The microstructures and mechanics properties of TiC-based cermets composed of TiC, WC, Ni, Co, Mo, and Cr3C2 were investigated. The results show that Mo has a great effect on the sintering densification, microstructur...The microstructures and mechanics properties of TiC-based cermets composed of TiC, WC, Ni, Co, Mo, and Cr3C2 were investigated. The results show that Mo has a great effect on the sintering densification, microstructures, and mechanical properties. The microstructures and distribution of Mo and Ti in the TiC-based cermets were analyzed. It was indicated that a new phase with Ti, Mo, W, and C was formed on the rim of （Ti,W）C grains by means of an addition of Mo into the TiC-based cermets. The new phase with a surrounding structure was of great aid to improve the wettability of the liquid phase on the solid phase surface of TiC, decrease the porosity and refine the grains of the hard phase, which gave rise to the increase in strength and hardness. The properties of the TiC-based cermets could be further improved to some extent by adding WC, Cr2C3, and Co.展开更多
The dynamic control of the metasurface opens up a vital technological approach for the development of multifunctional integrated optical devices.The magnetic field manipulation has the advantages of sub-nanosecond ult...The dynamic control of the metasurface opens up a vital technological approach for the development of multifunctional integrated optical devices.The magnetic field manipulation has the advantages of sub-nanosecond ultra-fast response,non-contact,and continuous adjustment.Thus,the magnetically controllable metasurface has attracted significant attention in recent years.This study introduces the basic principles of the Faraday and Kerr effect of magneto-optical(MO)materials.It classifies the typical MO materials according to their properties.It also summarizes the physical mechanism of different MO metasurfaces that combine the MO effect with plasmonic or dielectric resonance.Besides,their applications in the nonreciprocal device and MO sensing are demonstrated.The future perspectives and challenges of the research on MO metasurfaces are discussed.展开更多
文摘The microstructures and mechanics properties of TiC-based cermets composed of TiC, WC, Ni, Co, Mo, and Cr3C2 were investigated. The results show that Mo has a great effect on the sintering densification, microstructures, and mechanical properties. The microstructures and distribution of Mo and Ti in the TiC-based cermets were analyzed. It was indicated that a new phase with Ti, Mo, W, and C was formed on the rim of （Ti,W）C grains by means of an addition of Mo into the TiC-based cermets. The new phase with a surrounding structure was of great aid to improve the wettability of the liquid phase on the solid phase surface of TiC, decrease the porosity and refine the grains of the hard phase, which gave rise to the increase in strength and hardness. The properties of the TiC-based cermets could be further improved to some extent by adding WC, Cr2C3, and Co.
基金the financial support from the National Key Research and Development Program of China(No.2017YFB1002900)Fok Ying-Tong Education Foundation of China(No.161009)+1 种基金the National Natural Science Foundation of China(Grant No.61775019)Beijing Outstanding Young Scientist Program(No.BJJWZYJH01201910007022).
文摘The dynamic control of the metasurface opens up a vital technological approach for the development of multifunctional integrated optical devices.The magnetic field manipulation has the advantages of sub-nanosecond ultra-fast response,non-contact,and continuous adjustment.Thus,the magnetically controllable metasurface has attracted significant attention in recent years.This study introduces the basic principles of the Faraday and Kerr effect of magneto-optical(MO)materials.It classifies the typical MO materials according to their properties.It also summarizes the physical mechanism of different MO metasurfaces that combine the MO effect with plasmonic or dielectric resonance.Besides,their applications in the nonreciprocal device and MO sensing are demonstrated.The future perspectives and challenges of the research on MO metasurfaces are discussed.
