IMPROVED ADDITIVE COMPOSITION USEFUL FOR THE PREPARATION OF ALUMINA BASED ABRASION RESISTANT MATERIAL HAVING IMPROVED WEAR PROPERTIES, AND METHODS FOR THEIR PREPARATION

摘要

A process for the production of alumina based abrasion resistant liner materials , having improved mechanical properties . A special inexpensive additive composition is used to reduce the sintering circle time to minimize the powder consumption. The average part to be base of the initial principal raw material. Al2O3 is in the range of 4-5µm. The liner materials sintering temperature can be reduced to relatively low temperature ( 1480 to 1500oC. The process involves wet milling of 90-92% by weight of alpha alumina with an admixture of sintering agent substantially containing SiO2, MgO, BaO, CaO, B2O3. The milked powder was subjected to drying followed by gr pressing the granules in the form of tiles and then substantially liquid phase sintering of the pressed tiles. The sintered tiles showed very good mechanical and wear properties.