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On the mechanical, thermophysical and dielectric properties of Nextel™ 440 fiber reinforced nitride matrix (N440/Nitride) composites

The Nextel™ 440 fiber reinforced nitride matrix (N440/Nitride) composites were fabricated by precursor infiltration and pyrolysis (PIP) route. The results demonstrated that the original N440 fiber had a phase composition of amorphous SiO2 and ?-Al2O3. Its single filament tensile strength was 3.03GPa (at room temperature), while it dropped to 72.6% and 35.1% at 1200°C and 1400°C, respectively. The phase content of N440/Ntride composites was mainly ?-Al2O3 and amorphous BN, as well as mullite phase (formed at > 1100°C). The composites owned a flexural strength up to 76.0MPa at room temperature. The stair-stepping decrease in the load-displacement curve and fiber pull-outs in the fracture surface indicated a good fiber/matrix interface and toughness. By heating at 1400°C, the composites still possessed 67.4% of original bending strength. It was found that the high temperatures caused strong fiber-matrix bonding and severe fiber degradation. The specific heat, CTE and thermal conductivity of the composites were 0.325–0.586Jg?1 K?1, (3.2–4.0) × 10?6 K?1 and 0.78–3.47Wm?1 K?1, respectively. The composites possessed a dielectric constant of 4.25–4.35 and loss tangent of 0.004–0.01 at 8–12GHz. The good overall performances enabled the N440/Nitride composites advanced high-temperature wave-transparent applications.

» Author: Duan Li, Bin Li, Yuanyi Zheng, Shitao Gao, Xuejin Yang

» Reference: Ceramics International, Volume 44, Issue 6

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