Doctoral Dissertations
Abstract
"The ability to control the microstructure during the sintering process is critical to the production of ceramics for advanced technological applications. In many cases, conventional ceramic processing techniques are inadequate for achieving the required level of microstructural control. In the present work, chemical precipitation techniques were investigated for the production of ceramics with controlled microstructure. The results of the research are described in three papers.
The first paper is concerned with the synthesis of nanocrystalline powders (10-15nm) of CeO2 and Y2O3-doped CeO2 by chemical precipitation under hydrothermal conditions and the conversion of the powder into the thin films and bulk solids. The factors controlling the stabilization of the particles in suspensions, the preparation of thin films by spin coating or dip coating and the sinterability of the films were investigated. In the second paper, microstructural control during the reaction sintering of a model ZnO-Al2O3 system is considered. For powder mixtures prepared by mechanical mixing, the solid-state reaction occurring during the firing process leads to a disruption of the particle packing and a significant reduction in the sintering rate. The use of coated powders (prepared by heterogenous precipitation) for alleviating the sintering difficulties was investigated. The third paper describes the application of the fabrication route based on the use of coated powders for the production, by free sintering, of SiC platelet reinforced Al2O3 composites.
In addition to the work described above, the preparation of ultrafine M0Si2 powders by reactive high-speed milling and the sinter ability of the consolidated powders were investigated. This work has been published and is included as an appendix"-- Abstract, p. iv
Advisor(s)
Rahaman, M. N., 1950-
Committee Member(s)
Moore, Robert E., 1930-2003
Anderson, H. U. (Harlan U.)
Dharani, Lokeswarappa R.
Roach, D. Vincent
Department(s)
Materials Science and Engineering
Degree Name
Ph. D. in Ceramic Engineering
Publisher
University of Missouri--Rolla
Publication Date
Fall 1995
Journal article titles appearing in thesis/dissertation
1. Pages 42-71 have been accepted for publication in the Journal of the American Ceramic Society
2. Pages 1-41 and 72-92 will be submitted for publication in the Journal of the European Ceramic Society
3. Pages 93-106 have been published in the Ceramic Engineering and Science Proceedings
Pagination
xiv, 108 pages
Note about bibliography
Includes bibliographical references.
Rights
© 1995 Xi Yang, All rights reserved.
Document Type
Dissertation - Restricted Access
File Type
text
Language
English
Thesis Number
T 7077
Print OCLC #
35659548
Recommended Citation
Yang, Xi, "Chemical Precipitation Techniques for the Production of Ceramics with Controlled Microstructure" (1995). Doctoral Dissertations. 1114.
https://scholarsmine.mst.edu/doctoral_dissertations/1114
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