Accession Number : ADA180783

Title :   Low Pressure Compaction of SHS (Self-Propagating High-Temperature Synthesis) Prepared Ceramics.

Descriptive Note : Memorandum rept.,

Corporate Author : ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Riley,Michael A. ; Niiler,Andrus

Report Date : MAR 1987

Pagination or Media Count : 28

Abstract : Titanium carbide, Titanium diboride and cermets of these compounds have been synthesized by the Self-Propagating High-Temperature Synthesis (SHS) process. It has been shown, definitively, that the mechanism of Ti+C powders reacting to form TiC is the movement of melted titanium to the solid carbon lattice. Extensive porosity in the product is caused by this movement of the titanium but additional voids are formed from the expulsion of contaminant gases during the combustion process. In order to eliminate these voids and porosity in the material, the reacted samples have been compacted up to pressures of 0.41GPA (60Kpsi) immediately after the completion of the combustion. These products have results in samples with densities greater than 95% and microhardness approaching values obtained by conventional sintering techniques. Keywords: Solid Combustion, Ceramics, Ceramics Processing, Cermets, Titanium Carbide, Titanium Diboride Carbon.

Descriptors :   *CERAMIC MATERIALS, *COMPACTING, CERMETS, COMBUSTION, CONTAMINANTS, EXPULSION, GASES, MICROHARDNESS, POROSITY, SOLIDS, CARBIDES, CERAMIC MATERIALS, PROCESSING, LOW PRESSURE, TITANIUM, POWDERS, TITANIUM COMPOUNDS, TITANIUM BORIDE, GAS DISCHARGES, SYNTHESIS, HIGH TEMPERATURE, X RAY ABSORPTION ANALYSIS, POROUS MATERIALS, MICROHARDNESS, NICKEL ALLOYS, SURFACE PROPERTIES, HIGH DENSITY, CRYSTAL STRUCTURE, CARBON

Subject Categories : Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE