Investigations regarding the development of high alumina self-flowing bodies based on sintered bauxite and fused corundum grains

Unshaped refractory materials with self-flowing processing properties are o f increasing interest for linings in high temperature plants. High alumina refractory products are suitable for different lining requirements. The dev elopment of a self-flowing body with a grain structure made of sintered dol omite or fused corundum will be described here. After optimisation of the grain structure aimed at dense packing, other opt imisation steps have to be carried out in the direction of self-flowing cha racteristic behaviour with the least possible use of deflocculants. The dif ferent properties of two optimum mixtures based on sintered bauxite or fuse d corundum were determined by tests carried out when dry or when pre-fired at 1000 degreesC or 1500 degreesC. The measured microstructural characteristic values, strength and thermal pr oper-Lies such as hot bending strength, creep under load and thermal shock resistance can be recognised and this shows that there are products availab le which are at least equivalent to comparable moulded and unshaped refract ory materials.