Characterization of MgO-Li/sub 2/O-Al/sub 2/O/sub 3/-SiO/sub 2/ glasses for use as brazing materials

Technical Report · Sun Feb 01 00:00:00 EST 1987

OSTI ID:6805190

Coon, D N; Neilson, Jr, R M; Landini, D J

Glasses in the MgO-Li/sub 2/O-Al/sub 2/O/sub 3/-SiO/sub 2/ system were prepared and characterized for use as brazes to join silicon carbide fiber-reinforced silicon carbide composites. Glasses were examined with differential thermal analysis (DTA), x-ray diffraction analysis, and scanning electron microscopy (SEM) of glass/monolithic SiC interfaces. The glass transition temperature varied with Mg:Li ratios such that additions of Mg increased the transition temperature. Spodumene and related solid solutions were the initial phases evolved upon devitrification. Mg ions were concentrated in the residual glass phase. A composition exhibiting the onset of melting at 1100/sup 0/C or less by DTA melted completely and flowed at 1250/sup 0/C in contact with SiC for 15 minutes. No severe attack of the SiC by the glasses was observed.

• Research Organization: EG and G Idaho, Inc., Idaho Falls (USA)
• DOE Contract Number: AC07-76ID01570
• OSTI ID: 6805190
• Report Number(s): EGG-MS-7523; ON: DE87009724
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
PHASE STUDIES
GLASS
LITHIUM OXIDES
MAGNESIUM OXIDES
REINFORCED MATERIALS
BRAZING
SILICON CARBIDES
SILICON OXIDES
DIFFERENTIAL THERMAL ANALYSIS
FIBERS
SCANNING ELECTRON MICROSCOPY
TRANSITION TEMPERATURE
X-RAY DIFFRACTION
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
DIFFRACTION
ELECTRON MICROSCOPY
FABRICATION
JOINING
LITHIUM COMPOUNDS
MAGNESIUM COMPOUNDS
MATERIALS
MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
SILICON COMPOUNDS
THERMAL ANALYSIS
THERMODYNAMIC PROPERTIES
WELDING
360602* - Other Materials- Structure & Phase Studies