Simultaneous combustion synthesis and densification of refractory materials
Conference
·
OSTI ID:6146787
When the temperature of a self-propagating combustion reaction is below the melting temperature of the product, which is usually the case, the product is a powder or has a highly porous structure. Contributing to the large volume of porosity is the difference of molar volume of the products and reactants, porosity in the reactant compact prior to combustion, and the evolution of impurity gases during combustion. Since there is no data on the effect of volatile gases on the amount of porosity and the morphology of the pores in combustion products we will present the preliminary results of our research on the influence of different outgassing temperatures on the structure of 0.5 TiB - 0.5 tiB/sub 2/, a product of the reaction Ti + 1.5 B. By combining the synthesis process with high pressure techniques, it is possible to densify the refractory products in one simple operation. Our experiments using a gas gun to apply large pressure waves immediately after combustion will be described for different chemical reactions. Both single phase (TiC) and composite materials (0.5 TiB - 0.5 TiB/sub 2/, TiB/sub 2/ - Fe and TiC - 2 Al/sub 2/O/sub 3/) have been simultaneously synthesized and densified to over 95% of theoretical density. 7 refs., 8 figs., 2 tabs.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6146787
- Report Number(s):
- UCRL-93467; CONF-8510280-1; ON: DE86006528
- Country of Publication:
- United States
- Language:
- English
Similar Records
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Journal Article
·
Sun Feb 28 23:00:00 EST 1993
· Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)
·
OSTI ID:6350611
Combustion synthesis of TiC-based materials: Mechanisms, densification, and properties
Conference
·
Tue Aug 01 00:00:00 EDT 1995
·
OSTI ID:77976
Combustion synthesis and densification of TiC-TiB{sub 2} and TiC-WC powders
Book
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Tue Aug 01 00:00:00 EDT 1995
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OSTI ID:77957
Related Subjects
36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
BORIDES
BORON COMPOUNDS
CHEMICAL REACTIONS
COLD PRESSING
COMBUSTION
CRYSTAL STRUCTURE
DEGASSING
DENSITY
FABRICATION
MATERIALS WORKING
MICROSTRUCTURE
OXIDATION
PHYSICAL PROPERTIES
POROSITY
PRESSING
REFRACTORIES
SINTERING
THERMOCHEMICAL PROCESSES
TITANIUM BORIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
BORIDES
BORON COMPOUNDS
CHEMICAL REACTIONS
COLD PRESSING
COMBUSTION
CRYSTAL STRUCTURE
DEGASSING
DENSITY
FABRICATION
MATERIALS WORKING
MICROSTRUCTURE
OXIDATION
PHYSICAL PROPERTIES
POROSITY
PRESSING
REFRACTORIES
SINTERING
THERMOCHEMICAL PROCESSES
TITANIUM BORIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS