| Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Sciences | Host |
| Citation: |
FENG Yu, GAO Yongjun, LUO Xudong, LI Xinwei, WANG Lin, WU Feng. Study on the Properties of Magnesia Zirconia Composite Materials Synthesized from Different Grades of Magnesite[J]. Conservation and Utilization of Mineral Resources, 2023, 43(2): 154-161. doi: 10.13779/j.cnki.issn1001-0076.2023.02.024
|
Study on the Properties of Magnesia Zirconia Composite Materials Synthesized from Different Grades of Magnesite
-
Abstract
The samples of magnesia zirconia composite materials were prepared with three kinds of different grades of magnesite, namely Haicheng grade I magnesite, Haicheng grade II magnesite and Xiuyan II grade magnesite (MgCO3) and desilication zirconium (ZrO2) as raw materials in order to produce substitute for magnesia−chromite brick of RH refining furnace. The bulk density, apparent porosity, thermal shock resistance and phase composition of the samples were tested. The microstructure of the samples was analyzed. The effects of different sintering temperatures on the sintering properties and thermal shock resistance of magnesia zirconia composite were investigated. The results show that the bulk density was increased, the apparent porosity was reduced, and the linear shrinkage was increased with the temperature increasing. The maximum bulk density of the magnesia zirconia composite prepared with Xiuyan Grade II magnesite and desiliconized zirconia fired at 1700 ℃ was 3.26 g∙cm−3. The minimum apparent porosity of the magnesia zirconia composite prepared with Haicheng Grade II magnesite and desiliconized zirconia fired at 1700 ℃ was 5.69%. The c−ZrO2 solid solution (Zr0.875Mg0.125O1.875) was formed from three different grades of magnesite and ZrO2. The impurities of SiO2 and CaO in magnesite were combined with MgO to form low melting point phase, which increased the density of samples and promoted sintering; The CaZrO3 and c−ZrO2 (Zr0.8Ca0.2O1.8Zr0.8) were formed at 1700 ℃ from the magnesia zirconia composite prepared from Xiuyan Grade II magnesite and desiliconized zirconia; The mismatch of the thermal expansion coefficients of CaZrO3 and c−ZrO2 with periclase resulted in microcrack toughening and ZrO2 phase transformation toughening during the cooling process, which made the magnesia zirconia composite sample prepared from Xiuyan Grade II magnesite and desiliconized zirconia at 1700 ℃ have the best thermal shock resistance.
-
Keywords:
- magnesite /
- zirconia /
- magnesia zirconia composite material /
- sinter ability /
- thermal shock resistance /
- CaZrO3
-
-
References
[1] CHEN S L, LIN Y, ZHONG Q F, et al. Corrosion resistance mechanism of MgO-ZrO2 brick in RH degasser slag[J]. Advanced Materials Research, 2012, 43(5): 549−554. [2] 朱新伟, 邱文冬, 梁永和, 等. 电熔镁锆砂加入量对RH精炼炉用刚玉-尖晶石浇注料性能的影响[J]. 耐火材料, 2013, 47(3): 190−193. doi: 10.3969/j.issn.1001-1935.2013.03.009 ZHU X W, QIU W D, LIANG Y H, et al. Influence of fused MgO-ZrO2 addition on properties of corundum-spinel castables for RH degassers[J]. Refractories, 2013, 47(3): 190−193. doi: 10.3969/j.issn.1001-1935.2013.03.009 [3] 凌永一, 王珍, 张婧, 等. MgO-ZrO2质耐火材料研究进展[J]. 