Sc2O3加入量对菱镁矿制备镁砂性能的影响

doi:10.3969/j.issn.1001-1935.2023.02.012

耐火材料 ›› 2023, Vol. 57 ›› Issue (2): 145-148.DOI: 10.3969/j.issn.1001-1935.2023.02.012

Sc₂O₃加入量对菱镁矿制备镁砂性能的影响

陈露, 张玲, 孟昕, 杨雨轩, 万建强, 罗旭东, 游杰刚

辽宁科技大学材料与冶金学院辽宁鞍山 114051

收稿日期:2022-06-14 出版日期:2023-04-15 发布日期:2023-04-17
作者简介:陈露:女,1997年生,硕士研究生。E-mail:2731892599@qq.com
基金资助:
国家自然科学基金联合基金项目(U20A20239)。

Effect of Sc₂O₃ on properties of magnesia prepared from magnesite

Chen Lu, Zhang Ling, Meng Xin, Yang Yuxuan, Wan Jianqiang, Luo Xudong, You Jiegang

First author’s address: School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, Liaoning, China

Received:2022-06-14 Online:2023-04-15 Published:2023-04-17

摘要/Abstract

摘要： 为改善烧结镁砂性能,以菱镁矿经900 ℃煅烧后的轻烧氧化镁粉为主要原料,引入Sc₂O₃作为添加剂,经1 600 ℃煅烧3 h得到烧结镁砂试样。研究Sc₂O₃添加量(质量分数分别为0、1%、2%、3%和4%)对试样致密度、物相组成及显微结构的影响。结果表明:Sc₂O₃会固溶进入MgO晶粒并引起MgO晶格畸变,起到了活化晶格促进烧结的作用;同时Sc₂O₃会与镁砂中杂质成分CaO发生反应,在方镁石晶间生成高熔点的CaSc₂O₄相。因此,添加Sc₂O₃提高了试样致密度,当加入3%(w)时,致密性最好。

关键词: 菱镁矿, 镁砂, Sc₂O₃, CaSc₂O₄, 显微结构, 物相组成

Abstract: In order to improve the properties of sintered magnesia,the light burned magnesia powder prepared by calcining magnesite at 900 ℃ was used as the main raw material and Sc₂O₃ was introduced as an additive.Sintered magnesia samples were obtained by calcining them at 1 600 ℃ for 3 h.Effects of the Sc₂O₃ addition (0,1%,2%,3% and 4%,by mass) on the density,the phase composition and the microstructure of the samples were studied.The results show that Sc₂O₃ can dissolve into MgO grains and cause lattice distortion of MgO,activating the lattice and promoting the sintering.At the same time,Sc₂O₃ reacts with the impurity CaO in magnesia to generate high-melting point phase CaSc₂O₄ among magnesite crystals.Therefore,adding Sc₂O₃ increases the density of the samples,and with 3% Sc₂O₃,the densification is the best.

Key words: magnesite, magnesia, Sc₂O₃, CaSc₂O₄, microstructure, phase composition

中图分类号:

TQ175

陈露, 张玲, 孟昕, 杨雨轩, 万建强, 罗旭东, 游杰刚. Sc₂O₃加入量对菱镁矿制备镁砂性能的影响[J]. 耐火材料, 2023, 57(2): 145-148.

Chen Lu, Zhang Ling, Meng Xin, Yang Yuxuan, Wan Jianqiang, Luo Xudong, You Jiegang. Effect of Sc₂O₃ on properties of magnesia prepared from magnesite[J]. Refractories, 2023, 57(2): 145-148.

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Sc₂O₃加入量对菱镁矿制备镁砂性能的影响

Effect of Sc₂O₃ on properties of magnesia prepared from magnesite

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