Toxicity in Cemented Carbide Production

Upadhyaya, G. S.

doi:10.1016/b978-081551417-6.50019-8

Cited by 67 publications

(50 citation statements)

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“…[1][2][3] Therefore, due to their practical importance, several studies have been conducted in the last decades to investigate and improve their mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous spark plasma synthesis and consolidation of WC/Co composites

2005

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The single-step synthesis and densification of the WC-6Co cemented carbide starting from elemental powders was obtained by the spark plasma sintering (SPS) technique. The operating conditions that guarantee the complete conversion of the reactants to the desired full dense material have been identified. Specifically, under the application of 800 A and a mechanical pressure of 40 MPa for about 200 s, a product with relative density higher than 99%, hardness of 14.97 ± 0.35 GPa, and 12.5 ± 1.0 MPa m 0.5 fracture toughness was obtained. A kinetic investigation of the SPS process was also performed. It revealed that an intermediate phase, i.e., W 2 C, is the first carbide formed during the carburization process. It was observed that the synthesis and sintering stages take place simultaneously. It was also found that as the applied pulsed current intensity was augmented, the synthesis/sintering time required decreased significantly.

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“…[1][2][3] Therefore, due to their practical importance, several studies have been conducted in the last decades to investigate and improve their mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous spark plasma synthesis and consolidation of WC/Co composites

2005

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“…Further, the microstructure indicated a high proportion of diamond-to-diamond grain boundary bonding. Such ceramic-type grain boundary bonding (equivalent to metallurgical bonds in metallic systems) produces a high contiguity value which is known to result in good mechanical properties in carbide systems [21,22]. The importance of microstructural features in diamond composites is given greater coverage in the next section.…”

Section: Development Of Diamond Compositesmentioning

confidence: 99%

Microstructural Characterisation and Wear Behaviour of Diamond Composite Materials

Boland

2010

Materials

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Since the initial research leading to the production of diamond composite materials, there have been several important developments leading to significant improvements in the properties of these superhard composite materials. Apart from the fact that diamonds, whether originating from natural resources or synthesised commercially, are the hardest and most wear-resistant materials commonly available, there are other mechanical properties that limit their industrial application. These include the low fracture toughness and low impact strength of diamond. By incorporating a range of binder phases into the sintering production process of these composites, these critically important properties have been radically improved. These new composites can withstand much higher operating temperatures without markedly reducing their strength and wear resistance. Further innovative steps are now being made to improve the properties of diamond composites by reducing grain and particle sizes into the nano range. This review will cover recent developments in diamond composite materials with special emphasis on microstructural characterisation. The results of such studies should assist in the design of new, innovative diamond tools as well as leading to radical improvements in the productivity of cutting, drilling and sawing operations in the exploration, mining, civil construction and manufacturing industries.

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“…Cemented carbides represent a class of sintered composites consisting of a hard carbide phase and a tough metallic binding phase [1,2]. The microstructure and mechanical properties of these materials are strongly influenced by the nature and content of the binder and carbide phase, as well as the processing parameters [3,4].…”

Section: Introductionmentioning

confidence: 99%