INFRARED RADIATION OF SOLIDS REFRACTORY MATERIALS

Abstract : Appartus and techniques were developed for determining the infrared radiation characteristics of solids, including flame-sprayed ceramic coatings, at elevated temperatures. The theoretical basis for the equipment design and operation is discussed. The normal spectral emittance, integrated normal total emittance, and infrared radiation intensity curves of selected solids for different surface conditions were determined at a temperature of 1300 K in the wavelength region extending from 1.0 to 10.0 microns. Infrared radiation properties for the three flame sprayed ceramic coatings, aluminum oxide, chromic oxide, and zirconium oxide, and for one test specimen of solid boron nitride are discussed. It was found that flame-sprayed chromic oxide most closely simulated a blackbody in the wavelength region studied. (Author)