1966-02-01

Kryptonates: A New Technique for the Study of Wear Parameters 660083

The use of the kryptonate technique for the study of surface temperatures, chemical reaction rates, and erosion is discussed as it pertains to wear. Kryptonates are solids into which radioactive Kr85 has been introduced into the surface layers to a depth of approximately 10-100 millimicrons. Following stabilization at an elevated temperature, the kryptonated solids retain their Kr85 content indefinitely unless subjected to external stresses. Such stresses include temperature in excess of the stabilization temperature, chemical reaction at the surface, and mechanical removal of surface layers.
Maximum surface temperatures and temperature distributions have been measured by exposing unstabilized samples to unknown environments, and reheating them in a controlled chamber. That temperature at which Kr85 release first commences determines the unknown surface temperature. Since the loss of Kr85 from a sample depends upon the magnitude and duration of the stress, the technique permits measurement of rates of oxidation, or other chemical reaction, and of mechanical erosion to be measured with extreme sensitivity by determination of the rate of loss of Kr85 activity from the sample.

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