Self-propagating reactions for synthesis of high-temperature materials. Final report, Nov 87-Mar 89

Technical Report · Mon Apr 01 00:00:00 EST 1991

OSTI ID:6117033

Riley, M A; Zavitsanos, P D; Gebhardt, J J

Hard ceramics including TiB2, produced by conventional methods such as sintering and hot pressing require expensive high temperature process steps and machining which add significant cost to the material. The use of exothermic, self-propagating reactions (SHS), have recently received interest especially by the Soviet to form high purity refractory compounds especially in the boride and carbide systems. The cost effective production of abrasive compounds, cutting tools and high hardness monolithic, refractory materials has been claimed. The SHS process, at its basic level, involves the intimate blending of elemental powders at stoichiometric levels (in this case titanium and boron). Once blended, the materials are pressed into monolithic shapes and heated at one point to a reaction temperature (700 - 1200 C). Upon achieving the reaction temperature, the remaining body is transformed via self-propagating thermal wave into intermetallic or ceramic body based upon the original binary mixture (Ti + 2B yields Ti B2). Lightweight ceramics which can be prepared by SHS reactions are being considered as candidates for armor. Limited testing to date has identified the generic properties which can maximize armor performance.

• Research Organization: General Sciences, Inc., Souderton, PA (United States)
• OSTI ID: 6117033
• Report Number(s): AD-A-241660/0/XAB; CNN: DAAL04-87-C-0083
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
ARMOR
DESIGN
CERAMICS
SYNTHESIS
TITANIUM BORIDES
ABRASIVES
BORON
CARBIDES
CHEMICAL REACTIONS
COST
CUTTING TOOLS
DENSITY
HEAT
HIGH TEMPERATURE
HOT PRESSING
MACHINING
MATERIALS
PERFORMANCE
POWDERS
PRODUCTION
REACTION HEAT
SHAPE
SINTERING
STOICHIOMETRY
WEIGHT
BORIDES
BORON COMPOUNDS
CARBON COMPOUNDS
ELEMENTS
ENERGY
ENTHALPY
FABRICATION
MATERIALS WORKING
PHYSICAL PROPERTIES
PRESSING
SEMIMETALS
THERMODYNAMIC PROPERTIES
TITANIUM COMPOUNDS
TOOLS
TRANSITION ELEMENT COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
450000 - Military Technology
Weaponry
& National Defense