Accession Number : ADD008386

Title :   Hypervelocity Projectile with Aluminum Components of High Resistance to thermodynamic Ablation.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Miller,Gary M ; Koch,Curtis J

Report Date : 04 Jul 1978

Pagination or Media Count : 4

Abstract : In accordance with this invention, aluminum components of projectiles, e.g., fins and windshields, are provided with a hard anodic coating of increased resistance to aerodynamic thermal ablation on the aluminum component in known manner by anodic exidation of the aluminum in a refrigerated acid electrolyte maintained essentially below 10 C, and then sealing the hard anodic coating thus obtained by contact with a hot aqueous solution of an alkali metal silicate of the formula Me2O:x.SiO2, wherein Me is an alkali metal, such as sodium and potassium, and x is at least about 2.0. The coating obtained according to the present invention provides a superior thermal barrier between the airstream and the base aluminum to prevent heat and friction from softening and ablating the aluminum.

Descriptors :   *Patents, *Hypervelocity projectiles, *Protective coatings, *Anodic coatings, *Ceramic coatings, Aluminum, Alkali metal compounds, Silicates, Fin stabilized ammunition, Windshields, Ablation, Resistance, Inventions

Subject Categories : Coatings, Colorants and Finishes
      Ammunition and Explosives

Distribution Statement : APPROVED FOR PUBLIC RELEASE