The corrosion of nickle superalloy by leaked zinc sulfide powders during hot pressing is the dominant factor which reduces the life time of the molds.In this work,the corrosion products were investigated by SEM and ED...The corrosion of nickle superalloy by leaked zinc sulfide powders during hot pressing is the dominant factor which reduces the life time of the molds.In this work,the corrosion products were investigated by SEM and EDS.The corrosion procedure was evaluated on the aspects of both thermodynamics and kinetics.The results indicate that the vapor pressure of the produced zinc gas and the system temperature influence the reaction equilibrium.The liquid nickel sulfide at high temperature accelerates the reaction by transporting nickel to zinc sulfide surface.This study suggests that the corrosion resistance of the superalloy molds can be promoted by decreasing the system temperature or increasing the zinc vapor pressure.展开更多
The aim of this work is to investigate the dependence of Zn S thin films structural and optical properties with the solution flow rate during the deposition using an ultrasonic spray method. The solution flow rate ran...The aim of this work is to investigate the dependence of Zn S thin films structural and optical properties with the solution flow rate during the deposition using an ultrasonic spray method. The solution flow rate ranged from 10 to 50 m L/h and the substrate temperature was maintained at 450 °C. The effect of the solution flow rate on the properties of Zn S thin films was investigated by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, optical transmittance spectroscopy（UV–V） and the four-point method. The X-ray diffraction analysis showed that the deposited material was pure zinc sulphide, it has a cubic sphalerite structure with preferential orientation along the（111） direction. The grain size values were calculated and found to be between 38 to 82 nm.SEM analysis revealed that the deposited thin films have good adherence to the substrate surfaces, are homogeneous and have high density. The average transmission of all films is up more than 65% in the range wavelength from 200 to 1100 nm and their band gap energy values were found between 3.5–3.92 e V. The obtained film thickness varies from 390 to 1040 nm. Moreover, the electric resistivity of the deposited films increases with the increasing of the solution flow rate between 3.51 × 10^5 and 11 × 10^5 Ω·cm.展开更多
基金supported by the National Youth Natural Science Foundation of China(51302284)
文摘The corrosion of nickle superalloy by leaked zinc sulfide powders during hot pressing is the dominant factor which reduces the life time of the molds.In this work,the corrosion products were investigated by SEM and EDS.The corrosion procedure was evaluated on the aspects of both thermodynamics and kinetics.The results indicate that the vapor pressure of the produced zinc gas and the system temperature influence the reaction equilibrium.The liquid nickel sulfide at high temperature accelerates the reaction by transporting nickel to zinc sulfide surface.This study suggests that the corrosion resistance of the superalloy molds can be promoted by decreasing the system temperature or increasing the zinc vapor pressure.
文摘The aim of this work is to investigate the dependence of Zn S thin films structural and optical properties with the solution flow rate during the deposition using an ultrasonic spray method. The solution flow rate ranged from 10 to 50 m L/h and the substrate temperature was maintained at 450 °C. The effect of the solution flow rate on the properties of Zn S thin films was investigated by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, optical transmittance spectroscopy（UV–V） and the four-point method. The X-ray diffraction analysis showed that the deposited material was pure zinc sulphide, it has a cubic sphalerite structure with preferential orientation along the（111） direction. The grain size values were calculated and found to be between 38 to 82 nm.SEM analysis revealed that the deposited thin films have good adherence to the substrate surfaces, are homogeneous and have high density. The average transmission of all films is up more than 65% in the range wavelength from 200 to 1100 nm and their band gap energy values were found between 3.5–3.92 e V. The obtained film thickness varies from 390 to 1040 nm. Moreover, the electric resistivity of the deposited films increases with the increasing of the solution flow rate between 3.51 × 10^5 and 11 × 10^5 Ω·cm.
