Tungsten Copper Liner Warm Flow Compaction (2/2)

The liner is the key component of perforation bombs and armor-piercing, whose performance directly affects the penetration depth and piercing armor-piercing shells and after the explosion. In the early days, it uses turning process to fabricate copper rods and iron rods to form the liner shape or press-molding process to copper plate and iron plate. But these process has lower productivity, low dimensional accuracy and less prone to clogging of the perforation. With the development of powder metallurgy, powder sintering gradually replaced the cover plate liner, the production process is simplified, and overall efficiency has been improved.

However, due to the cover wall is thinner, easily deformed during sintering, poor surface fineness, it needs some optimization. Warm flow compaction can form the large component with a complex shape or structure and uniform density distribution, which is beneficial for the further expansion of tungsten copper material applications. It combines the advantages of injection molding and warm compacting process, which improves the flowability of the mixed powder by the viscosity changing of the binder. There are some experiments shows that the density distribution of W-70Cu liner by warm flow compaction is more uniform and the penetration is more stable.

Overall, compared with the injection molding suitable for the smaller components, warm flow compaction is more suitable for the larger components with complex structure and shape. It has higher requirements on the granularity of raw material and is sensitive to the temperature changes and the amounts of binder. Low temperature may cause mixing powder flow properties deteriorated, so that the tungsten copper shaped charge density distribution can not be molded or uneven. High temperature may obviously separate the two phase (the mixed powder and the binder). The excessive amount of adhesive may cause infiltrated tungsten skeleton pore through the large, so that the density decreases and easily deformed. In addition, warm flow compaction combines the advantages of injection molding and warm compacting process, and it can effectively improve the density, the penetration depth and armor capability of tungsten copper liner, which is the ideal choice for tungsten copper liner manufacturing in the future.

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