Development and Application of WC-Based Alloys Bonded with Alternative Binder Phase

Sun, Jialin; Zhao, Jun; Gong, Feng; Ni, Xiaowu; Li, Zuoli

doi:10.1080/10408436.2018.1483320

Cited by 52 publications

(31 citation statements)

References 129 publications

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“…Cobalt (Co) is the mostly employed binder phase during the conventional sintering process due to a combination of fundamental synergistic reasons including its favorable wettability on tungsten carbide, interfacial bonding strength between WC and Co, the plasticity of Co phase in the composite, and its own strength and wear resistance [ 6 , 7 ]. However, its usage yields the deteriorations in hardness and oxidation/corrosion resistance along with elevated temperature performance owing to the inferior chemical characteristics of cobalt to the carbide phase.…”

Section: Introductionmentioning

confidence: 99%

A Review on Binderless Tungsten Carbide: Development and Application

et al. 2019

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HIGHLIGHTS• Establish processing-composition-microstructure-property relationships governing binderless tungsten carbide (BTC).• Highlight the densification improving strategies and toughening methods for BTC.• Provide key challenges as well as the outlook for superior peformance associated with BTC.ABSTRACT WC-Co alloys have enjoyed great practical significance owing to their excellent properties during the past decades. Despite the advantages, however, recently there have been concerns about the challenges associated with the use of Co, i.e. price instability, toxicity and properties degeneration, which necessitates the fabrication of binderless tungsten carbide (BTC). On the other hand, BTC or BTC composites, none of them, to date has been commercialized and produced on an industrial scale, but only used to a limited extent for specialized applications, such as mechanical seals undergoing high burthen as well as high temperature electrical contacts. There are two challenges in developing BTC: fully densifying the sintered body together with achieving a high toughness. Thus, this review applies towards comprehensively summarize the current knowledge of sintering behavior, microstructure, and mechanical properties of BTC, highlighting the densification improving strategies as well as toughening methods, so as to provide reference for those who would like to enhance the performance of BTC with better reliability advancing them to further wide applications and prepare the material in a way that is environment friendly, harmless to human health and low in production cost. This paper shows that the fabrication of highly dense and high-performance BTC is economically and technically feasible. The properties of BTC can be tailored by judiciously selecting the chemical composition coupled with taking into careful account the effects of processing techniques and parameters.

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Section: Introductionmentioning

confidence: 99%

A Review on Binderless Tungsten Carbide: Development and Application

et al. 2019

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“…%Fe+2 wt.%Ni)), above which both trends reversed as the Fe/Co ratio continued to increase. These complex trends are attributable to Fe addition on the one hand lowering the temperature for liquid formation [16], but on the other hand also lowering the wettability of the WC grain in the liquid phase [24,25]. Figure 2 shows the XRD patterns of the five WC-10 wt.%(Co+Fe+Ni) cemented carbides sintered with different Fe/Co ratios.…”

Section: Resultsmentioning

confidence: 99%

A comparative study of the dry sliding wear of WC-10wt.%(Co+Fe+Ni) cemented carbides pressureless sintered with different Fe/Co ratios

Djematene

Djerdjare

Boukantar

et al. 2020

Journal of Asian Ceramic Societies

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Compositional effects on the dry sliding wear resistance of micrometer-grained WC-10 wt.%(Co +Fe+Ni) cemented carbides pressureless sintered with 2 wt.% Ni but different Fe/Co ratios were investigated. Their microstructures are very similar except for the contiguity of the WC grains, which increased with increasing Fe/Co ratio. Also, these cemented carbides are all almost fully dense, but with the degree of residual porosity exhibiting a complex trend with increasing Fe/Co ratio (first decreasing and then increasing). The greatest densification was reached for an Fe/Co ratio of 1. The reverse trend was observed for the hardness, which reached HV 10 =1090 kg/mm 2 for Fe/Co = 1, indicative that it is dictated essentially by the porosity. The wear resistance correlated inversely with the porosity (and thus directly with the hardness), so that the densest (and thus the hardest) of these cemented carbides (the one sintered with a Fe/Co ratio of 1) also exhibited the lowest coefficients of friction, the lowest specific wear rates, and the lowest microstructural damage. The wear mode was abrasion, with the wear mechanism being plastic deformation and especially fracture. Thus, optimization of the wear resistance of WC-(Co+Fe+Ni) cemented carbides for tribological applications is feasible by a judicious design of their binder composition.

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“…For example, except the Fe, Ni, and Co, there are Co-Ni, Co-Ni-Fe, Co-Ni-Cr, Co-Ni-Mo, and other composite binder phases. [9][10] Previous studies have demonstrated that adding Ni to Co can improve the corrosion resistance of the alloy and that the appropriate content of Ni instead of Co can inhibit WC grain growth. 11 Meanwhile, WC-Co-Ni-Fe has superior fracture toughness and lower sintering temperature than WC-Co, but the bending strength reduces slightly.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, in order to modify and optimize the performance of cemented carbide, a lot of research has focused on the continuous optimization and improvement of the type of binder phase. For example, except the Fe, Ni, and Co, there are Co‐Ni, Co‐Ni‐Fe, Co‐Ni‐Cr, Co‐Ni‐Mo, and other composite binder phases 9‐10 . Previous studies have demonstrated that adding Ni to Co can improve the corrosion resistance of the alloy and that the appropriate content of Ni instead of Co can inhibit WC grain growth 11 .…”

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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Development and Application of WC-Based Alloys Bonded with Alternative Binder Phase

Cited by 52 publications

References 129 publications

A Review on Binderless Tungsten Carbide: Development and Application

A Review on Binderless Tungsten Carbide: Development and Application

A comparative study of the dry sliding wear of WC-10wt.%(Co+Fe+Ni) cemented carbides pressureless sintered with different Fe/Co ratios

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

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