Preparation of lightweight corundum-mullite thermal insulation materials by microwave sintering

Lightweight corundum-mullite thermal insulation materials were successfully prepared by microwave sintering at low temperature. The effects of temperatures, PMMA microspheres and SiC particles on structure properties as-prepared investigated. became a hot spot under the action field, these local high temperature areas promoted formation growth mullite whiskers. burn out, leaving pores which could provide space for It was found that optimal 1400?C corresponding porosity, density bending strength samples 71.2%, 0.99 g/cm3 3.85MPa, respectively. conductivity from 0.201 to 0.313W/(m?K) between 30?C 950?C. This work demonstrated lightweight with density, good shock resistance excellent be sintering.