Quantifying the convective drying behaviour of cemented carbide paste extrudates

Ferstl, H.; Wilson, D.I.; Rough, S.L.

doi:10.1016/j.powtec.2019.04.014

Cited by 1 publication

(1 citation statement)

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“…By carefully controlling the temperature cycle and carrier gas velocity, lubricants can be almost completely removed at a suitable rate without unexpected pyrolysis or damaging the compact [58]. Before dewaxing, the paste extrusion rods, bars, or tubes often need drying for several days to volatilize organic solvents [59].…”

Section: Bulk Densification Techniquesmentioning

confidence: 99%

Development of manufacturing technology on WC–Co hardmetals

Nie

Zhang

2019

Tungsten

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Hardmetals are tungsten carbide (WC)-based composites, which are made of WC as a hard phase and transition metals such as Co, Fe, or/and Ni as ductile binder matrices. Their properties can be mainly tailored through the grain sizes of the sintered carbides and the amount of metallic binder. As successful tool materials, hardmetals are widely applied in metal cutting, wear applications, chipless forming, stoneworking, wood, and plastic working. In 2017, about two-thirds of tungsten consumption (including recycled materials) were produced for hardmetals in the world. This paper briefly introduces the development of manufacturing technology on WC-Co hardmetals from three aspects: powder preparation, bulk densification, and performance characterization. Two special WC-Co hardmetals are also described: cobalt-enrichment zone (CEZ) hardmetals, and binderless hardmetals. Furthermore, the development prospects for manufacturing techniques of hardmetals are also presented in the end. Keywords Hardmetal • Ultrafine WC powder • Ultrafine cobalt powder • Extrusion press • Liquid sintering • Cobaltenrichment zone hardmetal • Binderless hardmetal 2 Powder preparation techniques Although WC-Co hardmetals can be made directly with mixing and reactive sintering of tungsten, carbon, and cobalt powders [6], the most commonly used method for preparing Tungsten www.springer.com/42864

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Section: Bulk Densification Techniquesmentioning

confidence: 99%