Mining tailings as a raw material for glass-bonded thermally sprayed ceramic coatings: Microstructure and properties |
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| Affiliation: | 1. VTT Technical Research Centre of Finland Ltd, Visiokatu 4, P.O. Box 1300, 33101 Tampere, Finland;2. Tampere Microscopy Center, Tampere University, Korkeakoulunkatu 3, 33014 Tampere University, Finland;3. Thermal Spray Center Finland (TSCF), Tampere University, Faculty of Engineering and Natural Sciences, P.O. Box 589, 33014 Tampere, Finland;4. Geological Survey of Finland, P.O. Box 1237, 70211 Kuopio, Finland;1. School of Physics, Nankai University, Tianjin, 300071, PR China;2. School of Mechanical Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, PR China;3. School of Microelectronics, Tianjin University, Tianjin, 300072, PR China;4. Research Institute of Meticulous Style Painting in Heavy Colors, Tianjin University, Tianjin, 300072, PR China;1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China;2. Department of Materials Science and Engineering, University of Sheffield, Sheffield S1 3JD, United Kingdom;3. School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China;1. Key Laboratory of Road Construction Technology and Equipment, MOE, Chang’an University, Xi’an, 710064, China;2. Key Laboratory of Pressure Systems and Safety, Ministry of Education, East China University of Science and Technology, Shanghai, 200237, China;1. Group of Advanced Functional Materials (MAFA), Department of Physics, Federal University of São Carlos (UFSCar), São Carlos, SP 13565-905, Brazil;2. Materials Science and Engineering Program, Department of Mechanical Engineering, University of Colorado at Boulder (UCB), Boulder, Colorado 80309-0427, USA;3. Group of Functional Nanomaterials, Department of Physics, Federal University of Sergipe, São Cristóvão, SE 49100-000, Brazil;4. São Carlos Institute of Physics, University of São Paulo (USP), P.O. Box: 369, CEP: 13560-970 São Carlos, SP, Brazil |
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| Abstract: | Magnesium aluminate, MgAl2O4, spinel powders for thermal spraying, were synthesized from secondary raw materials by spray drying and subsequent reaction sintering. Talc ore mining tailings and aluminium hydroxide precipitate from aluminium anodizing process were studied. A stoichiometric MgAl2O4 spinel coating was prepared as a reference using pure raw materials. Atmospheric plasma spraying resulted in the formation of ceramic coatings. Microstructural investigations revealed that the reference coatings exhibited crystalline lamellar microstructure of MgAl2O4 but secondary coatings contained amorphous areas between the crystalline MgAl2O4 clusters. Abrasive wear test results revealed considerably lower wear rate for secondary coatings. It is suggested that the different structure of coatings, particularly the high degree of amorphous phase between the isolated crystalline MgAl2O4 clusters caused the higher abrasive wear resistance by changing the wear mechanism. The dielectric breakdown strength of the secondary coatings were at the same level, 24 V/μm, as compared to reference coating, 23 V/μm. |
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| Keywords: | Mining tailings Circular economy Thermal spray Ceramic coating |
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