Sintering Characteristics and Thermal Properties of Porous Ceramic Based on Hydrophlogopite and Refractory Clays

The results of investigations on the development of compositions of ceramic bodies for obtaining effective heat-insulating materials and products are presented. The materials were obtained by pressing with the use of kaolin clays differing in plasticity as well as fire-resistance. A porous structure of the material was created by introducing a porous filler in the form of swollen hydromica, developed according to the ferruginous hydrophlogopite type, in an amount of 50 wt.%. The apparent density and the mechanical strength were investigated as functions of the press-pressure and shrinkage on firing. The use of expanded hydromica made it possible to obtain products with density up to 1000 kg/m³ while thermomechanical properties retention up to 1050°C.