Directional Spectral Emissivity Measurements on a Ceramic Mold Material.

摘要

This document describes directional spectral emittance measurements made on a ceramic mold material that is to be used to cast high- temperature turbine rotors. The work was performed at /approximately/700 K and 5 /times/ 10/sup /minus/9/Torr in an emissivity measurement apparatus. The results, which show how low scatter and conform to expectations derived from both theoretical relations and published ceramic data, give a total hemispherical emissivity of 0.42 /+-/ 0.04 when integrated over wavelength and direction at 1000 K. 3 refs., 11 figs. (ERA citation 13:049066)