Kinetics and Mechanism of Oxidation Induced Contraction of MgAl2O4 Spinel Carbon Composites Reinforced by Al4C3 in situ Reaction  

作　　者：YANG Mengyao XIAO Guoqing YANG Ding'ao YUAN Shouqian ZAO Jizeng ZHAO Wei GAO Song 杨梦瑶;XIAO Guoqing;YANG Ding'ao;YUAN Shouqian;ZHAO Jizeng;ZHAO Wei;GAO Song(ollege of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;Beijing LierHigh-Temperature Materials Co.,Ltd.,Beijing 102211,China;Luoyang Lier Refractories Co.,Ltd.,Luoyang 471023,China)

机构地区：[1]ollege of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China [2]Beijing LierHigh-Temperature Materials Co.,Ltd.,Beijing 102211,China [3]Luoyang Lier Refractories Co.,Ltd.,Luoyang 471023,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2020年第4期778-785,共8页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Torch Plan of China(No.2005EB031110);the National Scientific and Technique Program of Ninth-five Year Plan(96-22-01-19)。

摘　　要：Kinetics and mechanism of oxidation induced contraction of MgAl2O4 spinel carbon composites reinforced by Al4C3 in situ reaction were researched in air using vertical high temperature thermal dilatometer from 25℃to 1400℃.It is shown that oxidation induced contraction of MgAl2O4 spinel carbon composites reinforced Al4C3 in situ reaction is the common logarithm of oxidation time t and the oxygen partial pressure P inside MgAl2O4 spinel carbon composites reinforced by Al4C3 in situ reaction in air at 1400℃is as follows:P=F(-2.75×10^-4A+2.13×10^-3)lnt.The nonsteady diffusion kinetic equation of O2 at 1400℃inside the composites is as follows:J=De lnt.Acceleration of the total diffusional?flux of oxygen inside the composites at 1400℃is in inverse proportion to the oxidation time.The nonsteady state effective diffusion coefficient De of O2(g)inside the composites decreases in direct proportional to the increase of the amount of metallic aluminium.The method of preventing the oxidation induced contraction of MgAl2O4 spinel carbon composites reinforced by Al4C3 in situ reaction is to increase the amount of Al.The slag erosion index of MgO-Al2O3 spinel carbon composite reinforced by Al4C3 in situ reaction is 0.47 times that of MgO-CaO brick used in the lining above slag line area of a VOD stainless steel-making vessel.HMOR of MgO-Al2O3 spinel carbon composite reinforced by Al4C3 in situ reaction is 26.7 MPa,HMOR of the composite is 3.6 times the same as that of MgO-CaO brick used in the lining above slag line area of a VOD vessel.Its service life is two times as many as that of MgO-CaO brick.

关 键 词：KINETICS mechanism OXIDATION CONTRACTION MgAl2O4 spinel carbon Al4C3 in situ reaction 

分 类 号：TB33[一般工业技术—材料科学与工程]