Design of grain composition of conductive cluster of multicomponent composite and mechanism for monitoring morphology of its microstructure

DOI: 10.62564/M4-VP2113

Vitaly Petrovsky, Semenyuk Natalia

Frantsevich Institute for Problems of Materials Science National Academy of Science of Ukraine


The electric field strength, and the current density which that promotes the heating of the material, both are also a nonlinear function of the grain composition of the conductive cluster. If the square of current density through the sample is a structure-sensitive parameter for a fine-grained structure, the square of electric field strength shows greater sensitivity in the case of predominance of the coarse microstructure. An empirical formula is proposed that relates the concentration of the coarse fraction in percent with the electric current density (in A/mm2), or the electric field strength (in V/cm), at which the surface temperature of 800K is reached (the beginning of the visible dark red glow of incandescent bodies). It was established that the critical change in the concentration of the coarse fraction, at which the specified color temperature is observed, is 30% Thus, the empirical relations can be applied to calculate the content of the coarse fraction in the microstructure morphology of the conducting cluster on the basis of direct measurements of the electric current density through the resistive material or resistive region.

Keywords
Ceramic, composites, conductive cluster, DC curent

Acknowledgments
Not provided

References
[1] Powder metallurgy, 2012, No 5-6, s.73-83 [2] Powder metallurgy, 2010, No 5-6, s.67-81