Structural Evolution of Cr2AlB2 Powder and Its Effect on Properties in Al2O3–C Refractories at High Temperature

被引：0

作者：

Zhang Y. ^{[1
,2
]}

Li Y. ^{[1
,2
]}

Liao N. ^{[1
,2
]}

Liu G. ^{[1
,2
]}

Ji Z. ^{[1
,2
]}

机构：

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

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

来源：

Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2023年 / 51卷 / 03期

关键词：

alumina-carbon refractories; chromium aluminium boride; mechanical properties; oxidation resistance; structural evolution;

D O I：

10.14062/j.issn.0454-5648.20221010

中图分类号：

学科分类号：

摘要：

Al2O3–C refractories are important for the continuous casting process. It is essential for safe and effective steel making processes to enhance the strength and oxidation resistance of Al2O3–C refractories. A compound MAB phase Cr2AlB2 has attracted recent attention due to its high fracture toughness, high damage tolerance and excellent oxidation resistance. In this work, a ternary layered compound Cr2AlB2 was introduced into the Al2O3–C refractories. The structural evolution of Cr2AlB2 in Al2O3–C refractories after treated at different temperatures and its effect on the comprehensive properties of Al2O3–C refractories were analyzed by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results show that a gradual decomposition of Cr2AlB2 in Al2O3–C refractories generates a core–shell structure of CrB and Al2O3 covered with Al2O3, and catalyses the formation of carbon nanotubes and carbon fibers on the surface of the core–shell structure after thermal treatment at 800–1 200 ℃. Cr3C2 covered by BN structure is formed inside the core-shell structure after thermal treatment at 1 200–1 600 ℃. As a result, the densification of Al2O3–C refractories is facilitated, and the cold modulus of rupture and oxidation resistance is enhanced. The cold modulus of rupture after coking at 1 400–1 600 ℃ is increased by approximately 9%, and the oxide index after treated in air at 1 400 ℃ is reduced from 44% to 31%. © 2023 Chinese Ceramic Society. All rights reserved.

引用

页码：579 / 588

页数：9

共 31 条

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