University of Illinois Urbana-Champaign

Processing, characterization, and mechanical properties of beta silicon nitride whisker/silicon nitride matrix composites

Neergaard, Lynn James

This item is only available for download by members of the University of Illinois community. Students, faculty, and staff at the U of I may log in with your NetID and password to view the item. If you are trying to access an Illinois-restricted dissertation or thesis, you can request a copy through your library's Inter-Library Loan office or purchase a copy directly from ProQuest.

Permalink

https://hdl.handle.net/2142/23242

Description

Title
Processing, characterization, and mechanical properties of beta silicon nitride whisker/silicon nitride matrix composites
Author(s)
Neergaard, Lynn James
Issue Date
1990
Doctoral Committee Chair(s)
Homeny, J.
Department of Study
  • Applied Mechanics
  • Engineering, Materials Science
Discipline
  • Applied Mechanics
  • Engineering, Materials Science
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • Applied Mechanics
  • Engineering, Materials Science
Language
eng
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.
Type of Resource
text
Permalink
http://hdl.handle.net/2142/23242
Copyright and License Information
Copyright 1990 Neergaard, Lynn James

Owning Collections

Graduate Dissertations and Theses at Illinois PRIMARY
Graduate Theses and Dissertations at Illinois