Intensive grinding of powders in an electro-magneto-mechanical mill |
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| Affiliation: | 1. Silesian Technical University, ul. Krasińskiego 8, 40019 Katowice, Poland;3. University of Mining and Metallurgy, al. Mickiewicza 3030-059 Cracow, Poland;1. Institut für Tropenmedizin, Universitätsklinikum Tübingen, Tübingen, Germany;2. Centre de Recherches Médicales de Lambaréné, Lambaréné, Gabon;3. German Centre for Infection Research, Heinrich Pette Institute, Hamburg, Germany;4. Centre Muraz–IRSS, Bobo-Dioulasso, Burkina Faso;5. Centre de Recherche Entomologique de Cotonou, Cotonou, Benin;6. Centre de Recherche en Santé de Nouna, Nouna, Burkina Faso;7. Groupe de Recherche Action en Santé, Ouagadougou, Burkina Faso;8. Centre National de Recherche et de Formation sur le Paludisme, Ouagadougou, Burkina Faso;9. Kenya Medical Research Institute, US Army Medical Research Unit, Nairobi, Kenya;10. KEMRI-Wellcome Trust Research Programme, Kilifi, Kenya;11. Département de Parasitologie, Mycologie, Médecine Tropicale, Université des Sciences de la Santé, Libreville, Gabon;12. Sanofi Research and Development, Chilly-MAzarin, France;13. Walter Reed Project, Kenya Medical Research Institute, Kisumu, Kenya;1. Ministry of Education (MOE) Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China;2. College of Pharmaceutical Sciences, Zhejiang University, 866 Yu-Hang-Tang Road, Hangzhou 310058, China;3. Collaborative Innovation Center for Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, China;1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;2. Achteck Tool Technology Co. Ltd., Ganzhou 341000, China;3. Layyous Consulting Ltd., Miilya 25140, Israel;1. School of Materials Science and Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103, India;2. Department of Metallurgy and Materials Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103, India;3. Materials Science and Technology Division, CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India |
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| Abstract: | The paper presents the results of high-energy grinding in the electro-magneto-mechanical (EMM) mill. Ground powder is treated in a very specific and intensive way owing to several field forces operating simultaneously in the EMM mill. The grinding power in the centre of the mill's working chamber is in the order of 2 MW/m3, which is much more than in ordinary mills. Therefore, the grinding time is very short, i.e., several tens of seconds. The self-disintegrated Fe–Al–Si powders of 155 μm on average undergo size reduction to 8 μm after 120 s. Over 25% of the total weight get the size of less than 1.3 μm. Very hard materials, such as SiC and B4C reduce their grain size over 30 times after 120 s of grinding in the EMM mill. The results of the grinding of Fe2O3 powder are even better. In ball mills, vibration and planetary mills, similar results can be achieved after a period several hundreds times longer. The treatment of Fe–Al–Si powder presented here is intended as the preparation procedure for sintering, plasma spraying or laser surface alloying. |
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