Tungsten copper alloy
Tungsten copper has very good thermal conductivity, electrical conductivity, arc ablation resistance, high temperature performance, plasticity and its processing properties are used as sweating materials, electrical contact materials and so on. Because tungsten copper alloy and semiconductor silicon materials have very similar coefficient of thermal expansion, it has become a widely used heat sink material, packaging material, because of high density, high sound velocity and high plasticity are used as armour breaking ammunition cover material.
The melting point and thermal expansion coefficient of tungsten and copper are very different, the two metal elements are not mutually soluble, and the composite material composed of W and Cu is a typical false alloy. Tungsten copper alloy prepared by powder metallurgy method is easy to produce expansion during sintering, and it is difficult to sintering dense, and the highest density is generally only 92% to 95% of the theoretical density. Compared with the ordinary powder metallurgy method, the relative density of tungsten copper composite prepared by melting method is high (the density reaches more than 98% of the theoretical density), and the mechanical properties are good, which has become one of the main technical methods for the preparation of tungsten copper materials.
The fusion infiltration method is to press W powder into a blank, pre-fired at a certain temperature to prepare a porous W matrix skeleton with a certain density and strength, and then melt the metal Cu with a lower melting point into the W skeleton to obtain a relatively dense W-Cu alloy.
Tungsten copper alloy prepared by traditional fusion method has different sintering activity due to different powder particle size during the preparation of tungsten matrix skeleton, and a large number of closed voids are formed in the skeleton. Coupled with the immiscibility of the two phases, it is easy to cause the composition segregation of tungsten copper two phases during the fusion process, and there is a relatively large copper enrichment area. When tungsten copper alloy is used as heat sink material and die casting mold material, the difference of thermal expansion coefficient between tungsten and copper leads to thermal stress deformation and cracking. The explosive hood is a type of warhead that relies on high speed metal jet to achieve penetration and damage. The metal jet becomes the final carrying unit of explosive energy and the carrier of damage function. The metal jet is formed by the superdynamic instant flip of the material under the action of explosive detonation wave. If the structure of the powder cover material is not uniform, the deformation behavior of the powder cover material is inconsistent under the action of detonation wave, resulting in the collision of different parts of the powder cover material during the turnover process, which greatly consumes the penetration kinetic energy of the explosive, reduces the length of the jet, and thus reduces the penetration power.
In order to eliminate the microstructure inhomogeneity of tungsten copper material prepared by copper tungsten cementation process, a small amount of copper powder is usually added as an inducer in the preparation process of tungsten pre-sintered skeleton blank required by the cementation process through element powder mixing. However, because the way of element mixing is difficult to achieve the microstructure uniformity at the microscopic level. Therefore, how to improve the addition of inducers is the key factor to improve the microstructure uniformity of tungsten copper alloy.
Our company can produce tungsten copper plate, tungsten copper rod, tungsten copper foil, tungsten copper wire and tungsten copper workpiece.
