THERMAL DIFFUSIVITY MEASUREMENTS ON METALS AND CERAMICS AT HIGH TEMPERATURES.
Report for 27 Feb-19 Dec 62,
NORTHWESTERN UNIV EVANSTON ILL TECHNOLOGICAL INST
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The U. S. Naval Radiological Defense Laboratory flash method of measuring thermal diffusivity has been extended to ceramics at high temperatures. Several problems encountered in applying this technique to ceramics are discussed namely, heating the samples to a uniform temperature over the sample face overcoming the transparency of the specimens to the radiation from the xenon flash lamp and correcting for radiation heat losses from low thermal conductivity ceramic specimens at higher temperatures. Measurements of the thermal diffusivity of the following mate rials are reported up to the temperatures indi cated Pyroceram No. 9606 1160 C, Pyroceram No. 9608 1210 C, Pyroceram No. 9690 1150 C, beryllium oxide 1780 C, aluminum oxide four types 1730 C, magnesium oxide two types 1370 C and two spinels 1630 C. Heat capacity data have been obtained on Pyroceram No. 9608 be tween room temperature and 650 C. Author