中文摘要：

利用等离子渗金属技术，首先在Q235低碳钢表面分别进行钨一钼-钇共渗和钨一钼共渗，然后进行960，980，1020℃渗碳及淬火及200℃低温回火处理，最后在GZTC-01型磨损试验机上进行耐磨性能考核。研究结果表明：（1）试样均有明显的前期磨合期与后期稳定期，进入稳定期后，随着淬火温度提高，钨．钼．钇共渗强化处理试样（下称钨钼钇试样）磨损量连续降低且为最小；而钨一钼共渗强化处理试样（下称钨钼试样）磨损量先升后降，于1020℃时达到最低；T10钢淬火及回火试样（下称T10钢）的磨损量最大，钨钼钇试样和钨钼试样较之约小1～2个数量级；相比T10钢，钨钼钇试样和钨钼试样在960℃强化时耐磨性分别约提高11．8倍和2．85倍，在980℃时约提高12．6倍和2．2倍，在1020℃时约提高22．1倍和3．9倍；（2）整个磨损时间内，960，980，1020气强化处理的钨钼钇试样的相对耐磨性分别是钨钼试样的3．75倍、3．05倍、3．55倍。钨钼钇试样的相对耐磨性较T10钢最高可达12．28倍。稀土与合金元素的加入均提高了耐磨性，前者更显著；（3）钨钼钇试样和钨钼试样磨损后的表面形貌均为典型的磨粒磨损，划痕清晰，犁沟明显。前者划痕较细，犁沟浅而窄。钇的渗人促进了碳化物形成和沉淀析出，改善了渗层耐磨性能。

英文摘要：

W-Mo-Y co-cementation layer and W-Mo co-cementation layer were prepared on the surface of Q235 steel by plasma sur- face alloying technology, then the steel was carburized and quenched at 960,980, 1020 ~C, and tempered at 200 ~C. The wear resist- ance evaluation was detected by a GZTC-O1 wear experiment device. The results showed that： （ 1 ） the samples all existed obvious pro- phase run-in period and post-stabilization period; and after stepping into the stabilization period, with the increase of quenching tem- perature, wear loss of W-Mo-Y sample the lowest and reduced continuously with the increase of quenching temperature, but wear loss of W-Mo sample firstly rose but then reduced （ the lowest value was at 1020 ℃ ） ; wear loss of T10 sample was maximal, which was 1 to 2 orders of magnitude lower than that of W-Mo-Y sample and W-Mo sample; the wear resistance of W-Mo-Y sample and W-Mo sam- ple was respectively 11.8 and 2.85 times than that of T10 sample at 960 ℃, respectively 12.6 and 2.2 times than that of T10 sample at 980 ℃, and respectively 22.1 and 3.9 times than that of TIO sample at 1020 ℃ ; （2） the relative wear resistance of W-Mo-Y sam- ple at 960, 980 and 1020 ℃ was 3.75, 3.05 and 3.55 times than that of W-Mo sample during the entire wear time. The maximal relative wear resistance of W-Mo-Y sample was 12.28 times than that of T10 sample. The morphologies of W-Mo-Y sample and WMo sample were typical abrasive wear; the scratches were clear, and the both rare earth and alloy elements could improve the wear resistance, and the former was better. （3） The surface wear furrows were obvious. The former existed smaller scratches, deeper and narrower furrows. So Y element could promote the formation and precipitation of carbides and improve the wear resistance of alloying layer.