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2006
Conference Paper
Titel
Hardmetal bulk materials and coatings - Commonalities and differences
Abstract
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.
Language
English
Tags
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experimentelle Untersuchung
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Entwicklungsstand
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WC=Wolframcarbid
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Cobalt
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Nickel
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Chrom
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Chromcarbid
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Titancarbid
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Titannitrid
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Molybdäncarbid
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Molybdännitrid
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Hartstoffüberzug
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Sauerstoff-Hochgeschwindigkeitsspritzen
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Prozeßanalyse
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Mikrostruktur
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Korngrößenverteilung
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optische Mikroskopie
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Rasterelektronenmikroskopie
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Thermooxidation
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Temperatureinfluß
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Grenzschicht
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Wolframoxid
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Hammerschlag
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Entkohlen
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chemische Zersetzung
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energiedispersive Röntgenspektrometrie (EDXS)
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Konzentrationsverteilung
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Geschichte