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In situ laser irradiation of WC-Co hard metals inside an SEM. Part 2. Behaviour of the cobalt binder.

In-situ Laserbestrahlung von WC-Co-Hartmetallen in einem Rasterelektronenmikroskop. Tl.2. Verhalten des Kobaltbinders
 

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Journal of Materials Science : JMS 25 (1990), pp.4440-4448
ISSN: 0022-2461
ISSN: 1573-4803
English
Journal Article
Fraunhofer IWS ()
cobalt; hardmetal; Hartmetall; Kobalt; laser surface treatment; Laseroberflächenbehandlung; periodic structure; periodische Struktur; REM; SEM; tungsten carbide; Wolframkarbid

Abstract
Cemented carbides with higher binder contents were irradiated with a CO2-pulse laser within a SEM to investigate the structural development in more detail. The decisive medium is the melting binder which dissolves the refractory carbide phase. In this way a superficial layer of an oversaturated solid solution with highly dispersed secondary carbides is produced. At higher pulse numbers a periodic structure is engraved in the surface by local evaporation as result of a self-amplifying resonance phenomenon.

: http://publica.fraunhofer.de/documents/PX-18077.html