Preparation and characterization of core-shell Al@PFHP with improving the combustion and ignition properties of aluminum powder--颗粒学报PARTICUOLOGY

Zhang, L., Wang, S., Su, X., Li, X., & Zou, M. (2023). Preparation and characterization of core-shell Al@PFHP with improving the combustion and ignition properties of aluminum powder. Particuology, 77, 62-70. https://doi.org/10.1016/j.partic.2022.08.008

Preparation and characterization of core-shell Al@PFHP with improving the combustion and ignition properties of aluminum powder

Lichen Zhang, Shuo Wang, Xing Su, Xiaodong Li ^*, Meishuai Zou ^*

School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China

10.1016/j.partic.2022.08.008

Volume 77, June 2023, Pages 62-70

Received 13 March 2022, Revised 26 July 2022, Accepted 3 August 2022, Available online 24 August 2022, Version of Record 2 December 2022.

E-mail: bitlxd@bit.edu.cn; zoums@bit.edu.cn

Highlights

• PFHP was coated on the surface of aluminum powder to form Al@PFHP.

• Al@PFHP showed better thermal reaction and combustion performance, compared with Al.

• PFHP coating shell can improve the hydrophobicity and corrosion resistance of Al.

Abstract

The dense alumina shell on the surface of aluminum powder will hinder the combustion of aluminum powder and increase its ignition temperature. In this study, the aluminum oxide shell layer on the surface of aluminum powder was removed with hydrofluoric acid by one-pot method, and 3-Perfluorohexyl-1, 2-epoxypropane (PFHP) (F₃C(CF₂)₅CH₂C₂H₃O) was coated to form a uniform and controllable core-shell Al@PFHP. The core-shell Al@PFHP showed better thermal reaction and ignition performance. The exothermic enthalpy of Al@0.15 PFHP was increased by about 1.9 times, with lower ignition temperature (reduced by about 140 °C) and longer burning duration (increased by about 1.5 times) after coating with PFHP, compared with raw aluminum powder. In addition, the formation of PFHP coating shell can effectively improve the hydrophobicity and corrosion resistance of aluminum powder.

Graphical abstract

Keywords

Aluminum powder; Core-shell; 3-Perfluorohexyl-1; 2-Epoxypropane; Combustion

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