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Title:Processing, characterization, and mechanical properties of beta silicon nitride whisker/silicon nitride matrix composites
Author(s):Neergaard, Lynn James
Doctoral Committee Chair(s):Homeny, J.
Department / Program:Applied Mechanics
Engineering, Materials Science
Discipline:Applied Mechanics
Engineering, Materials Science
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Applied Mechanics
Engineering, Materials Science
Abstract:Ceramic matrix composites, consisting of $\beta$-$\rm Si\sb3N\sb4$ whisker reinforced polycrystalline $\rm Si\sb3N\sb4$, were fabricated with controlled whisker/matrix interfaces, characterized on the microstructural level, and evaluated for mechanical reliability. As-received and coated $\beta$-$\rm Si\sb3N\sb4$ whiskers were used to reinforce the $\rm Si\sb3N\sb4$ matrices. Whisker coatings were achieved by low pressure chemical vapor deposition of BN. As-received and coated whiskers and as-received powders were characterized using XRD, XPS, SEM, and TEM techniques. Composite microstructures, including the whisker/matrix interfacial zones, were characterized by SEM and TEM. Mechanical properties of the composites, primarily fracture strength and fracture toughness, were measured and compared to those of the unreinforced matrices.
Issue Date:1990
Rights Information:Copyright 1990 Neergaard, Lynn James
Date Available in IDEALS:2011-05-07
Identifier in Online Catalog:AAI9114360
OCLC Identifier:(UMI)AAI9114360

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