Synthesis of ultrafine (Mo,W)Si2 composite powders from high purity molybdenum concentrate
(Mo,W)Si2 composite powders with the grain size of about 1 μm were synthesized at 1150℃ for 2 h. The high purity molybdenum concentrate (with the main component of MoS2), W and Si powders were utilized as raw materials and lime as desulfurizer. The graphite felt was laid between the compact (made of...
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University of Belgrade, Technical Faculty, Bor
2023-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
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| Online Access: | https://doiserbia.nb.rs/img/doi/1450-5339/2023/1450-53392300041H.pdf |
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| author | Huang J.-B. Zhang G.-H. |
| author_facet | Huang J.-B. Zhang G.-H. |
| author_sort | Huang J.-B. |
| collection | DOAJ |
| description | (Mo,W)Si2 composite powders with the grain size of about 1 μm were synthesized at 1150℃ for 2 h. The high purity molybdenum concentrate (with the main component of MoS2), W and Si powders were utilized as raw materials and lime as desulfurizer. The graphite felt was laid between the compact (made of MoS2, W and Si) and the lime to facilitate the separation of the produced composite powders from desulfurization product. The phase composition, microstructure evolution, and residual sulfur content during the silicothermic reduction reaction were evaluated. The experimental results showed that the reaction could be completed after a reaction time of 1150℃ for 2 h, and the residual sulfur content of the product was 0.087 wt.%. It was concluded that the interactions between Si and the intermediate products of SiS and SiS2 are crucial for the preparationof (Mo,W)Si2 composite powders at low temperatures. The preparation process could be divided into three stages: solid state reactions between MoS2, W and Si to produce MoSi2, WSi2 and gaseous SiS; gas-solid reaction between MoS2, W and gaseous SiS to generate MoSi2, WSi2 and gaseous SiS2; and gas-solid reaction between gaseous SiS2 and Si to form SiS gas. With this short flow process, fine-grained (Mo,W)Si2 composite powders can be produced at low cost at low temperature, which has great application potential. |
| format | Article |
| id | doaj-art-ebe0ff58aae64221ba771124e50ed318 |
| institution | Kabale University |
| issn | 1450-5339 2217-7175 |
| language | English |
| publishDate | 2023-01-01 |
| publisher | University of Belgrade, Technical Faculty, Bor |
| record_format | Article |
| series | Journal of Mining and Metallurgy. Section B: Metallurgy |
| spelling | doaj-art-ebe0ff58aae64221ba771124e50ed3182025-02-02T05:24:29ZengUniversity of Belgrade, Technical Faculty, BorJournal of Mining and Metallurgy. Section B: Metallurgy1450-53392217-71752023-01-0159347748810.2298/JMMB230525041H1450-53392300041HSynthesis of ultrafine (Mo,W)Si2 composite powders from high purity molybdenum concentrateHuang J.-B.0Zhang G.-H.1State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, ChinaState Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, China(Mo,W)Si2 composite powders with the grain size of about 1 μm were synthesized at 1150℃ for 2 h. The high purity molybdenum concentrate (with the main component of MoS2), W and Si powders were utilized as raw materials and lime as desulfurizer. The graphite felt was laid between the compact (made of MoS2, W and Si) and the lime to facilitate the separation of the produced composite powders from desulfurization product. The phase composition, microstructure evolution, and residual sulfur content during the silicothermic reduction reaction were evaluated. The experimental results showed that the reaction could be completed after a reaction time of 1150℃ for 2 h, and the residual sulfur content of the product was 0.087 wt.%. It was concluded that the interactions between Si and the intermediate products of SiS and SiS2 are crucial for the preparationof (Mo,W)Si2 composite powders at low temperatures. The preparation process could be divided into three stages: solid state reactions between MoS2, W and Si to produce MoSi2, WSi2 and gaseous SiS; gas-solid reaction between MoS2, W and gaseous SiS to generate MoSi2, WSi2 and gaseous SiS2; and gas-solid reaction between gaseous SiS2 and Si to form SiS gas. With this short flow process, fine-grained (Mo,W)Si2 composite powders can be produced at low cost at low temperature, which has great application potential.https://doiserbia.nb.rs/img/doi/1450-5339/2023/1450-53392300041H.pdfmolybdenum disilicidetungsten disilicidecomposite powderssilicothermic reduction |
| spellingShingle | Huang J.-B. Zhang G.-H. Synthesis of ultrafine (Mo,W)Si2 composite powders from high purity molybdenum concentrate Journal of Mining and Metallurgy. Section B: Metallurgy molybdenum disilicide tungsten disilicide composite powders silicothermic reduction |
| title | Synthesis of ultrafine (Mo,W)Si2 composite powders from high purity molybdenum concentrate |
| title_full | Synthesis of ultrafine (Mo,W)Si2 composite powders from high purity molybdenum concentrate |
| title_fullStr | Synthesis of ultrafine (Mo,W)Si2 composite powders from high purity molybdenum concentrate |
| title_full_unstemmed | Synthesis of ultrafine (Mo,W)Si2 composite powders from high purity molybdenum concentrate |
| title_short | Synthesis of ultrafine (Mo,W)Si2 composite powders from high purity molybdenum concentrate |
| title_sort | synthesis of ultrafine mo w si2 composite powders from high purity molybdenum concentrate |
| topic | molybdenum disilicide tungsten disilicide composite powders silicothermic reduction |
| url | https://doiserbia.nb.rs/img/doi/1450-5339/2023/1450-53392300041H.pdf |
| work_keys_str_mv | AT huangjb synthesisofultrafinemowsi2compositepowdersfromhighpuritymolybdenumconcentrate AT zhanggh synthesisofultrafinemowsi2compositepowdersfromhighpuritymolybdenumconcentrate |