Effect of alumina bubbles with and without Al2O3 coatings on the performance of lightweight Al2O3-MgAl2O4 refractories

摘要

abstract_textpIn this work, the effect of alumina bubbles with Al(2)O(3)coatings (CABs) and without coatings (ABs) on the performance of lightweight refractories was investigated. It showed that the addition of either ABs or CABs was beneficial to improve mechanical properties of refractories. The compressive strength for the specimens with 1 wt% ABs and CABs addition increased from similar to 50.5 to similar to 60.9 and similar to 70.2 MPa. The refractoriness under load was enhanced from similar to 1589 to similar to 1617 and similar to 1623 degrees C. Furthermore, the results of three-point bending tests showed significant improvement was achieved in thermal shock resistance in terms of the value of residual strength ratio from 16% to 43% for specimens with CABs addition. Meanwhile, the results of ultrasonic pulse velocity measurement indicated that there is a good consistency between two evaluation methods. In order to achieve the trade-off between lightweight and overall performance, the introduction of CABs into lightweight refractories is feasible and effective./p/abstract_text