制动盘用激光沉积混杂增强复合涂层的碳纳米管裂纹缝合机理研究

With the development of morden vehicle,much high speed and heavy load is its development direction. Ferrous matrix brake materials used in vehicle can not meet the high temperature demand on the brake disc surface of the morden vehicle, which hinders the development of the vehicle. By the use of the excellent high temperature properties of nickle matrix alloy, good wear resistance of SiC ceramic, nano-effect and low expansion of carbon nano tubes (CNTs), the CNTs /SiC/Ni hybrid composite coating with free crack can be obtained in virtue of CNTs sewing up crack in composite coating. Effect of laser beam on structure integrity of CNTs, mechanism of strengthening composite coating and effect of CNTs on residual stress of coating will be investigated in this project, which is favor to understanding the mechanism of sewing up crack in composite coating by CNTs. After finishing the project, the understand and control of the crack in laser deposited coating will be achieved, which is important to ivestigate the scientific problem and apply the laser surface strengthening technology.

载运工具的高速化和重载化已经成为现代交通工具发展的必然趋势，已有的铁基制动盘无法满足现代载运工具制动盘表层的瞬间高温性能，严重阻碍了载运工具的发展。本项目充分利用镍基高温合金优异的高温性能，SiC陶瓷的高耐磨性，同时应用碳纳米管的纳米效应和低膨胀性，双向消除复合涂层中的裂纹，实现碳纳米管对复合涂层的裂纹缝合，提出了运用激光沉积法制备制动盘用碳纳米管/SiC/Ni基高温合金混杂复合涂层。研究激光对复合粉末中碳纳米管结构完整性的作用机制，阐明碳纳米管对混杂复合涂层的强韧化机理，分析碳纳米管对涂层残余应力的影响，揭示碳纳米管对激光沉积混杂复合涂层的裂纹缝合机理。本项目的实施，将有助于进一步认识激光沉积复合涂层裂纹控制机理，为激光沉积零开裂复合涂层提供了新思路，对于科学问题的探索和加快我国激光表面强化技术应用具有重大的意义。

载运工具的高速化和重载化已经成为现代交通工具发展的必然趋势，已有的铁基制动盘无法满足现代载运工具制动盘表层的瞬间高温性能，严重阻碍了载运工具的发展。本项目充分利用镍基高温合金优异的高温性能，SiC陶瓷的高耐磨性，同时应用碳纳米管的纳米效应和低膨胀性，双向消除复合涂层中的裂纹，实现碳纳米管对复合涂层的裂纹缝合，提出了运用激光沉积法制备制动盘用碳纳米管/SiC/Ni基高温合金混杂复合涂层。研究激光对复合粉末中碳纳米管结构完整性的作用机制，阐明碳纳米管对混杂复合涂层的强韧化机理，分析碳纳米管对涂层残余应力的影响，揭示碳纳米管对激光沉积混杂复合涂层的裂纹缝合机理。本项目的实施，将有助于进一步认识激光沉积复合涂层裂纹控制机理，为激光沉积零开裂复合涂层提供了新思路，对于科学问题的探索和加快我国激光表面强化技术应用具有重大的意义。