Al粉加入量对凝胶粉结合铝镁不烧砖力学性能的影响  

Effects of Al Addition on Mechanical Properties of Gel Powder Bonded Al_2O_3-MgO Unfired Bricks

作　　者：牛森森[1] 涂军波[1] 魏军从[1] 

机构地区：[1]河北理工大学材料学院河北省无机非金属材料重点实验室,唐山063009

出　　处：《硅酸盐通报》2010年第4期930-934,共5页Bulletin of the Chinese Ceramic Society

基　　金：河北省自然科学基金资助(E2009000784);河北省教育厅资助(2008453)

摘　　要：以各种粒径的棕刚玉、白刚玉(<0.047 mm)、镁砂细粉和α-Al2O3为主要原料,铝凝胶粉为结合剂,研究了铝粉加入量对精炼钢包铝镁不烧砖线变化率、抗折强度、耐压强度、显气孔率、体积密度和高温抗折强度的影响,并借助XRD和SEM研究了不烧砖的物相组成和显微结构。结果表明:随着铝粉量的增加,借助于塑性相成型,不烧砖烘干后的显气孔率减小、体积密度增大,抗折、耐压强度增大;在热处理过程中,铝粉一方面促进烧结,另一方面由于铝粉被氧化导致体积膨胀,并占主导地位,使得不烧砖显气孔率增大,体积密度减小,强度先增大后减小。高温抗折强度随铝粉加入量的增加而增大。The effects of addition of alumium fines on the properties of Al2O3-MgO unfired bricks for refining ladel were investigated using brown corundum, white corundum（ 〈 0. 047 mm）, magnesia fines and α-Al2O3 as the main raw material, and Al2O3-SiO2 gel powder as binder. The emphasis focused on the properties of linear change rate, Modulus of rupture （MOR）, compressive strength, apparent porosity, bulk density and hot modulus of rupture （HMOR）. The phase compositions and microstructure were determined by means of X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The results showed that as the increasing of the addition of metal Al powder, apparent porosity of the material decreased and bulk density, MOR and compressive strength increased due to plastic phase pressing at the normal temperature; After sintered, apparent porosity of the material increased, bulk density reduced, and MOR first inceased and then dropped. During heat treatment, alumium metal help to sinter contributing to shinkage of the material ; meantime, aluminum would oxide causing dimensional expansion which dominated. HMOR increased as the addition of metal Al powder.

关 键 词：铝镁不烧砖 精炼钢包 铝粉 凝胶粉 力学性能 

分 类 号：TU54[建筑科学—建筑技术科学]