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Hardmetal bulk materials and coatings - Commonalities and differences

: Berger, L.-M.

European Powder Metallurgy Association -EPMA-:
PM in Belgium, a crossroads in industry development. Vol.1: Hard materials : Euro PM 2006 Congress & Exhibition, 23 - 25 October 2006, Ghent, Belgium. Proceedings
Shrewsbury: EPMA, 2006
ISBN: 1-89907-232-2
ISBN: 978-1-89907-232-3
European Congress and Exhibition on Powder Metallurgy (EURO PM) <2006, Ghent>
Conference Paper
Fraunhofer IWS ()
experimentelle Untersuchung; Entwicklungsstand; WC=Wolframcarbid; Cobalt; Nickel; Chrom; Chromcarbid; Titancarbid; Titannitrid; Molybdäncarbid; Molybdännitrid; Hartstoffüberzug; Sauerstoff-Hochgeschwindigkeitsspritzen; Prozeßanalyse; Mikrostruktur; Korngrößenverteilung; optische Mikroskopie; Rasterelektronenmikroskopie; Thermooxidation; Temperatureinfluß; Grenzschicht; Wolframoxid; Hammerschlag; Entkohlen; chemische Zersetzung; energiedispersive Röntgenspektrometrie (EDXS); Konzentrationsverteilung; Geschichte

Hardmetals are traditionally applied as bulk materials and as coatings prepared by thermal spray processes. With progress in the thermal spray technology and improved properties these coatings have gained ever-increasing technical importance and markets. Advanced hardmetal coatings are produced by HVOF (high velocity oxy-fuel) spraying, which is one of the most important in the group of thermal spray processes. This paper presents a short historical survey of hardmetal coating preparation by different thermal spray processes and discusses some historical contact points between bulk hardmetals and hardmetal coatings. The process of hardmetal coating formation is analyzed in order to discuss the commonalities and differences compared to bulk hardmetals. Finally, some new results with focus on oxidation of WC-Co coatings in atmospheric conditions are described. Possible topics of cooperation between hardmetal and coating research and development are identified. This can contribute to the development of new applications of thermally sprayed coatings and hardmetals as composite materials.