Post-mortem Microstructural Study of Aluminous Refractory Brick Used in Channels of Blast Furnaces

作     者：Ana Valéria de Sousa COSTA Belmira Benedita de LIMA-KUHN Antonio Renato BIGANSOLLI Ana Valéria de Sousa COSTA;Belmira Benedita de LIMA-KüHN;Antonio Renato BIGANSOLLI

作者机构：Department of Chemical EngineeringTechnology InstituteFederal Rural University of Rio de JaneiroSeropédica 23851-970Brazil 

出 版 物：《China's Refractories》 (中国耐火材料（英文版）)

年 卷 期：2023年第32卷第1期

页      面：40-43页

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：acknowledged DEQ/IT/UFRRJ FEG/UNESP-Guaratinguetáand EEL/USP-Lorena for their support in carrying out the analyses 

主　　题：aluminous refractories steel industry microstructural blast furnace 

摘      要：Aluminous refractory materials with high alumina contents are widely used in the steel industry,and the higher the alumina content,the higher the working *** such as high refractoriness and thermal shock resistance lead these refractory materials to be used as channel linings of blast furnaces,where they are exposed to the attack by slag,molten steel,working cycles and sudden temperature changes between 25℃(room temperature)and 1520℃(the temperature of molten pig iron).In this work,microstructural changes in post-mortem aluminous refractory bricks were investigated by apparent porosity,X-ray diffraction analysis(XRD),Fourier transform infrared spectroscopy(FTIR),scanning electron microscopy,and X-ray dispersion energy spectrometry(SEM/EDS).The results showed an increase in the apparent porosity and the bulk density and the presence of the phases mullite,sillimanite,alumina,and quartz in the post-mortem *** and magnesium were not detected in the microstructure of the post-mortem brick,indicating that slags did not corrode these refractory ***,the microstructural changes that occurred in the post-mortem bricks must be due to thermal *** the X-ray diffraction(XRD)test,mullite,sillimanite,quartz,andα-alumina phases were *** results indicate that the aluminous refractory was obtained from *** infrared spectroscopy(FTIR)it was possible to identify the vibration bands referring to the Si-O and Al-O *** increase in the porosity is a result of cracks caused by work cycles at high temperatures and the temperature gradient to which the refractory was subjected during *** the micrograph it was possible to identify the presence of acicular *** absence of magnesium and calcium in the microanalysis results by energy dispersed X-ray spectrometry(EDS)indicates that there was no infiltration by slag or liquid *** results indicate that the microstructural changes that occurred in t