Title

Reaction Processing of Ultra-high Temperature W/Ta₂C-based Cermets

Abstract

A reactive processing method was used to produce dense (>99.5% relative density) W/Ta2C/Ta2WO8 cermets from Ta2O5, WC, TaC, and phenolic resin. the powder compacts were reacted under vacuum at 1450°C and then densified at 1850°C. the microstructure of the cermets was examined using scanning electron microscopy and found to contain fine grains on the order of 1-3 μm in diameter. X-ray diffraction, transmission electron microscopy, and parallel energy electron loss spectroscopy were used to identify the composition and structure of the phases in the composites. the composites were found to contain approximately 47.5 wt% W, 47.3 wt% Ta2C, and 5.2 wt% Ta2WO8. Crack-free and dense W/Ta2C-based cermets were prepared by an in situ reactive sintering process without the application of pressure during densification.

Department(s)

Materials Science and Engineering

Sponsor(s)

United States. Department of Education. Graduate Assistance in Areas of National Need

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2009 Wiley-Blackwell, All rights reserved.

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