A novel Si3N4/BAS/BN composite synthesized by spark plasma sintering |
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Affiliation: | Faculty of Materials Science and Engineering, Department of Engineering, Imam Hossein University, Tehran, Iran |
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Abstract: | Based on good thermomechanical and electromagnetic properties of silicon nitride (Si3N4), barium aluminosilicate (BaO–BaTiO3–SiO2 or BAS), and boron nitride (BN), a novel combination of Si3N4/BAS/BN composites was fabricated by spark plasma sintering (SPS) after traditional powder mixing process. The effect of different amounts of BN (3–9 wt%) on the mechanical properties of composite was studied. The phases were observed by X-ray diffraction, and the microstructures were identified by scanning electron microscopy (SEM). The optimal sample is the one containing 3 wt% of BN and is sintered under a final pressure of 50 MPa. This sample has a hardness of 9.03 GPa, a flexural strength of 418.75 MPa, an elastic modulus of 934.46 MPa, and a loss tangent of less than 0.002 in 38% of the X-band frequencies. The optimal sample thickness was determined via the Nicolson-Ross-Weir (NRW) technique considering the mechanical strength limits. |
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Keywords: | Silicon nitride Boron nitride Spark plasma sintering Wave transparent composite Mechanical properties Dielectric Loss tangent |
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