NiO对镁铝尖晶石反应烧结性能的影响

人工晶体学报 ›› 2022, Vol. 51 ›› Issue (12): 2125-2130.

NiO对镁铝尖晶石反应烧结性能的影响

付应文¹, 许欢¹, 王芳¹, 吴俊², 张梦贤¹, 张汪年¹

1.九江学院材料科学与工程学院,九江 332005;
2.江西安天高新材料股份有限公司,九江 332100

收稿日期:2022-07-22 出版日期:2022-12-15 发布日期:2023-01-09
通讯作者: 许欢,博士,讲师。E-mail:xuhuan_wust@126.com
作者简介:付应文(2001—),男,江西省人。E-mail:2931823755@qq.com
基金资助:
江西省教育厅科学技术研究项目(GJJ201833);省部共建耐火材料与冶金国家重点实验室开放基金(G202006);江西省高等学校大学生创新创业训练计划项目(S202011843003)

Effect of NiO Addition on Reaction Sintering Performance of MgAl₂O₄

FU Yingwen¹, XU Huan¹, WANG Fang¹, WU Jun², ZHANG Mengxian¹, ZHANG Wangnian¹

1. School of Materials Science and Engineering, Jiujiang University, Jiujiang 332005, China;
2. Jiangxi Astre Advanced Material Co., Ltd., Jiujian 332100, China

Received:2022-07-22 Online:2022-12-15 Published:2023-01-09

摘要/Abstract

摘要： 本文以高纯电熔镁砂和煅烧活性氧化铝粉为原料,以氧化亚镍(NiO)为添加剂,通过传统固相烧结法制备镁铝尖晶石材料。将MgO和Al₂O₃粉按理论摩尔比1∶1进行配料,在体系中分别引入质量分数为0%、0.5%、1.0%、1.5%、2.0%的NiO。利用X射线衍射(XRD)仪、扫描电子显微镜(SEM)和能谱仪(EDS)对烧结后试样进行分析,研究了NiO的添加对MgAl₂O₄材料烧结性能、物相组成及显微结构的影响。结果表明:引入适量的NiO可以显著促进MgAl₂O₄相的形成以及晶粒的发育长大;在1 600 ℃时,当NiO含量低于1.5%时,NiO能完全溶入MgAl₂O₄晶格并优先取代Al³⁺,提高了MgAl₂O₄晶体内部的缺陷浓度,活化了晶格,从而促进MgAl₂O₄的烧结。当NiO含量高于1.5%时,其内部开始出现较多第二相NiO,阻碍了物质的迁移和传输,反而不利于MgAl₂O₄烧结性能的提高。

关键词: 镁铝尖晶石, NiO, 反应烧结, 显微结构, 烧结助剂, 体积密度

Abstract: In this paper, magnesium aluminate spinel (MgAl₂O₄) materials were prepared by traditional solid-phase sintering method with high purity fused magnesia and calcined active aluminum powder as raw materials, and NiO as additive. The MgO and Al₂O₃ powders were mixed in a theoretical molar ratio of 1∶1, and NiO with mass fraction of 0%, 0.5%, 1.0%, 1.5%, and 2.0% NiO were introduced into the system, respectively. The effects of NiO addition on sintering properties, phase composition and microstructure of MgAl₂O₄ were studied by X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The results show that the introduction of appropriate amount of NiO can significantly promote the formation of MgAl₂O₄ phase and grain growth. At 1 600 ℃, when the NiO content is lower than 1.5%, NiO can completely dissolve into MgAl₂O₄ crystal lattice and preferentially replace Al³⁺, which improves the defect concentration in MgAl₂O₄ crystal and activates the lattice, thus promoting the sintering of MgAl₂O₄. When the NiO content is higher than 1.5%, more second phase NiO appears in the MgAl₂O₄, which hinders the mass migration and transmission, and it is not conducive to the improvement of sintering performance of MgAl₂O₄.

Key words: magnesium aluminate spinel, NiO, reaction sintering, microstructure, sintering additive, bulk density

中图分类号:

TQ175.1

付应文, 许欢, 王芳, 吴俊, 张梦贤, 张汪年. NiO对镁铝尖晶石反应烧结性能的影响[J]. 人工晶体学报, 2022, 51(12): 2125-2130.

FU Yingwen, XU Huan, WANG Fang, WU Jun, ZHANG Mengxian, ZHANG Wangnian. Effect of NiO Addition on Reaction Sintering Performance of MgAl₂O₄[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2022, 51(12): 2125-2130.

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