| 摘要 |
<p>A nickel based powder or wire material, for thermal deposition of highly corrosion and wear resistant coatings, has the composition (by wt.) 0.005-1.0% C, 10-26% Cr, 8-20% Mo, 0.1-10% Fe, 3-7% Si, 1-4% B, 0.1-5.0% Cu and balance Ni. Preferably, the material has the composition 0.01-0.5 (especially 0.05-0.3)% C, 14-20 (especially 15-18)% Cr, 10-18 (especially 12-16)% Mo, 0.5-5.0 (especially 2-4)% Fe, 4.0-6.5 (especially 4.5-5.5)% Si, 1.5-3.5 (especially 2-3)% B, 1-4 (especially 2-3)% Cu and balance Ni. The powder may be mixed with a Ni-B-Si powder and/or a Ni-Cr-B-Si powder. Also claimed are (a) methods of thermally depositing the above material to produce a corrosion and wear resistant coating on a workpiece, in which (i) the coating material powder is an alloyed and atomised material or an agglomerate of various alloyed and unalloyed metal powders; and (ii) the coating material is used in the form of a filled wire or an alloyed and cast rod and (b) a method of depositing the above material, especially using method (i) or (ii), by thermal spraying, especially plasma powder weld deposition, flame spraying with subsequent remelting, high velocity flame spraying, two-wire arc spraying or arc weld deposition.</p> |
