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Homogeneous dispersion of boron nitride nanoplatelets in powder feedstocks for plasma spraying
Advanced Powder Technology ( IF 5.2 ) Pub Date : 2021-09-20 , DOI: 10.1016/j.apt.2021.09.017
Xiaolong Lu 1 , Cheng Zhang 2 , Arvind Agarwal 2 , Yao Chen 1, 3, 4
Affiliation  

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.



中文翻译:

氮化硼纳米片在等离子喷涂粉末原料中的均匀分散

六方氮化硼纳米片 (BNNP) 结合了优异的机械性能、高温热稳定性和自润滑性,是等离子喷涂复合涂层中很有前景的增强剂。然而,由于 BNNPs 的内在聚集,生产具有均匀分散的 BNNPs 的等离子喷涂原料是一项重大挑战。在本研究中,采用三种粉末制备工艺(静电相互作用、球磨和剪切混合)将 BNNPs 分散在 Ni-Cr-Cr 2 O 3 中(NCCO) 粉末。剪切混合过程在粉末制备中具有竞争优势,可提供稳定的剪切力并实现剥离的 BNNPs 在复合粉末中的均匀分布。最后利用喷雾干燥技术获得具有表面相对光滑和粒度分布均匀的球形团聚BNNP-NCCO原料。因此,剪切混合和喷雾干燥工艺有望生产出具有均匀分布的二维层状纳米材料的大规模球形复合粉末,用于工业应用。

更新日期:2021-10-27
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