α-Al<sub>2</sub>O<sub>3</sub>及硅溶胶强化处理对氧化硅基陶瓷型芯组织和性能的影响

doi:10.19976/j.cnki.43-1448/TF.2024098

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Abstract In this study, α-Al₂O₃ was selected as a mineralizer for the preparation of silica based ceramic cores used in precision casting. Techniques such as X-ray diffractometer, field emission scanning electron microscope, energy dispersive spectroscopy, and the three-point bending testing were employed to investigate the effects of mineralizer amount and silica sol strengthening treatment on the phase composition, microstructures, shrinkage rate, open porosity, density, and bending strength of the ceramic cores. The results indicate that α-Al₂O₃ exerts a dual effect on the ceramic cores. On one hand, it acts as a reinforcing phase that hinders the viscous flow of fused quartz and enhances the strength of the cores; on the other hand, its excellent high-temperature stability reduces the sintering density of the ceramic cores, leading to decreased shrinkage rates and strength. However, silica sol strengthening treatment effectively seals the pores and promotes sintering of the cores. After silica sol strengthening treatment, cores with w(α-Al₂O₃)=2% exhibit an increase in room temperature bending strength to 16.6 MPa and high-temperature bending strength to 37.5 MPa, meeting the application standards for ceramic cores in the precision casting industry.

Key words： precision casting SiO₂ ceramic core α-Al₂O₃ high temperature performance room temperature bending strength shrinkage rate

Received: 31 October 2024 Published: 15 April 2025

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	Articles by authors
	PENG Yonghui
	ZHOU Wentao
	KOU Baohong
	OUYANG Jing

Cite this article:

PENG Yonghui,ZHOU Wentao,KOU Baohong, et al. Effects of α-Al₂O₃ and silica sol strengthening treatment on the microstructure and performance of silica based ceramic cores[J]. Materials Science and Engineering of Powder Metallurgy, 2025, 30(2): 115-122.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2024098 OR http://pmbjb.csu.edu.cn/EN/Y2025/V30/I2/115

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