耐火材料, 2021, 55(1): 81−88. LING Y Y, WANG Z, ZHANG J, et al. Research progress of MgO-ZrO2 refractories[J]. Refractories, 2021, 55(1): 81−88. [4] KUSIOROWSKI R, WOJSA J, PSIUK B, et al. Influence of zirconia addition on the properties of magnesia refractories[J]. Ceram Int, 2016, 42(9): 11373−11386. doi: 10.1016/j.ceramint.2016.04.065 [5] 郭玉香, 栾舰, 田凤仁. 锆英石对镁砂烧结性及其制品性能的影响[J]. 耐火材料, 2001, 35(5): 281−282. GUO Y X, LUAN J, TIAN F R. Effect of ZrSiO4 on sintering of magnesia and properties of product containing magnesia[J]. Refractories, 2001, 35(5): 281−282. [6] 李亚芾, 付亮亮, 白浩隆, 等. 菱镁矿浮选尾矿直接合成同时制备镁橄榄石和镁砂研究[J]. 化工学报, 2022, 73(8): 3679−3687. LI Y F, FU L L, BAI H L, et al. The simultaneous synthesis of high-quality forsterite and sintered magnesia from magnesite flotation tailings[J]. CIESC Journal, 2022, 73(8): 3679−3687. [7] 郗悦, 代淑娟, 张作金, 等. 反浮选法提纯低品位菱镁矿研究进展[J]. 矿产综合利用, 2020(2): 29−36. XI Y, DAI S J, ZHANG Z J, et al. Research progress in purification of low-grade magnesite by reverse flotation[J]. Multipurpose Utilization of Mineral Resources, 2020(2): 29−36. [8] 徐勇强, 张真兴, 白雪杰, 等. 菱镁矿石的分选提纯及材料制备研究进展[J]. 矿产保护与利用, 2022, 42(2): 107−113. XU Y Q, ZHANG Z X, BAI X J, et al. Research progress on purification and material preparation of magnesite[J]. Conservation and Utilization of Mineral Resources, 2022, 42(2): 107−113. [9] ZOU Y, GU H, HUANG A, et al. Fabrication and properties of in situ intergranular CaZrO3 modified microporous magnesia aggregates[J]. Ceramics International, 2020, 46(10): 16956−16965. doi: 10.1016/j.ceramint.2020.03.279 [10] 刘辉敏, 刘缙. 氧化锆对铬刚玉浇注料烧结及抗热震性能的影响[J]. 硅酸盐学报, 2011, 39(3): 436−440. LIU H M, LIU J. Effect of ZrO2 addition on sintering and thermal shock resistance of Cr2O3-Al2O3 castable[J]. Journal of the Chinese Ceramic Society, 2011, 39(3): 436−440. [11] NADLER M R, FITZSIMMONS E S. Preparation and properties of calcium zirconate[J]. Journal of the American Ceramic Society, 1955, 38(6): 214−217. -
Access History
Figures(8)
Tables(5)
Export File
Citation
FENG Yu, GAO Yongjun, LUO Xudong, LI Xinwei, WANG Lin, WU Feng. Study on the Properties of Magnesia Zirconia Composite Materials Synthesized from Different Grades of Magnesite[J]. Conservation and Utilization of Mineral Resources, 2023, 43(2): 154-161. doi: 10.13779/j.cnki.issn1001-0076.2023.02.024
Format
Content
DownLoad:
-
Figure 1.
XRD patterns of magnesia zirconia composite material samples fired at different temperatures: （A）M1; （B）M2; （C）M3
-
Figure 2.
(a) SEM morphology of the magnesia zirconia composite material M1 sample after fired at 1700 ℃; (b) the enlarged area of figure a
-
Figure 3.
（c，d，e） SEM image of the magnesia zirconia composite material M2 sample after fired at 1700 ℃（Figures d and e are enlarged areas of Figure c）
-
Figure 4.
（f） burning after 1700 ℃ SEM topography magnesia zirconia composite material sample M3 （Figures g，h is an enlarged area of Figures f）
-
Figure 5.
Bulk density (a)，apparent porosity (b) and linear change rate (c) of magnesia zirconia composite material samples after fired at different temperatures
-
Figure 6.
Number of thermal shock cycles of fired magnesia zirconia composite material sample
-
Figure 7.
Linear expansion coefficient of magnesia zirconia composite material sample after fired at 1700 ℃
-
Figure 8.
SEM morphology of the magnesia-zirconium composite sample M3 fired at 1700 ℃ after thermal shock