Modes of failure of cemented tungsten carbide tool bits (WC/Co): A study of wear parts

Katiyar, Prvan Kumar; Singh, Prince Kumar; Singh, Rityuj; Kumar, A. lava

doi:10.1016/j.ijrmhm.2015.06.018

Cited by 122 publications

(33 citation statements)

References 49 publications

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“…This substantiates the improvement in the oxidation of WC-10Co upon increasing the concentration of ammonia, certainly by the conversion of W and Co into corresponding soluble species, according to Eqs. (2)(3)(4)(5). The dependence of the electro-dissolution tendency of tungsten was found on the diffusion of OHions in a strong alkaline solution [38].…”

Section: Polarization Of Wc-10co In Nh3-h2omentioning

confidence: 99%

“…Cemented tungsten carbide (WC) possesses a wonderful combination of very high hardness and good fracture toughness, hence, it is the material of choice for mining and tunneling equipments. However, during the period of use, it also undergoes wear and corrosion, leading to failure [1][2]. The end-of-life or rejected tungsten carbide hard metal components offers an excellent resource of tungsten and cobalt.…”

Section: Introductionmentioning

confidence: 99%

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Potentiodynamic Polarization Behavior and Microscopic Examination of Tungsten Carbide Hard Metal Materials in Supported Ammoniacal Medium

Randhawa¹,

Katiyar²

2020

Port. Electrochim. Acta

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Electrochemical methods for the recycling of tungsten carbide (WC-10Co) resources suffer from passivation in the acidic medium caused by WO3 and also in NaOH electrolytes, due to hydroxide formation. We found that an ammoniacal solution is a promising electrolyte for sustainable electrochemical dissolution of both tungsten (W) and cobalt (Co). The ammoniacal medium performs greatly when supported with Cl-, SO4 2and CO3 2ions. Poor dissolution/corrosion tendency of WC-10Co in a diluted NH4OH solution enhanced many folds in the presence of Cl-, SO4 2and CO3 2ions. Among these supporting ions, Clemerged as the most suitable for the electrochemical leaching of W and Co from the WC-10Co, accompanying the least noble behavior of WC-10Co. An electrolyte composed of 150 g/L of ammonia and 5% (w/v) of NH4Cl yielded the maximum anodic current density. Microscopic examination of the electrochemically treated samples shows scattered active sites responsible for the oxidative dissolution of WC-10Co. The usefulness of W and Co dissolution in ammonia-additive salt followed the order NH4OH-NH4Cl>NH4OH-(NH4)2SO4>NH4OH-(NH4)2CO3..

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Section: Polarization Of Wc-10co In Nh3-h2omentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Potentiodynamic Polarization Behavior and Microscopic Examination of Tungsten Carbide Hard Metal Materials in Supported Ammoniacal Medium

Randhawa¹,

Katiyar²

2020

Port. Electrochim. Acta

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“…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. [5,6] Therefore, enhancing the surface of WC cemented carbide so as to eliminate these problems in water environments is of significant importance. Diamond-like carbon (DLC) films possess high hardness, low friction, and high wear resistance.…”

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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“…Los carburos cementados o metales duros son uno de los materiales compuestos con mayor éxito que se hayan diseñado, los cuales poseen características químicas y térmicas sobresalientes; así como propiedades de dureza, resistencia a la abrasión y erosión excepcionales (Katiyar, Singh, Singh & Kumar, 2016). Esta combinación de propiedades se debe a que estos materiales compuestos están formados por metales de transición refractarios y frágiles como WC, TiC, TaC, Cr 3 C 2 o Mo 2 C los cuales están combinados con una fase metálica (matriz) compuesta principalmente por Co, Ni, Fe (Upadhyaya, Sarathy & Wagner, 2001;Chan & Chan, 2014).…”

Section: Introductionunclassified

“…El papel fundamental de la fase cerámica es dotar al material de resistencia mecánica y dureza; mientras que la fase metálica protege la fase cerámica, logrando aumentar considerablemente la ductilidad, tenacidad y reducir la posibilidad de fractura frágil del material compuesto (Vinicius et al, 2011). Este tipo de materiales ha sido el preferido durante muchos años para aplicaciones de alta exigencia como herramientas de corte, procesos en sectores de minería (oil&gas), entre otros (Katiyar, Singh, Singh & Kumar, 2016;Gant, Gee, Gohil & Jones , 2013).…”

Section: Introductionunclassified

Pulvimetalurgia: Proceso sostenible para la fabricación de carburos cementados en Colombia

et al. 2017

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En este trabajo se da a conocer la oportunidad de impulsar la industria colombiana hacia el desarrollo de nuevos materiales de altas prestaciones fabricados por vías pulvimetalúrgicas (PM) como alternativa a los procesos de fabricación convencional, generando nuevas necesidades para la industria nacional. El objetivo es describir el proceso de fabricación de materiales compuestos, tipo CERMET, formado por una fase CERámica la cual es carburo de wolframio (WC) y una fase METálica que es el cobalto (Co) y analizar los cambios a nivel microestructural de los materiales fabricados utilizando el proceso de sinterización en vacío. La aleación diseñada fue una mezcla de 88%WC y 12%Co de designación ISO K40; el proceso involucró el control de los materiales precursores que se encuentran en forma de polvo, seguido de los procesos de mezcla y molienda, para luego realizar la compactacióny sinterización. Se estudian las microestructuras y composiciones químicas obtenidas mediante microscopía electrónica de barrido (SEM-EDS); con el fin de evaluar el comportamiento mecánico del CERMET fabricado, se realizaron ensayos de microdureza alcanzando valores de 1289HV0.5 que se correlaciona con los bajos niveles de porosidad obtenidos de tipo A02, B00, C00, y tamaño de grano medio de 1,14 μm. Estos resultados indican que es posible fabricar materiales con altas prestaciones de resistencia al desgaste en el país. Se resalta la importancia que tiene potenciar la sinergia entre entidadesgubernamentales como SENA-Colciencias –Universidad Nacional para generar investigación aplicada en el país.

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Modes of failure of cemented tungsten carbide tool bits (WC/Co): A study of wear parts

Cited by 122 publications

References 49 publications

Potentiodynamic Polarization Behavior and Microscopic Examination of Tungsten Carbide Hard Metal Materials in Supported Ammoniacal Medium

Potentiodynamic Polarization Behavior and Microscopic Examination of Tungsten Carbide Hard Metal Materials in Supported Ammoniacal Medium

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

Pulvimetalurgia: Proceso sostenible para la fabricación de carburos cementados en Colombia

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