NbC as grain growth inhibitor and carbide in WC–Co hardmetals

Huang, Shuigen; Liu, Ruiliang; Li, L.; Biest, Omer Van der; Zhang, Fei

doi:10.1016/j.ijrmhm.2007.09.003

Cited by 124 publications

(56 citation statements)

References 6 publications

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“…The graphite die was wrapped in a carbon cloth to minimize the heat loss from the die surface. The temperature was controlled by an optical pyrometer focused on a central borehole on the upper punch, 1 mm above the top surface of the sample, to give an accurate estimation of the sample temperature [8]. Consolidation of the composite powder assemblies in the axial direction was monitored by following the position of the plunger.…”

Section: Sinteringmentioning

confidence: 99%

“…Compared to micron-sized cemented carbides, sintering of nanosized powders has an additional challenge of retaining the nanoscaled grain size on achieving full density, because of rapid grain growth during liquid phase sintering (LPS) [3], which increases with increased sintering temperature and time. Grain growth can be reduced by pulse electric current sintering (PECS), which allows high degrees of densification at low temperatures within a short sintering time and lower sintering temperatures [6][7][8], and limiting continuous Ostwald ripening [8].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, TiC and NbC improve the chemical stability, preventing diffusion wear during machining [4,8,11]. High temperature hardness can also be improved through NbC, TiC, Mo 2 C [4] and Cr 3 C 2 [12] additions, forming complex carbides which prevent deformation of the cutting edge by WC grain boundary slip [4].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Abrasion wear, thermal shock and impact resistance of WC-cemented carbides produced by PECS and LPS

Genga

Akdogan

Polese

et al. 2015

International Journal of Refractory Metals and Hard Materials

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Section: Sinteringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Abrasion wear, thermal shock and impact resistance of WC-cemented carbides produced by PECS and LPS

Genga

Akdogan

Polese

et al. 2015

International Journal of Refractory Metals and Hard Materials

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“…It were studied in various works some including carbides as grain growth inhibitors to suppress the growth [9][10][11][12] . During sintering the average carbide grain size increases by means of coarsening or Ostwald ripening, i.e.…”

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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“…Some research published in the literature has demonstrated the good potential for employing Nb 2 O 5 and NbC as sintering additives 10 , grain growth inhibitors 11 and reinforcing elements in a ceramic matrix 12 . Addition of Nb 2 O 5 improves densification of alumina at lower sintering temperatures 13 .…”

Section: Introductionmentioning

confidence: 99%

Mechanical performance of alumina reinforced with NbC, TiC and WC

et al. 2012

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The incorporation of refractory hard particles in Al 2 O 3 -based composites may inhibit grain growth of the matrix, which could significantly contribute to mechanical performance of the composite. The present study aimed to investigate the potential use of NbC as alumina reinforcing material, as an alternative to other carbides such as TiC and WC. Alumina was mixed with a fixed carbide concentration of 30 wt.(%) in a ball mill and uniaxially hot-pressed at 1650 °C under a load of 30 MPa in an inert atmosphere. X-ray diffraction revealed no oxidation products were present after the sintering process. Microstructure analyses indicate a homogeneous carbide distribution in the alumina matrix. Results obtained in this study show that alumina reinforced with NbC is a composite material with properties comparable to those of alumina reinforced with WC and TiC, thereby making it good reinforcing material.

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NbC as grain growth inhibitor and carbide in WC–Co hardmetals

Cited by 124 publications

References 6 publications

Abrasion wear, thermal shock and impact resistance of WC-cemented carbides produced by PECS and LPS

Abrasion wear, thermal shock and impact resistance of WC-cemented carbides produced by PECS and LPS

Study HTHP Sintered WC/Co Hardmetal

Mechanical performance of alumina reinforced with NbC, TiC and WC

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