METHOD FOR OBTAINING AN ANTI-FRETTING COATING Russian patent published in 2022 - IPC C23C28/00 C23C14/16 C23C14/24 

FIELD: ion-plasma coatings applying technologies.

SUBSTANCE: invention relates to technologies for applying ion-plasma coatings, and in particular to a method for surface treatment of a titanium alloy product to obtain an anti-fretting coating. Preliminary preparation of the product surface is carried out, the product and conductive material made of titanium alloy alloyed with aluminum and chromium are placed in the processing zone located in the working chamber of the ion-plasma spraying installation. A vacuum is created in the processing zone, the final preparation of the product surface is carried out by bombardment with inert gas ions. A negative potential is applied to the product and separately to the conductive material, a vacuum arc is excited on the conductive material, burning in the vapors of this material to form a plasma. The surface of the product is cleaned by bombardment with ions of a conductive material. The accumulation and diffusion of ions of the conductive material on the surface of the product is carried out in stages at a negative potential on the product at a surface temperature of the product below the softening temperature of the titanium alloy from which the product is made. At odd stages, accumulation and diffusion are carried out at a pressure in the working chamber of ≤ 0.13 Pa and a negative potential on the product from 10 to 15 V, and at even stages, nitrogen reaction gas is supplied to the working chamber to a pressure of 0.13 to 0.4 Pa at a negative potential on the product from 95 to 105 V. As a result of the operations carried out, a coating of the TiAlCr-(TiAlCr)N system is obtained. Finishing treatment of the surface of the product is carried out by applying a solid lubricant to it, followed by heat treatment of the surface at a temperature of 195 to 205°C for a period of 55 to 65 minutes.

EFFECT: fretting resistance of a titanium alloy product at a temperature of 500°C is provided, while maintaining its heat resistance.

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