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Controlling cobalt capping in sintering process of cermets
AB Sandvik Coromant R&D, S-12680 Stockholm, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics. AB Sandvik Coromant R&D, S-12680 Stockholm, Sweden.
AB Sandvik Coromant R&D, S-12680 Stockholm, Sweden.
2017 (English)In: INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS, ISSN 0263-4368, Vol. 62, p. 126-133Article in journal (Refereed) Published
Abstract [en]

Critical sintering parameters for the formation of cobalt capping on cermets were evaluated experimentally. The results were compared to existing theories regarding cobalt capping formation on cemented carbides. Four different cermets grades were selected. The influence of the carbon activity, the sintering atmosphere (vacuum, flow rate, gas mixture, pressure) and the cooling rate was investigated. The results are in accordance with the observations that the Co surface top-layer forms during a specific short temperature interval during the cooling step for each grade, but it is affected by the preceding conditions; e.g. enhanced by a preceding Co-enrichment in the surface zone in a decarburizing atmosphere. The formation can be inhibited by using a carburizing atmosphere, such as carbon monoxide gas, or a sinter-HIP (hot isostatic pressure) step during cooling. A phenomenological model for formation of Co-capping in cermets considering melting point of alloys, cobalt migration, carbon activities, vapor pressure of reactive elements as well as processing parameters (sintering atmosphere, cooling rate etc.) is discussed.

Place, publisher, year, edition, pages
2017. Vol. 62, p. 126-133
Keywords [en]
Cermets, Sintering, Co-capping, Carbon activity
National Category
Atom and Molecular Physics and Optics Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-360729DOI: 10.1016/j.ijrmhm.2016.06.008ISI: 000390503200007OAI: oai:DiVA.org:uu-360729DiVA, id: diva2:1249108
Available from: 2018-09-18 Created: 2018-09-18 Last updated: 2019-01-21Bibliographically approved

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Englund, Sven

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