Authors: Fei He Chao Sui Xiaodong He Mingwei Li
Publish Date: 2015/05/23
Volume: 76, Issue: 1, Pages: 1-10
Abstract
Preoxidation process and modification with silane coupling agent SCA of original Al–Si alloy particles were selected to synthesize inorganic microencapsulated core/shell Al–Si alloy microparticles based on the sol–gel technology respectively The microstructure and phase change characteristic were measured and investigated by means of Fourier transform infrared spectra Xray diffraction scanning electron microscopy thermogravimetry and differential scanning calorimeter These two methods can both realize the microencapsulation and form stable dense αAl2O3 shell It is speculated that the microencapsulated reason is mainly attributed to the change in surface electric behaviors of Al–Si alloy particles according to the results of zeta potential measure The latent heats are 41692 and 30721 kJ/kg for specimens treated by preoxidation and the modification of SCA respectively The latter renders thicker and more uniform shell layer
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