Effects of varying oxygen partial pressre on molten silicon: ceramic substrate interactions, final report
The objective of the contract is to investigate the interaction of molten silicon with various die and container candidate materials under varying oxygen partial pressures. This has been done by making silicon sessile drop contact angle measurements on the candidate materials to determine the degree to which silicon wets these substances, and subsequently sectioning the post-sessile drop experiment samples and taking photomicrographs of the silicon-substrate interface to observe the degree of surface dissolution and degradation. Several different materials supplied by JPL have been investigated in this manner, i.e., hot pressed silicon nitride (from both Kawecki Berylco, Inc. (KBI) and AVCO), CNTD silicon nitride coated on hot pressed silicon nitride (Chemetal-Eagle Picher), CVD silicon carbide coated on graphite (Ultracarbon), and ..cap omega.. Sialon (Battelle). Results are described. The oxygen concentrations in the EFG silicon ribbon furnace at Mobil Tyco Solar Energy Corp., Waltham, Massachusetts, and in the JPL silicon sessile drop furnace at Pasadena, California, were measured using the portable thoria-yttria solid solution electrolyte oxygen sensor constructed at UMR for this purpose. Oxygen partial pressures of 10/sup -7/ and 10/sup -8/ atm. were obtained for the Mobil Tyco and JPL facilities, respectively.
- Research Organization:
- Missouri Univ., Rolla (USA). Dept. of Ceramic Engineering
- DOE Contract Number:
- NAS-7-100-955415
- OSTI ID:
- 5085141
- Report Number(s):
- DOE/JPL/955415-2
- Country of Publication:
- United States
- Language:
- English
Similar Records
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Related Subjects
36 MATERIALS SCIENCE
CERAMICS
COMPATIBILITY
SILICON
CRYSTAL GROWTH
CONTAINERS
CONTROLLED ATMOSPHERES
DIES
ELECTRON MICROSCOPY
MATERIALS
MATERIALS TESTING
OXYGEN
SILICON CARBIDES
SILICON NITRIDES
SUBSTRATES
VAPOR PRESSURE
WETTABILITY
ATMOSPHERES
CARBIDES
CARBON COMPOUNDS
ELEMENTS
MICROSCOPY
NITRIDES
NITROGEN COMPOUNDS
NONMETALS
PHYSICAL PROPERTIES
PNICTIDES
SEMIMETALS
SILICON COMPOUNDS
TESTING
THERMODYNAMIC PROPERTIES
140501* - Solar Energy Conversion- Photovoltaic Conversion
360601 - Other Materials- Preparation & Manufacture