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Fabrication, Properties of Dense CA6 Refractory and Its Reaction Behavior with Titanium Aluminum Alloy

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Fabrication, Properties of Dense CA6 Refractory and Its Reaction Behavior with Titanium Aluminum Alloy

Suzhen Han 1,2 Lvping Fu 1,2,3,*,† Changmao Peng 1,2 Ning Liu 1,2 Huazhi Gu 1,2 Jiuxi Zhou 3 Ao Huang 1,2
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1
State Key Laboratory of Advanced Refractories, Wuhan University of Science and Technology, Wuhan 430081, China
2
Joint International Research Laboratory of Refractories and Metallurgy, Ministry of Education, Wuhan 430081, China
3
Taizhou Wangxin Refractory Co., Ltd., Taizhou 225300, China
*
Authors to whom correspondence should be addressed.
†
Permanent Address: No. 947 Heping Avenue, Qingshan District, Wuhan 430081, China

Received: 22 September 2025 Revised: 30 October 2025 Accepted: 19 December 2025 Published: 30 December 2025

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© 2025 The authors. This is an open access article under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/).

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High-Temp. Mat. 2025, 2(4), 10024; DOI: 10.70322/htm.2025.10024
ABSTRACT: The key objective in the production of titanium-aluminum alloys by vacuum induction melting technology is to develop crucible materials with excellent thermal stability and thermal shock resistance. In this work, a dense CA6 (calcium hexaluminate) refractory material was successfully prepared by a two-step sintering method using industrial Al2O3 and CaCO3 as raw materials. The properties of CA6 refractory and its refaction behavior with Ti6Al4V alloy were investigated, by setting Al2O3 and CA6-Al2O3 materials as control groups. The CA6 refractory showed the highest flexural strength and medium thermal shock resistance. By comparing the reaction behavior of different crucibles with Ti6Al4V alloy, the pure CA6 crucible showed the best resistance to alloy corrosion. It was almost not eroded after melting (only ~100 μm of penetration was observed), and the alloy was the least polluted. Based on the excellent chemical stability and thermal shock resistance of CA6, it could be a potential titanium aluminum alloy smelting material.
Keywords: CA6; Titanium aluminum alloy; Reaction interface; Chemical stability
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