ZrO<sub>2</sub>添加对六铝酸钙陶瓷微观结构及力学性能的影响

doi:10.11896/cldb.24110086

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Abstract Calcium hexaluminate(CaAl₁₂O₁₉) is widely used in high-temperature ceramics and refractories due to its excellent fracture toughness, che-mical stability, and high refractoriness. However, its anisotropic grain growth adversely affects its sintering behavior, requiring temperatures of over 1 750 ℃ for full densification. This work investigated the influence of ZrO₂ addition on the densification, microstructure, and mechanical properties of CaAl₁₂O₁₉ ceramics. The poor sinterability of calcium hexaluminate ceramics is primarily attributed to the formation of plate-like CaAl₁₂O₁₉ crystals, which results in an apparent porosity of 26.7% after sintering at 1 600 ℃. The added Zr⁴⁺ can be uniformly dissolved in the CaAl₁₂O₁₉ grains by substituting Al³⁺ in the mirror planes, thereby enhancing the sintering activity and grain growth. Additionally, the formation of substitutional solid solutions effectively suppresses anisotropic crystal growth and reduces the aspect ratio, accelerating the ion diffusion along both sides of the plate-like grains. The relative density increases from 71.5% to 93.7% with the addition of 3wt% ZrO₂, while the homogeneity of the microstructure is significantly improved, with only a few residual micro-pores. These changes lead to a substantial enhancement of the mechanical properties of calcium hexaluminate ceramics, with the flexural strength and fracture toughness increasing from 128 MPa and 3.5 MPa·m^1/2 to 228 MPa and 5.6 MPa·m^1/2, respectively. Furthermore, a decrease in the creep rate by one order of magnitude is achieved at 1 550 ℃ by ZrO₂ addition.

Key words： CaAl₁₂O₁₉ ceramics ZrO₂ microstructure mechanical property sintering behavior

Published: 10 August 2025 Online: 2025-08-13

CLC number:

TQ175.1

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	Articles by authors
	YIN Xueliang
	WANG Huifang
	YANG Xi
	XU Lei
	MA Beiyue

Cite this article:

YIN Xueliang,WANG Huifang,YANG Xi, et al. Optimizing the Microstructure and Mechanical Properties of Calcium Hexaluminate Ceramics by ZrO₂ Addition[J]. Materials Reports, 2025, 39(15): 24110086-5.

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https://www.mater-rep.com/EN/10.11896/cldb.24110086 OR https://www.mater-rep.com/EN/Y2025/V39/I15/24110086

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