Fabrication of porous filter material for the integrated gasification combined cycle

Abstract

The porous ceramic filter material is the most effective filter materials in the integrated gasification combined cycle. The porous silicon nitride due to its higher mechanical strength, as well as good corrosion resistance, is considered as a promising material in the integrated gasification combined cycle. In this paper, porous silicon nitride ceramics with high porosity and uniform pore structure was prepared by carbothermal reduction reaction between low-cost diatomite and carbon black. The influence of the type of sintering additives and the size of diatomite particles was investigated. Microstructures and mechanical properties of porous silicon nitride ceramics were studied by XRD, SEM and three-point bending measurement. XRD analysis showed that β-Si3N4 phase, α-Si3N4 phase, Sialon phase Si5AlON7 and glass phase Y2Si3O3N4 were detected. SEM analysis showed that porous silicon nitride ceramics was composed of rod-like (β-Si3N4 grains and uniform pores.