Sub-micron binderless tungsten carbide sintering behavior under high pressure and high temperature

Ma, Dejiang; Kou, Zili; Liu, Yinjuan; Wang, Yongkun; Gao, Shangpan; Luo, Xin; Li, Wentao; Wang, Yonghua; Du, Yangyang; Li, Lei

doi:10.1016/j.ijrmhm.2015.10.001

Cited by 42 publications

(16 citation statements)

References 18 publications

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“…14 shows the formation and evolution of dislocations in WC when the composite is compressed at 873 K. It is observed that before the strain reaching the value corresponding to the yield point of the composite, the numbers of dislocations and stacking faults increase in the strain in the WC grains, which agrees well with the experimental studies (Song et al, 2013;Lewis & Porter, 1969). Densely spaced stacking faults in WC grains were also observed in the experiments at large stress and high temperatures (Ma et al, 2016). The stacking faults can develop very fast and cross through the WC grain, as indicated by 'SF1' in Fig.…”

Section: Figure 10supporting

confidence: 81%

Crystal defects responsible for mechanical behaviors of a WC–Co composite at room and high temperatures – a simulation study

Fang

Liu

et al. 2019

Acta Crystallogr B Struct Sci Cryst Eng Mater

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The microstructure evolution and changes in the structures of crystal defects of the nanocrystalline WC-Co composite in the process of uniaxial compression were studied by simulations at both room and high temperatures. The deformation processes were demonstrated as a function of stress and temperature for the stages prior to and after yielding of the composite. The Peierls stresses were evaluated for Co and WC dislocations with increasing temperature. The deformation mechanisms for each stage of the stress-strain curve were disclosed, in which the effect of temperature was clarified. It was found that with the increase of stress, from elastic deformation to plastic deformation then to yielding of the composite, the dominant mechanisms are grain boundary migration, formation and motion of dislocations in Co, concurrent motion and reaction of dislocations in Co and WC, and then rotation of WC grains in combination with motion of Co and WC dislocations. At the yielding stage, sliding of WC grain boundaries plays an increasingly important role in the contribution to plastic deformation at high temperatures. With strain the proportion of mobile dislocations decreases, and dislocations pile up at triple junctions of WC grains, WC/WC grain boundaries and WC/Co phase boundaries in priority order, leading to the nucleation and propagation of microcracks in these regions.

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Section: Figure 10supporting

confidence: 81%

Crystal defects responsible for mechanical behaviors of a WC–Co composite at room and high temperatures – a simulation study

Fang

Liu

et al. 2019

Acta Crystallogr B Struct Sci Cryst Eng Mater

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“…Full densification is a prerequisite for BTC achieving its intrinsic properties. However, BTC, owing to the absence of any metallic binders, cannot be prepared by classical liquid-phase sintering but consolidated through solid-state sintering with higher temperature, i.e., above 1800 °C, as well as external pressure because of its low self-diffusion coefficients and strong covalent bonds [16][17][18][19]. Thus, it is essential to understand the fundamental of solid-state sintering.…”

Section: Densification Of Binderless Tungsten Carbidementioning

confidence: 99%

Section: Densification Of Binderless Tungsten Carbidementioning

confidence: 99%

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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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“…e final values of hardness were based on their average [32]. e Vickers hardness exhibited a positive correlation with the density, as we recognized [36,37]. e Vickers hardness of the sintered samples increased with the sintering temperature increasing.…”

Section: Vickers Hardness Analysismentioning

confidence: 74%

Microwave Vitrification of Uranium Tailings: Microstructure and Mechanical Property

Wei

Shi

Xie

et al. 2021

Advances in Condensed Matter Physics

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In this work, the dense glass matrix of uranium tailings was successfully fabricated via microwave sintering process with Na2CO3 as a sintering aid. The effects of Na2CO3 additive and sintering temperature on the microstructure and mechanical properties of as-prepared solids were systematically investigated. XRD results confirmed the vitrified forms can be achieved at 1200°C within 30 min with 20 wt.% Na2CO3 addition. Importantly, the Na2CO3 additive significantly reduced the firing temperature from 1500°C to 1200°C and promoted densification. FT-IR analysis demonstrated that the main characteristic peaks of the sintered samples were attributed to the vibration of Si-O-Si. Microstructural studies presented the homogeneous distribution of glass phases. The results of mechanical properties of the sintered forms show that bulk density and Vickers hardness increased with increasing Na2CO3 content as well as sintering temperature, and the highest bulk density (2.45 ± 0.01 g/cm3) and Vickers hardness (823 ± 25 HV) were obtained at the temperature of 1300°C with 20 wt.% Na2CO3 addition, the heating rate of 20°C/min, and the soaking time of 30 min. It implied that the combination of microwave sintering with the appropriate addition of Na2CO3 would provide an efficient method for the immobilization of radionuclides in uranium tailings.

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Sub-micron binderless tungsten carbide sintering behavior under high pressure and high temperature

Cited by 42 publications

References 18 publications

Crystal defects responsible for mechanical behaviors of a WC–Co composite at room and high temperatures – a simulation study

Crystal defects responsible for mechanical behaviors of a WC–Co composite at room and high temperatures – a simulation study

A Review on Binderless Tungsten Carbide: Development and Application

Microwave Vitrification of Uranium Tailings: Microstructure and Mechanical Property

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