Accession Number : ADA954948

Title :   Ceramic Nozzles: A Metallographic Examination of Eroded, Hog-Pressed, Ceramic Nozzles for Recoilless Weapon.

Descriptive Note : Memorandum rept.,

Corporate Author : WATERTOWN ARSENAL LABS MA

Personal Author(s) : Reed,E. L. ; Carter,H. G. ; Foster,L. S.

Report Date : 30 JUL 1951

Pagination or Media Count : 76

Abstract : To develop metallographic techniques (a) to reveal the microstructure of eroded hot-pressed ceramic nozzles; (b) to determine whether the bore surfaces have undergone any chemical or structural changes; and (c) to ascertain whether erosion takes place only by mechanical abrasion, or by mechanical abrasion accompanied by other physical and chemical processes. Metallographic methods wee selected and utilized to reveal the microstructure of these eroded hot-pressed ceramic nozzles. Each material required individual study and the use of a specific etchant to reveal the structural details. In most cases, erosion of the hot-pressed ceramic nozzles appeared to be a more complicated process than mere mechanical abrasion. Evidences of chemical reaction, increasee porosity, melting, thermal shock, an other alterations are revealed when the bore surface is observed metallographical in a polished and etched cross-section.

Descriptors :   ABRASION, BORES, CERAMIC MATERIALS, CHEMICAL REACTIONS, CROSS SECTIONS, EROSION, ETCHING, HOT PRESSING, MECHANICAL PROPERTIES, METALLOGRAPHY, MICROSTRUCTURE, NOZZLES, POROSITY, RECOIL MECHANISMS, SURFACES, THERMAL SHOCK, WEAPONS

Subject Categories : Ceramics, Refractories and Glass
      Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE