钨灯丝扫描电子显微镜具有造价和运行成本低、样品适用性广的特点,在各研究机构的利用率很高,日常维护保养是保障其性能的必要手段.除了常规的扫描电子显微镜维护以外,因钨灯丝扫描电子显微镜结构特点,又有一些异于其它类型扫描电子显...钨灯丝扫描电子显微镜具有造价和运行成本低、样品适用性广的特点,在各研究机构的利用率很高,日常维护保养是保障其性能的必要手段.除了常规的扫描电子显微镜维护以外,因钨灯丝扫描电子显微镜结构特点,又有一些异于其它类型扫描电子显微镜的维护要点.以蔡司的EVO MA 15型钨灯丝扫描电子显微镜为例,从电子光学系统、真空系统、成像系统三个方面,阐述了钨灯丝扫描电子显微镜日常维护保养的具体办法,以供同行参考.展开更多
In this paper, a Ni-W-La2O3 composite coating was prepared by the electrodeposition method. Microhardness tester and environmental scanning electron microscope equipped energy dispersive spectroscopy were employed to ...In this paper, a Ni-W-La2O3 composite coating was prepared by the electrodeposition method. Microhardness tester and environmental scanning electron microscope equipped energy dispersive spectroscopy were employed to investigate the microhardness and the surface morphology of the composite coatings respectively, and the high temperature friction behavior and corrosion resistance of the coatings against molten glass were investigated by using a high temperature tribometer. The results show that La2O3 can refine the microstructure effectively, and make the element distribution uniform, which leads to the increase of average microhardness. La2O3 particulates can reduce the friction coefficient between the composite coating and glass during the sliding process at about 973 K largely, and the corrosion resistance of the La2O3 added Ni-W coatings is effectively improved compared with that of the non-added one, furthermore the mechanism of friction-reducing and anti-corrosion is also discussed.展开更多
文摘钨灯丝扫描电子显微镜具有造价和运行成本低、样品适用性广的特点,在各研究机构的利用率很高,日常维护保养是保障其性能的必要手段.除了常规的扫描电子显微镜维护以外,因钨灯丝扫描电子显微镜结构特点,又有一些异于其它类型扫描电子显微镜的维护要点.以蔡司的EVO MA 15型钨灯丝扫描电子显微镜为例,从电子光学系统、真空系统、成像系统三个方面,阐述了钨灯丝扫描电子显微镜日常维护保养的具体办法,以供同行参考.
基金Supported by the National Natural Science Foundation of China (Grant No. 50575121)
文摘In this paper, a Ni-W-La2O3 composite coating was prepared by the electrodeposition method. Microhardness tester and environmental scanning electron microscope equipped energy dispersive spectroscopy were employed to investigate the microhardness and the surface morphology of the composite coatings respectively, and the high temperature friction behavior and corrosion resistance of the coatings against molten glass were investigated by using a high temperature tribometer. The results show that La2O3 can refine the microstructure effectively, and make the element distribution uniform, which leads to the increase of average microhardness. La2O3 particulates can reduce the friction coefficient between the composite coating and glass during the sliding process at about 973 K largely, and the corrosion resistance of the La2O3 added Ni-W coatings is effectively improved compared with that of the non-added one, furthermore the mechanism of friction-reducing and anti-corrosion is also discussed.
