Accession Number : ADA292304

Title :   Improved Inorganic Coatings for Gun Tube Launchers.

Descriptive Note : Final rept. Oct 92-May 94,

Corporate Author : ARMY RESEARCH LAB FORT BELVOIR VA

Personal Author(s) : Emeric, Dario A. ; Farmer, George D., Jr. ; Horner, Howard E.

PDF Url : ADA292304

Report Date : JUN 1994

Pagination or Media Count : 15

Abstract : Electric guns have severe corrosion and erosion problems due to the high temperature and pressures produced by the plasma and gun hyper-velocities. The mechanisms of corrosion and erosion in gun-tube launchers are very complex. The overcoming of erosion and corrosion has become very important since they will determine the service life (conventional guns have a service life of 300 to 1000 rounds depending upon the propellant and projectile used) of the electric guns. The guns will be subject to very high plasma temperatures (10,000 deg C to 50,000 deg C) giving rise to alternating stresses of temperature and pressure. It will also be subject to the chemical reaction of the hot gases produced by the combustion of the propellant and to the abrasive action of the unburned propellant and debris. In addition, it will be subject to ambient temperature corrosion because of the collection of combustion products and condensate in the cracks and crevices produced by the use of the gun. Materials and coatings will be needed that can resist or withstand the above mentioned conditions. jg

Descriptors :   *GUN LAUNCHERS, *COATINGS, *INORGANIC MATERIALS, *ELECTRIC GUNS, STRESSES, CORROSION, LIFE EXPECTANCY(SERVICE LIFE), DEGRADATION, GUN BARRELS, COMPOSITE MATERIALS, FIRING TESTS(ORDNANCE), HIGH TEMPERATURE, PLASMAS(PHYSICS), PROJECTILES, CRACKS, ADHESION, PROPELLANTS, EROSION, CHEMICAL REACTIONS, WEAR, PRESSURE, HOT GASES, HYPERVELOCITY GUNS, REFRACTORY COATINGS, ABRASIVES, COMBUSTION PRODUCTS.

Subject Categories : Guns
      Inorganic Chemistry
      Ceramics, Refractories and Glass
      Coatings, Colorants and Finishes

Distribution Statement : APPROVED FOR PUBLIC RELEASE