| 摘要 |
The abrasion resistance iron based sintered alloy is manufactured by (a) mixing 77.0 wt% Fe-Cr-Mo-W-V-C based alloy powder, 11.5 wt% Fe-Cr-Mo-Ni based alloy powder, 10.0 wt% Fe-Cr-Mo-W-Co-C based alloy powder, 1.0 wt% graphite powder and 0.5 wt% MnS powder, (b) pressing the mixture under 5-8 ton/cm2, (c) sintering the molded body at 1,120-1,220 deg.C in vacuum to make the framework body for impregnation, (d) impregnation green compact, pressed with 3-6 ton/cm2 and composed of Cu impregnation agent and MoS2 powder, on the framework body at the atmosphere of decomposition ammonia gas or mixture gas of nitrogen and hydrogen, at 1,080-1,150 deg.C for 30-60 min., (e) annealing the impregnation framework body at 1,000-1,200 deg.C for 1-3 hrs. in salt bath furnace or vacuum furnace, (f) tempering it at 540-600 deg.C for 1-2 hrs. in nonoxidative atmosphere.
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