Influence of annealing conditions on the formation of hollow Al2O3 microspheres studied by in situ ESEM

被引：16

作者：

Pedraza, F. ^{[1
]}

Podor, R. ^{[2
]}

机构：

[1] Univ La Rochelle UMR 7356 CNRS, LaSIE, Pole Sci & Technol, Ave Michel Crepeau, F-17042 La Rochelle 1, France

[2] UMR 5257 CEA CNRS UM2 ENSCM, Inst Chim Separat Marcoule, Site Marcoule,BP 17171, F-30207 Bagnols Sur Ceze, France

来源：

MATERIALS CHARACTERIZATION | 2016年 / 113卷

关键词：

Aluminium microparticles; Annealing; Oxidation; Coating; Electron microscopy; LOW-TEMPERATURE OXIDATION; ALUMINUM PARTICLES; THERMAL-PROPERTIES; MECHANISM; SHELL; SLURRY; CORE; SIZE; BEHAVIOR; NICKEL;

D O I：

10.1016/j.matchar.2016.01.018

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The transformation of Al microparticles into hollow and broken Al2O3 microspheres was investigated by in situ environmental scanning electron microscopy (ESEM) up to 1150 degrees C under different heating rates and 120 Pa of gas atmospheres. Slow heating rates (2 degrees C min(-1)) resulted in a better coverage of the particles shell than with fast heating rates (20 degrees C min(-1)) that delayed the threshold temperature at which the particles opened. Above this threshold, the amount of opened spheres increased with heating rate, with the coarser particles opening more than the small ones. It appeared that inert atmospheres (He-4%H-2) increased the temperature at which the particles transformed, while air and pure oxygen tended to lower it. In contrast, the temperature interval was larger and was size-dependent when using water vapour. Irrespective of the gas atmosphere, opening of the spheres allowed molten Al to flow out from the core and aluminise the substrate while leaving behind a top coat of hollow alumina spheres. (C) 2016 Elsevier Inc. All rights reserved.

引用

页码：198 / 206

页数：9

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