冷冻干燥法制备高气孔率、低介电的Si<sub>3</sub>N<sub>4</sub>陶瓷

doi:10.11896/cldb.18090207

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Abstract Aporous Si₃N₄with low dielectric, directional bimodal pore size distribution was prepared by freeze-drying method, and Zeta potential, rheo-meter were used to study the effect of dispersant type, content and pH value on slurry. The results show that when the pH value is around 10, using NH₄-PAA as dispersing agent with the content of 0.8wt%, the slurry has the best dispersing effect. The effects of binder content and solid phase content on the microstructure and properties of porous ceramics were studied by mercury injection apparatus, XRD, SEM and vector network analyzer. The results showed that with the increase of binder content and solid phase content, the porosity of ceramics decreased and the mechanical properties enhanced. When the solid content increased from 15vol% to 40vol%, porosity declined from 82.9% to 40.6%, the bending strength increased from (1.2±0.2) MPa to (94.7±5) MPa, the compressive strength increased from (2.1±0.5) MPa to (314±8) MPa, the dielectric constant within 2.4 GHz to 18 GHz band increased from 1.5 to 3.7. Porous Si₃N₄ ceramics prepared by freeze-drying methods have broader application in the fields of filtration, catalyst carrier and wave-transparent materials.

Key words： free-drying method porous Si₃N₄ low dielectric high porosity

Published: 15 January 2020

CLC number:

TQ174

About author:: Xiaokun Sunreceived his bachelor's degree in July 2014 from Northwestern Polytechnical University (NWPU) in mechanical design manufacture and automation. Since 2014, he has been engaged in the Science and Technology on Thermostructural Composite Materials Laboratory of NWPU, focusing on the research of the ceramic matrix composite;Xiaochong Liureceived his Ph.D. degree in May 2013 from Northwestern Polytechnical University (NWPU) in material science. Then he stayed in the Science and Technology on Thermostructural Composite Mate-rials Laboratory of NWPU, focusing on the research of the ceramic matrix composite.

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	SUN Xiaokun
	SUN Mengyong
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	ZHAO Juan

Cite this article:

SUN Xiaokun,SUN Mengyong,LIU Xiaochong, et al. Research on Si₃N₄ with High Porosity and Low Dielectric Fabricated by Freeze-drying Method[J]. Materials Reports, 2020, 34(4): 4025-4031.

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http://www.mater-rep.com/EN/10.11896/cldb.18090207 OR http://www.mater-rep.com/EN/Y2020/V34/I4/4025

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