Tungsten Copper Wear Resistance

Tungsten Copper Wear Resistance

Tungsten copper composite materials are developed for applications such as electrical contacts, resistance electrodes, and contact tips in welding guns as well as for components requiring higher wear resistance. In addition to the aspect of improved performance, it is scientifically interesting to assess the tribological properties, and therefore the objectives of the present work include, to determine the role of W additions in improving the fretting wear resistance of Cu for electrical applications, to determine the optimum concentration for W additions, and to identify the mechanisms responsible for fretting wear improvements. In addressing these issues, a planned set of fretting wear tests were conducted on powder metallurgical processed Cu–W composites (maximum W content of 20 wt %) against steel counter body under varying load (up to 10 N) for 10,000 cycles. It has been observed that at lower loads of 2 N, the coefficient of friction (COF) recorded was ∼0.9 for the Cu–20 wt % W/steel, whereas it was ∼0.85 for a pure Cu/steel couple. Under similar operating conditions with the increase in load, the COF decreases to 0.5 at 10 N load, irrespective of the composition of the Cu–W composite. Furthermore, the incorporation of 5 wt % W has reduced the volumetric wear loss by 4–6 folds in comparison to unreinforced Cu. The addition of even higher percentage of W has led to increase its wear resistance by ∼10 folds. Under the investigated conditions, the wear rate systematically decreases with the increase in load for all the tested Cu–W composites. Based on the topographical observation of worn surfaces, it is observed that wear mechanisms for the Cu and Cu–W composites are tribochemical wear, adhesive wear, and abrasive wear. The incorporation of harder W particles (5 wt % or more) help in abrading the steel ball and in forming a dense tribolayer of FexOy, which effectively reduces wear rate and hence, increases wear resistance of the Cu–W composite surface in reference to unreinforced Cu.

tungsten copper wear resistance picture tungsten copper wear resistance picture

A high temperature tungsten copper wear resistance material for a lining of a blast-furnace tuyere sleeve, which is prepared by the following raw materials in percentage by weight: 40-60% of nano copper powder, 36-56% of nano tungsten powder, 0.2-0.65% of iron powder and 4-6% of chromium powder. Metal conducts plastic deformation and is molten and diffused at high temperature and high pressure and by the aging effect at the high temperature and the high pressure, so that the high-temperature wear-resistant tungsten copper material is obtained. The high temperature wear resistance  material of tungsten copper is good in heat-conducting property, high-temperature strength and high-temperature wear-resistant property, can realize metallurgical bonding with a fine copper substrate, and can be used for manufacturing the lining of the blast-furnace tuyere sleeve, which is good in wear-resistant property and long in service life; the wear-resistant property of the blast-furnace tuyere sleeve can be improved greatly; and the service life of the blast-furnace tuyere sleeve can be prolonged greatly.

The crystals of ammonium paratungstate, and copper sulfate crystals as raw material, and copper sulfate, ammonium metatungstate arranged sol, wherein the solution of W, Cu element ratio of 60: 40, and then spray-drying the sol (atomizing head speed 30000r / min, a temperature of 2500C) to obtain W-Cu precursor powder. The precursor was calcined at 400 ° C 90min to obtain W-Cu composite oxide powder, and then 780 ° C using a hydrogen reduction to obtain a nano W-Cu composite powder. After then, to add iron O. nanoscale W-Cu composite powder 3wt% and chrome powder 5. 0wt%, were milling 3 hours uniformly mixed, placed in a vacuum hot pressing furnace, sintering Eito Arts Figure I shows by high temperature, high pressure and high temperature, aging effects under high pressure, metal plastic deformation, melting and diffusion, to obtain high temperature resistant tungsten copper wear resistance materials.

The tungsten copper wear resistance nano-powder materials were milled, depending on the ratio of copper powder mixed 2_4h, first at the bottom of the prepared graphite mold Xianpu ー about O. 5_ thick layer of pure nano-tungsten-copper resistant materials and then mixed in different proportions holes and pure copper powder powder, copper content increased, the thickness of about I. 5mm, the surface layer of about O. 5mm holes and ー thick pure copper powder. The die set installed hot powder sintering furnace, sintering Eito Arts Figure I shows. The sintering resistant materials combined with copper to form functionally graded materials clean copper surface, the wind ro casting process is placed in Zhu type, embedded directly in the casting process cast in the wind ro sleeve ring surface, so resistant materials combined with wind copper metallurgy between the substrate and the implementation.

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