Co-Cr-W/Mo与K4208合金高温磨损性能对比研究

Comparative Study on High Temperature Wear Resistance of Co-Cr-W/Mo and K4208 Alloy

以K417为基材,通过氩弧焊堆焊Co-Cr-W、Co-Cr-Mo和K4208合金制备3种试件,采用GW-MS500型高温微动试验台,测试其在不同温度和载荷下的高温磨损性能,并对静试样表面进行SEM观察及能谱分析,检查动试样表面及内部组织。结果表明:堆焊K4208的高温耐磨性总体最优,堆焊Co-Cr-W在相同载荷及温度条件下的磨损量均最大,这是因为Co-Cr-Mo与K4208合金含有Mo元素,高温下可生成一定量具有与MoS2相似高温润滑性能的MoO2,能够较大程度地降低摩擦因数,提高高温耐磨性能。

Three kinds of K417 specimens were prepared by argon arc welding surfacing Co-Cr-W, Co-Cr-Mo and K4208 coating, and their high temperature wear resistance was investigated in the GW-MS500 high temperature fretting test-bed under different temperature and load. The static sample surface was observed by SEM and analyzed by EDS, the surface and internal organization of the moving sample was anatomized. The results show that the surfacing K4208 coating has the optimal high temperature wear resistance, and the surfacing Co-Cr-W coating has the most wear mass loss in the same load and temperature conditions. Co-Cr-Mo and K4208 alloys contain element Mo, and MoO2 can be formed at high temperature. MoO2 has the similar high temperature lubrication performance as MoS2, which can decrease the friction coefficient greatly, and improve the high temperature wear resistance of Co-Cr-Mo and K4208 alloys.