Accession Number:

AD0352428

Title:

AN INVESTIGATION OF MATERIALS FOR CHOKE DISCS AND EXPANSION NOZZLES FOR 2-INCH EXPERIMENTAL ROCKET MOTORS

Descriptive Note:

Technical memorandum

Corporate Author:

EXPLOSIVES RESEARCH AND DEVELOPMENT ESTABLISHMENT WALTHAM ABBEY (UNITED KINGDOM)

Personal Author(s):

Report Date:

1964-03-05

Pagination or Media Count:

26.0

Abstract:

Measurements of the amount of choke erosion in a two-inch solid propellant motor containing approximately 34 lb. of aluminised polyurethane propellant have been made, using as choke materials a wide range of commercial grades of graphite and a limited number of processed grades of graphite. The erosion of metal chokes made from tungsten, molybdenum, and tantalum was also measured. Under the conditions of these tests it was found that of the graphites investigated, Nobrac grade M3HF had the highest resistance to erosion. Tungsten was the only metal tested that was superior to the best grades of graphite. The throat erosion of expansion nozzles using the same type of motor was also investigated. In this case the study was restricted to nozzles made from four materials, viz. one commercial grade of graphite, a silicon with a propellant containing 5 aluminum the copper-base alloy, Hidurel 6 proved superior to the other materials tested. All the materials tested eroded substantially when fired with propellants containing 20 aluminium.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Laminates and Composite Materials
  • Metallurgy and Metallography
  • Miscellaneous Materials
  • Solid Propellant Rocket Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE