Homogeneous dispersion of boron nitride nanoplatelets in powder feedstocks for plasma spraying

Xiaolong Lu, Cheng Zhang, Arvind Agarwal, Yao Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Hexagonal Boron nitride nanoplatelet (BNNP) with the combination of excellent mechanical properties, high-temperature thermal stability, and self-lubrication is a promising strengthening agent in plasma-sprayed composite coatings. However, it is a significant challenge to produce plasma sprayable feedstocks with homogeneously dispersed BNNPs owing to the intrinsic agglomeration of BNNPs. In this research, three powder preparation processes (electrostatic interaction, ball milling, and shear mixing) were employed to disperse BNNPs in Ni-Cr-Cr2O3 (NCCO) powders. The shear mixing process presents a competitive advantage in powder preparation, providing stable shear force and achieving exfoliated BNNPs homogeneous distribution in the composite powders. The spray drying technique was finally utilized to obtain spherical agglomerated BNNP-NCCO feedstocks with characteristics of relatively smooth surface and uniform size distribution. Hence, shear mixing and spray drying processes are expected to produce large-scale spherical composite powders with a homogeneous distribution of 2D layered nanomaterials for industrial application.

Original languageEnglish
Pages (from-to)4167-4176
Number of pages10
JournalAdvanced Powder Technology
Volume32
Issue number11
DOIs
Publication statusPublished - Nov 2021
Externally publishedYes

Keywords

  • Ball milling
  • BN nanoplatelets
  • Electrostatic interaction
  • Shear mixing
  • Spray drying

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