Influence of conditions of heat treatment on the structure and properties of the coatings from colloidal-graphite dispersions

Аuthors

Prokof'ev M. V.^1*, Smolnikova O. N.^1**, Bibikov S. В.^2***, Kuznetsov A. M.³

1. Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia
2. Institute of Biochemical Physics, Russian Academy of Sciences, 4, Kosygina str., Moscow, 119334, Russia
3. R&PE «EnergoStroyKontakt+»,

*e-mail: mikepro1953@rambler.ru
**e-mail: aprilbreeze@rambler.ru
***e-mail: sbb.12@yandex.ru

Abstract

X-ray researches of chemically activated graphites used for reception of steady kolloidno-graphite dispersions are executed. They have been determined the X-ray characteristics of the original graphite pastes and conductive coatings obtained by precipitation from aqueous and alcoholic colloidal dispersions of graphite particles on various dielectric substrates. The influence of heat treatment on the structure and electrical conductivity of such coatings has been studied. The presence of amorphous phase component oj graphite material is revealed by the methods of X-ray diffraction analysis and is discovered the considerable reduction of its content in the process of powder activation of graphite, connected with the partial burning out of amorphous component and the structural packing of material. It has been established that the heat treatment of graphite coatings at temperatures of 1000—400 degrees leads to an increase in their specific conductivity as a result of the removal of thermally unstable groups on the area of the particle oj graphite and packing of carbonic film.

Keywords:

chemically activated graphites (CAG), colloidal graphite dispersions, electroconductive coatings, electrical resistivity, X-ray structural characteristics, heat treatment