SiC浆料的流变性能及多孔陶瓷的直写成型

doi:10.19976/j.cnki.43-1448/TF.2023067

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Abstract In order to achieve precise control and free design of pore structure and size in porous SiC ceramics, based on the direct-ink writing of SiC porous ceramics, the effects of dispersant type and content, pH value, solid phase volume fraction, and thickener on the rheological properties of SiC slurry were studied, and then 3D porous structured SiC ceramics with controllable pore structure and size were prepared using the optimized slurry. The results indicate that the viscosity of slurry decreases first and then increases with the increment of the content of dispersant tetramethylammonium hydroxide (TMAH); pH value greater than 10 is conducive to reducing the viscosity of the slurry; the viscosity of slurry increases first and then decreases with the increment of solid phase volume fraction, having a maximum achievable solid volume fraction of 60%; the yield stress of the slurry continuously increases with increasing the addition of methyl cellulose (MC) as thickener. Optimized SiC slurry is obtained with TMAH mass fraction of 0.4%, pH value >10, solid phase volume fraction of 60%, and MC mass fraction of 0.06%. The SiC porous ceramics produced by using the slurry and direct-ink writing exhibit the advantages of high structural integrity and low drying shrinkage rate.

Key words： SiC porous ceramic direct-ink writing rheological property solid phase volume fraction

Received: 07 August 2023 Published: 23 January 2024

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TQ174.62

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	Articles by authors
	WANG Xiaofeng
	LIU Zirui
	ZHOU Hongli
	PENG Xiang
	WANG Richu
	ZENG Jing

Cite this article:

WANG Xiaofeng,LIU Zirui,ZHOU Hongli, et al. Rheological properties of SiC slurry and direct-ink writing of porous ceramic[J]. Materials Science and Engineering of Powder Metallurgy, 2023, 28(6): 580-586.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2023067 OR http://pmbjb.csu.edu.cn/EN/Y2023/V28/I6/580

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