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Electrically Conductive and Wear Resistant Si3N4-Based Composites with TiC0.5N0.5 Particles for Electrical Discharge Machining

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Abstract:

Electrically conductive and wear resistant Si3N4-based composites were developed in order to facilitate electrical discharge machining (EDM). The microstructural and mechanical properties of Si3N4-based composites with different amounts of TiC0.5N0.5, fabricated by hot pressing at 1650°C for 1 hour, are investigated and evaluated. The hardness of the micron-sized TiC0.5N0.5 powder based composites increased with increasing TiC0.5N0.5 content from 20 up to 40 vol. %, whereas the bending strength decreased. The fracture toughness reached a maximum at 30 vol. % TiC0.5N0.5 and exhibits a strong anisotropy with respect to the hot-pressing direction. The EDM behaviour of the composites is strongly influenced by the TiC0.5N0.5 content. The composites with a higher TiC0.5N0.5 content have a lower material removal rate but a better surface quality.

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Periodical:

Materials Science Forum (Volumes 492-493)

Pages:

27-32

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.492-493.27

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Online since:

August 2005

Authors:

Dongtao Jiang, Jef Vleugels, Omer Van der Biest, Wei Dong Liu, Raf Verheyen, Bert Lauwers

Keywords:

Composite, Electro Discharge Machining (EDM), Mechanical Property, TiC0.5N0.5

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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