Doctoral Dissertations

Abstract

"It has been observed that the free sintering of ceramic particulate composites is reduced significantly, even at modest volume fractions of the dispersed inclusions. The decrease in the sintering rate might reside in a decrease in the driving force for sintering, a modification of the kinetic factors, or a combination of these. Realistic physical models indicate that the reduction in the driving force is small.

The first task of the research was to determine how dispersed inclusions influenced the creep viscosity of the composite. The results of this phase of the research are described in papers I through III. In the first two papers, the effect of spherical nickel inclusions on the sintering, creep and electrical conductivity of a glass matrix composite was investigated. Glass was chosen as the matrix phase in order to eliminate the complications of grain growth. In the third paper, the effects of zirconia inclusions on the sintering and creep of a polycrystalline matrix (for which grain growth occurs) are reported.

A combination of this work and other studies indicated that the main factors responsible for the sintering difficulty are the packing of the matrix phase and interactions between the inclusions. A method for alleviating the difficulty associated with these factors was developed and used to form particulate composites with nearly full density.

The second task of this research was to measure the mechanical properties of the composites formed by the improved method and to compare the data with those for similar composites formed by more conventional methods. Paper IV reports on the mechanical properties of the sintered composites"--Abstract, page iv.

Advisor(s)

Rahaman, M. N., 1950-

Committee Member(s)

Moore, Robert E., 1930-2003
Anderson, H. U. (Harlan U.)
Huebner, Wayne
Dharani, Lokeswarappa R.

Department(s)

Materials Science and Engineering

Degree Name

Ph. D. in Ceramic Engineering

Sponsor(s)

United States. Air Force. Office of Scientific Research

Comments

Supported by the U. S. Air Force Office of Scientific Research, under Grant No. 90-0267

Publisher

University of Missouri--Rolla

Publication Date

Fall 1992

Journal article titles appearing in thesis/dissertation

  • Sintering, creep and electrical conductivity of model glass matrix composites
  • Creep viscosity of glass matrix composites near the percolation threshold
  • Creep-sintering of polycrystalline ceramic particulate composites
  • Mechanical properties of sintered ceramic particulate composites

Pagination

xv, 111 pages

Note about bibliography

Includes bibliographical references.

Rights

© 1992 Rollie E. Dutton, All rights reserved.

Document Type

Dissertation - Restricted Access

File Type

text

Language

English

Subject Headings

Ceramic-matrix composites -- Mechanical propertiesComposite materials -- FractureCeramics -- Microstructure

Thesis Number

T 6470

Print OCLC #

28620714

Electronic OCLC #

905033357

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