Comparison between microwave and conventional sintering of WC/Co composites

Breval, E.; Cheng, Jiping; Agrawal, Dinesh Kumar; Gigl, Paul; Dennis, M Turriff; Roy, Rustum; Papworth, A. J.

doi:10.1016/j.msea.2004.08.085

Cited by 207 publications

(89 citation statements)

References 11 publications

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“…The grain growth of WC-9Co/1 in general is slightly higher compared to WC-6Co/1 consolidated from the same starting powder but with lower Co content. Co content contributed to the recrystallization and grain growth of near nano-and nanostructured cemented carbides sintered in hydrogen, confirming the role of Co in grain growth, already researched by various scientists [11,[13][14][15]. The smallest grain sizes were measured for WC-6Co/2, 95 nm and the addition of Cr 3 C 2 and VC, but in higher content compared to other mixtures.…”

Section: Density and Microstructural Characteristicssupporting

confidence: 78%

Influence of Grain Growth Inhibitors and Powder Size on the Properties of Ultrafine and Nanostructured Cemented Carbides Sintered in Hydrogen

Fabijanić

Jakovljević

Franz

et al. 2016

Metals

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Abstract:The influence of grain growth inhibitors and powder size on the microstructure and mechanical properties of ultrafine and nanostructured cemented carbides was researched. Three different WC powders, with an addition of different type and content of grain growth inhibitors GGIs, VC and Cr 3 C 2 and with d BET grain sizes in the range from 95 to 150 nm were selected as starting powders. Four different mixtures with 6 and 9 wt. % Co were prepared. The consolidated samples are characterized by different microstructural and mechanical properties with respect to the characteristics of starting powders. Increased sintering temperatures led to microstructural irregularities in the form of a discontinuous WC growth, carbide agglomerates and abnormal grain growth as a consequence of coalescence via grain boundary elimination. The addition of 0.45% Cr 3 C 2 contributed to microstructure homogeneity, reduced discontinuous and continuous grain growth, and increased Vickers hardness by approximately 70 HV and fracture toughness by approximately 0.15 MN/m 3/2 . The reduction of the starting powder to a real nanosize of 95 nm resulted in lower densities, and significant hardness increase, with a simultaneously small increase in fracture toughness. The consolidation of real nanopowders (d BET < 100 nm) solely by conventional sintering in hydrogen without isostatic pressing is not preferred.

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Section: Density and Microstructural Characteristicssupporting

confidence: 78%

Influence of Grain Growth Inhibitors and Powder Size on the Properties of Ultrafine and Nanostructured Cemented Carbides Sintered in Hydrogen

Fabijanić

Jakovljević

Franz

et al. 2016

Metals

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“…In order to achieve the height of 10mm, each sample must weigh 25.5g. The percentage of each powdered sample was based on Breval, Cheng [18]. …”

Section: Methodsmentioning

confidence: 99%

The viability of microwave sintering process to produce a ceramic tool insert

Thauri¹,

Baharudin²,

Leman³

et al. 2016

Int. J. Automot. Mech. Eng.

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Microwave processing of ceramics is fast emerging as a new field of ceramic processing and material synthesis. The past year has witnessed significant progress in the aspects of commercialization and application of the technology in new areas. Due to that reason, several experiments were conducted on microwave heating of ceramics. The aim of the study is to investigate i) whether microwave is a viable alternative to produce sintering parts, ii) the effect of soaking time on the properties of the sample, and iii) the influence of several binders including nickel, ferum, chromium and cobalt to tungsten carbide cermets. The study involved studying the density, hardness and microstructure of the sintered samples. The samples were compacted using an Instron machine at 200 MPa in a cylindrical shape using pallet press with a height of 10 mm and a diameter of 20 mm and sintered in microwave hybrid sintering at 1450°C for two different soaking time (10 min and 20 min). The soaking time of 10 min showed better density, hardness and microstructural results compared to those of 20 min. In comparing between the binders, Ni and Fe (Ni-Fe) showed better results compared to Ni and Cr. While cobalt, nickel and ferum (Co-Ni-Fe) had enhanced results compared to Co and Cr (Co-Cr). Although there are a lot of research studies on several other binders, there is still no finding on the use of microwave hybrid sintering to sinter different mixing binders of tungsten carbide cermets. Therefore, in this research, it is believed that the use of microwave hybrid sintering is viable to sinter tungsten carbide cermets with different binders. The density result showed that each composition of the sintered density was higher compared to green density, which increased by 30% than the green density on average. On the other hand, the hardness results from the commercial cutting tool for tungsten carbide cermet was in the range of 80 to 92 HRA and the highest result for hardness in this research was 84.3 HRA, which means that the insert can be used for commercial use depending on the application.

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“…Microwave sintering of cemented carbides like WC-Co also has been investigated since 1991 after the pioneering work of Cheng (Cheng J, 1991;Cheng JP et al, 1997;Breval E et al, 2005) and thereafter by Porada (Gerdes T & Porada MW, 1994;Rodinger K et al, 1998;Kolaska H et al, 2000). Breval et al (Breval E et al, 2005) investigated on the microwave sintering of 0.1-1 m sized WC particles with cobalt as the binder and compared the results with conventional sintering of the same powders.…”

Section: Microwave Sinteringmentioning

confidence: 99%

“…Breval et al (Breval E et al, 2005) investigated on the microwave sintering of 0.1-1 m sized WC particles with cobalt as the binder and compared the results with conventional sintering of the same powders. They reported that the microwave sintered sample hardly exhibits any growth and the cobalt phase does not reveal any dissolution of tungsten whereas in the conventionally sintered sample, nearly 20% of W had dissolved in the cobalt binder phase.…”

Section: Microwave Sinteringmentioning

confidence: 99%

Advanced Sintering of Nano-Ceramic Materials

Khalil¹

2012

Ceramic Materials - Progress in Modern Ceramics

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Comparison between microwave and conventional sintering of WC/Co composites

Cited by 207 publications

References 11 publications

Influence of Grain Growth Inhibitors and Powder Size on the Properties of Ultrafine and Nanostructured Cemented Carbides Sintered in Hydrogen

Influence of Grain Growth Inhibitors and Powder Size on the Properties of Ultrafine and Nanostructured Cemented Carbides Sintered in Hydrogen

The viability of microwave sintering process to produce a ceramic tool insert

Advanced Sintering of Nano-Ceramic Materials

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