Masters Theses

Date of Award

12-2008

Degree Type

Thesis

Degree Name

Master of Science

Major

Materials Science and Engineering

Major Professor

William H. Hofmeister

Committee Members

Jacqueline Anne Johnson, Lloyd M. Davis, William H. Hofmeister

Abstract

The objective of the present study was to laser process a refractory metal – refractory carbide alloy based on W-Ti-C ternary system for severe service applications. The key concept was to cast a eutectic alloy of tungsten and titanium carbide/carbonitride straight from the melt through laser materials processing route. In the present study, a WTi- C ternary alloy has been laser processed into three-dimensional objects and surface protective coatings. Two novel fabrication systems were designed to build threedimensional objects, namely tower nozzle solid freeform fabrication system and axissymmetric laser powder deposition system. W-Ti-C alloy based protective coatings were deposited on graphite substrates, through laser melting of pre-placed powder mixture, to widen the use of carbon structural elements for high temperature applications. A method for depositing W-Ti-C alloy on steel using multi-intermediate layers strategy is discussed and the preliminary results are presented in this study.

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