Enhancing the thermal stability of S/Se based thermoelectric materials using self-generated oxide films |
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| Affiliation: | 1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, PR China;2. School of Physics and Optoelectronic Engineering, Ludong University, Yantai, 264025, PR China;1. Department of Science and Humanities, Sri Krishna College of Engineering and Technology, Coimbatore, 641008, Tamilnadu, India;2. Department of Physics, KPR Institute of Engineering and Technology, Coimbatore, 641407, Tamilnadu, India;3. Physics Department, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, 61413, Saudi Arabia;1. School of Materials Science and Engineering, South China University of Technology, Guangzhou, China;2. National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou, China;3. Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education, South China University of Technology, Guangzhou, 510006, China;1. Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing, 100083, China;2. Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, CAGS, Zhengzhou, 450006, China;3. Shandong aofu Environmental Protection Technology Limited Company, Dezhou, 251599, China;1. Southern Federal University, Research Institute of Physics, Rostov-on-Don, Russia;2. Kh. Ibragimov Complex Institute of the Russian Academy of Sciences (CI RAS), Grozny, Russia;3. Southern Federal University, Faculty of Physics, Rostov-on-Don, Russia;4. Southern Federal University, Institute of Nanotechnologies, Electronics and Equipment Engineering, Taganrog, Russian Federation;5. Southern Federal University, Institute of High Technology and Piezo Technic, Rostov-on-Don, Russia;6. Chechen State University A.A. Kadyrov, Institute of Mathematics, Physics and Information Technology, Grozny, Russia;7. Chechen State University, Department of Applied Physics, Grozny, Russia |
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| Abstract: | This study focuses on the thermal stability of Cu1.8S materials. During the ball milling process, metal powder is added to the milled Cu1.8S powder, and then the obtained powder is sintered using current assisted sintering to obtain dense blocks. The aim is to enable the added metal elements to spontaneously grow an oxide film on the surface of the material block at high temperature, achieving protection of the material matrix. The thermal stability of materials is evaluated by utilizing changes in room temperature phase composition before and after high-temperature heat treatment, changes in material electrical conductivity during high-temperature processes, and cyclic electrical transmission performance testing. By observing the surface oxide film state of the material after high-temperature treatment, the commonalities and differences in the effects of different element additions on the thermal stability of the material were analyzed. The effects of different metal elements on material hardness and electrical transmission performance were evaluated. It is found that adding metal powder can effectively improve the thermal stability of Cu1.8S, improve material hardness, and regulate the electrical transmission performance of the material. The characteristics of the oxide film formed by the spontaneous growth of metal elements and oxygen on the surface of the material substrate determine the effectiveness of the oxide film in protecting the material from high temperatures. The pure Cu1.8S bulk can only maintain stability at 300 oC, and the addition of Cr, Al, 316L, Fe, and Mn powder respectively increased the stable temperature of the material to 400, 400, 450, 450, 500 oC. Adding metal elements to the material matrix to grow an oxide film on the surface of the material to prevent high-temperature oxidation or decomposition is an effective way to improve the thermal stability of S/Se compounds. |
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| Keywords: | Thermoelectric materials Copper sulfide Thermal stability Oxide film |
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