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Solid-state solubilities of grain -growth inhibitors in WC-Co and WC-MC-Co hardmetals ArchiMer
Lauter, Lukas; Hochenauer, Roman; Buchegger, Christoph; Bohn, Marcel; Lengauer, Walter.
The solubilities of the most common grain -growth inhibitors (GGIs) Cr, V, Ta, Mo, Nb, Zr and certain combinations there of in the binder phase of WC-Co hardmetals as well as hardmetals of the type WCTiC-TiN-TaC-NbC-Co containing an fcc MC carbide (or carbonitride) phase "MC"("WC-MC-Co" hardmetals) were analysed by means of WDS-EPMA. The carbon potential of the binder phase was fixed at its highest and lowest maxima by the presence of either graphite or eta (M6C) phases. In case of low-carbon hardmetals the composition of M6C, and in the MC-containing hardmetals the composition of the MC phase, was analysed. Two types of solubilities were determined. The first type was measured after controlled cool-down from liquid-phase sintering temperature and...
Tipo: Text Palavras-chave: Hardmetal; Cemented carbides; Grain-growth inhibitor; Nitrogen; Binder phase; Solubility; EPMA.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00332/44332/44155.pdf
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Diffusion parameters of grain-growth inhibitors in WC based hardmetals with Co, Fe/Ni and Fe/Co/Ni binder alloys ArchiMer
Buchegger, Christoph; Lengauer, Walter; Bernardi, Johannes; Gruber, Jakob; Ntaflos, Theo; Kiraly, Franz; Langlade, Jessica.
The diffusion behaviour of the grain-growth inhibitors (GGI) Cr and V during early sintering stages from 950-1150 °C was investigated by means of diffusion couples of the type WC-GGI-binder/WC-binder. Besides Co, also alternative Fe/Ni and Fe/Co/Ni binder alloys were investigated. It was found that the diffusion in green bodies differs significantly from sintered hardmetals. Diffusivities in the binder phase were determined from diffusion couples prepared from model alloys and were found to be almost equal for Co and alternative binder alloys. The diffusion parameters determined from green bodies allowed to estimate the GGI distribution in a hardmetal during heat up. This was subsequently used to estimate an appropriate grain size of VC and Cr3C2 in...
Tipo: Text Palavras-chave: Hardmetal; Early sintering stage; Grain-growth inhibitor; Diffusion; Alternative binder.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00194/30491/28896.pdf
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