Properties of Si3N4 Based Nanocomposites Prepared by Pressureless Sintering Method

Ming Li Li; Qiong Yu; Ying Xu; Qing Guo Lu; Chun Jiang Zhou

doi:10.4028/www.scientific.net/AMR.532-533.53

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 532-533Properties of Si3N4 Based Nanocomposites Prepared...

Properties of Si₃N₄ Based Nanocomposites Prepared by Pressureless Sintering Method

Abstract:

Si₃N₄ based nanocomposites were prepared with nano-sized amorphous SiO₂ and Si₃N₄ powders by pressureless sintering method. The microstructures, phase composition, mechanical and dielectric properties of the nanocomposites were investigated. The scanning electrical microscope (SEM) photographs reveal that the grains are big and elongated. The X-ray diffraction (XRD) analysis shows that the main crystalline phase in the composites is Si₂N₂O formed during the sintering process. More β-Si₃N₄ phases were retained in the nanocomposites with the increase amount of the amorphous Si₃N₄ powders and no phase of SiO₂ were observed. The densities and the strength of the nanocomposites decreased with the increase of amorphous SiO₂ content. Despite low density, the flexural strengths of the composites reaches 220MPa and the ceramic has excellent dielectric properties with dielectric constant as low as 3.2-4.7 and dielectric loss in the range 2.6-3.9×10^-3.

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Advanced Materials Research (Volumes 532-533)

Pages:

53-56

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.532-533.53

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Online since:

June 2012

Authors:

Ming Li Li, Qiong Yu, Ying Xu, Qing Guo Lu, Chun Jiang Zhou

Keywords:

Dielectric Constant, Dielectric Loss, Microstructure, Si₃N₄ Based Nanocomposites, Strength

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