Alumina-Silicon Carbide Composites from Coated Powders [Thesis]

Thesis/Dissertation · Fri Nov 30 23:00:00 EST 1990

OSTI ID:5844743

Mitchell, Jr, Tyrone D. ^[1]

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1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Previous technology for alumina coating of silicon carbide whiskers was applied to silicon carbide platelets. Process parameters were developed to ensure successful coating of platelets and to produce composites of varying final platelet volume fractions. Coated whisker composites were hot pressed to near full density or pressureless sintered to closed porosity despite high whisker loading. In some cases, pressureless sintering resulted in near full density with high (30 volume percent) whisker loading. Coated platelet composites were hot pressed to near full density and pressureless sintered to closed porosity with high loading (35 vol %). Mechanical properties of these composites were evaluated, including fracture toughness and bend strength.

• Research Organization: Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5844743
• Report Number(s): LBL--30474; ON: DE91012357
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
360603 -- Materials-- Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
COATINGS
COMPOSITE MATERIALS
CRYSTALS
FABRICATION
FRACTURE PROPERTIES
HOT PRESSING
MATERIALS
MATERIALS WORKING
MECHANICAL PROPERTIES
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
POWDERS
PRESSING
SILICON CARBIDES
SILICON COMPOUNDS
SINTERING
WHISKERS