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):

Report Date:

1978-07-04

Pagination or Media Count:

4.0

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 Me2Ox.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.

Subject Categories:

  • Coatings, Colorants and Finishes
  • Ammunition and Explosives

Distribution Statement:

APPROVED FOR PUBLIC RELEASE