METHOD OF HIGH-TEMPERATURE MULTILAYER COMPOSITE ON METAL SURFACE PRODUCING Russian patent published in 2016 - IPC C23C4/06 C23C4/129 C23C24/08 

FIELD: metallurgy.

SUBSTANCE: invention relates to metal science, chemical-thermal treatment of metal articles, to production of structural purpose nano-structured materials, to friction and wear problem, and can be used for machines parts durability increasing in any industry. Method of producing high-temperature multilayer composite on metal part surface using HVOF involves surface treatment with HVOF in shielding atmosphere of preliminarily mechanically activated NiAl powder with shape memory effect to produce layer with thickness of 120-500 mqm with further plastic deformation at heating below temperature of martensitic transformation beginning, production of high-temperature layer by HVOF in shielding atmosphere of preliminarily mechanically activated mixture of Si, Y, BN, C, Co, Ni₃Al powders, with their ratio wt%: Si 4-13, Y 2-3, BN 12-20, C 2-8, Co 3-10, Ni₃Al is rest, with thickness of 150-500 mqm. It is followed by heating at temperature of 30-35 °C above solidus followed by ageing in two stages. At first stage performing heating to temperature of 1,000-1,100 °C with holding for 1-1.5 hours, at second stage is heating to temperature of 900-950 °C with holding for 2.5-3 hours. As shielding atmosphere in HVOF argon is used.

EFFECT: enabling higher heat-resistant characteristics, process time and costs reducing.

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