Effects of Fibers and Opacifiers on Properties of Nanoporous Powder Insulation Material

Abstract

Abstract: Novel high temperature insulation material has a significant energy efficient effect on the industrial kiln, and it reduces the kiln high temperature radiation thermal conductivity facilitating high temperature insulation performance. In this work, the samples of fibers and opacifiers to add different types and different mass fraction were prepared using a dry method and the compressive strength and thermal conductivity of the samples were tested, and the microstructure and infrared transmittance of the samples were analyzed by SEM, EDS and FTIR. The results show that polycrystalline mullite fiber effectively improves the compressive strength of the insulation material and the thermal conductivity of the 9% (mass fraction) polycrystalline mullite fiber doped the nanoporous powder insulation material is 0.047 W/(m·K) at 800 ℃, which is lower than that of the insulation material added with quartz fiber. Nano-SiC powder and zircon powder effectively inhibit the radiant heat transfer and reduce the high-temperature radiant thermal conductivity as the opacifier. The thermal conductivity of the nanoporous powder insulation material with 10% (mass fraction) nano-SiC powder added is only 0.041 W/(m·K) at 800 ℃.

Key words: insulation material, nanoporous powder, reinforced fiber, opacifier, compressive strength, thermal conductivity

CLC Number:

TU55

DU Haoran, XING Yiqiang, LI Xiang, CHEN Kaiyang, WANG Shijie, MA Chengliang. Effects of Fibers and Opacifiers on Properties of Nanoporous Powder Insulation Material[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(10): 3257-3264.

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