existing standard installations, it is impossible to surpass this limit merely by varying process parameters. Separate supply of the components only slightly increases the adhesional strength of coatings. The results obtained lead to the conclusion that utilization of the energy of exothermic reactions cannot be expected to increase the adhesional strength of coatings produced from mechanical composites. Use of mechanical composites may prove to be justified in the spray-deposition of P/M coatings where an increase in adhesional strength is achieved as a result of a lowering of the level of residual stresses in a soft metallic matrix.
KeywordsResidual Stress Intermetallic Compound Adhesional Strength Exothermic Reaction Mechanical Mixture
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