THE EFFECTS OFB2O3 CONTENT ON PROPERTIES OFALUMINA-MAGNESIADRY RAMMING MATERIALS

摘要

This paper explored the effect of B2O3 content on the properties of alumina-magnesia dry ramming materials through analysis of its phases, morphology of the samples fired at a high temperature with different amounts of B2O3. Different sizes of corundum, α-Al_2O_3 powder and fused magnesia were used as raw materials, boron oxide as binding agent and a hand-ramming molding method to keep its shape. The test results of the samples fired at 1600 °C for 3h showed that the most appropriate amount of B2O3 addition was 1.5wt%, at this condition, the Al_2O_3 and MgO reacted with each other to generate a great amount of aluminum-magnesium spinel with the size ranging from 3μm to 15μm. Some of the alumina-magnesia spinel were closely combined together by reason of sintering and crystallization, and the ones of small size showed a more regular shape.