Effects of random chopped short carbon fibers on microstructure and mechanical properties of joints for C_f/SiC composites by reaction bonding process

Abstract

Random chopped short carbon fibers (C_sf)/phenol-formaldehyde resin (PF)/SiC powder mixtures are used as filler for the joining of C_f/SiC composites to obtain SiC interlayer at the joining region. The influences of C_sf on the microstructure and mechanical properties have been investigated. Research shows that the introduction of C_sf can improve the microstructure uniformity of the joint and reduce residual silicon content in the interlayer. The joint achieve a high flexural strength of 232 ± 33 MPa as the carbon fiber content is 30 wt.%, which is similar to that of the C_f/SiC composites (220 ± 21 MPa). The decrease in residual silicon content and the formation of nano-sized SiC particles are the main reasons for high joining strength.

Keywords:

• Cf/SiC
• reaction bonding
• joining
• random chopped short carbon fibers

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by Natural Science Foundation of Shanghai (No. 16ZR1440900), and Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology.