Modification of the Tribocouplings by Spraying Metal Coatings to Improve Their Fretting Resistance

Resumo

Test results of model tribocouplings with friction surfaces modified by gas-thermal evaporation of copper-containing coating, which owing to friction interaction is transferred to the opposing surface of a counterface, thus mitigating shearing strains in the soft surface layer and preventing seizure of the friction solids/ bodies, are presented in the study. Tribotechnical tests were performed, and friction coefficient η and wear coefficients C of coupling materials both in normal conditions and at high (250°С) temperatures were determined. Application of similar coatings for increasing the working life of full-scale tribocouplings operating in the fretting mode in an aggressive medium at high temperatures is expected.