Investigation on morphology evolution of coarse grained WC–6Co cemented carbides fabricated by ball milling route and hydrogen reduction route

Su, Wei; Huang, Zhiqiang; Ren, Xiaobing; Chen, Hao; Ruan, Jianming

doi:10.1016/j.ijrmhm.2016.01.001

Cited by 42 publications

(12 citation statements)

References 30 publications

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“…21 and Su et al. 16 The decrease in peak intensity and peak broadening of the WC phase after ball milling can be attributed to increased atomic level strain and refined tungsten carbide grains. For calculation of crystallite size and microstrain, three trails were performed and based on the obtained results, mean, standard deviation and coefficient of variance were calculated and listed in Table 2.…”

Section: Resultsmentioning

confidence: 96%

“…Among the available methods, ball milling is the simple and effective way for the preparation of nanostructured powder, 16 but contamination is one of the major problems seen in this process. Contamination can be eliminated/reduced by using WC-Co hard metal as a milling media for WC-Co powder.…”

Section: Introductionmentioning

confidence: 99%

“…Methods available for the synthesis of nanocrystalline WC-Co powder are mechanochemical synthesis, spraying conversion process, displacement reaction process, co-precipitation, ball milling, and so on. 14 Among the available methods, ball milling is the simple and effective way for the preparation of nanostructured powder, 16 but contamination is one of the major problems seen in this process. Contamination can be eliminated/reduced by using WC-Co hard metal as a milling media for WC-Co powder.…”

Section: Introductionmentioning

confidence: 99%

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Preliminary investigation on development of functionally graded cemented tungsten carbide with solid lubricant via ball milling and spark plasma sintering

Parihar

Setti

Sahu

2017

Journal of Composite Materials

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Functionally graded cemented tungsten carbide belongs to a hybrid Functionally Graded Materials family. However synthesis of functionally graded cemented tungsten carbide is a great challenge due to possibility of “Co migration” and CaF2 vaporization during liquid phase sintering. Hence the present work deals with the development of nanocrystalline materials using ball milling and consolidation of milled material by Spark Plasma Sintering (SPS) for the preparation of functionally graded cemented tungsten carbide. The effects of ball milling and contents of Co, CaF2 and WC on WC/Co/CaF2 powder mixture were analyzed. Grain morphology, particle size, micro-strain, crystallite size, etc. of milled samples were investigated using scanning electron microscopy and X-Ray diffraction techniques. In addition to that, density, microstructure, hardness, fracture toughness and residual stress of consolidated sample are also reported. These tests confirm the formation of nanocrystalline particles and sub-sequent consolidation of functionally graded cemented tungsten carbide with solid lubricant. Hence ball milling with SPS is a prominent and viable process combination for the preparation of functionally graded cemented tungsten carbide.

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Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preliminary investigation on development of functionally graded cemented tungsten carbide with solid lubricant via ball milling and spark plasma sintering

Parihar

Setti

Sahu

2017

Journal of Composite Materials

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“…[1][2][3][4] Unfortunately, when WC cemented carbide is used in water environments, it exhibits poor tribological performance because of the low viscosity of water. In particular, it offers less lubrication, causing the friction coefficient to rise sharply and resulting in very serious wear under conditions in which the friction pair suffers instantaneous overload or frequent start-stop phases.…”

Section: Introductionmentioning

confidence: 99%

Rare earth Ce-modified (Ti,Ce)/a-C:H carbon-based film on WC cemented carbide substrate

2017

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WC cemented carbide suffers severe wear in water environments. A novel carbon-based film could be a feasible way to overcome this drawback. In this study, a rare earth Ce-modified (Ti,Ce)/a-C:H carbon-based film is successfully prepared on WC cemented carbide using a DC reactive magnetron sputtering process. The microstructure, mechanical properties, and tribological behavior of the as-prepared carbon-based film are systematically investigated. The results show that the doping Ti forms TiC nanocrystallites that are uniformly dispersed in the amorphous carbon matrix, whereas the doping Ce forms CeO2 that exists with the amorphous phase in the co-doped (Ti,Ce)/a-C:H carbon-based film. The mechanical properties of this (Ti,Ce)/a-C:H film exhibit remarkable improvements, which could suggest higher hardness and elastic modulus as well as better adhesive strength compared to solitary Ti-doped Ti/a-C:H film. In particular, the as-prepared (Ti,Ce)/a-C:H film presents a relatively low friction coefficient and wear rate in both ambient air and deionized water, indicating that (Ti,Ce)/a-C:H film could feasibly improve the tribological performance of WC cemented carbide in a water environment.

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“…WC-Co cemented carbides are widely used as cutting, machining and rock drilling tools in due to their high hardness and strength, good fracture toughness and wear resistance over a wide range of temperatures 1 . In its simplest form the cemented carbide consists of WC as hard phase and Co as cementing binder phase due to its excellent wetting, adhesion and adequate mechanical properties, however, there are some reasons to substitute it with other metalic binder 2 .…”

Section: Introductionmentioning

confidence: 99%

Study HTHP Sintered WC/Co Hardmetal

et al. 2016

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WC/Co is widely used as cutting tools, because has a unique combination of high strength, hardness, toughness, and moderate stiffness, especially with fine grained WC and finely distributed cobalt. WC/ Co powder mixture sinters by different methods such as vacuum sintering, microwave sintering and SPS. High pressure high temperature (HPHT) sintering is a proposed method that can result in better distribution of cobalt and avoid undesirable phases by using high pressure, high temperature and very short sintering time. In this study, a powder mixture of WC-10 wt% Co was sintered by HPHT at 1500 to 1900ºC under a pressure of 7.7 GPa for 2 minutes. Microstructural/structural analyses were performed by SEM/EDS. Hardness and compression test were also done to obtain the effect of sintering parameters. It was found that HPHT sintering method can be used to produce WC/Co hardmetal with low sintering time and high production rate. It was realized that increasing sintering temperature in HTHP sintering method results in increasing density but hardness and compression strength increase by increasing sintering temperature up to 1800 ºC and then decrease.

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Investigation on morphology evolution of coarse grained WC–6Co cemented carbides fabricated by ball milling route and hydrogen reduction route

Cited by 42 publications

References 30 publications

Preliminary investigation on development of functionally graded cemented tungsten carbide with solid lubricant via ball milling and spark plasma sintering

Preliminary investigation on development of functionally graded cemented tungsten carbide with solid lubricant via ball milling and spark plasma sintering

Rare earth Ce-modified (Ti,Ce)/a-C:H carbon-based film on WC cemented carbide substrate

Study HTHP Sintered WC/Co Hardmetal

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