电磁分离制备原位梯度材料

In-situ Functionally Gradient Materials Produced by Electromagnetic Separation Method

电磁分离制备原位梯度材料是利用初生相与熔体的导电性差异,在熔体凝固过程中通过施加电磁场控制初生相颗粒有规律的运动,从而获得初生相颗粒梯度分布的原位梯度材料的新技术。通过对成分的调整和工艺参数的控制,利用该方法可获得单层和多层颗粒增强的良好梯度材料;该方法适用范围较广,可选择多种合金系;而且该方法制备梯度材料具有工艺简单、成本低、制备周期短等优点。对电磁分离制备原位梯度材料的技术特点、颗粒在熔体中的运动、初生相颗粒和组织分布规律及其适用范围进行了简要的介绍。

Due to difference in the electric conductivity between the primary particles and the melt, the primary particles would move in the melt when they are exposed to the electromagnetic field. During solidification course of the melt under the electromagnetic field, in-situ functionally gradient materials can be produced by adjusting the particle migration rate （or intensity of the electromagnetic filed） and the melt cooling rate. Single and multi layers functionally gradient gaterials can be produced by adjusting alloy content and process parameters. Moreover this technique is effective for many kinds of alloy system. This technique also has the following advantages： simple process, low production cost, and high productive efficiency. This paper analyzed preparation characteristic on functionally gradient materials by electromagnetic separation method and migration velocity of primary particles, structure distribution, application field in detail.