Phase transformation in tungsten carbide–cobalt composite during high temperature treatment in microwave hydrogen plasma

Vesel, Alenka; Mozetič, Miran; Balat‐Pichelin, Marianne

doi:10.1016/j.ceramint.2012.04.058

Cited by 6 publications

(2 citation statements)

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“…In 2013, Altuncu [8] reported a process to remove the cobalt used as a binder in the tools made with tungsten carbide-cobalt, in which a zinc bath is used to immerse the tungsten carbide-cobalt tools. In 2012, Vesel [11] evaluated the phase transformations that occur in parts manufactured with tungsten carbide-cobalt when subjected to thermal treatment at different temperatures using plasma and concentrated radiation. In 2014, Kim [1] studied the behavior of cobalt dissolution in tungsten carbide-cobalt waste.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and kinetic study of the recovery of tungsten and cobalt from tool waste

Sierra-Perez

Rojas-Reyes

Martinez-Zambrano

et al. 2018

Rev.Fac.Ing.Univ.Antioquia

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In the present research work, the recovery of tungsten and cobalt from waste coming from tungsten carbide-cobalt (WC-Co) tools, which are widely used in the metalworking industry, was analyzed. The WC-Co waste was characterized by X-ray diffraction and scanning electron microscopy with microanalysis (SEM/EDS). The process started with the oxidation of the waste to obtain a mixture of oxides (WO 3 and CoWO 4 ). The ΔH and ΔG were calculated both for the oxidation and reduction processes. Thermodynamic and non-isothermal kinetic analyses were carried out to obtain a stability diagram where theoretical and experimental data are defined by transformation lines as a function of temperature; in addition, the apparent activation energy was determined. By a hydrogen reduction process, high-purity tungsten and cobalt in metallic form were obtained. RESUMEN:En el presente proyecto se analiza la recuperación de wolframio y cobalto a partir de residuos de herramientas fabricadas con carburo de wolframio -cobalto (WC-Co), las cuales son muy empleadas en la industria metalmecánica. El residuo de WC-Co se caracterizó por difracción de rayos X y microscopia electrónica de barrido con microanálisis (SEM/EDS). El proceso inició con la oxidación del residuo para obtener una mezcla de óxidos (WO 3 y CoWO 4 ). Se calculó el ΔH y el ΔG tanto para el proceso de oxidación como para el proceso de reducción. Un análisis termodinámico y un análisis cinético no isotérmico entregó una figura donde se combinan datos teóricos y datos experimentales con transformaciones perfectamente delimitadas; además se calculó la energía de activación aparente de este proceso. El proceso de reducción con hidrógeno entregó wolframio y cobalto en forma metálica con alta pureza..

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Section: Introductionmentioning

confidence: 99%

Thermodynamic and kinetic study of the recovery of tungsten and cobalt from tool waste

Sierra-Perez

Rojas-Reyes

Martinez-Zambrano

et al. 2018

Rev.Fac.Ing.Univ.Antioquia

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“…Depending on the type of material, plasma of different parameters is needed in order to accomplish treatment in a reasonable time. Delicate organic materials require cold plasma of low ionization fraction [1] while inorganic materials including alloys, ceramics, and glasses should be treated with moderately or highly ionized plasma [2] in order to benefit from temperature effects. The heating of solid materials exposed to plasma depends on plasma parameters as well as the characteristics of samples to be treated.…”

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confidence: 99%

Exothermic Surface Reactions on Sintered Graphite Upon Exposure to CO<sub>2</sub> Plasma Created in Microwave Discharge

Vesel

Balat‐Pichelin²

2014

IEEE Trans. Plasma Sci.

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Microwave (MW) discharges in a resonant cavity are suitable for sustaining gaseous plasma. An appropriate matching allows for optimization of discharge efficiency so the MW power is used for heating plasma in a small volume where a sample is placed. Such concentrated power dissipation allows for creation of gaseous plasma with high dissociation and moderate ionization fractions. In the case when plasma is created in CO 2 atmosphere, the molecules are highly dissociated and O radicals interact chemically with sintered graphite causing significant etching. Both chemical and physical surface interactions induce extensive heating of samples so such a discharge is suitable for modification of solid materials at elevated temperatures.Index Terms-High-temperature techniques, plasma materials processing, surface treatment.

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Tungsten Carbides

Shabalin

2022

Ultra-High Temperature Materials IV

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Phase transformation in tungsten carbide–cobalt composite during high temperature treatment in microwave hydrogen plasma

Cited by 6 publications

References 14 publications

Thermodynamic and kinetic study of the recovery of tungsten and cobalt from tool waste

Thermodynamic and kinetic study of the recovery of tungsten and cobalt from tool waste

Exothermic Surface Reactions on Sintered Graphite Upon Exposure to CO<sub>2</sub> Plasma Created in Microwave Discharge

Tungsten Carbides

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