CERTAIN PROBLEMS OF THERMAL STABILITY
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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The mechanism of the phenomena which arise in a solid as a result of cyclic heat treatment with rapid changes in temperature was studied. The conductivity of graphite with and without impregnated bakelite was measured to evaluate the thermal stability of the materials during heat treatment. It was confirmed experimentally that during cyclic heat treatment, the internal stresses associated with temperature variations caused a decrease in the contact surface. Compressive stresses associated with minute cavities in solids containing dispersed particles decreased electrical resistance and increased the contact surface. The thermal stability of a solid is determined by the properties, size, and shape of the material. Surface films can increase the thermal stability of a solid.