| 摘要 |
<p>This new abrasion-resistant sintered alloy comprises a Cr-C-Fe base alloy (1) and particles dispersed in (1). The base alloy (1) is made of a Cr-C-Fe alloy powder containing 10-20 wt.% Cr, 1.5-3.5 wt.% C and Fe (the remainder). The dispersed particles are made up of CaF2 powder (0.5-3 wt.%) and a hard alloy powder (5-20 wt.%) having particle of size 44-150 micron and of average Vickers hardness 800-2000. The size of the CaF2 particles is 149 microns or less. The hard alloy powder comprises Cr (50-70 wt.%), C (5-10 wt.%), Si (1 wt.% or less), and Fe (the remainder). The base alloy can contain Co and/or Ni (total wt.% : 1-5 wt.%) with or without at least one element selected from Mo, Nb, W, V (total wt.% : 1-5 wt.%). The abrasion-resistant sintered alloy can be produced in the following steps: (1) C powder (1.2-2.0 wt.%) and CaF2 powder (0.5-3.0 wt.%) are added to the Fe-Cr-C alloy powder; (2) the mixture is moulded into shape; (3) the moulding is sintered at a temp. of 1180-1260 deg.C in a non-oxidizing atmosphere.</p> |
