Further research on metallic materials for the super critical rotator and the main pipe line of a nuclear power station is very important for developing the nuclear power industry. In this study, the mathematical mode...Further research on metallic materials for the super critical rotator and the main pipe line of a nuclear power station is very important for developing the nuclear power industry. In this study, the mathematical model for 120 t large ingot was established, and the computer program ESR3D was developed to simulate the whole electro-slag re-melting (ESR) process. This includes the electrode melting, metallic droplet falling, metal pool forming, metal pool and slag pool rising and moving, installation of top crystallizer, ingot solidifying, etc. The simulated average melting rate of the electrode was in good agreement with that in practical production. The optimized parameters were used to produce 80-120 t large ingots, and the quality of the ingots satisfied the specifications of nuclear power and the super critical generating unit.展开更多
B_(2)O_(3)-Zn O-SiO_(2)(BZS)glass containing Cu O with excellent acid resistance,wetting properties,and high-temperature sintering density was prepared by high temperature melting method and then applied in copper ter...B_(2)O_(3)-Zn O-SiO_(2)(BZS)glass containing Cu O with excellent acid resistance,wetting properties,and high-temperature sintering density was prepared by high temperature melting method and then applied in copper terminal electrode for multilayer ceramic capacitors(MLCC)applications.The structure and property characterization of B_(2)O_(3)-Zn O-SiO_(2)glass,including X-ray diffraction,FTIR,scanning electron microscopy,high-temperature microscopy,and differential scanning calorimetry,indicated that the addition of CuO improved the glass’s acid resistance and glass-forming ability.The wettability and acid resistance of this glass were found to be excellent when CuO content was 1.50 wt%.Compared to BZS glass,the CuO-added glass exhibited excellent wettability to copper powder and corrosion resistance to the plating solution.The sintered copper electrode films prepared using the glass with CuO addition had better densification and lower sintering temperature of 750℃.Further analysis of the sintering mechanism reveals that the flowability and wettability of the glass significantly impact the sintering densification of the copper terminal electrodes.展开更多
In this paper the processes of melting and transfer of an electrode metal to the molten pool, hydrody- namics of molten pool in controlled pulsed arc welding in carbon dioxide have been investigated.The process of p...In this paper the processes of melting and transfer of an electrode metal to the molten pool, hydrody- namics of molten pool in controlled pulsed arc welding in carbon dioxide have been investigated.The process of pulsed arc welding with systematic short - circuits of the arc gap is realized by adaptive algo- rithms of pulsed control over main energetic parameters of welding - arc current and voltage,arc heated efficiency,peak,short - circuiting current, which provide the dosage of energy for energy for melting and transfer of every for of an electrode metal, the control over fluidity of the weld pool. Physica and mathematical models describing such processes in CO2, origind software hare been developed.The re- sults of physical simulation and mathemaical modelling permit to determine the influence of energetic parameters of the process on the condition of the 'power source-electrode-arc-molten pool' electrodynamic system at each moment of time.展开更多
The influence of microstructure homogeneity on the electrochemical performance for MmNi 3 5 Co 0 8 Mn 0 4 Al 0 3 alloy system was studied. It was found that technological parameters, such as tempe...The influence of microstructure homogeneity on the electrochemical performance for MmNi 3 5 Co 0 8 Mn 0 4 Al 0 3 alloy system was studied. It was found that technological parameters, such as temperature and refining time during alloy melting process have effects on the microstructure homogeneity and latter obviously influences the electrode performance, such as discharge potential plateau and cycle life of the alloys.展开更多
文摘Further research on metallic materials for the super critical rotator and the main pipe line of a nuclear power station is very important for developing the nuclear power industry. In this study, the mathematical model for 120 t large ingot was established, and the computer program ESR3D was developed to simulate the whole electro-slag re-melting (ESR) process. This includes the electrode melting, metallic droplet falling, metal pool forming, metal pool and slag pool rising and moving, installation of top crystallizer, ingot solidifying, etc. The simulated average melting rate of the electrode was in good agreement with that in practical production. The optimized parameters were used to produce 80-120 t large ingots, and the quality of the ingots satisfied the specifications of nuclear power and the super critical generating unit.
基金the National Natural Science Foundation of China(Nos.51372179,51772224)the Open Project Foundation of Guangdong Fenghua Advanced Technology(No.FHR-JS-202011024)。
文摘B_(2)O_(3)-Zn O-SiO_(2)(BZS)glass containing Cu O with excellent acid resistance,wetting properties,and high-temperature sintering density was prepared by high temperature melting method and then applied in copper terminal electrode for multilayer ceramic capacitors(MLCC)applications.The structure and property characterization of B_(2)O_(3)-Zn O-SiO_(2)glass,including X-ray diffraction,FTIR,scanning electron microscopy,high-temperature microscopy,and differential scanning calorimetry,indicated that the addition of CuO improved the glass’s acid resistance and glass-forming ability.The wettability and acid resistance of this glass were found to be excellent when CuO content was 1.50 wt%.Compared to BZS glass,the CuO-added glass exhibited excellent wettability to copper powder and corrosion resistance to the plating solution.The sintered copper electrode films prepared using the glass with CuO addition had better densification and lower sintering temperature of 750℃.Further analysis of the sintering mechanism reveals that the flowability and wettability of the glass significantly impact the sintering densification of the copper terminal electrodes.
文摘In this paper the processes of melting and transfer of an electrode metal to the molten pool, hydrody- namics of molten pool in controlled pulsed arc welding in carbon dioxide have been investigated.The process of pulsed arc welding with systematic short - circuits of the arc gap is realized by adaptive algo- rithms of pulsed control over main energetic parameters of welding - arc current and voltage,arc heated efficiency,peak,short - circuiting current, which provide the dosage of energy for energy for melting and transfer of every for of an electrode metal, the control over fluidity of the weld pool. Physica and mathematical models describing such processes in CO2, origind software hare been developed.The re- sults of physical simulation and mathemaical modelling permit to determine the influence of energetic parameters of the process on the condition of the 'power source-electrode-arc-molten pool' electrodynamic system at each moment of time.
文摘The influence of microstructure homogeneity on the electrochemical performance for MmNi 3 5 Co 0 8 Mn 0 4 Al 0 3 alloy system was studied. It was found that technological parameters, such as temperature and refining time during alloy melting process have effects on the microstructure homogeneity and latter obviously influences the electrode performance, such as discharge potential plateau and cycle life of the alloys.
