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Deformation and fracture of single-crystal and sintered polycrystalline silicon carbide produced by cavitationAn investigation was conducted to examine the deformation and fracture behavior of single-crystal and sintered polycrystalline SiC surfaces exposed to cavitation. Cavitation erosion experiments were conducted in distilled water at 25 C by using a magnetostrictive oscillator in close proximity (1 mm) to the surface of SiC. The horn frequency was 20 kHz, and the double amplitude of the vibrating disk was 50 microns. The results of the investigation indicate that the SiC (0001) surface could be deformed in a plastic manner during cavitation. Dislocation etch pits were formed when the surface was chemically etched. The number of defects, including dislocations in SiC (0001) surface, increased with increasing exposure time to cavitation. The presence of intrinsic defects such as voids in the surficial layers of the sintered polycrystalline SiC determined the zones at which fractured grains and fracture pits (pores) were generated. Single-crystal SiC had superior erosion resistance to that of sintered polycrystalline SiC.
Document ID
19890067614
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Miyoshi, Kazuhisa
(NASA Lewis Research Center Cleveland, OH, United States)
Hattori, Shuji
(NASA Lewis Research Center Cleveland, OH, United States)
Okada, Tsunenori
(Fukui University Japan)
Buckley, Donald H.
(Case Western Reserve University Cleveland, OH, United States)
Date Acquired
August 14, 2013
Publication Date
July 1, 1989
Publication Information
Publication: STLE Tribology Transactions
Volume: 32
ISSN: 0569-8197
Subject Category
Nonmetallic Materials
Accession Number
89A54985
Distribution Limits
Public
Copyright
Other

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