Masters Theses

Abstract

"This research investigates the fabrication of three-dimensional parts from ZrB₂, an ultra high temperature ceramic (UHTC), using the selective laser sintering (SLS) process. Based on an experimental investigation, optimum values for the SLS parameters (scan speed, laser power, energy density, scan spacing and layer thickness), used on a DTM Sinterstation 2000, were determined to build green ZrB₂ parts with high integrity and sharp geometrical features. This was done by melting the polymer binder used to bond the ceramic particles layer-by-layer according to the cross-section of a CAD model. The use of a sacrificial plate to eliminate cracks in the bottom of the part was demonstrated and the proper number of separation layers between the sacrificial plate and the main part was determined experimentally. The fabricated green parts went through post processing steps including binder burnout and sintering in furnaces at appropriate temperature schedules to remove the binder and sinter the ZrB₂ particles. Several test bars were fabricated and determined to have good properties with an average relative density of 87% and an average flexural strength of 250 MPa"--Abstract, page iv.

Advisor(s)

Leu, M. C. (Ming-Chuan)

Committee Member(s)

Hilmas, Greg
Liou, Frank W.

Department(s)

Mechanical and Aerospace Engineering

Degree Name

M.S. in Manufacturing Engineering

Publisher

Missouri University of Science and Technology

Publication Date

2009

Pagination

ix, 59 pages

Note about bibliography

Includes bibliographical references (pages 39-41).

Rights

© 2009 Shashwatashish Pattnaik, All rights reserved.

Document Type

Thesis - Restricted Access

File Type

text

Language

English

Library of Congress Subject Headings

Zirconium compounds -- Extrusion
Rapid prototyping
Ceramic-matrix composites -- Mechanical properties
Ceramic-matrix composites -- Microstructure
Sintering

Thesis Number

T 10209

Print OCLC #

863469194

Electronic OCLC #

908947069

Link to Catalog Record

Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.

http://laurel.lso.missouri.edu:80/record=b10179357~S5

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