Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1604370 | International Journal of Refractory Metals and Hard Materials | 2009 | 6 Pages |
Abstract
Graded metal-carbide composites were produced by solid state transformations in Ni samples, which were coated with VC by thermally activated chemical vapor deposition (CVD) onto a Ni substrate, followed by heat treatments. CVD produced a multi layer coating, an inner M2C layer and an outer V-Ni-C solid solution, with randomly dispersed M2C particles. Also, a V enriched Ni substrate converted to Ni2V and/or Ni3V intermetallics, up to a depth of about 15 μm. Further heat treatments reduced the amount of intermetallics, and precipitated M8C7 that increased with time. These phase transformations were very intense above the order-disorder transformation temperature for the Ni3V intermetallic (1045 °C), and drastically changed the microstructure, producing a cermet layer, i.e., M8C7 precipitated particles in a Ni matrix. The observed microstructural modifications suggest the possibility of tailoring a graded material for wear control, conformed by an external thin carbide layer, followed by a thicker cermet zone.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
A. Ruiz, I.C. Grigorescu, L. Matamoros, C. Rojas, D. Morel,