Properties Of Obtained Structures Research Articles

An investigation of CO2 conversion capacity for PCN series doped with different 3d ions (Fe2+, Co2+ and Cu2+)

Three porphyrinic Zr-MOFs (PCN-222, PCN-224 and PCN-226) doped with transition metals (Fe2+, Co2+ and Cu2+) are investigated for the potential application in carbon neutral, including the CO2 capture and conversion capacity as well as the stable cyclicity in the changeable environment. Based on the obtained structure properties, the adsorption quantities of CO2 and adsorption energies of the active sites (Fe2+, Co2+ and Cu2+) are calculated for the three PCN systems. As for the conversion capacity of these PCNs, the entire reduction pathway from CO2 to CH4 via an eight-electron transfer process is depicted by calculating the free energy (ΔG) and the energy barrier (ΔE), which can be modified by the different 3d ions doping. From the high separation efficiency of the products (CH4/CO2) and stability (thermostability in high temperature), the recyclability of these PCN is ultimately evaluated and found favorable for the industrial utilization. Therefore, the present work significantly supports that transition metals doping in different MOFs could yield the promising carbon capture and utilization (CCU) properties.

Effect of Austempering Time on Microstructure and Wear Resistance of Ductile Iron Castings

An experimental investigation was carried out to study the structure of ductile iron castings which were selected to perform the investigation: 1.4% Ni - 0.3 Mo and 2.4% Ni - 0.3 Mo. After austenitizing at 880℃ for 1.3 hr, the two alloys were austempered at 250An experimental investigation was carried out to study the structure of ductile iron castings which were selected to perform the investigation: 1.4% Ni - 0.3 Mo and 2.4% Ni - 0.3 Mo. After austenitizing at 880℃ for 1.3 hr, the two alloys were austempered at 250℃ and 350℃ for time intervals of 60, 120, 240 minutes. Microstructure observation and measurement of UTS, and adhesive wear resistances were reported as functions of austempering time. The results also showed that the obtained structure properties are not believed to be the best possible, but rather they should be viewed as what can be expected with reasonable controls. Production of a conventional spare gear from austempered ductile iron was aimed and concluded at a later stage. The same casting and treating conditions attributed to the optimum structure properties were used for production of the gear. and 350℃ for time intervals of 60, 120, 240 minutes. Microstructure observation and measurement of UTS, and adhesive wear resistances were reported as functions of austempering time. The results also showed that the obtained structure properties are not believed to be the best possible, but rather they should be viewed as what can be expected with reasonable controls. Production of a conventional spare gear from austempered ductile iron was aimed and concluded at a later stage. The same casting and treating conditions attributed to the optimum structure properties were used for production of the gear.