HEAT-RESISTANT ELECTRICAL INSULATING CERAMIC MATERIALS
Description of the project: Ceramic materials of the composition (2 – X) MgO × ChEO × 2Al2O3 × 5SiO2 0 <X <2, where E is Mn (II), Fe (II), Zn.
They can be used for thermal and electrical insulation of furnaces in foundries, thermal and forging shops.
Advantages: they have improved mechanical, thermal and electrophysical properties compared to cordierite. Depending on the composition of the reaction mixture and the firing temperature, in comparison with cordierite, they improve as follows: water absorption decreases by 40%, apparent density increases by 37–39%, open porosity decreases by 77–90%, and TLEC at 100 ° С decreases by 27 –30%, the specific volumetric electrical resistance at 100 ° С increases 30–35 times as compared to the unmodified composition 2MgO × 2Al2O3 × 5SiO2. The firing temperature, at which the maximum shrinkage of the test material occurs, is 100–200 ° C lower than the firing temperature of cordierite. For the production of materials, no additional equipment is required, since changes in the technology for the production of ceramic materials concern only the compositions.