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首页> 外文期刊>Materials & design >High volume fraction Si particle-reinforced aluminium matrix composites fabricated by a filtration squeeze casting route
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High volume fraction Si particle-reinforced aluminium matrix composites fabricated by a filtration squeeze casting route

机译：通过过滤挤压铸造工艺制备的高体积分数硅颗粒增强铝基复合材料

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摘要

A new method called filtration squeeze casting (FSC) was presented to fabricate high volume fraction Si particle-reinforced aluminium matrix composites (Si_p/Al) for electronic packaging applications. The Si_p/Al composites exhibited a CTE of ～ 8.70 ppm/K, a TC above 119.80 W/( m · K) and a density of ～ 2.47 g/cm~3 as well as a flexural strength above 163 MPa. Fracture of large Si particles occurred during FSC, resulting in a decreased size of Si particles and hence an increased mechanical property and a decreased TC. The average size of Si particles of ～29 μm is much smaller than that of the conventional hypereutectic Al-Si alloy but slightly larger than that of Sip/Al composites fabricated by spray deposition, resulting in balanced mechanical and physical properties. Dilution treatment decreased the amount of eutectic silicon in the matrix, leading to a considerable increase in TC and a negligible decrease in flexural strength and hardness. The flexural fracture mode is as follows. First, when the load borne by a silicon particle is beyond its fracture strength, it breaks. Then, the cracks caused by the fracture of Si particles propagate along interfaces between silicon particles and matrix Al. Finally, the link of these cracks result in the failure.
机译：提出了一种称为过滤挤压铸造（FSC）的新方法，以制造用于电子包装应用的高体积分数的硅颗粒增强铝基复合材料（Si_p / Al）。 Si_p / Al复合材料的CTE约为8.70 ppm / K，TC高于119.80 W /（m·K），密度约为2.47 g / cm〜3，抗弯强度高于163 MPa。在FSC期间会发生大的Si颗粒断裂，导致Si颗粒尺寸减小，因此机械性能增强，TC降低。 〜29μm的Si粒子的平均尺寸比常规的过共晶Al-Si合金小得多，但比通过喷涂沉积法制备的Sip / Al复合材料的平均尺寸大一些，从而实现了机械和物理性能的平衡。稀释处理减少了基体中共晶硅的含量，导致TC的显着增加，而抗弯强度和硬度的降低可忽略不计。弯曲断裂模式如下。首先，当硅颗粒承受的载荷超过其断裂强度时，它就会断裂。然后，由Si颗粒的断裂引起的裂纹沿着硅颗粒与Al基体之间的界面传播。最后，这些裂缝的联系导致了失败。

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