Multi-component nitrated ion-plasma Ni-Cr coating

Abstract

Method for ion-plasma deposition is applied for covering of heat-resistant Ni-Cr alloy XH78T. Coating deposition is performed under nitrogen gas atmosphere at the pressure from 3×10^-5 to 1×10^-2 Torr. The nitrogen content in the coating is reached up to 2,7 %. Nitrated coatings with a thickness of 184-222 μm is obtained without embrittlement and with a uniform distribution of microhardness. The effect of the nitrogen pressure in a vacuum chamber on the structure of the coatings, which changes from homogeneous to columnar with conical crystallites, is presented. Nitration increases microhardness of the coatings from 3669 to 7575 HV, the wear resistance of the coatings increases by 6-8 times. The received coatings can be used to increase the durability of metallurgical equipment parts.