Erosion in Large Gun Barrels Report of Committee on Gun Tube Erosion (1975) / Chapter Skim
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INTRODUCTION
INTRODUCTION
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OBJECTIVES The objectives of this report are to make an assessment of the nature of the bore erosion problem; to identify fruitful areas of research; to assess the state of technology of materials and methods in areas which may become significant to gun tubes of improved performance; to suggest experimental techniques, devices, and instruments and methods of reducing data; to enhance the continuing coordination of the activities of the three Services; if feasible, to concentrate on a large weapon such as the 8 inch M110E2 gun system in order to suggest helpful shortrange solutions in addition to possible long-range solutions. DISCUSSION AND RECOMMENDATIONS While the problem of gun erosion has to some measure been alleviated, there is no implicit assurance that future gun systems will have acceptable wear life.
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Assuming a valid test vehicle is available, a parametric investigation of the erosion process should be conducted. The parameters of importance minimally should include propellant chemistry, gun tube metallurgy, projectile materials, and interior ballistic effects.
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Some work on the effects of specific products and the CO/CO ratio have been performed. The need for higher force constant prom pellants, e.g., the nitramine compositions, will drastically alter the composition of the propellant products.
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Insulating and/or Lubricating Sprays or Washes Mold coatings, or "die slicks," as discussed in the casting and forging technology section, would be simple to introduce to the origin of rifling area as a spray between rounds. Their effectiveness in extending die life under conditions approaching those met in gun barrels warrants investigation of both proprietary compounds and experimental compounds expressly developed for gun use.
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Again, Metco is a good source of practical information on these processes. Another protective coating which might merit investigation is a proprietary DuPont product called "Triballoy." A cobaltnickel based alloy, it is reportedly very wear-resistant at elevated temperatures and has good hot-hardness capability.
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5. Cooling The drastic decrease in cutting tool life with increased temperatures prompts investigation into means for reducing gun barrel temperatures.
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