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Homeny, J. Neergaard, Lynn James 2011-05-07T14:07:13Z 2011-05-07T14:07:13Z 10000-01-01 1990 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. Made available in DSpace on 2011-05-07T14:07:13Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9114360.pdf: 5816563 bytes, checksum: 7db0393c17308c1f7826ed74ef6c066b (MD5) Previous issue date: 1990 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:03:08Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:30:05-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9114360 (UMI)AAI9114360 http://hdl.handle.net/2142/23242 eng Copyright 1990 Neergaard, Lynn James Applied Mechanics Engineering, Materials Science Processing, characterization, and mechanical properties of beta silicon nitride whisker/silicon nitride matrix composites text Applied Mechanics Engineering, Materials Science Applied Mechanics Engineering, Materials Science University of Illinois at Urbana-Champaign Dissertation Ph.D.