Material Of Copper Alloy Wire Sliding Friction And Wear Properties

According to the particularity of friction&wear behaviors of electro-contact lead materials, to provide reliable experimental&theoretical basis for general adoption of market principle of new-type electro-contact lead materials by continuously directional solidification technology, a new-style electro-contact sliding friction&wear testing machine has been successfully developped. Such new-type prototype not only can be used to measure unlubricated sliding frction&wear properties, but also can measure those properties under electro-contact conditions. The device structure is simple and easy to operate, moreover, the data acquired by test is proved to be exact. Single or multiple factors control on voltage, as well as on current, Ioad, velocity, to some extent, are promised to be realized. Consequently, research on tribological properties of different electro-contact materials could be effectively carried through. Currently, satisfactory effects have been obtained by a series of electro-contact friction&wear tests on such machine. Moreover, these experimental results have also been successfully used to improve conductivity and wear-resistance of copper-contact leads.In addition, testing has been done on the electrological properties of monocrystalline copper and Cu-0.lAg alloy by thermal continuous cast production. Unlubricated sliding experiments on monocrytalline copper and Cu-0.lAg alloy with brass as frictional pair have been made under loadcase of different load (0-40N) and speed (l-3m/s), mass wear rate and pattern of worn surface of such material under unlubricated sliding conditions have also been dicussed. According to the above experimental results, the influence of current (0-20A) and voltage (0-30V) on wear properties of electro-contact lead materials has analyzed, meanwhile, wear behaviors and mechanisms of such materials have also been discussed. Same experiment has been done on pure copper, influences of unlubricated sliding and electro-contact sliding friction&wear on different materials have been discussed as well.Experimental results have shown that the relationship between mass wear rate of monocrystalline copper or Cu-O.lAg alloy and load displays linear feature. With load increasing, mass wear rate dramatically increases. The wear-resistance property of Cu-O.lAg alloy is distinctly better than that of monocrystalline copper. Sliding distance and sliding speedalso have greater influence on metal wear. The increasing current dramatically produces greater heat effect of Cu-0.lAgalloy, rapid increase of surface temperature will decrease wear-resistance property of such material. Meanwhile, the relationship between mass wear rate of monocrystalline copper or Cu-O.lAg alloy and voltage also approximately displays linear feature. Their mass wear rate increases with voltage. Experiments also show that Cu-0.lAgallloy is easier to be oxidized and plastically deformed under the function of current. Therefore, monocrystalline copper has better wear-resistance.The development of Monocrystalline copper and copper alloy lead materials, by continuous directional solidification, with cpmprehensive properties such as better electricity conductivity, wear resistance, corrosion-resistance of electricity and higher strength, is an advanced manufacturing technology of great application promise.