Fabrication and properties of borazine derived boron nitride bonded porous silicon aluminum oxynitride wave-transparent composite |
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Affiliation: | 1. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia;2. Bay Zoltan Nonprofit Ltd for Applied Research, Institute for Materials Science and Technology, Budapest, Hungary;1. Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials of Ministry of Education, Shandong University, Jinan 250061, P.R. China;2. Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, Shandong University, Jinan 250061, P.R. China;1. Key laboratory for Liquid–Solid Structural Evolution & Processing of Materials of Ministry of Education, Shandong University, Jingshi Road 17923, Jinan 250061, Shandong, China;2. Key laboratory of Special Functional Aggregated Materials, Ministry of Education, Shandong University, Jingshi Road 17923, Jinan 250061, Shandong, China |
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Abstract: | Boron nitride bonded porous silicon aluminum oxynitride composite was fabricated by gel-casting, precursor infiltration and pyrolysis process, and the composition, microstructure, mechanical and dialectical properties of the composite were characterized. The results show that the composite is comprised of β-SiAlON (z = 3) synthesized from mixed ceramic powders, and continuous h-BN pyrolyzed from borazine, with a relatively high porosity of 24.21%. The flexural strength, elastic modulus and fracture toughness of the composite are 178.58 MPa, 75.51 GPa and 4.54 MPa m1/2, respectively. The sintering shrinkage of SiAlON ceramics can be greatly decreased by the borazine infiltration and pyrolysis process. The existence of h-BN phase and the high porosity reduce the values of dielectric constant and loss tangent of the composite, which are 3.51–3.69 and 0.9–3.1 × 10−3 at the frequency from 7 to 18 GHz with the elevating temperature from 25 to 1200 °C. |
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Keywords: | SiAlON Boron nitride Composite materials Ceramics Dielectric properties |
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