Patent ID: 6511710
Filing Date: 2003-01-28
Classification: F41A

Abstract:
A method of a coating an inner surface of a weapon barrel to protect said weapon barrel inner surface against corrosion comprising the following steps:(a) introducing a plasma burner into the weapon barrel; (b) producing a plasma flame by the plasma burner; (c) directing the plasma flame against the inner barrel surface to cause impingement thereon and to heat material of said weapon barrel inner surface to a temperature at which said material of said weapon barrel inner surface melts; (d) introducing a coating material into the plasma flame for melting the coating material to form a molten liquid and for depositing the molten liquid by the plasma flame directly on the inner surface, wherein said coating material is in the form of powder, wire or ribbon and wherein said coating material is selected from the group consisting of niobium, molybdenum, tantalum, hafnium, vanadium, tungsten, zirconium and alloys thereof; and (e) moving the plasma burner inside the weapon barrel axially thereof and relative thereto and alloying at least a portion of said coating material at said surface while performing steps (b), (c) and (d) for obtaining a surface coating on the inner barrel surface.