Importance

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Abstract

A method making a gun barrel liner includes depositing material on a mandrel that has ribs or ridges corresponding to the rifling grooves in the liner. The material may be deposited using plasma spraying, with sprayed splats of material re-melted after deposition for at least part of the deposition process to reduce or eliminate porosity in the deposited material. The mandrel may be made of metal, such as a high thermal conductivity metal such as copper. The mandrel may have a channel therein or therethrough. The channel may facilitate flow of liquid though the mandrel, one example of such a liquid being a coolant (such as water), used to remove heat produced during the material deposition. Another liquid passed through the channel may be an etchant (or other fluid) that is used to dissolve or otherwise remove the mandrel after the material of the gun barrel liner has been deposited.

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First Claim