Erosion Resistance Evaluation of Potential Gun Barrel Coatings

The erosion resistance of tungsten/carbon and tantalum/tungsten deposited on AISI 4340 steel and molybdenum substrate were investigated. Erosion data acquired with the ARRADCOM test device indicated poor adhesion between each refractory metal coating and 4340 steel. Mechanical failure of the molybde...

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Bibliographic Details
Main Authors: Bracuti, Arthur J, Lannon, Joseph A, Bottei, Louis A, Bhat, D
Format: Report
Language:English
Subjects:
ADHESION
CARBON ALLOYS
Coatings, Colorants and Finishes
EROSION RESISTANCE
FAILURE(MECHANICS)
GUN BARRELS
Guns
MOLYBDENUM ALLOYS
REFRACTORY COATINGS
REFRACTORY METAL ALLOYS
STEEL
Steel AISI 4340
SURFACE ANALYSIS
TANTALUM ALLOYS
TUNGSTEN ALLOYS
VISUAL INSPECTION
WEAR RESISTANCE
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Summary:The erosion resistance of tungsten/carbon and tantalum/tungsten deposited on AISI 4340 steel and molybdenum substrate were investigated. Erosion data acquired with the ARRADCOM test device indicated poor adhesion between each refractory metal coating and 4340 steel. Mechanical failure of the molybdenum substrate complicated the erosion data, but it was concluded that the tungsten/ carbon coating performed better than steel at higher pressures. No apparent advantage was observed with the tantalum/tungsten coating at any pressure. Microscopic examination of the coatings showed extensive gas erosion of the surface of the tantalum/tungsten coating, but very little erosion in the tungsten/carbon surface. Project engineers: Arthur J. Bracuti, Joseph A. Lannon, Louis A. Bottei.