REACTION BETWEEN CALCIUM-DOPED LANTHANUM CHROMITE AND SILICA

Calcium-doped lanthanum chromite reacted with silica to form silicates and chromium oxide at 1473-1773 K, A reaction mechanism was proposed at each temperature, At 1473 K, a reaction zone was observed in two areas: one was the bulk reaction area where silicates and chromium oxide were formed near the reaction interface; the other was the grain boundary reaction area where chromium oxide and calcium silicate spots were formed far from the reaction interface, Above 1673 K, silicates in the La2O-CaO-SiO2 system and chromium oxide were formed simultaneously in the reaction zone with no grain boundary reaction, No layered reaction products were observed in the reaction zone of the lanthanum chromite side, Formation of melt silicates above 1723 K at the reaction interface resulted in strong bonding between calcium-doped lanthanum chromite and silica.