Browse > Article
http://dx.doi.org/10.4191/kcers.2014.51.5.386

Flexural Strength and Dielectric Properties of in-situ Si3N4-SiO2-BN Composite Ceramics  

Lee, Hyun Min (Korea Advanced Institute of Science and Technology (KAIST))
Lee, Seung Jun (Agency for Defense Development (ADD))
Baek, Seungsu (Agency for Defense Development (ADD))
Kim, Do Kyung (Korea Advanced Institute of Science and Technology (KAIST))
Publication Information
Journal of the Korean Ceramic Society / v.51, no.5, 2014 , pp. 386-391 More about this Journal
Abstract
Silicon nitride ($Si_3N_4$) is regarded as one of the most promising materials for high temperature structural applications due to its excellent mechanical properties at both room and elevated temperatures. However, one high-temperature $Si_3N_4$ material intended for use in radomes has a relatively high dielectric constant of 7.9 - 8.2 at 8 - 10 GHz. In order to reduce the dielectric constant of the $Si_3N_4$, an in-situ reaction process was used to fabricate $Si_3N_4-SiO_2$-BN composites. In the present study, an in-situ reaction between $B_2O_3$ and $Si_3N_4$, with or without addition of BN in the starting powder mixture, was used to form the composite. The in-situ reaction process resulted in the uniform distribution of the constituents making up the composite ceramic, and resulted in good flexural strength and dielectric constant. The composite was produced by pressure-less sintering and hot-pressing at $1650^{\circ}C$ in a nitrogen atmosphere. Microstructure, flexural strength, and dielectric properties of the composites were evaluated with respect to their compositions and sintering processes. The highest flexural strength (193 MPa) and lowest dielectric constant (5.4) was obtained for the hot-pressed composites. The strength of these $Si_3N_4-SiO_2$-BN composites decreased with increasing BN content.
Keywords
$Si_3N_4$; Porous ceramic; In-situ reaction; Dielectric property;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 J. D. Walton and J. R. Radome Engineering Handbook: Design and Principle; pp.229-338, Inorganic Radomes, New York, 1970.
2 J. D. Walton: in Proc. of the Second International Conference on Electromagnetic Windows, Paris, France, 1971.
3 J. D. Walton, "Reaction Sintered Silicon Nitride for High Temperature Radome Applications," Am. Ceram. Soc. Bull., 53 [3], 255-58 (1974).
4 J. Barta, M. Manela, and R. Fischer, "$Si_3N_4$ and $Si_2N_2O$ for High Performance Radomes," Mater. Sci. Eng., 71, 265-72 (1984).
5 S. -H. Lee, C. -R. Cho, Y. -J. Park, J. -W. Ko, H. -D. Kim, H. -T. Lin, and P. Becher, "Densification of Reaction Bonded Silicon Nitride with the Addition of Fine Si Powder-Effects on the Sinterability and Mechanical Properties," J. Kor. Ceram. Soc., 50 [3], 218-25 (2013).   과학기술학회마을   DOI
6 J.-F. Yang, Z. -Y. Deng, and T. Ohji, "Fabrication and Characterization of Porous Silicon Nitride Ceramics Using $Yb_2O_3$ as Sintering Additive," J. Eur. Ceram. Soc., 23 [2], 371-78 (2003).   DOI
7 X. Li, L. Zhang, and X. Yin, "Fabrication and Properties of Porous $Si_3N_4$ Ceramic with High Porosity," J. Mater. Sci. Technol., 28 [12], 1151-56 (2012).   DOI
8 S. Shan, Q. Jia, Y. Wang, and J. Peng, "Fabrication of High-Porosity Silicon Nitride Ceramics with Excellent Mechanical Properties," Adv. Mater. Res., 284, 1339-42 (2011).
9 L. Yuan, J. -K. Yu, and S. -W. Zhang, "Fabrication of Porous Reaction-Bonded $Si_3N_4$-SiC Composites," Adv. Mater. Res., 391, 575-79 (2012).
