678.644This paper considers the action of a vibrowave fi eld combined with a magnetic or electric fi eld on the heat conductivity of dispersion-fi lled adhesive interlayers. It has been established that under the action of combined physical fi elds the heat conductivity of the adhesive composite markedly increases. It has been shown that the effective heat conductivity of the adhesive interlayer can be regulated by varying the magnetic or electric fi eld intensity and the frequency of mechanical vibrations of the vibrowave fi eld, as well as the temperature, concentration, and dispersion of the fi ller.Keywords: heat conductivity coeffi cient, magnetic or electric fi elds, vibrowave action.
Introduction.In science-intensive fi elds of modern technologies such as aero-and astronautics and military systems, adhesive composites are used widely [1]. In a number of cases, stringent requirements of not only high strength but also high heat conductivity are placed upon the adhesive composites of metalworks [2]. One way to increase the heat conductivity of polymer materials, including polymer adhesives, is the use of highly concentrated metallic powder for their fi llers. However, this method does not permit attaining values of the effective heat conductivity of the adhesive composite higher than 0.6-0.7 W·m -1 ·K -1 , and there occurs a marked decrease in the strength of the composite [3]. Investigations [4,5] have shown that the action of a constant magnetic fi eld on a nonsolidifi ed adhesive composite with a powder fi ller of ferromagnetic nature or a constant electric fi eld on such a composite with a powder fi ller of nonferromagnetic nature leads to an increase in the heat conductivity coeffi cient of the above composites without affecting their strength characteristics. As special investigations have shown [6], in a number of cases, the strength of such adhesive composites even tends to increase.Under the action of the physical fi elds, in the adhesive interlayer structurization of fi ller particles takes place. These particles are oriented along the lines of force of the applied fi elds and form bridge structures connecting the surfaces of metal substrates, which leads to an increase in the heat conductivity of the interlayer. At the same time, as photographs of the microstructure of adhesive interlayers treated in magnetic and electric fi elds show, the fi ller particles do not always contact with one another, which naturally decreases the heat conductivity of the interlayer. From this it follows that there are reserves for increasing the heat conductivity of adhesive interlayers by increasing the packing density of fi ller particles in bridge formations. One of the methods for realizing such a reverse seems to be modifying dispersion-fi lled interlayers in the nonsolidifi ed state by combined physical fi elds.In the present work, we have investigated the infl uence of a magnetic or electric fi eld acting on the layer of the composite material jointly with a vibrowave fi eld on the heat conductivity of this lay...