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http://dx.doi.org/10.9766/KIMST.2018.21.6.760

Tailoring the Dielectric and Mechanical Properties of Si3N4 Ceramics  

Lee, Seung Jun (The 4th Research and Development Institute, Agency for Defense Development)
Yong, Seok-Min (The 4th Research and Development Institute, Agency for Defense Development)
Park, Jin-Woo (The 4th Research and Development Institute, Agency for Defense Development)
Choi, Jaeho (The 4th Research and Development Institute, Agency for Defense Development)
Baek, Seungsu (The 4th Research and Development Institute, Agency for Defense Development)
Publication Information
Journal of the Korea Institute of Military Science and Technology / v.21, no.6, 2018 , pp. 760-766 More about this Journal
Abstract
The present study investigates the effect of PMMA and BN content on microstructure, mechanical and dielectric properties of silicon nitride($Si_3N_4$) ceramics in $Y_2O_3-Al_2O_3$ additive system. The total additive content was fixed at 8 wt.% and the amount of PMMA varies from 0 to 40 wt.% and BN varies from 0 to 36 wt.%, respectively. The crystalline phases of the samples were determined by X-ray diffraction analysis. All the sintered sample shows complete transformation of ${\alpha}$ to ${\beta}-Si_3N_4$ during the sintering process indicated that the phase transformation was unaffected by the PMMA or BN content. However, the microstructure shows that the residual porosity increased with increasing PMMA and BN content. In addition, the flexural strength and the dielectric constant decrease with addition of PMMA and BN due to the residual porosity. This article provides empirical study of design parameters for $Si_3N_4$-based radome materials.
Keywords
$Si_3N_4$; Radome; Dielectric Properties; Flexural Strength;
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