人工晶体学报, 2020, 49 (2): 319, 网络出版: 2020-06-15  

TiO2烧结助剂对纳米η-Al2O3制备Al2O3-Cr2O3固溶体的影响研究

Effect of TiO2 Sintering Aid on the Al2O3-Cr2O3 Solid Solution Prepared from Nano-η-Al2O3
作者单位
辽宁科技大学材料与冶金学院,鞍山 114051
摘要
以纳米η-Al2O3粉和工业铬绿为原料,以摩尔比1∶1配比制备Al2O3-Cr2O3固溶体,以TiO2为烧结助剂,在还原气氛下经1400 ℃、1500 ℃和1600 ℃固 相烧结。研究了TiO2的加入对纳米η-Al2O3制备Al2O3-Cr2O3固溶体的致密度、线收缩率、相组成、晶胞参数、互扩散程度和微观结构的影响。结果表明: TiO2的加入能促进Al2O3-Cr2O3固溶体的致密化;当温度为1600 ℃,TiO2的添加量为2wt%时,试样的体积密度最大为4.57 g?cm-3,线收缩率为19.8%;TiO2 的加入能使Al2O3-Cr2O3固溶体中Al3+和Cr3+的互扩散程度增加;微观结构表明,TiO2的加入能使Al2O3-Cr2O3固溶体晶粒之间结合更紧密,实验温度范围内, 随着TiO2添加量的增加晶粒从沿晶断裂向穿晶断裂转变,只在晶间和晶内存在极少量气孔,当温度为1600 ℃,TiO2的添加量为2wt%时,晶粒大小较均匀,平 均晶粒尺寸约10 μm。
Abstract
Al2O3-Cr2O3 solid solution was prepared using nano-η-Al2O3 powder and industrial chrome green as raw materials in a molar ratio of 1∶1. The solid phase sintering was carried out at 1400 ℃, 1500 ℃ and 1600 ℃ in a reducing atmosphere using TiO2 as sintering aid. The effects of TiO2 addition on the density, linear shrinkage, phase composition, unit cell parameters, degree of interdiffusion and microstructure of Al2O3-Cr2O3 solid solution prepared from nano-η-Al2O3 were studied. The results show that the addition of TiO2 can promote the densification of Al2O3-Cr2O3 solid solution. When the temperature is 1600 ℃ and the addition amount of TiO2 is 2wt%, the maximum bulk density of the sample is 4.57 g?cm-3, and the linear shrinkage is 19.8%; the addition of TiO2 can increase the degree of interdiffusion of Al3+ and Cr3+ in Al2O3-Cr2O3 solid solution;the microstructure shows that TiO2 can make the grains of Al2O3-Cr2O3 solid solution combine more closely. The addition of TiO2 increases the grain transition from crystal fracture to transgranular fracture, and there are only a small number of pores between and within the crystal, within the experimental temperature range. When the temperature is 1600 ℃ and the additive amount of TiO2 is 2wt%, the grain size is relatively uniform, with an average grain size of about 10 μm.

张晓序, 张玲, 李凤友, 郑培毓, 李人骏. TiO2烧结助剂对纳米η-Al2O3制备Al2O3-Cr2O3固溶体的影响研究[J]. 人工晶体学报, 2020, 49(2): 319. ZHANG Xiaoxu, ZHANG Ling, LI Fengyou, ZHENG Peiyu, LI Renjun. Effect of TiO2 Sintering Aid on the Al2O3-Cr2O3 Solid Solution Prepared from Nano-η-Al2O3[J]. Journal of Synthetic Crystals, 2020, 49(2): 319.

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