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Mechanochemically synthesized NbC cermets: Part I. Synthesis and structural development

Published online by Cambridge University Press:  31 January 2011

B. R. Murphy  and
T. H. Courtney
B. R. Murphy
Affiliation:
Department of Metallurgical and Materials Engineering, Michigan Technological University, Houghton, Michigan 49931
T. H. Courtney
Affiliation:
Department of Metallurgical and Materials Engineering, Michigan Technological University, Houghton, Michigan 49931
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Abstract

The mechanochemical synthesis of NbC-based cermets is described. Nanocrystalline NbC is synthesized by room-temperature milling of Nb and graphite (or hexane) mixtures. While some structural coarsening occurs during powder consolidation to full density, a nanoscale structure is maintained. Grinding media wear occurs during milling, and milled powders contain Fe from this abrasion. This phase, homogeneously distributed in milled powders, segregates during consolidation and heat treatment, and a cermetlike microstructure results. Copper added to the powder charge yields NbC–Cu or NbC–Cu-Fe cermets. Copper-containing materials have different phase morphologies. In particular, relatively large NbC particles are dispersed in a matrix containing finer NbC and metal particles. Higher Cu-content materials also develop a pure Cu constituent on heat treatment. A companion paper, “Mechanochemically synthesized NbC cermets: Part II. Mechanical properties,” addresses aspects of the mechanical behavior of these materials.

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Articles
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Journal of Materials Research , Volume 14 , Issue 11 , November 1999 , pp. 4274 - 4284
Copyright
Copyright © Materials Research Society 1999

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