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METASTABLE　PHASE　AND　AGE　HARDEning　IN　RAPIDLY－SOLIDIFIED　SILVER－RICH　Ag－Gd　ALLOYS

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中国有色金属学会会刊：英文版 1996年第4期6卷 138-143页

作者： ning yuantao(Institute of Precious Metals,Kunming 650221) INST PRECIOUS MET KUNMING 650221PEOPLES R CHINA

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关键词： metastable phase age hardening rapidly-solidified Ag-Gd alloy

Internal Oxidation of Some Pd-40Ag-1RE Alloys

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Rare Metals 1990年第1期10卷 30-33页

作者： ning, yuantao Li, Yongnian Dai, Hong Inst of Precious Metals China

The internal oxidation behavior of Pd-40Ag-1RE (RE = Sm, Eu, Gd, Y) alloy wires has been studied in air at 800 °C 1200°C. The dependence of internal oxidation depth ξ on reaction time t can be expressed as ξ = Ktn, the reaction index n = 0.50 approximately 0.75. The higher the oxidation temperature is, the larger the n value is. It means that the internal oxidation of wire sampls at high temperature deviates from parabola rule observed on plate sample. The activation energies of the studied alloys range over 120 approximately 160 kJ/mol. The internal oxidation process is controlled by the bulk diffusion of oxygen.

关键词： Metallography Phase Transitions Oxygen Diffusion Palladium and Alloys High Temperature Effects Rare Earth Elements Internal Oxidation

RECOVERY OF COLD DEFORMED HIGH PURE SILVER

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中国有色金属学会会刊：英文版 1996年第2期6卷 105-110页

作者： ning yuantao Wen Fei Zhao Huaizhi Deng Deguo (Institute of Precious Metals, Kunming 650221) INST PRECIOUS MET KUNMING 650221PEOPLES R CHINA

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关键词： silver recovery recrystallization

XRD STUDY OF RECOVERY PROCESS OF COLD DEFORMED Ag AND Ag-Ce ALLOY

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Acta Metallurgica Sinica(English Letters) 1996年第1期9卷 27-31页

作者： ning yuantao WENFei(Kunming Institute of Precious Metals Kunming 650221.China) Kunming Inst of Precious Metals Kunming China

The recovery processes of cold deformed Ag and Ag-Ce alloy containing trace cerium were studied by XRD *** on Scherrer formula and an analytical program,the lattice distortion and subgrain size for both Ag and Ag-Ce alloy were determined in the recovery *** cold deformed high purity Ag showed tow recrystallization temperature,obvious lattice relaxation and *** trace Ce solute is an effective inhibitor for recovery softening of high purity Ag since it raises the recrystallization temperature and restrains the lattice relaxation.

关键词： Ag Ag-Ce alloy recovery microalloying

METASTABLE EXTENSION OF SOLID SOLUBILITY OF RARE-EARTH ELEMENTS IN Al

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Acta Metallurgica Sinica(English Letters) 1992年第11期5卷 327-333页

作者： ning yuantao ZHOU Xinming DAI Hong Institute of Precious Metals,Kunming,Yunnan,China Inst of Precious Metals Kunming China

The splat folis of Al-RE(RE=Y,La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Er and Yb) binary alloys of 0.04—0.06 mm thickness were made by are-melting and hammer-anvil technique,*** rate is in 10~6 K/s order of *** metastable extended solid solubilities of these RE elements have been evaluated by measurements of the lattice spacings of the rapidly solidified(RS)Al-RE alloys,they are 0.4,0.15,0.21,0.21,0.3, 0.5,0.1,0.6,0.65,0.7,0.75,0.2 at.-% for above individual RE clements,*** secondary phase in RS Al-RE alloys were identified to be Al_4RE for alloys containing light RE and Eu elements and Al_3 RE for alloys containing heavy RE and Y elements. Some factors influencing the extension of solid solubility of Al-RE alloy were discussed.

