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Carbon nanostructure-reinforced SiCw/Si3N4 composite with enhanced thermal conductivity and mechanical properties

机译：碳纳米结构增强SiCW / Si3N4复合材料，具有增强的导热性和机械性能

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Carbon nanostructures (CNS) as a kind of reinforcement material can remarkably enhance the mechanical and thermal properties of ceramics. This research presents an analysis of the influence of CNS on the thermal conductivity and mechanical properties of SiC _(w) /Si _(3) N _(4) composites. The SiC _(w) /Si _(3) N _(4) composites containing various types of CNS e.g. carbon nanofibers (CNF), multi-walled carbon nanotubes (MWCNT) and graphene nano-platelets (GNP) were fabricated by hot-press sintering. XRD analysis confirmed a complete transformation of α-Si _(3) N _(4) to β-Si _(3) N _(4) and microstructural analysis shows a uniform distribution, as well as a pullout and bridging mechanism of CNS. The results revealed that the thermal conductivity and mechanical properties of SiC _(w) /Si _(3) N _(4) composites increased with the addition of CNS. Maximum values of fracture toughness (9.70 ± 0.8 MPa m ~(1/2) ) and flexural strength (765 ± 58 MPa) have been achieved for the MWCNT-containing SiC _(w) /Si _(3) N _(4) composite, whereas the maximum values of Young's modulus (250 ± 3.8 GPa) and hardness (27.2 ± 0.9 GPa) have been achieved for the CNF-containing SiC _(w) /Si _(3) N _(4) composite. Moreover, thermal conductivity also improved with the addition of CNS and reached a maximum value of 110.6 W m ~(?1) K ~(?1) for the CNF-containing SiC _(w) /Si _(3) N _(4) composite. This work provides a useful approach for the fabrication of high-performance multifunctional composites for emerging engineering applications.
机译：作为一种增强材料的碳纳米结构（CNS）可以显着提高陶瓷的机械和热性能。该研究介绍了CNS对SiC _（W）/ Si _（3）N _（4）复合材料的导热性和机械性能的影响。 SiC _（w）/ si _（3）n _（4）含有各种类型的cns的复合材料。通过热压烧结制造碳纳米纤维（CNF），多壁碳纳米管（MWCNT）和石墨烯纳米血小板（GNP）。 XRD分析证实了α-Si_（3）N _（4）至β-Si _（3）N _（4）的完全变换，并且微结构分析显示了均匀的分布，以及CNS的拉出和桥接机制。结果表明，SiC _（W）/ Si _（3）N _（4）复合材料的热导率和机械性能随CNS的增加而增加。对于MWCNT的SiC _（W）/ Si _（3）N _（4，已经实现了骨折韧性的最大值（9.70±0.8MPa m〜（1/2））和弯曲强度（765±58MPa）（4） ）复合材料，而少量模量（250±3.8GPa）和硬度（27.2±0.9GPa）的最大值已经达到CNF的SiC _（W）/ Si _（3）N _（4）复合材料。此外，对于CNF的SiC _（W）/ Si_（3）N _（3）n _（ 4）复合材料。这项工作提供了一种用于制造高性能多功能复合材料的有用方法，用于新兴工程应用。

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