METHOD AND COMPOSITION FOR BOROCOPPERING IRON-CARBON ALLOYS Russian patent published in 2019 - IPC C23C8/68 

FIELD: technological processes.

SUBSTANCE: invention relates to a method for chemical heat treatment and can be used to increase the operational resistance of articles and process accessories from structural steels and cast irons. Method of borating parts from iron-carbon alloys involves preparing a saturating mixture containing an activator, tin bronze and boron-containing components in the form of boron carbide and granules based on dehydrated boric acid, which are obtained using a mixture containing boric acid and aluminum, then, parts are packed in sealed container and heat treated at 950 °C for 3–5 hours. Preparation of granules based on dehydrated boric acid is carried out using a mixture which additionally contains copper oxide, with the following ratio of components, wt%: boric acid 40, copper oxide 35 and aluminum 25, and said saturating mixture has the following composition, wt%: boron carbide 10–20, granules based on dehydrated boric acid 30–50, tin bronze 10–15, activator 2 and aluminum oxide – balance.

EFFECT: obtaining single-phase boride coatings with maximum hardness in the near-surface layer HV 1,700–1,800, high plasticity of the surface layer, which is susceptible to grinding or processing by the cutter without destroying the boride coating.

1 cl, 2 dwg