In order to improve the tribological properties of ceramic composites, Al2O3/TiC-Al2O3/ TiC/CaF2 self-lubricating laminated ceramic composites were prepared by vacuum hot pressing sintering. Experiments were conducted...In order to improve the tribological properties of ceramic composites, Al2O3/TiC-Al2O3/ TiC/CaF2 self-lubricating laminated ceramic composites were prepared by vacuum hot pressing sintering. Experiments were conducted to get mechanical properties and the friction and wear properties were also measured with friction and wear tester. The worn surfaces were observed by scanning electron microscope (SEM) and energy dispersion spectrum (EDS). The wear resistance properties and the self-lubricating effect of ceramic composites were analyzed. Results show that the Al2O3/TiC-Al2O3/TiC/CaF2 self-lubricating laminated ceramic composites layers are well-defined with a higher bonding strength and the mechanical performances are uniform enough to overcome the anisotropy of weak laminated ceramic composites. In addition, the fracture toughness of Al2O3/TiC layers is also improved. Its friction coefficient and wear rates decrease with the increase of rotation speed and load. Al2O3/TiC-Al2O3/TiC/CaF2 self-lubricating laminated ceramic composites have good wear resistance because of the tribofilm formed by the CaF2 solid lubricants. The wear mechanisms of Al2O3/TiC/ CaF2 layers are abrasive wear and Al2O3/TiC layers are adhesive wear.展开更多
风力发电机组法兰连接的增速齿轮箱与主轴对中装配过程中,调整两个部件之间的对中精度是保证设备整体正常运行的技术要求之一。采用两套激光对中仪配合对中调整工装的使用,可以快速、精确地实现对增速齿轮箱 X 轴、Y 轴和 Z 轴 3 个方...风力发电机组法兰连接的增速齿轮箱与主轴对中装配过程中,调整两个部件之间的对中精度是保证设备整体正常运行的技术要求之一。采用两套激光对中仪配合对中调整工装的使用,可以快速、精确地实现对增速齿轮箱 X 轴、Y 轴和 Z 轴 3 个方向的调整,从而满足增速齿轮箱与主轴的对中精度要求,提高生产效率。同样,该方法也适用于其他大尺寸、重型法兰连接设备之间的对中调整。展开更多
基金Funded by the National Natural Science Foundation for Young Scholars of China(No.51005100)Higher Education Science and Technology Program of Shandong(No.J11LD14)Science and Technology Development Plan of Shandong(No.2012GGX10324)
文摘In order to improve the tribological properties of ceramic composites, Al2O3/TiC-Al2O3/ TiC/CaF2 self-lubricating laminated ceramic composites were prepared by vacuum hot pressing sintering. Experiments were conducted to get mechanical properties and the friction and wear properties were also measured with friction and wear tester. The worn surfaces were observed by scanning electron microscope (SEM) and energy dispersion spectrum (EDS). The wear resistance properties and the self-lubricating effect of ceramic composites were analyzed. Results show that the Al2O3/TiC-Al2O3/TiC/CaF2 self-lubricating laminated ceramic composites layers are well-defined with a higher bonding strength and the mechanical performances are uniform enough to overcome the anisotropy of weak laminated ceramic composites. In addition, the fracture toughness of Al2O3/TiC layers is also improved. Its friction coefficient and wear rates decrease with the increase of rotation speed and load. Al2O3/TiC-Al2O3/TiC/CaF2 self-lubricating laminated ceramic composites have good wear resistance because of the tribofilm formed by the CaF2 solid lubricants. The wear mechanisms of Al2O3/TiC/ CaF2 layers are abrasive wear and Al2O3/TiC layers are adhesive wear.
文摘风力发电机组法兰连接的增速齿轮箱与主轴对中装配过程中,调整两个部件之间的对中精度是保证设备整体正常运行的技术要求之一。采用两套激光对中仪配合对中调整工装的使用,可以快速、精确地实现对增速齿轮箱 X 轴、Y 轴和 Z 轴 3 个方向的调整,从而满足增速齿轮箱与主轴的对中精度要求,提高生产效率。同样,该方法也适用于其他大尺寸、重型法兰连接设备之间的对中调整。