Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

German, Randal M.

Committee Member

Berry, John T.

Committee Member

Park, Seong Jin

Date of Degree

12-15-2007

Document Type

Graduate Thesis - Open Access

Major

Mechanical Engineering

Degree Name

Master of Science

College

James Worth Bagley College of Engineering

Department

Department of Mechanical Engineering

Abstract

If an expensive part such a turbine blade or high quality tool needed to be refurbished instead of discarded, the part would have be coated in a way that would resemble or even exceed its previous surface properties. In this regard, this work studies a tungsten carbide-nickel braze alloy hardface composite prepared by liquid infiltration. A unique polymeric binder system was used to form the brazing cloth which formed the carrier for the tungsten carbide and nickel braze alloy particles. After thermal pyrolysis of the binder, the nickel braze alloy would infiltrate into a porous tungsten carbide layer becoming a hard surface coating or hardfacing. These brazing cloths were formulated to achieve a theoretical full density coating after the infiltration process. The hardface would also be brazed to its base substrate. In this study, infiltration of a porous material and brazing are mated in one continuous process. The goal of this research is the measure of hardfacing in relations to powder-polymer processing, infiltration of porous materials and brazing cycles to achieve superior hardness and braze interface quality.

URI

https://hdl.handle.net/11668/17216

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