Accession Number : AD0769287

Title :   Development and Evaluation of PG/SiC Codeposited Coatings for Rocket Nozzle Inserts. Volume III. Subscale Rocket Motor Testing of PG/SiC Lined Throat Inserts.

Descriptive Note : Special rept. Jan 72-Jul 73,

Corporate Author : ATLANTIC RESEARCH CORP ALEXANDRIA VA

Personal Author(s) : Bielawski,Cedric ; Singleton,Richard H.

Report Date : OCT 1973

Pagination or Media Count : 45

Abstract : Six ATJ graphite 1.0-inch throat diameter nozzle throat inserts and four entrance approach sections were coated with PG/SiC and test fired with a low oxidizing 21 percent aluminum 5600F propellant. A preliminary throat erosion rate for PG/SiC of four mils per second at 2000 psia and seven mils per second at 2500 psia average chamber premere was established. Use of a graded coating in which the last third of the deposit was pure pyrographite approximately halved the erosion rate. The inserts appeared to be less prone to cracking when the ATJ substrates had been heat treated at 5400F prior to coating. (Author)

Descriptors :   (*Refractory coatings, *Nozzle inserts), Rocket nozzles, Pyrolytic graphite, Silicon carbides, Vapor deposition, Model tests

Subject Categories : Coatings, Colorants and Finishes
      Solid Propellant Rocket Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE