Dielectric properties of plasma sprayed silicates subjected to additional annealing

0475260 - ÚFP 2018 RIV IR eng J - Journal Article
Ctibor, Pavel - Sedláček, J. - Nevrlá, Barbara - Neufuss, Karel
Dielectric properties of plasma sprayed silicates subjected to additional annealing.
Progress in Color, Colorants and Coatings. Roč. 10, č. 2 (2017), s. 105-114. ISSN 2008-2134. E-ISSN 2383-1790
Institutional support: RVO:61389021
Keywords : Annealing * Dielectric properties * Plasma spraying * Silicates * Electrical properties * Insulators
OECD category: Coating and films
http://pccc.icrc.ac.ir/Articles/1/18/990/

Several silicate materials were plasma sprayed and characterized by the authors. This work is concerned with selected dielectric properties of
these deposits. Synthetic mullite and steatite as well as natural olivine-forsterite were plasma sprayed using the water-stabilized plasma system (WSP). The deposits were striped-out, ground and polished to produce samples in form of plates with a smooth surface. Part of samples was later annealed in air. These samples were tested in the alternative low voltage electric field to measure capacity and loss factor. Volume resistivity was measured in a DC field. It is shown that the relative permittivity of as-sprayed silicates is less stable compared to bulk in the whole studied frequency range. However, thermal annealing modifies the structure much closer to the sintered bulk which is also reflected in dielectric properties. Insulating ability of plasma-sprayed silicates with and without annealing is discussed in consequence with chemical changes and phase changes induced by annealing

Permanent Link: http://hdl.handle.net/11104/0272728