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

Yong Wei; Lai-Ma Luo; Huai-Bing Liu; Xiang Zan; Jiu-Peng Song; Qiu Xu; Xiao-Yong Zhu; Yu-Cheng Wu

Materials & Design (Jun 2020)

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

Yong Wei,
Lai-Ma Luo,
Huai-Bing Liu,
Xiang Zan,
Jiu-Peng Song,
Qiu Xu,
Xiao-Yong Zhu,
Yu-Cheng Wu

Affiliations

Yong Wei: Industry & Equipment Technology, Hefei University of Technology, Hefei 230009, China
Lai-Ma Luo: School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China; National–Local Joint Engineering Research Centre of Nonferrous Metals and Processing Technology, Hefei 230009, China; Corresponding authors at: School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China.
Huai-Bing Liu: School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
Xiang Zan: School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China; National–Local Joint Engineering Research Centre of Nonferrous Metals and Processing Technology, Hefei 230009, China
Jiu-Peng Song: China National R&D Center for Tungsten Technology, Xiamen Tungsten Co. Ltd, Xiamen 361026, China
Qiu Xu: Institute for Integrated Radiation and Nuclear Science, Kyoto University, Osaka-fu 590-0494, Japan
Xiao-Yong Zhu: School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China; National–Local Joint Engineering Research Centre of Nonferrous Metals and Processing Technology, Hefei 230009, China
Yu-Cheng Wu: School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China; National–Local Joint Engineering Research Centre of Nonferrous Metals and Processing Technology, Hefei 230009, China; Corresponding authors at: School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China.

Journal volume & issue: Vol. 191

Abstract

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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.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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