Crystallization Behavior of the Al-based Metal Glass Powders Sprayed by Low Temperature Supersonic Velocity Under Various Heat Flow Fields
WANG Xiaoming1, WEN Shu2, YANG Baijun3, HAN Guofeng1, ZHU Sheng1, LI Yuzhong4
1 National Key Laboratory for Remanufacturing, Army Academy of Armored Forces, Beijing 100072 2 School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105 3 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Science, Shenyang 110016 4 Yantai Demonstration Software Technology Co., Ltd.,Yantai 264000
Abstract: The Euler-Lagrange based numerical simulation and experimental tests were combined to achieve the three kinds of gas-solid two-phase flow fields, which referred to the Al-based metal glass powder-particles with propane-air, kerosene-oxygen and high temperature air. Meanwhile, the evolution law of the acceleration, temperature rise and crystallization of the powder induced by heat flow of gas field were expounded by the basic thermal physical property characterization of Al-based metal glass powder. It could be found from the results that various temperature fields produced by various heat flow fields were beneficial for accelerating the deposition of glass powders. The heat flow field of kerosene-oxygen would induce the sprayed particles to release harmful phases like Al2Y, and even cause melting and vaporization. The towing effect of the hot air flow could not eliminate the inherent brittleness of Al-based metal glass powders, blocking the way for the particles to form deposited layers with high plastic distortion. Fortunately, the heat flow effect of propane-air was able to adjust the Al-based metallic glass powder to the thermoplastic temperature range, and make full use of the high plasticity and low viscosity of the Al-based metal glass on its thermoplastic state, which can achieve high efficiency deposition as well as control crystallization transition. Consequently, propane-air was recognized as an ideal heat flow resource to achieve the deposition of Al-based metal glass with maximum original properties.
王晓明, 文舒, 杨柏俊, 韩国峰, 朱胜, 李宇中. 不同热流流场下低温超音速喷涂Al基金属玻璃粉体的晶化行为[J]. 材料导报, 2019, 33(22): 3795-3800.
WANG Xiaoming, WEN Shu, YANG Baijun, HAN Guofeng, ZHU Sheng, LI Yuzhong. Crystallization Behavior of the Al-based Metal Glass Powders Sprayed by Low Temperature Supersonic Velocity Under Various Heat Flow Fields. Materials Reports, 2019, 33(22): 3795-3800.
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2019, Vol. 33 
