Abstract
The Riga Polytechnic Institute has developed a dense aluminous ceramic [i]. To determine the maximum working temperature we used the ultrasonic method of investigating its thermalshock resistance. The method is based on the change in the rate of dissemination of ultrasonic (US) waves in the specimens after the heating--cooling cycies at different temperatures. The magnitude of the resistance to thermal shock was characterized by the temperature at which there is a reduction in the rate of ultrasonic dissemination.
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