本文采用化学沉积的方法 ,在板状基体上成功的制备纳米晶Co Fe P合金涂层。运用TEM、XRD等分析手段对 [Fe2 + ]对Co Fe P合金成分、结构、性能的影响进行分析研究。结果表明合适工艺参数的调整选择 ,可获得表面光亮致密与基体结合良好...本文采用化学沉积的方法 ,在板状基体上成功的制备纳米晶Co Fe P合金涂层。运用TEM、XRD等分析手段对 [Fe2 + ]对Co Fe P合金成分、结构、性能的影响进行分析研究。结果表明合适工艺参数的调整选择 ,可获得表面光亮致密与基体结合良好的纳米晶Co Fe P化学沉积膜 ,且所得纳米晶Co Fe P合金具有较低的矫顽力和较高的矩形比 。展开更多
Electroless Co-Fe-P alloys were deposited from an alkaline bath, containing boric acid as a buffer agent and sodium citrate as a complexing agent. As a result, with the increase of pH of the bath, the iron content of ...Electroless Co-Fe-P alloys were deposited from an alkaline bath, containing boric acid as a buffer agent and sodium citrate as a complexing agent. As a result, with the increase of pH of the bath, the iron content of the deposit increased, whereas the cobalt and phosphorus contents decreased. The structure of the deposit was investigated using X-ray diffraction （XRD） and transmission electron microscope （TEM）. The deposit consisted of hexahedron phase Co, cubic phase Fe-Co, and amorphous phase （crystalline）. The magnetic performances of the deposit were studied using vibrating sample magnetometer （VSM）. The more the content of Fe and the less the content of P （the content of Co being less）, the better the magnetic performances of the deposit. The Co-Fe-P deposit was suitable for use as soft magnetic material.展开更多
Cr_2O_3-forming ferritic stainless steels have been widely explored as intermediate temperature solid oxide fuel cells(SOFCs) interconnects.However,the evaporation of chromia scale might migrate to and poison the cath...Cr_2O_3-forming ferritic stainless steels have been widely explored as intermediate temperature solid oxide fuel cells(SOFCs) interconnects.However,the evaporation of chromia scale might migrate to and poison the cathode,leading to degradation of the cell performance.In this study,Ni-Co-Fe-P coatings were deposited on the ferritic stainless steel by means of a cost-effective technique of electroless method.They are expected to be converted into(Ni,Co,Fe)_3O_4 spinel with a high electrical conductivity and CTE match with stainless steel,which can block the evaporation of chromia formed on steel substrate exposed to the cathode environment of the SOFC. The effects of pH,mass ratio of FeSO_4/(FeSO_4 + NiSO_4 + CoSO_4) and temperature of solution on the deposition rate,compositions,surface morphologies and structures of the Ni-Co-Fe-P coatings were investigated.The results indicated that the deposition rate increased with increasing pH when pH was lower than 9 and then reduced when pH was higher than 9.The deposition rate increased with increasing temperature when temperature was lower than 80℃and then decreased when temperature was higher than 80℃.The deposition rate decreased with the increase in mass ratio of FeSO_4/(NiSO_4 + CoSO_4 + FeSO_4).The coatings consisted of Ni,Co,Fe and P.The phase structure of the coating was amorphous.展开更多
The thermal stability of nanocrystalline Ni-Co-Fe-P coatings with phosphorus content up to 3.38 wt% prepared by pulsed electrodepostion was studied using XRD, TEM and DSC. It is found that multi-component alloying doe...The thermal stability of nanocrystalline Ni-Co-Fe-P coatings with phosphorus content up to 3.38 wt% prepared by pulsed electrodepostion was studied using XRD, TEM and DSC. It is found that multi-component alloying does improve the thermal stability of nanocrystalline coatings due to a “solution drag effect”. For nanocrystalline Ni-40.41%Co-6.16%Fe-1.63%P coating, P-atoms segregate the grain boundaries during annealing which leads to a higher thermal stability. While due to the higher initial P-concentration in Ni-30.1%Co-2.15%Fe-3.38%P, saturation of P and precipitation occurs earlier leading to a slightly lower stability.展开更多
文摘本文采用化学沉积的方法 ,在板状基体上成功的制备纳米晶Co Fe P合金涂层。运用TEM、XRD等分析手段对 [Fe2 + ]对Co Fe P合金成分、结构、性能的影响进行分析研究。结果表明合适工艺参数的调整选择 ,可获得表面光亮致密与基体结合良好的纳米晶Co Fe P化学沉积膜 ,且所得纳米晶Co Fe P合金具有较低的矫顽力和较高的矩形比 。
基金Acknowledgements-This work was supported by the Fujian Provincial Natural Science Foundation of China （No. E0210020）.
文摘Electroless Co-Fe-P alloys were deposited from an alkaline bath, containing boric acid as a buffer agent and sodium citrate as a complexing agent. As a result, with the increase of pH of the bath, the iron content of the deposit increased, whereas the cobalt and phosphorus contents decreased. The structure of the deposit was investigated using X-ray diffraction （XRD） and transmission electron microscope （TEM）. The deposit consisted of hexahedron phase Co, cubic phase Fe-Co, and amorphous phase （crystalline）. The magnetic performances of the deposit were studied using vibrating sample magnetometer （VSM）. The more the content of Fe and the less the content of P （the content of Co being less）, the better the magnetic performances of the deposit. The Co-Fe-P deposit was suitable for use as soft magnetic material.
文摘Cr_2O_3-forming ferritic stainless steels have been widely explored as intermediate temperature solid oxide fuel cells(SOFCs) interconnects.However,the evaporation of chromia scale might migrate to and poison the cathode,leading to degradation of the cell performance.In this study,Ni-Co-Fe-P coatings were deposited on the ferritic stainless steel by means of a cost-effective technique of electroless method.They are expected to be converted into(Ni,Co,Fe)_3O_4 spinel with a high electrical conductivity and CTE match with stainless steel,which can block the evaporation of chromia formed on steel substrate exposed to the cathode environment of the SOFC. The effects of pH,mass ratio of FeSO_4/(FeSO_4 + NiSO_4 + CoSO_4) and temperature of solution on the deposition rate,compositions,surface morphologies and structures of the Ni-Co-Fe-P coatings were investigated.The results indicated that the deposition rate increased with increasing pH when pH was lower than 9 and then reduced when pH was higher than 9.The deposition rate increased with increasing temperature when temperature was lower than 80℃and then decreased when temperature was higher than 80℃.The deposition rate decreased with the increase in mass ratio of FeSO_4/(NiSO_4 + CoSO_4 + FeSO_4).The coatings consisted of Ni,Co,Fe and P.The phase structure of the coating was amorphous.
文摘The thermal stability of nanocrystalline Ni-Co-Fe-P coatings with phosphorus content up to 3.38 wt% prepared by pulsed electrodepostion was studied using XRD, TEM and DSC. It is found that multi-component alloying does improve the thermal stability of nanocrystalline coatings due to a “solution drag effect”. For nanocrystalline Ni-40.41%Co-6.16%Fe-1.63%P coating, P-atoms segregate the grain boundaries during annealing which leads to a higher thermal stability. While due to the higher initial P-concentration in Ni-30.1%Co-2.15%Fe-3.38%P, saturation of P and precipitation occurs earlier leading to a slightly lower stability.
