Doctoral Dissertations

Sumin Zhu

Keywords and Phrases

Diborides

Abstract

"The first part of this dissertation was aimed at studying the densification of ZrB₂ ceramics by pressureless sintering techniques. Various processes have been applied to coat ZrB₂ powders with polymer precursors, which were used to produce C after charring. After sintering at 1900⁰C, relative density increased of ~70% for uncoated ZrB₂ to >99% for ZrB₂ coated with at least 1.0 wt% C. Thermodynamic analysis suggested that C reacted with and removed oxide impurities (ZrO₂ and B₂O₃) that were present on the ZrB₂ particle surfaces, which promoted densification by minimizing grain coarsening"--Abstract, page iv.

Advisor(s)

Hilmas, Greg
Fahrenholtz, William

Committee Member(s)

Miller, F. Scott, 1956-
Brow, Richard K.
Switzer, Jay A., 1950-

Department(s)

Materials Science and Engineering

Degree Name

Ph. D. in Ceramic Engineering

Sponsor(s)

National Science Foundation (U.S.)

Publisher

Missouri University of Science and Technology

Publication Date

Fall 2008

Journal article titles appearing in thesis/dissertation

  • Pressureless sintering of carbon-coated zirconium diboride powders
  • Pressureless sintering of zirconium diboride using boron carbide and carbon additions
  • Enhanced densification and mechanical properties of ZrB₂-SiC processed by a preceramic polymer coating route
  • Influence of silicon carbide particle size on the microstructure and mechanical properties of zirconium diboride-silicon carbide ceramics
  • Elevated temperature strength of hot pressed zirconium diboride ceramics

Pagination

xiv, 180 pages

Note about bibliography

Includes bibliographical references.

Rights

© 2008 Sumin Zhu, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Subject Headings

Ceramic materials -- Mechanical properties
High temperatures
Silicon carbide
Sintering
Zirconium

Thesis Number

T 9473

Print OCLC #

313791633

Electronic OCLC #

814384257

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