METHOD FOR BORIDING PARTS FROM IRON-CARBON ALLOYS Russian patent published in 2016 - IPC C23C8/70 

FIELD: technological processes.

SUBSTANCE: invention relates to a method for chemical thermal treatment and can be used for increasing operational resistance of articles and production tools from iron-carbon alloys. Method of borating parts from iron-carbon alloys comprises preparing saturating mixture containing an activator and boron-containing component in the form of a mixture based on dehydrated boric acid in the form of granules, produced by preparing a mixture containing 70-74 wt% H₃BO₃, 24-28 wt% Al, dehydration with sintering the produced mixture and crushing the sintered composite mixture, package of parts in a sealed container and thermal treatment at a temperature of 950 °C for 3-5 hours. When producing granules from the composite mixture based on dehydrated boric acid, crushing the sintered composite mixture is performed to produce granules with size of up to 1-5 mm. Boron carbide and stannous bronze are being additionally introduced in the saturating mixture, and sodium fluoride or potassium tetrafluoroborate is being used as an activator of the saturating mixture. Saturating mixture has the following composition, wt%: boron carbide 30-38, stannous bronze 30-38, composite mixture in the form of granules based on dehydrated boric acid 30 and sodium fluoride or potassium tetrafluoroborate 2.

EFFECT: providing simplified boriding composition, reduced sintering behavior, increased plasticity of the produced coating, intensified boriding and reduced cost.

1 cl, 2 dwg