Experimental Study On The Preparation Of CMAS Glass Ceramics By Converter Slag

Without adding other nucleating agents, using converter slag in Guizhou steel and fly ash in a domestic power plant and using Fe2O3 and TiO2 as nucleating agent, glass-ceramics are prepared by sintering, which consites of crystal phase(Ca(Mg,Fe)Si2O6), Vice-crystalline phase wollastonite(Ca3(Si3O9))and the grain size of the slag glass ceramics 0.2-0.4μm. It improved the utilization significantly about this two litters. By methods of DTA、XRD、SEM and the others, this paper studies the crystallization behavior and micro-structure of the base glass and determine the optimal heat treatment system.Comprehensive dosage is 65% which steel slag and fly ash is used in this experiment. The research results show that: the optimal heat treatment system of the microcrystalline prepared : nucleation temperature is890℃, nucleation time is 2h, crystallization temperature is 1150℃,crystallization time is 2h. Performance parameters for glass-ceramics: acid resistance is 0.14%, alkali resistance is 0.015%, the density is 2.84g/cm3,compressive strength is 107.27 MPa, flexural strength is 74.89 MPa,microhardness is 756.97kgf/mm2.This paper discussed the Fe2+impact on entire crystallization of the glass-ceramic and microstructure and phase structure. When the content of Fe2+is below 3.13%, the main crystal phase of glass ceramic is gehlenite; when the content of Fe2+is increased to 5.45%, the main crystal phase of glass ceramic is turning into akermanite from gehlenite; when the content of Fe2+is increased to 7.77%, the main crystal phase is turning into diopside from akermanite.