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Record Details

Record 37 of 5655
High-strength silicon carbides by hot isostatic pressing
Author and Affiliation:
Dutta, Sunil(NASA Lewis Research Center, Cleveland, OH, United States)
Abstract: Silicon carbide has strong potential for heat engine hardware and other high-temperature applications because of its low density, good strength, high oxidation resistance, and good high-temperature creep resistance. Hot isostatic pressing (HIP) was used for producing alpha and beta silicon carbide (SiC) bodies with near-theoretical density, ultrafine grain size, and high strength at processing temperatures of 1900 to 2000 C. The HIPed materials exhibited ultrafine grain size. Furthermore, no phase transformation from beta to alpha was observed in HIPed beta-SiC. Both materials exhibited very high average flexural strength. It was also shown that alpha-SiC bodies without any sintering aids, when HIPed to high final density, can exhibit very high strength. Fracture toughness K (sub C) values were determined to be 3.6 to 4.0 MPa m (sup 1/2) for HIPed alpha-SiC and 3.7 to 4.1 MPa m (sup 1/2) for HIPed beta-SiC. In the HIPed specimens strength-controlling flaws were typically surface related. In spite of improvements in material properties such as strength and fracture toughness by elimination of the larger strength-limiting flaws and by grain size refinement, HIPing has no effect on the Weibull modulus.
Publication Date: Jan 01, 1989
Document ID:
19900048418
(Acquired Nov 28, 1995)
Accession Number: 90A35473
Subject Category: NONMETALLIC MATERIALS
Document Type: Conference Paper
Publication Information: (SEE A90-35451)
Publisher Information: United States
Meeting Information: International Symposium on Ceramic Materials and Components for Engines; 3rd; Nov. 27-30, 1988; Las Vegas, NV; United States
Financial Sponsor: NASA; United States
Organization Source: NASA Lewis Research Center; Cleveland, OH, United States
Description: 13p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: FRACTURE STRENGTH; HOT ISOSTATIC PRESSING; MICROSTRUCTURE; PHASE TRANSFORMATIONS; SILICON CARBIDES; CRYSTAL DEFECTS; FLEXURAL STRENGTH; GRAIN SIZE; HIGH TEMPERATURE
Imprint And Other Notes: IN: Ceramic materials and components for engines; Proceedings of the Third International Symposium, Las Vegas, NV, Nov. 27-30, 1988 (A90-35451 15-27). Westerville, OH, American Ceramic Society, Inc., 1989, p. 683-695. Previously announced in STAR as N89-13666.
Availability Source: Other Sources
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