| TiO2的添加对铝铬固溶体烧结动力学的影响 |
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| 引用本文： | 李人骏,张玲,张晓序,王志刚,胡於江.TiO2的添加对铝铬固溶体烧结动力学的影响[J].硅酸盐通报,2021,40(6):2104-2109. |
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| 作者姓名： | 李人骏 张玲 张晓序 王志刚 胡於江 |
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| 作者单位： | 辽宁科技大学材料与冶金学院,鞍山 114051 |
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| 基金项目： | 国家自然科学基金区域联合基金(U20A20239) |
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| 摘 要： | 铝铬固溶体被广泛应用于耐火材料,其烧结致密化较难,添加一定量的烧结助剂有利于提高铝铬固溶体的致密程度,但对于致密化过程中的晶粒生长规律尚不清楚。在本工作中以纳米η-Al2O3和工业铬绿为原料,加入烧结助剂TiO2,并以PVA作为结合剂,经过冷等静压成型后在常压下1 400~1 700 ℃进行固相烧结制备摩尔比1∶1的烧结铝铬固溶体。利用Archimedes法、XRD、SEM、Nano measurer等手段分析了烧后试样的致密度、物相组成、显微结构和平均晶粒尺寸,在此基础上进一步计算研究了TiO2的添加对铝铬固溶体的烧结动力学的影响。结果表明:在烧结过程中,Al2O3-Cr2O3和Al2O3-Cr2O3-2%TiO2烧结体系的晶粒生长指数和晶粒生长活化能均随温度升高而减小;Al2O3-Cr2O3体系晶粒生长主要受原子随机越过晶界和体积扩散两种机制控制,Al2O3-Cr2O3-2%TiO2体系晶粒生长主要受体积扩散控制;对比两种体系发现TiO2的添加能使样品的晶粒生长指数和晶粒生长活化能下降,促进晶粒生长发育。
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| 关 键 词： | 纳米η-Al2O3 铝铬固溶体 固相烧结 烧结助剂 晶粒生长 烧结动力学 |
| 收稿时间： | 2020-12-14 |
Effect of TiO2 Addition on Sintering Kinetics of Aluminum and Chromium Solid Solution |
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| LI Renjun,ZHANG Ling,ZHANG Xiaoxu,WANG Zhigang,HU Yujiang.Effect of TiO2 Addition on Sintering Kinetics of Aluminum and Chromium Solid Solution[J].Bulletin of the Chinese Ceramic Society,2021,40(6):2104-2109. |
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| Authors: | LI Renjun ZHANG Ling ZHANG Xiaoxu WANG Zhigang HU Yujiang |
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| Affiliation: | School of Materials and Metallurgy, Liaoning Science and Technology University, Anshan 114051, China |
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| Abstract: | Aluminum chromium solid solution is widely used in refractory materials, but it’s hard to achieve sintering and densification. Adding a certain amount of sintering additives can effectively improve its density, but the rule of grain growth in the densification process is still unclear. In this experiment, nano η-Al2O3 and industrial chromium green were used as raw materials, with TiO2 as sintering aid and PVA as the binder, after being formed by cold isostatic pressing, the sintered aluminum chromium solid solution with the mole ratio of 1∶1 was prepared by solid phase sintering at 1 400 ℃ to 1 700 ℃ under normal pressure. The density, phase composition, microstructure, and average grain size of the sintered samples were analyzed by Archimedes method, XRD, SEM, and Nano measurer. On this basis, the effect of TiO2 on sintering kinetics of aluminum chromium solid solution was further calculated and studied. The results show that during the sintering process, the grain growth index and activation energy of Al2O3-Cr2O3 and Al2O3-Cr2O3-2%TiO2 sintered systems decrease with the increase of temperature. The grain growth of Al2O3-Cr2O3 system is mainly controlled by atoms crossing grain boundaries randomly and volume diffusion, the grain growth of the Al2O3-Cr2O3-2%TiO2 system is mainly controlled by volume diffusion. Compared with the two systems, it is found that the addition of TiO2 can decrease the grain growth index and activation energy of grain growth, and promote the grain growth and its development. |
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| Keywords: | nano-η-Al2O3 aluminum chromium solid solution solid phase sintering sintering additive grain growth sintering kinetics |
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