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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.59  No.12 (2018)  >  pp.1935-1942

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Microstructures of Carbon Fiber and Hybrid Carbon Fiber-Carbon Nanofiber Reinforced Aluminum Matrix Composites by Low Pressure Infiltration Process and Their Properties

Xuan Meng1, Yongbum Choi1, Kazuhiro Matsugi1, Zhefeng Xu1 and Wenchang Liu2
1Division of Materials and Production Engineering, Graduate School of Engineering, Higashi-Hiroshima 739-8527, Japan
2State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China

Carbon fiber reinforced pure Al, A336 alloy and carbon fiber-carbon nanofiber reinforced A336 alloy composites were successfully fabricated by low-pressure infiltration process, aiming for development the carbon fiber reinforced aluminum matrix composites with high thermal conductivity and mechanical property used as functional materials and structural materials, respectively. Carbon fiber of 10 vol% and hybrid carbon fiber-carbon nanofiber of 10 vol% were used to fabricated preforms for the low-pressure infiltration process. Afterwards, pure Al and Aluminum alloy under a temperature of 1073 K were infiltrated into the preforms under an applied pressure of 0.4 MPa in Ar environment. Microstructural and mechanical performances of the composites were investigated. Microstructure observations indicated that SiO2 binder was coated on the surface of carbon fiber and distributed at the corner of carbon fibers in carbon fiber preform. Carbon nanofibers were agglomerated at the corner of carbon fibers, and some were dispersed on the surface of carbon fiber in the hybrid preform. In composites, carbon fibers were homogeneously distributed in the matrix. Further Vickers hardness test results showed that the hardness of carbon fiber reinforced pure Al composite increased by 76% compared to pure Al, and carbon fiber reinforced A336 alloy composite increased by 11.1% compared to A336 alloy. The thermal conductivity (TC) test result illustrated that the thermal conductivity of carbon fiber reinforced pure Al and A336 alloy composite was 245.8 W/(m·K) and 113.5 W/(m·K), respectively, and the thermal conductivity of carbon fiber-carbon nanofiber reinforced A336 alloy composite was 98.4 W/(m·K).

aluminum matrix composites, hybrid reinforcement, low-pressure-infiltration, microstructure, mechanical properties

Received: May 16, 2018
Accepted: September 18, 2018 , Published online: November 25, 2018
The Japan Institute of Metals and Materials



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