Tools in injection moulding units, especially the check valves, can suffer dry hard metal - hard metal contact under severe conditions, thus experiencing increased wear. For the present study, various hard metal pairings were investigated using dry pin-on-disc tests to simulate the tribosystem of the check valve. Hard metal discs with WxC particle sizes between ∼0.9 and 3 μm and binder contents between 9 and 17.5 wt %, were tested against similar pins with smaller WxC particles. Results show that the cracking of carbides is the major wear mechanisms and that decreased WxC particles sizes together with decreased binder contents lead to lower wear rates. The combination of the hard metal with the smallest WxC particles and the lowest hardness differences between pin and disc leads in this case to a beneficial material transfer and tribolayer formation, resulting in increased wear resistance of both sliding counterparts, promising a lifetime enhancement of the check valves.

注塑单元中的工具，尤其是止回阀，在严酷的条件下会遭受干硬金属 - 硬金属接触，从而增加磨损。在本研究中，使用干销盘试验来模拟止回阀的摩擦系统，研究了各种硬金属配对。WxC 颗粒大小在 0.9 到 3 μm 之间且粘合剂含量在 9 到 17.5 wt% 之间的硬金属圆盘与具有较小 WxC 颗粒的类似销进行了测试。结果表明，碳化物的开裂是主要的磨损机制，WxC 颗粒尺寸的减小以及结合剂含量的降低导致磨损率降低。