受电弓滑板用石墨-铜梯度复合材料的激光直接金属沉积机理及性能研究

The low strength of electricity contact board for the express train limits the high speed of the train. The graphite-Cu gradient composite used as electricity contact board in express was fabricated by laser direct metal deposition technology based on graphite powder and copper alloy powder in this project. Effect of the gradient distribution of reinforcement on cracks in composites during the fabrication, microstructure evolution and properties was studied, which is in favor of understand for the mechanism of laser direct metal deposition for gradient composite. The project help to catch the physical mechanism for laser direct metal deposition, which is the foundation of the application of gradient composite, laser fabrication technology and the express train in our country.

受电弓滑板材料的低强度严重阻碍了铁路高速化发展，本项目以石墨粉和锡青铜粉末为原料，通过激光直接金属沉积制备受电弓滑板用石墨-铜梯度复合材料，研究该过程中梯度复合材料增强体梯度分布对裂纹的作用机理，阐明沉积过程中多次重熔时梯度复合材料微观结构演化机制，分析梯度复合材料性能的变化规律，揭示受电弓滑板用石墨-铜梯度复合材料的激光直接金属沉积机理。本项目的顺利实施，将有助于进一步认识激光直接金属沉积梯度复合材料的物理机制，为梯度材料的应用及发展激光制造技术奠定坚实的理论基础，对于科学问题的探索和加快我国铁路高速化进程具有重大意义。

本受电弓滑板材料的低强度严重阻碍了铁路高速化发展，项目以石墨粉和锡青铜粉末为原料，通过激光直接金属沉积制备受电弓滑板用石墨-铜梯度复合材料，研究该过程中梯度复合材料增强体梯度分布对裂纹的作用机理，阐明沉积过程中多次重熔时梯度复合材料微观结构演化机制，分析梯度复合材料性能的变化规律，揭示受电弓滑板用石墨-铜梯度复合材料的激光直接金属沉积机理。本项目的顺利实施，将有助于进一步认识激光直接金属沉积梯度复合材料的物理机制，为梯度材料的应用及发展激光制造技术奠定坚实的理论基础，对于科学问题的探索和加快我国铁路高速化进程具有重大意义。