Near Net-Shape/Net-Dimension ZrC/W-Based Composites with Complex Geometries via Rapid Prototyping and Displacive Compensation of Porosity

Abstract

ZrC/W-based composites with complex shapes have been fabricated by combining rapid prototyping methods for synthesizing porous WC preforms with the shape/dimension-preserving, reactive infiltration-based Displacive Compensation of Porosity (DCP) process. Two automated rapid prototyping methods were examined: (i) computer-numerical-controlled machining of porous WC powder compacts, and (ii) 3D printing of WC powder. After binder removal and partial sintering (to neck the WC particles), the shaped, porous, and rigid preforms were exposed to molten Zr2Cu at 1150-1300°C and ambient pressure. Upon infiltration, the Zr in the melt underwent a displacement reaction with WC to yield more voluminous ZrC and W products that filled prior pores (reaction-induced densification). The resulting ZrC/W-based composites retained the shapes and dimensions (to within 1%) of the WC preforms. This work demonstrates, for the first time, that rapid preform prototyping can be integrated with the DCP process to generate dense, ultrahigh-melting carbide/refractory metal composites with tailorable near net-shapes and -dimensions.

Department(s)

Materials Science and Engineering

Comments

This research was supported by the Air Force Office of Scientific Research (Award No. FA9550-07-1-0115, Dr. Joan Fuller, Program Manager).

Keywords and Phrases

Carbides; Composites; Displacive Compensation of Porosity; Shaping; Wear Parts

International Standard Serial Number (ISSN)

0955-2219

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2010 Elsevier Ltd., All rights reserved.

Publication Date

01 Aug 2010

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