Preparation Process of Fine-grained WCu-Cu Alloy Cover

With the development of military modernization, the anti-ballistic capabilities of some armored tanks, armored vehicles, etc. have greatly improved. The now-existing fish-scale reaction armor with high ballistic resistance, lean-shaft load armor, ceramic composite armor, and explosive reaction armor pose even more severe challenges to opposing anti-armor weapons. The combination of shaped charge and precision guided technology is currently the most effective anti-armor weapon. The key component of shaped charge is the drug type cover. The performance of the shaped charge directly affects the penetration of the Sunder Jet. And stability. Therefore, the research on new drug-mask materials has become one of the research hotspots of related scholars and researchers. The research direction is mainly focused on how to enhance the ductility of the material, increase the material density and refine the grain structure. The enhancement of ductility contributes to the formation of long projectiles, thereby increasing the penetration depth; the increase in density increases the impact force; refinement of the grain structure facilitates the increase of the length of the jet.

Due to the single component, the traditional material's drug mask is not enough to meet the changing performance requirements of today. With the deepening of research, there have emerged a variety of materials composed of composite drug masks. It meets the design requirements of the drug mask by combining metals or alloys with various properties. Compared to the single metal drug mask, it has high energy conversion efficiency, high energy utilization rate, more reasonable absorption mechanism, and armor fracture performance. More superior is the inevitable trend in the development of drug masks. Among these composite materials, the properties of W-Cu alloy are most closely matched to the drug mask. Tungsten-copper alloys are pseudo-alloys with a body-centered cubic structure, W, and a face-centered cubic structure, which have relatively different physicochemical properties, and are not mutually soluble and do not form intermetallic compounds. It not only has high hardness, high strength, high density, low thermal expansion coefficient and excellent wear resistance of W, but also has plasticity of Cu and excellent electrical and thermal conductivity. Tungsten jets have a higher head speed and can effectively reduce the penetration time when penetrating the armor, thus facilitating reaction armor. However, its texture is relatively brittle and its powder adhesion is poor, and the ductile copper powder contributes to its formation, and the stability of the jet is improved and it is not easy to break.

However, the tungsten-copper alloy materials prepared by the conventional powder metallurgy method have a lot of random factors that need to be controlled in the process of mechanized packing, press forming, etc. due to the large metal powder fluidity, and the formed crystal grains are coarse and uniform. Poor nature, difficulty in controlling density distribution, and large fluctuations in depth of penetration. Density cannot meet the needs of related weapons and equipment. In addition, the tungsten-copper compound drug mask is very sensitive to the high explosive charge, and the depth of the armor is rapidly reduced under the high blast and the best blast height is 3 times the bore size. This is also the commonality of the composite drug masks. That is, the depth of the armor can be increased by about 30% compared with the pure copper drug mask under high blasting conditions, but the performance deteriorates rapidly at high blast height and ductile jets cannot be obtained. To this end, related researchers have proposed a new process for the preparation of fine-grain tungsten-copper alloy mold caps using spray pyrolysis milling-ball-milling wet-mixing-liquid phase sintering. The nano-sized tungsten phase precipitated by spray pyrolysis is similar to a sphere, and is evenly distributed on the Cu group, which improves the activity of both; the ball milling and wet mixing can reduce the oxidation of the powder and prevent the aggregation of the metal particles; liquid phase sintering It will make the material more dense and more uniform.