10 M. K. Park, H. N. Kim, K, S. Lee, S. S. Back, E. S. Kang, Y. K. Baek, and D. K. Kim, "Effect of Microstructure on Dielectric Properties of $Si_3N_4$ at Microwave Frequency," Key Eng. Mater., 287, 247-52 (2005).   DOI
11 Y. -H. Seong, H. N. Kim, and D. K. Kim, "Dielectric Properties of ${\beta}$-SiAlON at High Temperature Using Perturbation Method," Key Eng. Mater., 403, 121-23 (2009).   DOI
12 Y. -H. Koh, H. W. Kim, and H. E. Kim, "Effect of Oxidation on Mechanical Properties of Fibrous Monolith $Si_3N_4$/BN at Elevated Temperatures in Air," J. Am. Ceram. Soc., 85 [12], 3123-23 (2002).
13 S. N. Karlsdottir and J. W. Halloran, "Role of Rare-Earch Oxide Additives on Mechanical Properties and Oxidation Behavior of $Si_3N_4$/BN Fibrous Monolith Ceramics," J. Am. Ceram. Soc., 89 [5], 1615-20 (2006).   DOI
14 X. Li, X. Yin, L. Zhang, L. Cheng, and Y. Qi, "Mechanical and Dielectric Properties of Porous $Si_3N_4-SiO_2$ Composite Ceramics," Mater. Sci. Eng. A, 500, 63-69 (2009).   DOI
15 S. Ding, Y. -P. Zeng, and D. Jiang, "Oxidation Bonding of Porous Silicon Nitride Ceramics with High Strength and Low Dielectric Constant," Mater. Lett., 61 [11-12], 2277-80 (2007).   DOI
16 G. -J. Zhang and T. Ohji, "Effect of BN Content on Elastic Modulus and Bending Strength of SiC-BN in Situ Composites," J. Mater. Res., 15 [9], 1876-80 (2000).
17 W. S. Coblenz and D. Lewis III, "In Situ Reaction of $B_20_3$ with AlN and/or $Si_3N_4$ to Form BN-toughened Composites," J. Am. Ceram. Soc., 71 [12], 1080-85 (1988).   DOI
18 G. -J. Zhang, J. F. Yang, and T. Ohji, "In situ $Si_3N_4$-SiC-BN Composites: Preparation, Microstructures and Properties," Mater. Sci. Eng. A, 328, 201-05 (2002).   DOI
19 G. -J. Zhang, J. F. Yang, M. Ando, and T. Ohji, "Nonoxideboron Nitride Composites: In Situ Synthesis, Microstructure and Properties," J. Eur. Ceram. Soc., 22, 2551-54 (2002).   DOI
20 G. -J. Zhang, Y. Beppu, T. Ohji, and S. Kanzaki, "Reaction Mechanism and Microstructure Development of Strain Tolerant In-situ SiC-BN Composites," Acta Mater., 49, 77-82 (2001).   DOI   ScienceOn
21 C. Boberski, H. Bestgen, and R. Hamminger, "Microstructural Development During Liquid-phase Sintering of $Si_3N_4$ Ceramics," J. Eur. Ceram. Soc., 9 [2], 95-99 (1992).   DOI
22 T. Honma and Y. Ukyo, "Sintering Process of $Si_3N_4$ with $Y_2O_3$ and $Al_2O_3$ as Sintering Additives," J. Mater. Sci. Lett., 18 [9], 735-37 (1999).   DOI
23 C. P. Gazzara and D. R. Messier, "Determination of Phase Content of $Si_3N_4$ by X-Ray Diffraction Analysis," Am. Ceram. Soc. Bull., 56 [9], 777-81 (1977).
24 B. Yuan, J. -X. Liu, G. -J. Zhang, Y. -M. Kan, and P. -L. Wang, "Silicon Nitride/Boron Nitride Ceramic Composites Fabricated by Reactive Pressureles Sintering," Ceram. Int., 35, 2155-59 (2009).   DOI
25 E. Ryshkewitch, "Compression Strength of Porous Sintered Alumina and Zirconia," J. Am. Ceram. Soc., 36, 65-68 (1953).   DOI