Studies on the reactive melt infiltration of silicon and silicon-molybdenum alloys in porous carbon

Conference · Tue Sep 01 04:00:00 EDT 1992

OSTI ID:6924763

Singh, M; Behrendt, D R

Investigations on the reactive melt infiltration of silicon and silicon-1.7 and 3.2 at percent molybdenum alloys into porous carbon preforms have been carried out by process modeling, differential thermal analysis (DTA) and melt infiltration experiments. These results indicate that the initial pore volume fraction of the porous carbon preform is a critical parameter in determining the final composition of the reaction-formed silicon carbide and other residual phases. The pore size of the carbon preform is very detrimental to the exotherm temperatures due to liquid silicon-carbon reactions encountered during the reactive melt infiltration process. A possible mechanism for the liquid silicon-porous (glassy) carbon reaction has been proposed. The composition and microstructure of the reaction-formed silicon carbide has been discussed in terms of carbon preform microstructures, infiltration materials, and temperatures.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
• OSTI ID: 6924763
• Report Number(s): N-93-12398; NASA-TM--105860; E--7320; NAS--1.15:105860; CONF-920448--; CNN: RTOP 537-04-10
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
360606* -- Other Materials-- Physical Properties-- (1992-)
ALLOYS
CARBIDES
CARBON
CARBON COMPOUNDS
CHEMICAL COMPOSITION
CRYSTAL STRUCTURE
DIFFERENTIAL THERMAL ANALYSIS
DIFFUSION
ELEMENTS
MATERIALS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NONMETALS
POROUS MATERIALS
SEMIMETALS
SILICON
SILICON ALLOYS
SILICON CARBIDES
SILICON COMPOUNDS
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
THERMAL ANALYSIS