METHOD OF OBTAINING CERAMIC COATINGS ON DETAILS FROM STEELS Russian patent published in 2017 - IPC C23C28/00 

FIELD: chemistry.

SUBSTANCE: method involves chemical preparation of the surfaces of parts, fluxing in the melts of chlorides of alkaline and alkaline earth metals at a temperature of 700…800°C, liquid aluminizing in the melt of electrical aluminium at a temperature of 730…760°C followed by cooling to a temperature of 200…300°C, oxidation and heating in three steps with an exposure of 3…5 min - first up to 260…270°C, then to 460…470°C and further up to 620…640°C, with the details oxidized in the anode-cathode microarcode mode 20…25 min at a current density of 15…20 A/dm² In a solution containing caustic potassium 4…6 g/l with low-modulus liquid glass 4…6 g/l or caustic potassium 6…8 g/l with boric acid 30…50 g/l, as well as fine-grained corundum 40…60 g/l and chromium oxide 1…2 g/l, when oxidizing the parts connected to one output of the current source, translational and rotational movements are reported, and on their processed surfaces, through stainless steel diffusers connected to the opposite output of the current source, oxygen is supplied under pressure at a temperature of 5…15°C and sonicated.

EFFECT: method allows to increase hardness, wear resistance and electrical resistivity of coatings.

4 dwg, 2 tbl, 1 ex