SOME MECHANICAL AND THERMAL PROPRERTIES OF MULLITE PREPARED FROM IRAQI STARTING MATERIALS

Some mechanical and thermal properties of mullite samples prepared by mixing different phases of alumina and si 1 tea powders have been studied according to ASTM methods.The cold crushing strength of the sintered bodies, with different porosity, at room temperature was in the range (18-54) Mpa. And the flexural strength was (3.8- 26.1) Mpa. The thermal properties of samples. Specific heat, of thermal insulation was (19028(j/g C), and the measured thermal expansion coefficient was between (7.08-7.68) x 10 ^-6 z C at (he temperature difference (20-100 C) . ( the thermal conductivity was measured and calculated for samples with different porosity and mullite content percentages.