MgAlON-MgAl2O4复合材料的制备与性能研究  

Preparation and properties of MgAlON-MgAl_2O_4 composites

作　　者：黄俊伟 李红霞[2] 徐恩霞[1] 王刚[2] Huang Junwei;Li Hongxia;Xu Enxia;Wang Gang(Henan Key laboratory of High Temperature Functional Ceramics,Zhengzhou University,Zhengzhou 450052,Henan,China)

机构地区：[1]郑州大学河南省高温功能材料重点实验室,河南郑州450052 [2]中钢集团洛阳耐火材料研究院有限公司先进耐火材料国家重点实验室,河南洛阳471039

出　　处：《耐火材料》2018年第3期188-191,共4页Refractories

基　　金：NSFC-河南省联合基金重点支持项目(U1604252)

摘　　要：为了制备具有良好性能的MgAlON-MgAl_2O_4复合材料以替代含铬耐火材料,以电熔镁铝尖晶石(粒度1~3、≤1和≤0.074 mm)、活性α-Al_2O_3粉(2~5μm)、Al粉(≤0.074 mm)、Mg O粉(≤0.044 mm)为原料,采用原位生成MgAlON的方法制备了MgAlON-MgAl_2O_4复合材料。通过调整配料中α-Al_2O_3粉+Al粉+Mg O混合粉(三者的质量比固定为76∶12∶12)的加入量(在整个固态配料中的质量分数分别为15%、20%、25%和30%)来调整MgAlON的设计生成量,研究了MgAlON设计生成量对MgAlON-MgAl_2O_4复合材料致密度、常温强度、物相组成和显微结构等的影响。结果表明:1)随着α-Al_2O_3-Al-Mg O混合粉加入量的增加,复合材料中MgAlON相生成量增多;但当α-Al_2O_3+Al+Mg O混合粉加入量达到30%(w)时,复合材料中有副产物Al4O4C生成。2)随着α-Al_2O_3+Al+Mg O混合粉加入量从15%(w)增加到25%(w),复合材料中MgAlON晶粒发育程度逐渐变好,与MgAl_2O_4颗粒的结合也逐渐紧密;但当α-Al_2O_3+Al+Mg O混合粉加入量达到30%(w)时,复合材料基质中有明显微气孔出现,致密性和均匀性变差。3)随着α-Al_2O_3+Al+Mg O混合粉加入量的增加,复合材料的烧后体积密度和显气孔率变化不大,常温耐压强度和常温抗折强度变化明显,烧成线变化率由微收缩变为微膨胀。4)综合考虑,α-Al_2O_3+Al+Mg O混合粉加入量为25%(w)的试样的性能最佳。In order to synthesize MgAlON-MgAl2O4 composites with excellent properties to replace the chrome-based refractories,fused magnesium aluminate spinel（particle size 1-3,≤1 and ≤ 0. 074 mm）,active α-Al2O3 powder（2-5 μm）,Al powder（≤0. 074 mm）,Mg O powder（≤0. 044 mm） were used as starting materials to prepare MgAlON-MgAl2O4 composites by the in-situ MgAlON formation method. The addition（15%,20%,25%,and 30%,by mass） of α-Al2O3 powder ＋ Al powder ＋ Mg O powder（the mass ratio is fixed at 76 12 12,short for the mixing powder hereinafter） was adjusted to change the MgAlON design formation amount and its influence on the density,cold strength,phase composition and microstructure of the MgAlON-MgAl2O4 composites was researched. The results show that：（1） with the increase of the mixing powder,the formation amount of MgAlON increases in the composites; but when the mixing powder addition reaches 30%,a by-product Al4O4C forms in the composites;（2） with the mixing powder addition increases from 15% to 25%,the MgAlON crystals develop better and combine closer with the MgAl2O4 particles in the composites; but when the mixing powder addition reaches 30%,obvious micropores are observed in the matrix leading to the low density and poor uniformity;（3） with the increase of the mixing powder addition,the volume density and apparent porosity of the composites change mildly after firing; but the cold compressive strength and flexural strength change significantly; the composites change from slight shrinkage to slight expansion;（4） to sum up,the specimen with the mixing powder of 25% has the best comprehensive performance.

关 键 词：无铬化 镁铝尖晶石 镁阿隆 原位生成 MgAlON-MgAl2O4复合材料 

分 类 号：TQ132.2[化学工程—无机化工]