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Research Papers

Cold Sprayed Liners for Gun Tubes

[+] Author and Article Information
Matthew D. Trexler, Robert Carter, Victor K. Champagne

 US Army Research Laboratory, Weapons and Materials Research Directorate, Aberdeen Proving Ground, MD 21005-5069

J. Pressure Vessel Technol 134(4), 041010 (Jul 09, 2012) (4 pages) doi:10.1115/1.4006128 History: Received November 08, 2011; Revised February 13, 2012; Published July 09, 2012

The use of refractory materials is currently being developed for gun barrel coatings and liners. Explosive cladding, as well as a novel gun liner emplacement with elastomeric material (GLEEM) technique has been shown to be a successful method for bonding liners into 25-mm M242 Bushmaster barrels. The process relies on commercially available tube products that serve as the liner materials that are often difficult to manufacture. Cold spray is a novel process used to consolidate metal powders into both thin coatings and large bulk materials that is being investigated as a cost effective alternative to conventional processing techniques. This work examines the use of cold spray as it pertains to the consolidation of Ta donor tubes for explosively bonded gun liners. Ta tubes were consolidated and annealed to increase the ductility of the material from 0.2% to 35% strain as determined by tensile testing. Ta donor tube was successfully explosively clad to 25 mm gun barrel forging. Bond strength testing results of explosively clad cold spray tube were found to be comparable to commercially obtained liners. GLEEM was also successfully employed. However, the mechanical bond strength of this cladding was considerably lower than that of the explosively clad liner. The failure mechanism during GLEEM is slip between the liner and the forging and is due to the fact that the process relies on frictional bonding rather than metallurgical bonding.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

The GLEEM process

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Figure 2

Cold spray process

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Figure 3

SEM micrographs of optimized Ta powder (left) and the corresponding Ta coating on an Al substrate (right)

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Figure 4

Consolidated Ta tube 12 in. in length, 1 in. diameter, with a wall thickness of 1/8 in.

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Figure 5

Tube sections after burst testing (left) showing the annealed case that exhibits recovered ductility and the “as sprayed” case, which shows brittle fracture. Digital image correlation analysis (right) was used to measure strains up to 12% before the test was terminated.

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Figure 6

Tensile data comparing the “as sprayed” and annealed cold sprayed Ta materials

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Figure 7

Images of tensile fracture surfaces of as sprayed and annealed tantalum: (a) as sprayed condition and (b) annealed condition

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Figure 8

Cross section of push-out test fixture (not to scale) with sample ring in place

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Figure 9

Load versus time for explosively clad and GLEEM push-out samples

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