TY - JOUR
T1 - Carbon nanotubes as a unique agent to fabricate nanoceramic/metal composite powders for additive manufacturing
AU - Zhou, Weiwei
AU - Sun, Xiaohao
AU - Kikuchi, Keiko
AU - Nomura, Naoyuki
AU - Yoshimi, Kyosuke
AU - Kawasaki, Akira
N1 - Funding Information:
This work was partially supported by the New Energy and Industrial Technology Department Organization (NEDO) in Japan through the Energy and Environment New Technology Leading Program ( No. 14102987-0 ). The authors would like to thank Dr. Takamichi Miyazaki and Dr. Kosei Kobayashi for their sophisticated skill in TEM. Appendix A
Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2018/1/5
Y1 - 2018/1/5
N2 - 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.
AB - 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.
KW - Carbon nanotubes
KW - Dispersion
KW - Laser absorptivity
KW - Laser powder bed fusion
KW - Metal matrix composites (MMCs)
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U2 - 10.1016/j.matdes.2017.10.034
DO - 10.1016/j.matdes.2017.10.034
M3 - Article
AN - SCOPUS:85031784373
SN - 0264-1275
VL - 137
SP - 276
EP - 285
JO - Materials and Design
JF - Materials and Design
ER -