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首页> 外文期刊>Coatings >Preparation of MgAl2O4-Coated Al2O3np and Migration of Ceramic Nanoparticles during Ultrasonic Processing of Aluminum Matrix Composites
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Preparation of MgAl2O4-Coated Al2O3np and Migration of Ceramic Nanoparticles during Ultrasonic Processing of Aluminum Matrix Composites

机译：铝基复合材料超声处理期间MgAl2O4涂层Al2O3NP和陶瓷纳米粒子迁移的制备

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Composites reinforced by nano-ceramic particles typically result in the formation of clustering and a weak interface. The spatial distribution of particles and the wetting behavior remarkably affect the targeted properties. Here, a surface modification combined spatial control solution was demonstrated to prepare nanocomposites with homogeneous micro-structures. Poly-crystalline nano-MgAl2O4 particles that possess a good crystallographic orientation relationship with Al were coated on the surface of ceramic particles, and they were macro- and then microscopically dispersed in the melt by ultrasonic vibration with variable frequency. The reason this is that the acoustic pressure distributed in the Al melt can induce the acoustic streaming and cavitation. A model for calculating equilibrium particle migration velocity was proposed, based on which the distribution of particles could be controlled by adjusting the solidification rate and the size of particle clustering. The experimental results were validated by the prediction of the model. In addition, it was found that the relationship of the maximum radius angle with the contact angle was w0 = 180° - θ, and ultrasonic vibration could provide enough energy for the later stage entering of particles to overcome the energy barrier.
机译：由纳米陶瓷颗粒加固的复合材料通常导致聚类和弱界面的形成。颗粒的空间分布和润湿行为显着影响靶向性质。这里，对表面改性组合的空间控制溶液进行说明以制备具有均匀微结构的纳米复合材料。具有与Al具有良好晶体取向关系的聚结晶纳米MgAl2O4颗粒在陶瓷颗粒的表面上涂覆，并且它们通过具有可变频率的超声波振动进行微量分散在熔体中。原因这是在Al熔体中分布的声压可以诱导声学流和空化。提出了一种用于计算平衡颗粒迁移速度的模型，基于该模型，基于该模型，基于该模型可以通过调节凝固率和颗粒聚类的尺寸来控制颗粒的分布。通过预测模型来验证实验结果。另外，发现与接触角的最大半径角的关系是W0 = 180° - θ，并且超声波振动可以为后期进入颗粒来提供足够的能量以克服能量屏障。

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