Delayed fracture of silicon. Silicon sheet growth development for the Large Area Silicon Sheet Task of the Low Cost Silicon Solar Array Project. Final report
Bar specimens were cut from ingots of single crystal silicon, and acid-etched prior to testing. Artificial surface flaws were introduced in specimens by indentation with a Knoop hardness tester. The specimens were loaded in four-point bending to 95% of the nominal fracture stress, while keeping the surface area, containing the flaw, wet with test liquids. No evidence of delayed fracture, and, therefore stress corrosion, of single crystal silicon was observed for liquid environments including water, acetone and aqueous solutions of NaCl, NH/sub 4/OH, and HNO/sub 3/, when tested with a flaw parallel to a (110) surface. The fracture toughness was calculated to be K/sub IC/ = 0.591 x 10/sup 6/ N/m/sup 3/2/.
- Research Organization:
- California Univ., Los Angeles (USA). Dept. of Materials
- DOE Contract Number:
- NAS-7-100-954836
- OSTI ID:
- 6868645
- Report Number(s):
- DOE/JPL/954836-1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
140501* -- Solar Energy Conversion-- Photovoltaic Conversion
36 MATERIALS SCIENCE
360603 -- Materials-- Properties
ACETONE
ALKALI METAL COMPOUNDS
AMMONIUM COMPOUNDS
AMMONIUM HYDROXIDES
AQUEOUS SOLUTIONS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CORROSION
CRYSTALS
CUTTING
DISPERSIONS
ELEMENTS
ETCHING
FRACTURE PROPERTIES
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
INORGANIC ACIDS
KETONES
MACHINING
MATERIALS TESTING
MECHANICAL PROPERTIES
MIXTURES
MONOCRYSTALS
NITRIC ACID
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
SEMIMETALS
SILICON
SODIUM CHLORIDES
SODIUM COMPOUNDS
SOLUTIONS
STRESS CORROSION
SURFACE FINISHING
TESTING
WATER