Thermomechanical properties of refractory materials of AL2O3–Si3N4–C compositions based on acpb after impregnation with a sol-gel composition

Abstract

Comparative characteristics are presented for the physicomechanical properties and oxidation resistance of refractory materials of Al 2 O 3 -Si 3 N 4 -C composition based on an ACPB for the original materials (fired at 1400°C) and after impregnation with a sol-gel composition and heat treatment at 800°C. A reduction in material porosity, increase in strength and reduction in carbon burn-off are due to development of a glassy phase in the pore space and on graphite flakes due to SiO 2 formation with thermal destruction of the organosilicon substance.

Optimization of corrosion resistance and mechanical properties of Al2O3‐Cr2O3 refractories for waste incinerator

“…Previous researches showed that the suspensions or colloidal solutions impregnation treatment is one of the effective methods to improve microstructure, mechanical properties and thermal insulation performance of refractories. [23][24][25][26][27] Works by Jin et al showed that the impregnated Si 2 N 2 O porous ceramics with silica sol improved the mechanical properties of refractories due to the reduced surface pores and the increased crack propagation paths. 28 Research by Malaiskiene et al presented that the impregnation of silica sol into fireclay-based castables formed a denser and thinner glassy barrier on the sample surface, and further reduced the penetration of potassium-containing liquid phases, significantly improving the corrosion and penetration resistance to alkaline compounds.…”

“…Previous researches showed that the suspensions or colloidal solutions impregnation treatment is one of the effective methods to improve microstructure, mechanical properties and thermal insulation performance of refractories 23–27 . Works by Jin et al.…”