Microstructure and mechanical properties of WC–Co, WC–Co–Cr3C2 and WC–Co–TaC cermets fabricated by spark plasma sintering

Siwak, Piotr; Garbiec, Dariusz

doi:10.1016/s1003-6326(16)64390-x

Cited by 46 publications

(29 citation statements)

References 22 publications

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“…The specimens with 1.0 wt% Cr 3 C 2 and TaC show an obviously finer microstructure than those in the specimens with the 0.6 wt% of these additives, even in the WC-6Co-1TaC specimen microstructural defects are also present. It means that increasing the additive contents in the powder mixtures can prevent agglomerations of additive particles and lead to obtaining a fine microstructure without microstructural defects after the spark plasma sintering process, as shown in 15 . The calculated hardness and fracture toughness value of the additive-free WC-6Co and WC-6Co cemented carbides with additives up to 1 wt% are shown in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…Probably one of the reason for carbide agglomerates formation is the mixing process in dry conditions and the resulting segregation. On the other hand, the same mixing process was used for preparing the WC-5Co-2Cr 3 C 2 and WC-5Co-2TaC powder mixtures 15 and no carbide agglomerates were present in the microstructures. Anyway, one of keys to preventing the agglomeration phenomenon might be to use ultrasound in the process of mixing the suspension consisting of the initial powders and liquid as in work 19 , where aluminum and alumina powders were ultrasound mixed using anhydrous methanol.…”

Section: Methodsmentioning

confidence: 99%

“…Siwak and Garbiec in a previous study 15 proved that an addition of 2 wt% Cr 3 C 2 and 2 wt% TaC to WC-5Co cemented carbides increased the hardness from 1512 to 2105 and 1725 HV 30 respectively. The same relationship was confirmed by other authors.…”

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confidence: 99%

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The Effect of Cr3C2 and TaC Additives on Microstructure, Hardness and Fracture Toughness of WC-6Co Tool Material Fabricated by Spark Plasma Sintering

2017

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Spark plasma sintering has been used to successfully produce WC-6Co-xCr 3 C 2 , WC-6Co-xTaC (x = 0.2, 0.6, 1.0) and WC-6Co-xCr 3 C 2 -xTaC (x = 0.1, 0.3, 0.5) cemented carbides. The spark plasma sintered compacts were investigated by scanning electron microscopy, hardness tests and fracture toughness tests. The results were compared to an additives-free WC-6Co cemented carbide consolidated under the same process parameters and commercial ISO K10 inserts. By using Cr 3 C 2 and TaC additives, it is possible to improve the hardness and fracture toughness of WC-Co cemented carbides. The best combination of hardness (1936 ± 15 HV 30 ) and fracture toughness (10.38 ± 0.46 MPa•m 1/2 ) was obtained by the WC-6Co-1Cr 3 C 2 .

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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The Effect of Cr3C2 and TaC Additives on Microstructure, Hardness and Fracture Toughness of WC-6Co Tool Material Fabricated by Spark Plasma Sintering

2017

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“…12 Moreover, adding Cr or Cr 3 C 2 to the Co-Ni composite phase can improve the room-temperature mechanical properties, corrosion resistance, and oxidation resistance of cemented carbides. [13][14] High-entropy alloy, because it can inhibit the WC grain growth, improves the oxidation resistance and mechanical properties of the cemented carbides, so it has become a new cemented carbide binder phase. [15][16][17] The WC-10AlCoCrCuFeNi prepared by Luo et al 18 present good comprehensive mechanical properties, with hardness and fracture toughness of 1922HV 30 and 10.41 MPa•m 1/2 , higher than commercial WC-Co composite materials.…”

Section: Introductionmentioning

confidence: 99%

Effects of composite binder phase on microstructure and mechanical properties of ultrafine‐grained cemented carbides

Wang

Sun

et al. 2020

Int J Applied Ceramic Tech

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In order to develop a new high-performance binder phase, four different alloys Co-Ni-Fe, Co-Ni-Cr, Co-Ni-Nb, and AlCoCrNiNb 0.5 were used as a binder in cemented carbides. The room-temperature mechanical properties and high-temperature flexural strength of cemented carbides were studied. The results show that the optimal mechanical properties for the WC-8(Co-Ni-Fe, Co-Ni-Cr, Co-Ni-Nb, and AlCoCrNiNb 0.5) can be obtained at the sintering temperatures of 1200°C, 1350°C, 1350°C, and 1300°C, respectively. Compared with cemented carbides with Co as binder phase, the hardness of the four kinds of alloys is increased, the WC grain size becomes finer, but the fracture toughness is slightly decreased. When the temperature is under 600°C, there is no visible oxidation of the four kinds of cemented carbides, and their bending strengths are basically not reduced. When the temperature increased from 600°C to 900°C, the WC-8(Co-Ni-Nb) and WC-8(Co-Ni-Fe) samples present the better high-temperature bending resistance compared with the WC-8(Co-Ni-Cr) and WC-8AlCoCrNiNb 0.5 samples, with respective decrease in bending strength of 11.7% and 7.3%. K E Y W O R D S carbides, composite binder phase, mechanical properties, spark plasma sintering How to cite this article: Yu B, Wang Z, Sun N, et al. Effects of composite binder phase on microstructure and mechanical properties of ultrafine-grained cemented carbides.

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“…Today, the tungsten carbide (WC) and cobalt (Co) alloy is a widely spread material for tool making [1]. It is used extensively in machining, mining, and making drilling tools [2,3].…”

Section: Introductionmentioning

confidence: 99%

Comparative studies on mechanical properties of WC-Co composites sintered by SPS and conventional techniques

2017

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Abstract. Spark plasma sintering (SPS) is an extremely fast solidification technique for compounds that are difficult to sinter within the material group metals, ceramics, or composites thereof, SPS uses a uniaxial pressure and a very rapid heating cycle to consolidate these materials. With SPS the main benefit is the ability to control the WC grain size due to the short sintering times at high temperature. Additionally, its allows to avoid negative reactions between WC and cobalt and to minimize the formation of undesirable phases in sintered composites. The WC-6wt.% Co cermet prepared by SPS processing achieves the enhanced mechanical properties with the hardness of 18.3 GPa and the fracture toughness of 15.5 MPa•m 1/2 in comparison to standard reference tungsten carbide/cobalt material.

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Microstructure and mechanical properties of WC–Co, WC–Co–Cr3C2 and WC–Co–TaC cermets fabricated by spark plasma sintering

Cited by 46 publications

References 22 publications

The Effect of Cr3C2 and TaC Additives on Microstructure, Hardness and Fracture Toughness of WC-6Co Tool Material Fabricated by Spark Plasma Sintering

The Effect of Cr3C2 and TaC Additives on Microstructure, Hardness and Fracture Toughness of WC-6Co Tool Material Fabricated by Spark Plasma Sintering

Effects of composite binder phase on microstructure and mechanical properties of ultrafine‐grained cemented carbides

Comparative studies on mechanical properties of WC-Co composites sintered by SPS and conventional techniques

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