AN INVESTIGATION OF MATERIALS FOR CHOKE DISCS AND EXPANSION NOZZLES FOR 2-INCH EXPERIMENTAL ROCKET MOTORS
Abstract
Measurements of the amount of choke erosion in a two-inch solid propellant motor containing approximately 3/4 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 M3/HF 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 05, 1964
- Accession Number
- AD0352428
Entities
People
- G. W. Stocks
- Rachel Soo Hoo Smith