A. V. Aganyan, A. N. Avagyan, A. K. Kostanyan, L. A. Petrosyan, S. G. Manukyan, V. S. Harutyunyan
{"title":"α-WC粉末的电火花合成及其退火相变研究","authors":"A. V. Aganyan, A. N. Avagyan, A. K. Kostanyan, L. A. Petrosyan, S. G. Manukyan, V. S. Harutyunyan","doi":"10.1134/S1068337222040028","DOIUrl":null,"url":null,"abstract":"<p>We propose in this paper a method for the synthesis of α-WC powder by the method of electric spark discharge, where WC–8% Co (anode) and W (cathode) are used as electrode materials, and deionized water is used as a dielectric liquid. The synthesized powder was subjected to thermal annealing after drying in an air atmosphere at temperatures of 250, 400, and 600°C for 2 h in order to analyze its thermal stability and identify possible temperature-dependent phase transitions. The phase composition, morphology, and particle sizes of the synthesized powder and powders subjected to thermal annealing were studied by powder X-ray diffraction and scanning electron microscopy. The synthesized powder contained two phases: the dominant α-WC phase and the α-W<sub>2</sub>C phase. Both α-WC and α-W<sub>2</sub>C phases almost completely transformed into the CoWO<sub>4</sub> phase at an annealing temperature of 600°C. The processes of formation of the phase components of the synthesized powder and the transition of these components to the CoWO<sub>4</sub> phase as a result of thermal annealing are discussed.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":null,"pages":null},"PeriodicalIF":0.5000,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"Electro Spark Synthesis of α-WC Powder and Study of Its Phase Transformations upon Annealing\",\"authors\":\"A. V. Aganyan, A. N. Avagyan, A. K. Kostanyan, L. A. Petrosyan, S. G. Manukyan, V. S. Harutyunyan\",\"doi\":\"10.1134/S1068337222040028\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>We propose in this paper a method for the synthesis of α-WC powder by the method of electric spark discharge, where WC–8% Co (anode) and W (cathode) are used as electrode materials, and deionized water is used as a dielectric liquid. The synthesized powder was subjected to thermal annealing after drying in an air atmosphere at temperatures of 250, 400, and 600°C for 2 h in order to analyze its thermal stability and identify possible temperature-dependent phase transitions. The phase composition, morphology, and particle sizes of the synthesized powder and powders subjected to thermal annealing were studied by powder X-ray diffraction and scanning electron microscopy. The synthesized powder contained two phases: the dominant α-WC phase and the α-W<sub>2</sub>C phase. Both α-WC and α-W<sub>2</sub>C phases almost completely transformed into the CoWO<sub>4</sub> phase at an annealing temperature of 600°C. The processes of formation of the phase components of the synthesized powder and the transition of these components to the CoWO<sub>4</sub> phase as a result of thermal annealing are discussed.</p>\",\"PeriodicalId\":623,\"journal\":{\"name\":\"Journal of Contemporary Physics (Armenian Academy of Sciences)\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.5000,\"publicationDate\":\"2022-12-26\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Contemporary Physics (Armenian Academy of Sciences)\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://link.springer.com/article/10.1134/S1068337222040028\",\"RegionNum\":4,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"PHYSICS, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Contemporary Physics (Armenian Academy of Sciences)","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1134/S1068337222040028","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
Electro Spark Synthesis of α-WC Powder and Study of Its Phase Transformations upon Annealing
We propose in this paper a method for the synthesis of α-WC powder by the method of electric spark discharge, where WC–8% Co (anode) and W (cathode) are used as electrode materials, and deionized water is used as a dielectric liquid. The synthesized powder was subjected to thermal annealing after drying in an air atmosphere at temperatures of 250, 400, and 600°C for 2 h in order to analyze its thermal stability and identify possible temperature-dependent phase transitions. The phase composition, morphology, and particle sizes of the synthesized powder and powders subjected to thermal annealing were studied by powder X-ray diffraction and scanning electron microscopy. The synthesized powder contained two phases: the dominant α-WC phase and the α-W2C phase. Both α-WC and α-W2C phases almost completely transformed into the CoWO4 phase at an annealing temperature of 600°C. The processes of formation of the phase components of the synthesized powder and the transition of these components to the CoWO4 phase as a result of thermal annealing are discussed.
期刊介绍:
Journal of Contemporary Physics (Armenian Academy of Sciences) is a journal that covers all fields of modern physics. It publishes significant contributions in such areas of theoretical and applied science as interaction of elementary particles at superhigh energies, elementary particle physics, charged particle interactions with matter, physics of semiconductors and semiconductor devices, physics of condensed matter, radiophysics and radioelectronics, optics and quantum electronics, quantum size effects, nanophysics, sensorics, and superconductivity.