A powder metallurgy route to fabricate CNT-reinforced molybdenum-hafnium-carbon composites

An efficient powder metallurgy route including wet dispersion, high energy ball milling (HEBM) and spark plasma sintering (SPS) was proposed to fabricate carbon nanotube reinforced molybdenum‑hafnium‑carbon (CNT-reinforced MHC) composites. To improve the dispersion efficiency of carbon nanotubes (CN...

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Bibliographic Details
Published in:Materials & design 2020-06, Vol.191, p.108635, Article 108635
Main Authors: Wei, Yong, Luo, Lai-Ma, Liu, Huai-Bing, Zan, Xiang, Song, Jiu-Peng, Xu, Qiu, Zhu, Xiao-Yong, Wu, Yu-Cheng
Format: Article
Language:English
Subjects:
CNT-reinforced MHC composite
High energy ball milling
Mechanical properties
Microstructures
Spark plasma sintering
Wet dispersion
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Summary:An efficient powder metallurgy route including wet dispersion, high energy ball milling (HEBM) and spark plasma sintering (SPS) was proposed to fabricate carbon nanotube reinforced molybdenum‑hafnium‑carbon (CNT-reinforced MHC) composites. To improve the dispersion efficiency of carbon nanotubes (CNTs) in the molybdenum (Mo) matrix, acid treatment was used to de-agglomerate CNTs. Carbon nanotube/hafnium hydride (CNT/HfH2) powder prepared by wet dispersion and the powder subsequently milled with Mo through HEBM to fabricate MHC composite powder. The results show that this powder metallurgy process improved the dispersion uniformly of HfC and grain size. The strengthening mechanism of dispersion strengthening, grain refinement, lattice distortion and purification of free oxygen improved the relative density, microstructures and mechanical properties of the CNT-reinforced MHC composites. As a result, compared to other control groups and Mo based composites, the 30 h ball milling time of CNT-reinforced MHC composite (30 h composite) exhibits simultaneous enhancement in relative density, mechanical properties and improvement in microstructure. This work provides a feasible way to fabricate high-performance Mo matrix composites. [Display omitted] •An efficient powder metallurgy utilizing CNT was proposed to fabricate MHC composite.•This process improved the dispersion uniformity of HfC and grain size.•Simultaneous improvement in microstructure and mechanical properties were achieved in composite.
ISSN:0264-1275
1873-4197
DOI:10.1016/j.matdes.2020.108635