Author

Dale Brewe

Publication Date

1986

Document Type

Dissertation/Thesis

First Advisor

Shaffer, John C., 1938-2017

Degree Name

M.S. (Master of Science)

Department

Department of Physics

LCSH

Boron carbide||Crystal lattices||Vapor-plating

Abstract

Rhombohedral boron carbide was deposited onto graphite substrates by a reaction between BCl₃, CCl₄, and H₂ at temperatures from 1000°C- 1275°C. The substrates were heated by r.f. induction and by placement inside a modified Astro Industries resistance furnace. Experimental parameters were varied to test their effects on composition of deposits and crystallite size. Deposits were obtained with compositions ranging from ~9 at.%C to ~20 at.%C. The largest crystallites obtained were approximately .1 mm in length with compositions of ~20 at.%C. Lattice constant calculations were made from Debye-Scherrer data obtained from the deposited samples and from sintered samples supplied by G. A. Technologies and compared to results in the literature. Possible explanations were considered for the inconsistency in the available data concerning the dependence of the lattice constants on composition. There are three probable reasons for the inconsistency: 1) failure to allow solid state reactions to continue to completion, 2) pressure dependence of the crystal structure, and 3) inaccuracies in compositions obtained by chemical analysis. However, it was impossible to conclude from the available information whether any or all of these reasons are definitely responsible.

Comments

Bibliography: pages [73]-75.

Extent

75 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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