Published 05/24/2022 at 1136 × 424 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.