Characterization of ceramics and intermetallics fabricated by self-propagating high-temperature synthesis
Technical Report
·
OSTI ID:5651846
Three efforts aimed at investigating the process of self-propagating high temperature synthesis (SHS) for the fabrication of structural ceramics and intermetallics are summarized. Of special interest was the influence of processing variables such as exothermic dopants, gravity, and green state morphology in materials produced by SHS. In the first effort directed toward the fabrication of SiC, exothermic dopants of yttrium and zirconium were added to SiO2 or SiO2 + NiO plus carbon powder mix and processed by SHS. This approach was unsuccessful since it did not produce the desired product of crystalline SiC. In the second effort, the influence of gravity was investigated by examining Ni-Al microstructures which were produced by SHS combustion waves traveling with and opposite the gravity direction. Although final composition and total porosities of the combusted Ni-Al compounds were found to be gravity independent, larger pores were created in those specimens which were combusted opposite to the gravity force direction. Finally, it was found that green microstructure has a significant effect on the appearance of the combusted piece. Severe pressing laminations were observed to arrest the combustion front for TiC samples.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
- OSTI ID:
- 5651846
- Report Number(s):
- N-89-25285; NASA-TM--102004; E--4710; NAS--1.15:102004
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALLOYS
ALUMINIUM ALLOYS
CARBIDES
CARBON COMPOUNDS
CHEMICAL PREPARATION
CRYSTAL STRUCTURE
DATA
EXPERIMENTAL DATA
FABRICATION
GRAVITATIONAL FIELDS
INFORMATION
INTERMETALLIC COMPOUNDS
MATERIALS WORKING
MICROSTRUCTURE
MORPHOLOGY
NICKEL ALLOYS
NUMERICAL DATA
POROSITY
PRESSING
SILICON CARBIDES
SILICON COMPOUNDS
SYNTHESIS
TITANIUM CARBIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM ADDITIONS
YTTRIUM ALLOYS
ZIRCONIUM ADDITIONS
ZIRCONIUM ALLOYS
360101* -- Metals & Alloys-- Preparation & Fabrication
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALLOYS
ALUMINIUM ALLOYS
CARBIDES
CARBON COMPOUNDS
CHEMICAL PREPARATION
CRYSTAL STRUCTURE
DATA
EXPERIMENTAL DATA
FABRICATION
GRAVITATIONAL FIELDS
INFORMATION
INTERMETALLIC COMPOUNDS
MATERIALS WORKING
MICROSTRUCTURE
MORPHOLOGY
NICKEL ALLOYS
NUMERICAL DATA
POROSITY
PRESSING
SILICON CARBIDES
SILICON COMPOUNDS
SYNTHESIS
TITANIUM CARBIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM ADDITIONS
YTTRIUM ALLOYS
ZIRCONIUM ADDITIONS
ZIRCONIUM ALLOYS