Preparation and Properties of Free-sintering Mullite-SiC Refractory

摘要

A series of free-sintering refractories which use SiC and mullite as raw materials had been studied in this paper.This kind of free-sintering refractory utilized aluminum dihydrogen phosphate as inorganic adhesive.This paper analyzed thermal shock resistance and mechanical properties of the free-sintering specimens with different additions of SiC raw material.Results showed that the linear change rate of specimens changed a little when sintered at the temperature of 1000 °C for 3 h.With the increase of SiC,the compressive strength of the specimens dropped and thermal shock resistance improved.The overall results suggested that when SiC addition was 30 wt.％,the apparent porosity of the specimens was 30％ in average,those specimens represented good mechanical properties and thermal-shock resistance.