Carbon nanotubes as a unique agent to fabricate nanoceramic/metal composite powders for additive manufacturing

Weiwei Zhou, Xiaohao Sun, Keiko Kikuchi, Naoyuki Nomura, Kyosuke Yoshimi, Akira Kawasaki

研究成果: Article査読

27 被引用数 (Scopus)

抄録

Laser powder bed fusion (PBF) offers many technological opportunities for producing high-performance composite parts with tailored structures. However, fabrication of suitable composite powders possessing homogenous dispersion, good flowability, suitable particle size and distribution is a prerequisite and main challenge currently faced. In this study, a novel strategy was developed to prepare nanoceramic/metal powders by using acid-treated carbon nanotubes (ATCNTs) as an agent. In detail, a 3 wt% ATCNT/Al2O3 colloid, in which the negatively-charged ATCNTs were partially covered with positively-charged Al2O3 nanoparticles under electrostatic attraction, was obtained by heteroagglomeration; subsequently, the uncovered surface areas of ATCNTs were intimately bonded to the positively-charged MoTiAl powders during their mixing. This ATCNT bridging made individual Al2O3 uniformly wrap on the surface of MoTiAl without aggregation. The Al2O3-coated MoTiAl powders remained similar in shape, particle size, and distribution to uncoated ones, simultaneously showing higher laser absorptivity due to an increased surface roughness. The PBF-processed Al2O3-ATCNT/MoTiAl composite was dense, in which Al2O3 nanoparticles were homogenously dispersed and intimately contacted with MoTiAl, giving rise to an increase in the hardness of the matrix.

本文言語English
ページ(範囲)276-285
ページ数10
ジャーナルMaterials and Design
137
DOI
出版ステータスPublished - 2018 1 5

ASJC Scopus subject areas

  • 材料科学(全般)
  • 材料力学
  • 機械工学

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