Developing the technology of friction alitising

Finishing anti-friction non-abrasive treatment (FANT) is one of the highly effective methods of increasing tribotechnical properties of parts (wear resistance and scoring resistance). The lack of highly effective technological media and devices for treating parts, as well as low corrosion resistance of the applied copper-containing coatings restrains the use of FANT. The technology of friction alitising, proposed by the authors, consists in the application of an aluminum-containing protective coating by friction, through the use of an aluminum rubbing tool and the developed technological medium, which includes aluminum salts. The technical alloy of AD1 grade GOST 4784-97, consisting of 99.3% Al, Fe – 0.3%; Si – up to 0.3%; Ti – not more than 0.15%; Zn – up to 0.1%; Mg – not more than 0.05%; Cu – up to 0.05%; manganese Mn – not more than 0.025% and impurities – up to 0.05% was chosen as a material of the rubbing tool. Cylindrical samples were used as the treated part during the elaboration. The technological medium developed by the authors includes salts of copper, tin and nickel, glycerine, glucose and water with additional content of aluminum salts. It has been established that qualitative friction alitising should be carried out in 3 to 4 passes at a sliding speed of the rubbing tool of 0.1 to 0.3 m/s and pressure of the rubbing tool within 5 to 7 MPa. For mass production, the technological process of alitising should include the following operations: cleaning before processing, defecting, friction alitising, cleaning after processing, quality control of coating and preservation of the part – if necessary for long storage.

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