ELECTRIC ARC SYNTHESIS OF TUNGSTEN CARBIDE FROM ORE CONCENTRATES
The relevance of the study is related to the growing world consumption of tungsten carbide based materials and its possible application in many various fields: cutting tools manufacturing, powder, metallurgy catalysis, etc. In this case the search for new energy effective low-cost methods for tungst...
| Main Authors: | , , |
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| Format: | Article |
| Language: | Russian |
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Tomsk Polytechnic University
2021-05-01
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| Series: | Известия Томского политехнического университета: Инжиниринг георесурсов |
| Subjects: | |
| Online Access: | http://izvestiya.tpu.ru/archive/article/view/3200/2474 |
| Summary: | The relevance of the study is related to the growing world consumption of tungsten carbide based materials and its possible application in many various fields: cutting tools manufacturing, powder, metallurgy catalysis, etc. In this case the search for new energy effective low-cost methods for tungsten ores processing is a well-known important topic. The aim of the study is to carry out the research for finding out the operation parameters of vacuum-free arc plasma synthesis of tungsten carbides in atmospheric plasma using tungsten-containing ore concentrate as an initial material, which provide the spontaneous self-shielding effect of the reaction volume from atmospheric oxygen. Objects: synthesis of tungsten carbide in a DC arc discharge plasma from a tungsten-containing ore concentrate by a non-vacuum method. Methods: vacuum-free electric arc synthesis method, X-ray powder diffractometry on a Shimadzu XRD 7000s X-ray diffractometer (λ=1,54060 Å), scanning electron microscopy using a TESCAN VEGA 3 SBU microscope (TESCAN, Czech Republic) equipped with an attachment for energy dispersive analysis (EDS) ODS Max 50 with Si/Li crystal detector. Results. A series of experiments was carried out on the synthesis of tungsten carbides in a DC arc discharge from tungsten ore concentrate, as a result of X-ray diffraction data of several obtained samples, scanning electron microscopy and analysis, it was found that the phases of tungsten carbide WC and W2C can be identified in the products of electric arc processing of ore concentrate, while complete processing of the initial material is observed with the duration of electric arc processing not less than 30 s (with an arc energy of not less than 95 kJ). According to the obtained data with an increase in the synthesis time, the proportion of W2C decreases, while the proportion of tungsten carbide WC increases. |
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| ISSN: | 2500-1019 2413-1830 |