The outermost coating with single phase Ni2Al3 was obtained on copper surface by electrodepositing nickel followed by slurry pack aluminizing at 800 °C for 12 h. The oxidation resistance and microstructure of the...The outermost coating with single phase Ni2Al3 was obtained on copper surface by electrodepositing nickel followed by slurry pack aluminizing at 800 °C for 12 h. The oxidation resistance and microstructure of the coating oxidized in ambient air at 1000 °C for 25-250 h were investigated using SEM, X-ray diffraction and optical microscope methods. The results show that the copper with single phase Ni2Al3 coating possesses the best high temperature oxidation resistance, and the mass gain of the coating is 1/15 that of pure copper and 1/2 that of nickel coating, respectively. The specimen surface after being oxidized for 25 h still comprises Ni2Al3 phase. However, when the time of oxidizing treatment increases to 50 h, the Ni Al phase is formed. It is also found that the Ni2Al3 phase completely turns into Ni Al phase after oxidizing treatment for 100 h and above. The Ni Al coating shows excellent high temperature oxidation resistance when oxidation time is 250 h.展开更多
To recycle arsenic from an As-Sb fly ash,a newly continuous reductive method for obtaining elemental As with additive of PbO was proposed.In the first reduction stage,PbO promoted the As segregation from the As-Sb fly...To recycle arsenic from an As-Sb fly ash,a newly continuous reductive method for obtaining elemental As with additive of PbO was proposed.In the first reduction stage,PbO promoted the As segregation from the As-Sb fly ash,due to which most As volatilized and Sb retained in roasted residues in phases of As-Sb-Pb-O and As-Sb-Pb alloy.With the increase of PbO and reductant amounts,the Sb fixation rate increased in the first reduction stage,and further the Sb content in the elemental As obtained from the second reduction stage decreased.After being roasted for 30 min at 550℃ with the addition of 20%activated carbon and 12%PbO in the first reduction stage,the As volatilization rate and Sb fixation rate from the As-Sb fly ash reached 92.86%and 79.38%,respectively.Then through the second reduction of the volatile matters at 650℃,the As and Sb contents in the obtained elemental As reached 99.07 wt%and 0.22 wt%respectively,indicating that the obtained As could be used to prepare high purity As,thereby rendering the As-Sb fly ash recycling.展开更多
he perovskite-type PbTiO3 has been synthesized by the method of mixed oxides. The appropriate conditions for preparing have been reported. The obtained PbTiO3 powder is pure and fine. The decolorization of dyes in a ...he perovskite-type PbTiO3 has been synthesized by the method of mixed oxides. The appropriate conditions for preparing have been reported. The obtained PbTiO3 powder is pure and fine. The decolorization of dyes in a PbTiO3 suspension system is over 90%. In this paper the photocatalytic ability of PbTiO3 and the factors of influence are discussed.展开更多
基金Projects(CKJB201205,QKJB201202,YJK201307)supported by the Nanjing Institute of Technology,China
文摘The outermost coating with single phase Ni2Al3 was obtained on copper surface by electrodepositing nickel followed by slurry pack aluminizing at 800 °C for 12 h. The oxidation resistance and microstructure of the coating oxidized in ambient air at 1000 °C for 25-250 h were investigated using SEM, X-ray diffraction and optical microscope methods. The results show that the copper with single phase Ni2Al3 coating possesses the best high temperature oxidation resistance, and the mass gain of the coating is 1/15 that of pure copper and 1/2 that of nickel coating, respectively. The specimen surface after being oxidized for 25 h still comprises Ni2Al3 phase. However, when the time of oxidizing treatment increases to 50 h, the Ni Al phase is formed. It is also found that the Ni2Al3 phase completely turns into Ni Al phase after oxidizing treatment for 100 h and above. The Ni Al coating shows excellent high temperature oxidation resistance when oxidation time is 250 h.
基金Project(51874153) supported by the National Natural Science Foundation of ChinaProject(LZB2021003) supported by Fundamental Research Funds for the Central UniversitiesDHU Distinguished Young Professor Program,China。
文摘To recycle arsenic from an As-Sb fly ash,a newly continuous reductive method for obtaining elemental As with additive of PbO was proposed.In the first reduction stage,PbO promoted the As segregation from the As-Sb fly ash,due to which most As volatilized and Sb retained in roasted residues in phases of As-Sb-Pb-O and As-Sb-Pb alloy.With the increase of PbO and reductant amounts,the Sb fixation rate increased in the first reduction stage,and further the Sb content in the elemental As obtained from the second reduction stage decreased.After being roasted for 30 min at 550℃ with the addition of 20%activated carbon and 12%PbO in the first reduction stage,the As volatilization rate and Sb fixation rate from the As-Sb fly ash reached 92.86%and 79.38%,respectively.Then through the second reduction of the volatile matters at 650℃,the As and Sb contents in the obtained elemental As reached 99.07 wt%and 0.22 wt%respectively,indicating that the obtained As could be used to prepare high purity As,thereby rendering the As-Sb fly ash recycling.
文摘he perovskite-type PbTiO3 has been synthesized by the method of mixed oxides. The appropriate conditions for preparing have been reported. The obtained PbTiO3 powder is pure and fine. The decolorization of dyes in a PbTiO3 suspension system is over 90%. In this paper the photocatalytic ability of PbTiO3 and the factors of influence are discussed.
