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Funct. Mater. 2018; 25 (4): 823-828.

doi:https://doi.org/10.15407/fm25.04.823

Physicochemical regularities of a high-voltage electroporcelain formation with a sintering temperature of 1200°C

K.B.Bohdanova

National Technical University Kharkiv Polytechnic Institute, 2 Kirpicheva Str., 61002 Kharkiv, Ukraine

Abstract: 

The composition and technological parameters of manufacturing low-temperature electroporcelain with complex of high electrophysical and mechanical properties have been developed. With the use of differential thermal, X-ray phase, IR spectroscopic and electron microscopic methods of analysis, physicochemical regularities in the formation of electrical porcelain at 1200°C have been established. It is shown that high dielectric and mechanical characteristics of low-temperature porcelain (ρV = 4.1·1014 Ohm·cm; E = (29-30) kV·mm-1; tgδ·103 = 12.11; σr = 31 MPa) are provided by activating the sintering with the participation of a modified feldspar melt and intensive formation of the mullite phase in the form of microfibers with a predominant size of ~ 0.007-8 &mu>m with the addition of complex mineralizer additives (12 wt.% pyrophyllite and 0.3 wt.% titanium dioxide).

Keywords: 
low-temperature electrical porcelain, dielectric strength, electrical resistance, mineralizer, phase formation, mullite.
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