METHOD FOR PRODUCING TUNGSTEN CARBIDE POWDER, DEVICE FOR REALIZATION OF METHOD AND TUNGSTEN CARBIDE POWDER, PRODUCED USING SAID METHOD

摘要

FIELD: production of wear-resistant materials used in composite surfacing covers.;SUBSTANCE: in accordance to method, original stock is fed into rotating cooled crucible, where it is melted down by means of plasma arc discharge. Crucible acts as anode, nitrogen is used as plasma-generating gas. Produced plasma ensures saturation of melt with nitrogen up to the above-balanced state. During spraying, drops of spherical shape are created, which during cooling are crystallized in form of granules of given granule-metric composition. Device contains cylinder-shaped chamber with a lid. Inside the chamber, spraying device is positioned, made in form of rotating current-conductive cooled crucible. Plasmatron is fastened to chamber lid above the crucible and mounted at angle β to crucible rotation axis with possible changing of aforementioned angle. Powder produced by suggested method consists of sphere-shaped granules of eutectic tungsten carbide of WC-W₂C phase composition with 3,8-4,2% of mass of bound carbon content and 0,005-0,3% of mass of dissolved nitrogen. Resulting granules have granule-metric composition from 20 micrometers to 1200 micrometers, small-grained perlite structure and have increased micro-hardness and resistance to crushing force.;EFFECT: production of powder with increased resistance to wear from abrasion and impacts, increased efficiency and productivity of device due to decreased heat losses and increased working resource.;3 cl, 1 dwg, 1 tbl, 1 ex