Preparation and Thermal Shock Behavior of MgO-ZrO2 Refractory Aggregates

被引：0

作者：

Mi Y. ^{[1
,2
]}

Xu Y. ^{[1
,2
]}

Li Y. ^{[1
,2
]}

Sang S. ^{[1
,2
]}

Wang Q. ^{[1
,2
]}

Zhu T. ^{[1
,2
]}

Liao N. ^{[1
,2
]}

Dai Y. ^{[1
,2
]}

机构：

[1] The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan

[2] National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan

来源：

Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2021年 / 49卷 / 12期

关键词：

Coefficient of thermal expansion; Fracture toughness; Magnesium oxide; Thermal conductivity; Thermal shock resistance; Zirconia;

D O I：

10.14062/j.issn.0454-5648.20210098

中图分类号：

学科分类号：

摘要：

In order to improve the thermal shock resistance of magnesia aggregates, MgO-ZrO2 refractory aggregates were prepared at 1600℃ via adding 5% (in mass fraction), 10%, 15% and 20% of m-ZrO2 powder into light burned magnesia powder. The effect of ZrO2 content on the sintering behavior, microstructure, mechanical properties, thermal properties and thermal shock resistance was investigated. The results show that ZrO2 is mainly distributed at the grain boundary of periclase, which can inhibit the abnormal growth of periclase grains and promote the discharge of pores. Some m-ZrO2 interacts with MgO to form c-ZrO2 solid solution, thus activating the periclase lattice and promoting the sintering and densification of specimens. However, more than 10% ZrO2 addition can lead to the more micron-cracks formation at the grain boundary of MgO, which can slightly reduce the density of the specimens. For a specimen with ZrO2, the strength of the specimen reduces slightly and the main crack propagation mode becomes intergranular fracture due to the weakened intergranular bonding of periclase. Also, crack deflection and branching effect occurs after adding ZrO2, leading to an improvement of the fracture toughness KIC, and the specimen with 20% ZrO2 addition has the optimum KIC due to its smallest MgO grain and the longest crack propagation path. In addition, although the addition of ZrO2 results in a decreasing thermal conductivity λ, the KIC of the specimen increases and the coefficient of thermal expansion α decreases, the thermal shock resistance of the specimen improves. The specimen with 5% ZrO2 addition has an optimum thermal shock resistance due to its maximum residual flexural strength and residual flexural strength retention rate. © 2021, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.

引用

页码：2760 / 2766

页数：6

共 31 条

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