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Keramische Zeitschrift

, Volume 67, Issue 7, pp 365–376 | Cite as

Feinst- und Ultrafeinkornhartmetalle — vom Pulver zum Werkzeug

  • W. Schubert
Pulvermetallurgie — Forschung und Technik
  • 28 Downloads

Kurzfassung

Der Marktanteil von Hartmetallen mit submikronem Werkstoffgefüge ist über die vergangenen Jahre stetig gestiegen und liegt aktuell bei etwa 50 % des Gesamtbedarfs. Ausschlaggebend für diese markanten Änderungen am Werkzeugmarkt waren die überzeugenden Leistungssteigerungen der feinkörnigen Sorten gegenüber konventionellen Legierungen, die im Wesentlichen auf die Entwicklung geeigneter feiner Carbidpulver, aber auch auf rigorose Umstellungen in der Hartmetallindustrie hin zu modernen Fertigungstechniken zurückzuführen waren. Der vorliegende Beitrag widmet sich den Fragen der Technologie der Pulverherstellung, der Wahl geeigneter Kornwachstumshemmer, der Grenze der erreichbaren Gefügefeinheit, der Entwicklung der Werkstoffeigenschaften sowie der Frage der Zweckmäßigkeit alternativer Verdichtungsverfahren. Darüber hinaus werden aktuelle Beispiele für Anwendungen im Bereich der Feinstkorn- und Ultrafeinkornhartmetalle demonstriert.

Stichwörter

Feinstkornhartmetalle Festigkeit und Gleichmäßigkeit lokales Kornwachstum Ultrafeinkornhartmetall nanokristallines WC Pulver 

Submicron and Ultrafine Hardmetals: from Powder to Tools

Abstract

The market share of hardmetals with submicron microstructures has steadily increased over the past years and has currently achieved a level of more than 50 % of the total demand. The striking changes on the tool market originated from improved tool performance of the finer grades as compared to conventional materials. The development of a new generation of fine and very uniform WC powder grades as well as rigorous efforts of the hardmetal industry towards modern production engineering have been the main drivers. The present article discusses the technologies of current WC powder manufacturing, the state-of-the-art in hardmetal fineness and uniformity, the occurrence of defects, the selection of growth inhibitors and the actual limits in achievable microstructural fineness. In addition, the perspectives of alternative consolidation processes for getting even finer are considered, and several attractive examples for application of tools based on submicron and ultrafine hardmetals are demonstrated.

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Copyright information

© Springer Fachmedien Wiesbaden 2015

Authors and Affiliations

  1. 1.Institut für Chemische Technologien und AnalytikTU WienWienAustralia

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