WOLFRAMFREIE HARTLEGIERUNG UND VERFAHREN FUER IHRE HERSTELLUNG

PCT No. PCT/SU80/00133 Sec. 371 Date Oct. 9, 1981 Sec. 102(e) Date Oct. 9, 1981 PCT Filed Jul. 31, 1980 PCT Pub. No. WO81/02431 PCT Pub. Date Sep. 3, 1981.A tungsten-free hard alloy consists of titanium diboride, titanium carbide and a binder. As the binder the tungsten-free hard alloy contains at least one of metals of subgroup IB of the periodic system inactive relative to boron or an alloy based on one of such metals. The components of the tungsten-free hard alloy are present in the following proportions, percent by mass: titanium diboride-40 to 60 binder-3 to 30 titanium carbide-the balance. The tungsten-free hard alloy of the above-specified composition has a porosity of below 1%. A process for producing a tungsten-free hard alloy comprises preparation of the starting charge by intermixing powders of titanium, boron and carbon, compression of the charge local ignition thereof to initiate the exothermal reaction of titanium with boron and carbon which further proceeds spontaneously under burning conditions being propagated through the charge at the account of the heat transfer from a heated layer of the charge to a cold one. At the stage of the charge preparation, into its composition there is added a powder of at least one of metals of subgroup IB of the periodic system inactive to boron or a powder of an alloy based on one of such metals, or added are powders of metals forming this alloy under the conditions of the above-mentioned exothermal reaction. On completion of the exothermal reaction the resulting solid-liquid reaction mass is compressed to obtain porosity of below 1%.