Thermodynamic consideration and phase evolution during oxidation of tungsten-copper electrical contactor scraps
IR@NML: CSIR-National Metallurgical Laboratory, Jamshedpur
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Title |
Thermodynamic consideration and phase evolution during oxidation of tungsten-copper electrical contactor scraps
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Creator |
Gharami, Kalpataru
Patra, H R Kumar, Manoj Randhawa, N S |
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Subject |
Metallurgy
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Description |
Present studies account the feasibility studies on isothermal oxidation of W-Cu hard metal electrical contractor scraps for recycling by roasting-leaching method. This was investigated as one of main processes to produce friable oxidized product amenable to subsequent leaching process. Oxidation is facilitated using scrap turnings instead of solid W-Cu contactor rods. The alloy oxidizes to Cu (x) O, WO (x) and CuWO4 upon heating in the temperature range 400-1000A degrees C under oxygen flow. Apart from oxidized W and Cu phases, significant amount of Cu nuggets formed initially at 450A degrees C that rose gravimetrically up to 750A degrees C, and then disappeared at higher temperature. The maximum weight gain was about 22% compared to initial weight when oxidation was carried out at 750A degrees C. Oxidation beyond the temperature of 750A degrees C corresponded to significant loss of tungsten by evaporation of WO2 center dot (OH)(2) gaseous product. Thermal oxidation of W-Cu metal electrical contractor tip scraps produced porous and friable oxidized product of W and Cu.
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Publisher |
Allerton Press Inc
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Date |
2016
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Type |
Article
PeerReviewed |
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Format |
application/pdf
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Identifier |
http://eprints.nmlindia.org/7549/1/Gharami_Kalpataru%2C2016.pdf
Gharami, Kalpataru and Patra, H R and Kumar, Manoj and Randhawa, N S (2016) Thermodynamic consideration and phase evolution during oxidation of tungsten-copper electrical contactor scraps. Russian Journal Of Non-Ferrous Metals, 57(4) (IF-0.204). pp. 361-366. |
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Relation |
https://link.springer.com/article/10.3103/S1067821216040039
http://eprints.nmlindia.org/7549/ |
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