Low-Pressure Self-Propagating High-Temperature Synthesis.
Abstract
This document is on self propagating high temperature synthesis (SHS). The object was to produce void free refractory bodies by the synthesis of titanium carbide and titanium boride from the elements without applying isostatic pressure. The experimental study was limited to the synthesis of titanium carbide and titanium bioride with and without a nickel matrix phase. SHS is now state of the art in the Soviet Union for the production of refractory powders for abrasives and for sintering. The Russian literature on SHS reports products of higher purity than can be obtained by conventional means. Potential densification is claimed by the addition of an excess of iron. Methods examined in this study include methods involved preheating the reaction mixture in an induction furnace, the control of the gas pressure in an autoclave and also the addition of varying amounts of a solvent phase and of excess reactants. The results reported in the Russian literature could not be, but found that void free refractory bodies cannot be produced without applying isostatic pressure. The principal value of low pressure SHS is in the synthesis of improved refractory powders. For specialized applications one of several published alternate SHS technologies merit further investigation. These technologies rely on insonification or on centrifuging the reacting material.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1987
- Accession Number
- ADA178593
Entities
People
- A. P. Hardt
Organizations
- Lockheed Martin Missiles and Space