Abstract
The present work focused on the effect of Nb2O5 additive on the sintering behavior and properties of CA6, aiming to optimize the crystal structure of CA6 and achieve the improvement in densification and properties. The results indicated that the formation of cation vacancies caused by the substitution of Al3+ with Nb5+ greatly promoted the CA6 grain to grow along the direction perpendicular to basal plane (c-axes), resulting in an improvement in the sintering densification. A significant increase in the cold compressive strength was observed due to the Nb2O5 additives, especially for the samples whose porosity decreased with Nb2O5 addition. Low porosity and the formation of the Ca(NbO3)2 phase were responsible for improving the slag resistance of the samples with Nb2O5 additives. Therefore, the introduction of Nb2O5 is expected to prepare CA6 materials with improved sintering densification, mechanical properties and slag resistance, promoting its better application in the metallurgical field.
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