MgAlON结合镁质、镁铝尖晶石质与刚玉质材料的组织与性能  

Microstructure and properties of MgAlON-bonded magnesia,magnesia-alumina spinel and corundum materials

作　　者：程竹[1,2] 孙加林[1] 吴学真[2] 陈肇友[2] 王金相[1,2] 万龙刚[2] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]中钢集团洛阳耐火材料研究院,洛阳471039

出　　处：《北京科技大学学报》2011年第11期1378-1386,共9页Journal of University of Science and Technology Beijing

摘　　要：采用反应烧结法制备了MgAlON结合的镁质、镁铝尖晶石质和刚玉质试样,研究了不同主晶相对MgAlON单相结合相形成温度的影响及化学反应引起的体积膨胀和氧化物挥发对材料烧结的影响.结果表明:虽然用以形成MgAlON结合相的混合细粉的组成和数量都相同,但MgAlON结合的镁质、镁铝尖晶石质和刚玉质试样中形成MgAlON单相结合相的温度是不同的,依次呈升高趋势;MgAlON结合镁质试样在烧成过程中体积显著膨胀,MgO大量挥发,烧后试样镁砂颗粒和基质结合松散,密度低,强度小;MgAlON结合刚玉试样在烧成过程中体积膨胀小,氧化物挥发少,烧后试样刚玉颗粒和基质结合紧密,密度较高,强度较大;而MgAlON结合镁铝尖晶石试样烧成过程中的体积膨胀量、氧化物挥发量,烧后试样颗粒和基质的结合程度、密度和强度都介于前两者之间.MgAlON-bonded magnesia,magnesia-alumina spinel and corundum materials were prepared by reaction sintering.The influence of different major phases on the formation temperature of single MgAlON bonding phase and that of volume expansion caused by chemical reactions and the vapouring of oxides on the sintering of the materials were studied.The results show that athough the mixed powders used to form MgAlON bonding phase have the same composition and the same amount,the temperatures at which single MgAlON bonding phase forms in MgAlON-bonded magnesia,magnesia-alumina spinel and corundum samples are different,and rise in turn.On the matter of MgAlON-bonded magnesia samples,the volume expands significantly and a big amount of MgO vapours during the sintering process,magnesia grains bond loosely with the matrix in the fired samples,and thus the samples have low bulk density and low compressive strength.For MgAlON-bonded corundum samples,the volume expands slightly and a small amount of oxides vapours during the sintering process,corundum grains bond tightly with the matrix in the fired samples,and therefore the samples have high bulk density and high compressive strength.As to MgAlON-bonded magnesia-alumina spinel samples,the volume expansion and the amount of oxides vapoured during the sintering process,the bonding between grains and the matrix in the fired samples,and the bulk density and compressive strength of the fired samples are all between those of the above two kinds of samples.

关 键 词：耐火材料 氧化镁 氧化铝 刚玉 烧结 组织 耐压强度 

分 类 号：TQ175.7[化学工程—硅酸盐工业]