层状WC/TiC陶瓷刀具材料与轴承钢的摩擦磨损性能

Tribological Properties of Laminated WC/TiC Ceramic Cutting Tool Materials Sliding Against Bearing Steel

采用雾化-喷覆液膜-干燥工艺及真空热压烧结技术制备了层状WC/TiC陶瓷刀具材料,在干摩擦条件,将其与GCr15轴承钢进行了摩擦磨损实验,研究了不同滑动速度和不同载荷对其摩擦系数和磨损量的影响规律,并对其摩擦磨损后的表面形貌进行了分析。结果表明:在相同载荷条件下,材料的摩擦系数和磨损量均随滑动速度的升高而减小,当滑动速度为12m/min时,材料的摩擦系数和磨损量最小,其值分别为0.276和0.68×10^(-3)mm^3;在相同滑动速度条件下,材料的摩擦系数和磨损量也均随载荷的增大而减小,载荷为120N时,材料的摩擦系数和磨损量最小,其值分别为0.157和0.58×10^(-3)mm^3;材料的磨损机理主要是粘着磨损和磨粒磨损。

Laminated WC/TiC ceramic cutting tool materialswere fabricated by the atomized-sprayed coated liquid film-dried method and the vacuum hot-pressing sintering technology. Friction and wear behaviors of the materials sliding against GCr15 bearing steel under dry sliding condition were investigated,which included effects of loads and sliding speeds on friction coefficient and wear volume loss and morphologies of worn surfaces of the laminated WC/TiC ceramic cutting tool materials.Results show that the friction coefficient and wear volume loss decreased with an increase of the sliding speed at the same load of 100 N,and the smallest friction coefficient and wear volumeloss could be obtained as they are 0.276 and 0.68 ×10^(-3)mm^3 respectively at the sliding speed of 12 m/min. The friction coefficient and wear volume loss also decreased with an increase of the load at the same sliding speed of 12 m/min,and the smallest friction coefficient and wear volumeloss could be obtained as they are 0.157 and 0.58 ×10^(-3)mm^3 respectively at the load of 120 N.The main wear mechanisms of laminated WC/TiC ceramic cutting tool materials are adhesive wear and abrasive wear.