Thin Solid Films, 45 (1977) 211-234 Elsevier Sequoia S.A., Lausanne-Printed in the Netherlands 211 THE NECESSITY FOR COATINGS IN FOSSIL ENERGY CONVERSION SYSTEMS H. E. FRANKEL AND S. J. DAPKUNAS U.S. Energy Research and Development Administration, Division of Materials and Exploratory Research, Washington, D.C. 20545 (U.S.A.) (Received March 31, 1977; accepted April 8,