Influence of Ca/Al ratio on physical and dielectric properties of Al2O3/CaO-B2O3-SiO2 glass-ceramics composite coatings prepared by high enthalpy atmospheric plasma spraying |
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| Affiliation: | 1. Postgraduate Program in Materials Engineering, Federal Institute of Maranhão – IFMA, 65030-001 São Luis, MA, Brazil;2. Center of Research, Technology, and Education in Vitreous Materials (CeRTEV), Department of Materials Engineering (DEMa), Postgraduate Program in Materials Science and Engineering (PPGCEM), Federal University of São Carlos (UFSCar), 13565-905 São Carlos, SP, Brazil;3. Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil;4. Instituto de Cerámica y Vidrio (CSIC), C/Kelsen 5, Campus de Cantoblanco, 28049 Madrid, Spain;5. Department of Physics – DEFIS, Federal Institute of Maranhão – IFMA, 65030-001 São Luís, MA, Brazil |
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| Abstract: | The dielectric layer plays a key role in regulating electromagnetic wave broadband scattering based on meta-surface technology. Herein, the physical properties of composite powder, prepared by spray drying of CaO-B2O3-SiO2 (CBS) glass-ceramic powder and Al2O3 in different mass ratios, are systematically investigated. Meanwhile, a high enthalpy atmospheric plasma spraying equipment is utilized to prepare CBS/Al2O3 composite coatings, and the morphology, physical properties and dielectric properties of the composite coating are analyzed. The XRD and DSC data of the composite coating reveal that the crystallization behavior of β-CaSiO3 and CaB2O4 gradually disappear with the increase of Al2O3 content. Hence, only CaAl2Si2O8 phase is observed during heat treatment. The experimental results confirm that the dielectric properties of CBS/Al2O3 composite coating conform to the rule of mixture for composite materials. Also, the dielectric properties are affected by porosity and crystallization rate. |
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| Keywords: | Thermally sprayed dielectric coating High-enthalpy atmospheric plasma spraying Dielectric properties Electromagnetic wave scattering |
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