Tungsten Copper Wire Process

The basic process of tungsten copper wires is : Mixing → molding or isostatic pressing → infiltration, sintering tungsten copper rod or tungsten copper block → machining. Except conventional infiltration process, there are some popular processes used more, such as high-temperature liquid phase sintering and activated liquid-phase sintering. The principle of infiltration is that porous tungsten skeleton wetted by copper liquid, under the capillary force the copper liquid flows along the W particle gap, filling the pores of porous tungsten skeleton. So tungsten copper materials have higher density, excellent sintering properties and electrical conductivity; High temperature liquid phase sintering since the sintering temperature is high, a long time, will make a lot of volatile copper phase, so that the sintered tungsten copper material density decrease, the performance will be subject to different degrees of impact, it is difficult to obtain a high density, high conductivity tungsten copper alloy material; activated liquid phase sintering improves the relative density, the hardness and tensile strength of tungsten copper by adding small amounts of trace elements (Ni, Fe, Pd, etc.). But on the contrary, the activated elements will dramatically decrease the electrical and thermal conductivity, which is not suitable for the occasions with high requirements of the conductivity.

The technologies to machine tungsten copper rod or block in wires include drawing processing, rolling processing, roller die drawing techniques and rotary forging technology. Drawing processing take advantage of metal plasticity, when working in the external force so that it is forced through the die, the metal cross-sectional area is compressed to obtain the desired cross-sectional shape and size of the processing method. Preparation of tungsten and copper wire by repeatedly hammering and drawing forming, drawing conducted at room temperature, metal products will produce obvious hardening.

But for tungsten copper with lower Cu content, it has poor plasticity, the drawing rate received extremely limited, which is difficult to draw molding; rolling process is to rely on the friction two rotating rollers and the rolling member rolling pulled into the roll gap, it is compressed to produce plastic deformation process. In addition, the rolling process can also refine the grain, improve the organization, can significantly improve the mechanical properties of the metal alloy, suitable for mass production; Roller die drawing process the billet is drawn in a non-grooved drive, freely rotating rollers consisting of, the sliding friction with the material of the die orifice was changed to rolling friction bearing, the stretching process is more effort not only suitable for drawing round wire, shaped wire may be stretched, but not suitable for low plastic material.

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