Published 05/27/2021 at 926 × 351 in Strength of Salt Core Composed of Alkali Carbonate and Alkali Chloride Mixtures Made by Casting Technique* Fig. 9 The scanning electron microscope (SEM) images of broken surface. (a) : NaCl–10 mol%Na2CO3. (b) : NaCl–70 mol%Na2CO3. Fig. 9 The scanning electron microscope (SEM) images of broken surface. (a) : NaCl–10 mol%Na2CO3. (b) : NaCl–70 mol%Na2CO3.