关键词： rapid solidification solid solubility Al-RE alloys

MICROSTRUCTURE AND EXTENDED SOLID SOLUBILITY OF Tb IN RAPIDLY SOLIDIFIED Ag-Tb ALLOY

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Acta Metallurgica Sinica(English Letters) 1991年第8期4卷 143-146页

作者： ning yuantao ZHO U Xinming LI Yongnian Kunming Institute of Precious Metals,Kunming,China Kumming Inst of Precious Metals Kumming China

The 0,05—0.08 mm thick splat foils of Ag-Tb alloy,containing Tb up to 10 at.-%,were made by the hammer-anvil *** cooling rate was in order of 10~6 K/*** metastable extension of solid solubility of Tb in the alloy was measured to be up to 5 at.-% by lattice parameter *** secondary phase in metastable eutectic structure was identi- fied as Ag_3Tb from diffraction *** microstructure and micro-defect in as-quenched Ag-Tb splat foil were also observed.

关键词： rapid solidification Ag-Tb alloy solid solubility

INFLUENCE OF RARE-EARTH ELEMENTS ON THERMAL STABILITY OF PdSi_(16.5)GLASS

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Acta Metallurgica Sinica(English Letters) 1990年第7期3卷 43-48页

作者： ning yuantao LI Yongnian Kunming Institute of Precious Metals,China ning yuantao,Professor,Institute of Precious Metals,Kunming,Yunnan,China

The influence of rare-earth elements,La,Ce,Pr,Nd,Sm,Eu,Gd,Dy,Ho,Er and Yb on the thermal stability of PdSi_(16.5) glass was studied systematically by means of *** rare-earth elements,especially heavy ones,increase obviously the thermal stability parameters,including T_θ(T_g ,T_x ,T_g),T_(rg) and ΔE *** crystallization temperatures T_(p1) and T_(p2) increase linearly with the lanthanide constriction increasing,but Eu shows an anomalous influence:Pd-Si-Eu metallic glass possesses the highest thermal stability and the lowest concentration limit of glass forming among Pd-Si-R glasses.

关键词： thermal stability amorphous alloy Pd-Si alloy rare-earth element

Influence of Rare-Earth Elements on ElectricalProperties of Pd

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Journal of Materials Science & Technology 1994年第6期10卷 459-462页

作者： Fei WEN yuantao ning Huaizhi ZHAO and Deguo DENG(Kunming Institute of Precious Metals, Kunming, 650221, China) Kunming Inst of Precious Metals Kunming China

The influence of RE (RE = La, Ce. Pr. Nd, Sm, Eu, Gd. Tb. Dy, Er, Yb) additives with dilute concentrations on the electrical properties of Pd has been studied. All RE elements increase the specific resistivity (ρ) and decrease the resistance temperature coefficient (α) of Pd. and (ρ.α) Pd-RE ls equal to (ρ· α)*** RE elements before Gd reduce the thermo-emf of Pd on Cu. other heavy RE enhance the *** experimental data of normalized Pd-0.1 at.-%RE alloys indicate that the effect of light RE additives on the specific resistivity of Pd is larger than that of heavy RE and Ce. Eu and Yb show anomalous strong effect. The valence and atomic size are main factors influencing the electrical properties.

关键词： Influence of Rare-Earth Elements on ElectricalProperties of Pd Eu

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Pd的氧化与表面状态

稀有金属材料与工程 2011年第7期40卷 1256-1259页

作者：戴红宁远涛昆明学院云南昆明650214 昆明贵金属研究所云南昆明650106

采用热重分析仪(TG)和差热分析仪(DSC)测定海绵Pd试样从室温直至1200℃升温过程中的相对热量和质量变化;采用X射线光电子能谱(XPS)测定不同处理条件下Pd片材试样的表面状态。在吸热-放热曲线上观测到了PdO形成(260℃)、分解(720℃)和蒸... 详细信息

采用热重分析仪(TG)和差热分析仪(DSC)测定海绵Pd试样从室温直至1200℃升温过程中的相对热量和质量变化;采用X射线光电子能谱(XPS)测定不同处理条件下Pd片材试样的表面状态。在吸热-放热曲线上观测到了PdO形成(260℃)、分解(720℃)和蒸发(877℃)等热效应。750℃以下Pd氧化是一个增重过程,而在更高温度下PdO的分解和蒸发导致失重。当Pd在高于850℃以上加热或淬火时,Pd呈Pd0化学态而保持光亮的金属表面;但是在低于此温度加热或淬火时,Pd表面因被PdO膜覆盖而呈暗晦色。

关键词： Pd 氧化分解蒸发表面状态