Research of mechanical and electric characteristics of new resistive materials
Journal Title: Науковий вісник полтавського університету економіки і торгівлі. Серія Технічні науки - Year 2015, Vol 1, Issue 73
Abstract
Results of pilot studies of mechanical and electric characteristics of new resistive composite materials are presented in article. Production of heating elements from composite materials is very effectively and high reliability. The great interest is caused by resistive composite materials which are fibroelektrobetons (fibrous-electric concretes) developed on the basis of a concrete matrix and reinforced by chemical electroconductive fibers. Resistive compositions have a number of shortcomings. Therefore, with participation of the author the resistive composite material (fibroelektrobeton) was developed that included the binder on the basis of quick-hardening cement, colloidal graphite, thermally stable filler in the form of quartz sand and stone screening dust, a fiber filler - chemical electroconductive fibers and technical carbon.Material has passed technical tests. Thus it is proved that the combination of a fiber leading phase with ultradispersed technical carbon and colloidal graphite facilitates creation of the oriented chained structures and conducts to their growth that is confirmed by decrease in specific electric resistance of composition.The fiber leading phase, reinforcing a matrix due to mechanical communication with a cement stone, significantly increases durability on stretching in case of a bend and resistance to formation of cracks. The greatest effect of fiber influence armature on durability in case of a bend is observed when entering it in composition in number of 2–4 % of the cement mass. It prevents development of destructive processes which arise when heating and chilling of composition. Length of fibers 4...6 mm promote their more uniform distribution in composition. Colloidal graphite is less subject to oxidation reducing change of electric composition resistance in case of its heating. Quickhardening cement provides stability of electric characteristics, allows to support almost invariable physicomechanical characteristics of composition to 150 °С. Granotsev is cheap and rather heatresistant material with high heat conductivity. Introduction in composition intensifies it heat removal from the local centers of heating and promotes averaging of temperature on all amount of material, interferes with passing of destructive processes and reduces internal tension in composition. Results of testing confirm that composite material possesses rather stable values of conductivity in the conditions of the increased temperatures, the high module of longitudinal elasticity, high durability on stretching in case of a bend and on compression. It can be used in various industries of power industry and construction: in case of production of volume composite resistors, low-temperature heating elements of household, industrial and agricultural purpose with a heating temperature (50...150) °С, the grounding and shielding devices, antistatic a floor, sidewalks and pavings warmed up, etc. By results of researches patent has been received.
Authors and Affiliations
Olga Volodko
Keywords
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