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Radiofrequency and Microwave Dielectric Properties of Plasma Sprayed and Annealed Thick Layers of Titanium Dioxide
Journal of Thermal Spray Technology ( IF 3.1 ) Pub Date : 2020-07-01 , DOI: 10.1007/s11666-020-01065-y
Pavel Ctibor , Josef Sedláček , Václav Papež , František Lukáč

Titanium dioxide (TiO2) was plasma sprayed using a high feed-rate spray system with hybrid water–argon stabilization torch (WSP-H). TiO2 powder agglomerated from nanometric particles was used as the feedstock. The produced coating had thickness over 4 mm, to be comparable with bulk ceramic bodies. The deposit was removed from the substrate and annealed in air to reoxidize the oxygen deficient as-sprayed titania and to obtain material with a proper dielectric behavior. Besides the microstructure studies, radiofrequency dielectric spectroscopy and microwave dielectric spectroscopy were in the focus of investigation. The approach to annealing of an extremely thick coating is studied: The significance of annealing of a large-area thick coating is discussed, as the role of grain interior and grain boundaries in the charge transport is influenced. Relative permittivity εr 94 and the Q*f product 12,800 GHz were reached at frequency 4 GHz, whereas the frequency response under 1 MHz was mapped continuously and the values (i.e., low and stable loss tangent) confirmed that a sprayed and air-annealed TiO2 is able to approach or also overperform dielectric parameters typical for TiO2 sintered bulk.

中文翻译:

二氧化钛等离子喷涂和退火厚层的射频和微波介电性能

二氧化钛 (TiO2) 使用带有混合水-氩稳定炬 (WSP-H) 的高进料速率喷涂系统进行等离子喷涂。由纳米颗粒团聚的 TiO2 粉末用作原料。生产的涂层厚度超过 4 毫米,可与块状陶瓷体相媲美。将沉积物从基材上移除并在空气中退火以重新氧化缺氧的喷涂二氧化钛并获得具有适当介电行为的材料。除了微观结构研究外,射频介电光谱和微波介电光谱也是研究的重点。研究了极厚涂层的退火方法:讨论了大面积厚涂层退火的重要性,因为晶粒内部和晶界在电荷传输中的作用受到影响。
更新日期:2020-07-01
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