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Study on the microstructure and properties of Nb/Nb5Si3 composites strengthened with CNTs by Spark Plasma Sintering
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College of Materials Science Engineering,Nanchang Hangkong University,College of Materials Science Engineering,Nanchang Hangkong University,Department of Mechanical Engineering,ShangRao Vocational Technical College

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    Abstract:

    The Nb/Nb5Si3 In-Situ composite material strengthened with CNTs were prepared by Spark Plasma Sintering (SPS). The effects of CNTs content on microstructure and properties of Nb/Nb5Si3 in situ composites were investigated. The results show that the composite consists of Nb, α- Nb5Si3, and γ- Nb5Si3 phase. When adding over 2wt% CNTs, the new phase Nb4C3 was formed in the composites. The compressive strength and fracture toughness of composites increase obviously with increasing addition of CNTs. When the addition of CNTs is the 2wt%, the compressive strength and fracture toughness reached the maximum value and increased about 56%, 31% respectively. When the CNTs content added over 2wt%, the compressive strength fracture toughness decreased. The micrographs observed by SEM of fractography show the fracture appearance of the composites belongs to brittle cleavage fracture and partial intercrystalline fracture. The toughening mechanisms of composites are mainly due to the CNTs pullout and bridging.

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[Long Wenyuan, Chen Benlong, Shen Xianjun. Study on the microstructure and properties of Nb/Nb5Si3 composites strengthened with CNTs by Spark Plasma Sintering[J]. Rare Metal Materials and Engineering,2018,47(7):2240~2244.]
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History
  • Received:June 12,2016
  • Revised:July 23,2016
  • Adopted:September 14,2016
  • Online: October 10,2018
  • Published: