Surface oxide debonding in field assisted powder sintering

Authors
Anderson, KR Groza, JR Fendorf, M Echer, CJ
Citation
Kr. Anderson et al., Surface oxide debonding in field assisted powder sintering, MAT SCI E A, 270(2), 1999, pp. 278-282
Citations number
7
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN journal
09215093 → ACNP
Volume
270
Issue
2
Year of publication
1999
Pages
278 - 282
Database
ISI
SICI code
0921-5093(19990930)270:2<278:SODIFA>2.0.ZU;2-R
Abstract
Field activated sintering techniques (FAST) have been applied to two high-t emperature powder materials: tungsten and NiAl. High and atomic resolution electron microscopy (HREM/ARM) of tungsten powder sintered via FAST showed essentially clean boundaries. Analytical transmission electron microscopy ( TEM) of FAST sintered NiAl also showed boundaries free of surface oxide lay er(s). However, small alumina precipitates were found at and near prior par ticle (grain) boundaries. The boundary cleaning and precipitation phenomena are manifestations of an applied pulsed electric field. (C) 1999 Elsevier Science S.A. All rights reserved.