Investigation of a wear- and corrosion-resistant coating of the TiCN-Ni-alloy system, obtained by high-speed gas-flame spraying

The structure and properties of high-speed gas-flame (HSGF) coatings of the system TiCr0.14N0.86 - Ni(CrBSi)-alloy (70%) on high-strength cast iron ha ve been studied. The HSGF coatings were deposited on the Struya installatio n at the Institute for Problems of Materials Science, operating on an oxyge n-hydrogen fuel mixture in a nearly stoichiometric ratio. The pressure in t he combustion chamber Mas 0.6 MPa, the gas consumption was 8.5 g/sec, the s prayed powder consumption Mas 2.2 g/sec, the transporting air. consumption Mas 0.5 g/sec. and the spraying distance was 200 mm. The coating was about 1 mm thick with a porosity of less than 2% and had a typical layered struct ure. The alternating zones Mere enriched with a refractory phase or metal. In comparison with the alloy WC (8% Co) the coating herd lower linear wear (<5 mu m/km) and a lower friction coefficient (0.1), and its resistance to high-temperature corrosion Mas almost an order of magnitude higher.