Fabrication of Al2O3-reinforced Mo-based Composites by Laser Powder Bed Fusion
We have developed an innovative approach to fabricate nanoceramic/metal composite powders for laser powder bed fusion(L-PBF)by using carbon nanotubes(CNTs)as an agent during hetero-agglomeration.The negatively-charged acid-treated CNTs effectively bridged positively charged Al2O3 and MoTiAl powders utilizing electrostatic attraction.It made individual Al2O3 nanoparticles uniformly decorate the surface of MoTiAl without aggregation.The Al2O3-decorated MoTiAl powders remained similar in shape,particle size,and distribution to undecorated ones,simultaneously showing higher laser absorptivity due to an increased surface roughness.The L-PBF-processed Al2O3-CNT/MoTiAl composite was dense,where Al2O3 nanoparticles were homogenously dispersed and intimately contacted with MoTiAl,giving rise to an increase in the mechanical performance of the matrix.This work may offer significant guidance for designing and producing advanced Mo-based composites in the application of heat-resistant materials.
Mo-based alloys Laser powder bed fusion (L-PBF) Metal matrix composites (MMCs) Carbon nanotubes
Zhou Weiwei Sun Xiaohao Kikuchi Keiko Nomura Naoyuki Yoshimi Kyosuke Kawasaki Akira
Department of Materials Processing,Graduate School of Engineering,Tohoku University,Sendai 980-8579, Department of Material Science,Graduate School of Engineering,Tohoku University,Sendai,Miyagi 980-85
国际会议
北京
英文
1590-1594
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）