Abstract: In this paper, insulation tiles were prepared by dispersion stirring, wet suction filtration, and high temperature sintering, with quartz fiber, silica sol and BN powder as the main components. The effects of BN powder content and sintering temperature on the micro morphology, mechanical properties and thermal properties of insulation tiles were studied. In particular, the influence of high temperature environment on the thermal conductivity of the insulation tile and the hot and humid environment on the dielectric performance of the insulation tile are studied. The research results show that the fibers are effectively connected through the action of silica sol and the sintering aid BN. Changing the BN content and sintering temperature can adjust the material properties and obtain the optimal preparation process. Insulation tiles have extremely low thermal conductivity, but they will undergo changes such as sintering shrinkage under high temperature environments, which will significantly improve thermal performance parameters such as thermal conductivity. The hot and humid environment has a significant impact on the dielectric performance of the insulation tile, and the dielectric loss greatly increases. The moisture-proof treatment can reduce the water absorption rate of the insulation tile, so that its dielectric performance is stable.

Key words: insulation tile, micro morphology, dielectric properties, thermal conductivity, high temperature environment, hot and humid environment, composites