Effect of carbon content on the reactive sintering of mixed W-Co-C powders

Azem, Saïd; Grosbras, M.; Yefsah, S.

doi:10.1051/metal:2004163

Cited by 6 publications

(4 citation statements)

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“…The authors in [ 37 ] carried out the sintering process of W-6%Co-C powder mixtures at the temperature of 1500 °C under pressure. Studies have shown that the type of phases obtained depends on the relative content of carbon and cobalt.…”

Section: Resultsmentioning

confidence: 99%

Application of U-FAST Technology in Sintering of Submicron WC-Co Carbides

et al. 2023

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This article presents the microstructure, hardness, fracture toughness coefficient KIC and phase composition of submicron WC-4Co carbides. The carbides were sintered using the innovative U-FAST (Upgraded Field Assisted Sintering Technology) method, from mixtures of WC-Co powders with an average WC grain size of 0.4 µm and 0.8 µm. The obtained sinters were characterized by a relative density above 99% of the theoretical density. The hardness of the obtained composites was above 2000 HV30, while the KIC coefficient was about 8 MPa m1/2.

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Section: Resultsmentioning

confidence: 99%

Application of U-FAST Technology in Sintering of Submicron WC-Co Carbides

et al. 2023

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“…In work [ 36 ], it was shown that during reactive sintering of mixtures of W-6% Co-C powders, the reaction product between these elements depends on the relative carbon and cobalt contents. At a carbon content of 7 wt%, WC carbide forms by itself, and densification occurs in the presence of a cobalt-based liquid phase.…”

Section: Resultsmentioning

confidence: 99%

Properties of WCCo Composites Produced by the SPS Method Intended for Cutting Tools for Machining of Wood-Based Materials

et al. 2021

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This paper presents the possibility of using the Spark Plasma Sintering (SPS) method to obtain WCCo composite materials. Such materials are used as cutting blades for machining wood-based materials. Two series of composites, different in grain size and cobalt content, were analyzed in the paper. The produced materials were characterized using Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), and tribological properties were determined. In addition, preliminary tests were carried out on the durability of the blades made of sintered WCCo composites while machining three-layer chipboard. The results of the microstructure analysis proved that the SPS method makes it possible to obtain solid composites. Phase analysis showed the occurrence of the following phases: WC, Co, and Co3W9C4. The lowest friction coefficient value was found in samples sintered using powder with an average primary particle size of 400 nm (ultrafine).

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“…The other phases like W 2 C or mixed carbides (Co 3 W 3 C) did not appear which is a good progress in the elaboration of this kind of materials. In fact, the existence of these carbides in material is harmful and reduces mechanical resistance of the final product [12]. These carbides play the role of obstacles to the movement of dislocations and consequently decrease the composite ductility.…”

Section: Observation Of Milling Powder Mixturementioning

confidence: 99%

“…Other studies have revealed the coexistence of two types of mixed carbides: M 6 C ( η ) and M 12 C ( ή ) [11]. Petrdlik and Tuma [12] have confirmed the coexistence of two mixed carbides M 6 C and M 12 C equilibrated with other phases at 1425°C. The formation of these carbides is due to the carbon deficiency in the ternary mixture of Co–W–C, and in the contrary case the presence of graphite precipitation causes the formation of mixed carbides in structure [12].…”

Section: Introductionmentioning

confidence: 97%

Microstructural, mechanical and tribological characterization of Co–20 wt% WC composite elaborated by solid-phase sintering of Co–W–C powders mixture

Aouchiche

Alhussein

Nechiche

et al. 2021

Tribology - Materials, Surfaces & Interfaces

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In this paper, we present the synthesis of a Co-WC compound with 80% of cobalt in a single step by sintering powders compacted and previously milled for 10 h. The purpose of this work is to obtain a fine structure avoiding the formation of mixed carbides and reducing the WC/WC interfaces. The original powder mixture contained 80 wt% Co, 13 wt% W and 7 wt% C. The Co-20% WC metal matrix composite was successfully synthesized with a very fine and homogeneous structure. It presented a good wear resistance and showed that increasing the applied load from 5 to 10 N led to decrease the friction coefficient from 0.52 to 0.35 (sample speed = 10 cm/s) and from 0.90 to 0.61 (sample speed = 20 cm/s). The hardness and Young's modulus of Co phase and WC grains, measured by nanoindentation technique, were 0.78/79.9 and 5.78/164.6 GPa, respectively.

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Effect of carbon content on the reactive sintering of mixed W-Co-C powders

Cited by 6 publications

References 0 publications

Application of U-FAST Technology in Sintering of Submicron WC-Co Carbides

Application of U-FAST Technology in Sintering of Submicron WC-Co Carbides

Properties of WCCo Composites Produced by the SPS Method Intended for Cutting Tools for Machining of Wood-Based Materials

Microstructural, mechanical and tribological characterization of Co–20 wt% WC composite elaborated by solid-phase sintering of Co–W–C powders mixture

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