Abstract

A study was made of the room- and high-temperature thermal conductivities of some composite materials. It is demonstrated that the temperature dependence of the thermal conductivity of a composite is not determined by a simple summation of the thermal conductivities of its components, being affected also by any reactions occurring between the components during sintering and leading to the formation of new phases or solid solutions. The composition dependence of the room- or high-temperature thermal conductivity of a composite system obeys the law of additivity in the absence of reaction between the components of the system, but deviates appreciably from it when the components do react with each other.

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