Thermal Diffusivity by Electron Bombardment Heating

Abstract

A method is developed for determining the thermal diffusivity of materials by heating with an electron beam. A solution of the heat transfer equation is obtained for the case of a finitely thick, infinitely wide slab, and the expression for the temperature‐wave phase shift is given. Using an experimental measurement of the temperature‐wave phase shift, values of diffusivity in Al₂O₃ and carbon were determined. The accuracy of the method should be within ±10%.