G. M. Kushnirskii

The relationship between the thermoplastic and the dielectric properties of oxide refractories

ConclusionsThe interrelationship between the deformation rate and the dielectric properties of Al2O3- and MgO-base refractory materials was investigated. An empirical relationship making it possible to compare the deformation rate of different refractory materials with their dielectric characteristics was obtained.

Creep in periclase and magnesia-spinel refractories

ConclusionsWe determined the creep at high temperatures and under compressive loads of fused periclase, periclase, and magnesia-spinel articles based on fused and sintered materials.For specimens of fused periclase with a dense, coarsely crystalline structure and low concentrations of silicate phases, there is typical a low level of creep; the decisive mechanism of deformation in such materials is, apparently, diffusion-viscous flow and slippage across the grain boundaries.In granular periclase and magnesia-spinel refractories with a porous structure and a comparatively high content of silicates, the deformation rate is significant, and the decisive mechanism of deformation for these materials is probably viscous flow of intercrystallite substance.

Relationship of the structure of slide valve periclase plates to their metal resistance

ConclusionsThe interaction of the original structure of periclase refractories, which is dependent upon their purity and structure, with the high temperature strength and metal resistance, was established. It was shown that samples of high purity fused periclase, in the structure of which coarse grains of fragmental structure predominate, had the highest resistance to the action of molten iron.

Thermoplastic properties of corundum refractories

ConclusionsThe authors have measured the creep of certain corundum refractory materials. They have shown that it is determined by the silica content, the annealing temperature of the artifacts, and the microstructure of the latter.

THERMOPLASTIC AND THERMOPHYSICAL PROPERTIES OF MAGNESIA--SPINEL REFRACTORIES FOR STEEL VACUUMING INSTALLATIONS

ConclusionsThe authors have obtained the dependences of the thermoplastic and thermophysical properties of magnesia-spinel refractories for SVI on the tensile loads and the vacuum.The best thermomechanical properties are exhibited by MKhVP refractories, obtained on the basis of fused periclase-chromite material.At an air pressure of less than 6 mm in the refractory pores, the thermal conductivity and thermal diffusivity of magnesia-spinel artifacts increase with temperature.