Shaped Charge Liners Made with Powdered Metals with High Malleability and High Sound Speed
Publication Date: 2015-May-13
The IP.com Prior Art Database
One method to increase the liner theoretical density is to use the tungsten (W) powder in the liner powder blend. The higher the W content, the higher the theoretical density of the liner material. However, as the W content increases, the press-ability of the powder blends is reduced due to high volume amount of the hard W. In some cases, the powder blend with high W content cannot be pressed into a liner at all due to the damage the W particles cause to the pressing tooling. To solve this issue, copper (Cu) coated W powder is used instead of using the elemental W and Cu powder. Conversely, more ductile tantalum (Ta) powder can be used to replace W or some portion of W to maintain the density while improving the press-ability.
To further improve the performance of the shaped charge, powdered metals with high malleability and high sound speed are used as the liner materials. With high percentage of malleable metals, the liner powder can be pressed into higher relative density (or lower porosity) with given pressing force. For example, a Cu-molybdenum (Mo)-carbon (C) powder mixture can be used as the liner powder. In this case, Cu and Mo are malleable and both have high sound speed. W powder can be added to make Cu-Mo-W-C blend so the theoretical density of the liner material is increased. Cu, Mo and W can be mixed together with elemental powders. The Cu can also be coated to Mo and W powders as Cu-Mo and Cu-W coated powders and then mixed together with C. Some of these elements can be alloyed together and then mixed with other elements to make the final composition.
Nickel (Ni) can be used to replace Cu in the liner material. Ni has higher sound speed than Cu so a Ni-W-lead (Pb)-C liner material is expected to have higher sound speed than the Cu-W-Pb-C liner material. Elemental Ni powder can be mixed with elemental W, Pb and C powders. Ni can also be coated to W powder as Ni-W which is then mixed with elemental Pb and C powders. Ni can also be used to replace Pb to make Ni-Cu-W-C liner material. In this case, the higher sound speed Ni is used to replace the lower sound Pb which is typically used as one of the elements for the liner material. Elemental Ni,...