| 摘要 |
PCT No. PCT/EP81/00185 Sec. 371 Date Jul. 23, 1982 Sec. 102(e) Date Jul. 23, 1982 PCT Filed Nov. 20, 1981 PCT Pub. No. WO82/01897 PCT Pub. Date Jun. 10, 1982.A flame spray powder composition is provided for the thermal coating of workpieces comprising a mechanical mixture of hard particles of material and particles of a matrix-forming self-fluxing alloy selected from the group consisting of Ni-base, Fe-base and Co-base self-fluxing alloys. The hard material is a fused tungsten carbide alloy consisting essentially by weight of about 3 to 7% C, an effective amount of iron ranging up to about 3%, up to about 2% total of other alloying elements and the balance essentially tungsten. Substantially each of the fused tungsten carbide alloy particles is characterized by a metal coating having a melting point higher than the melting point of the self-fluxing alloy and having an average particle size less than about 75 microns. The proportion by weight of the coated hard particles in the mixture ranges from about 10% to 95%, with the balance essentially said self-fluxing alloy. The flame sprayed coating produced from the powder mixture on a workpiece is characterized by a strongly bonded coating having high resistance to abrasion and impact and by uniform properties across the cross section of the coating. |
