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Fabrication and microstructure analysis of continuous C fibers reinforced SiC-Cnfs hybrid composite tubes
Materials and Manufacturing Processes ( IF 4.8 ) Pub Date : 2020-10-14 , DOI: 10.1080/10426914.2020.1832685
Shaik Mubina 1, 2 , M. Ilaiyaraja 1 , Asit Kumar Khanra 2 , Bhaskar Prasad Saha 1
Affiliation  

ABSTRACT The carbon nanofibers (Cnfs) dispersed SiC-Cnfs composite powder has been produced by spray freeze-granulation technique. SiC-based hybrid composite tubes (BN-Cf/SiC-Cnfs) were fabricated by systematically laying of boron nitride-coated continuous carbon fiber (BN-Cf) in the SiC-Cnfs composite matrix. High-density hybrid composite tubes were processed by cold isostatically pressing (CIP) of the afore-mentioned powder in a specially designed mold followed by pressureless sintering. The detailed processing techniques highlighting the criticality of each processing-step have been discussed. The implication of the processing techniques on the structure and properties of the composites were analyzed by using SEM, FTIR, and XRD, highlighting the matrix microstructure and the interfacial bonding of fiber with the matrix. In addition, the influence of newly evolved secondary-phases, Cnfs dispersion, long Cf reinforcement on optimization of properties of the hybrid composites was discussed in detail highlighting TEM analysis. The fractographic analysis of the hybrid composite tubes was carried out to understand the influence of long fibers on the improvement of fracture toughness of the nanofibers containing hybrid composite matrix. The fracture toughness and the other mechanical properties of the base matrix were found to improve significantly due to the combined contribution of specially laid long fibers in nanofibers containing matrix.

中文翻译:

连续C纤维增强SiC-Cnfs混合复合管的制备及微观结构分析

摘要 采用喷雾冷冻造粒技术制备了碳纳米纤维(Cnfs)分散的 SiC-Cnfs 复合粉末。通过在 SiC-Cnfs 复合材料基体中系统地铺设氮化硼涂层连续碳纤维 (BN-Cf),制备了 SiC 基混合复合管 (BN-Cf/SiC-Cnfs)。高密度混合复合管通过将上述粉末在专门设计的模具中冷等静压 (CIP) 和无压烧结进行加工。已经讨论了突出每个处理步骤的关键性的详细处理技术。通过使用 SEM、FTIR 和 XRD 分析了加工技术对复合材料结构和性能的影响,突出了基体微观结构和纤维与基体的界面结合。此外,详细讨论了新演化的第二相、Cnfs 分散、长 Cf 增强对混合复合材料性能优化的影响,重点讨论了 TEM 分析。进行了混合复合管的断口分析,以了解长纤维对提高含有混合复合基体的纳米纤维的断裂韧性的影响。由于特殊铺设的长纤维在包含基体的纳米纤维中的共同贡献,基础基体的断裂韧性和其他机械性能被发现显着提高。对混合复合管进行断口分析,以了解长纤维对提高含有混合复合基体的纳米纤维的断裂韧性的影响。由于特殊铺设的长纤维在包含基体的纳米纤维中的共同贡献,基础基体的断裂韧性和其他机械性能被发现显着提高。进行了混合复合管的断口分析,以了解长纤维对提高含有混合复合基体的纳米纤维的断裂韧性的影响。由于特殊铺设的长纤维在包含基体的纳米纤维中的共同贡献,基础基体的断裂韧性和其他机械性能被发现显着提高。
更新日期:2020-10-14
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