L.F Li
,
YY Li
,
O. Sbaizeroand S. Meriani(Cryoguic Laboratory Chinese Academy of Sciences
,
Beijing 100080
,
China )(Institute of Metal Research
,
Chinese Academy of Sciences
,
Shenyang 110015
,
China)(Materials Engineering Department
,
University of Triesty
,
Italy)
金属学报(英文版)
The use of zirconia-based ceramic materials as smpport materidls for superconducting magnets and in cryopenic engineeriny generally has been considered. The relationship between compsition and mechanical properties at cryogenic temperature has also been investigated.
关键词:
structural material
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null
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null
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null
B.W. Wang
,
H. Shen
金属学报(英文版)
Ni-Cr System solar selective thin solid films were prepared by d.c. magnetron reactivesputtering under the atmosphere of O2 and N2. Ni-Cr alloy was chosen as targetmaterial and copper sheets as substrate. Using SEM, Spectrophotometer and Talystepto analyze the relations between the selective characteristic and the structure, theformation and the thickness of the thin films. The aim is to obtain good solar selectivethin films with high absorptance and low emittance, which is applied to flat plate solarheat collectors.
关键词:
solar selective thin film
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null
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null
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null
YUE Kexiang DONG Yuanchi East China Institute of Metallurgy
,
Ma'anshan
,
China
金属学报(英文版)
The equilibrium constants between Sr-O,Ba-O and Sr-S,Ba-S in liquid iron at 1570℃ and the interaction coefficients concerning these elements have been determined as follows: K_(Sro)=1.897×10~(-7),e_O~(Sr)=-43.8 K_(BaO)=8.204×10~(-8),e_O~(Ba)=-98.0 K_(SrS)=8.356×10~(-7),e_S~(Sr)=-3.9 K_(BaS)=4.083×10~(-7),e_S~(Ba)=-3.5
关键词:
equilibrium
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null
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null
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null
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null
Z. Sun
,
S.L. Zheng
,
Y. Zhang
,
null
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null
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null
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null
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null
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null
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null
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null
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null
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null
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null
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null
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null
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null
金属学报(英文版)
Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process.
关键词:
chromite
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null
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null
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null
王龙妹
,
杜挺
金属学报
由低温无水电解稀土夹杂物和固体电解质定氧活度测得Ni液中Ce_2O_3,CeS及Ce_2O_2S生成反应的平衡常数,由此可得: △G°_(Ce_2O_3)=-116240+315.8 T △G°_(Ces)=-570280+220.1 T △G°_(Ce_2O_2S)=-984850+238.5 T 由实验测得数据经热力学分析计算得到1600℃Ni液中a_O-a_S平衡图,为理论上预测夹杂物生成的先后次序及类型提供了依据。
关键词:
Corrosion Science
The early stages of the evolution of atmospheric corrosion of carbon steels exposed in both a laboratory simulated and a natural atmosphere environment in Shenyang have been observed by in situ scanning electron microscopy. In the case of laboratory cyclic wet-dry tests, even though the chloride content level is very low, filiform corrosion is initiated in the early stage. The filiform corrosion grows in random directions, forming a network of ridges. White nodules nucleate and grow on the ridges during continued corrosion and eventually connect with each other to form the initial corrosion scale. Pits were also found on the surface beneath corrosion products. In the case of a natural atmospheric environment, both filiform corrosion and other localized corrosion, such as pitting and inter-granular attack take place in the initial stage. It is obvious that there is variety of localized corrosion in the initial stage of atmospheric corrosion. (C) 2007 Elsevier Ltd. All rights reserved.
关键词:
steel;atmospheric corrosion;initial stage;localized corrosion;in-situ;iron;electrolyte;thickness
X. He
材料科学技术（英）
Composited nanoparticles, consisting of Mn3O4, S-doped Mn3O4 and S, were synthesized by co-precipitation reaction and Mn3O4 nanoparticles were then obtained after removing the pure S from the composited nanoparticles. The Mn3O4-type phase with larger lattice constant a was formed by doping sulfur. At fixed temperatures below Curie temperature (TC), the magnetization of the S-doped Mn3O4/S composited nanoparticles was smaller than that of the Mn3O4 nanoparticles. The blocking temperature was 36.3 and 34.8 K for S-doped Mn3O4/S composite and Mn3O4 nanoparticles, respectively. The anisotropy field of S-doped Mn3O4/S composite was determined to be about 55.3 kOe.
关键词:
Nanostructured materials
材料科学技术（英）
Composited nanoparticles, consisting of Mn(3)O(4), S-doped Mn(3)O(4) and 5, were synthesized by co-precipitation reaction and Mn(3)O(4) nanoparticles were then obtained after removing the pure S from the composited nanoparticles. The Mn(3)O(4)-type phase with larger lattice constant a was formed by doping sulfur. At fixed temperatures below Curie temperature (T(C)), the magnetization of the S-doped Mn(3)O(4)/S composited nanoparticles was smaller than that of the Mn(3)O(4) nanoparticles. The blocking temperature was 36.3 and 34.8 K for S-doped Mn(3)O(4)/S composite and Mn(3)O(4) nanoparticles, respectively. The anisotropy field of S-doped Mn(3)O(4)/S composite was determined to be about 55.3 kOe.
关键词:
Nanostructured materials;Chemical synthesis;X-ray diffraction;Magnetic measurements;canted-spin problem;nanocrystallites
材料科学技术（英）
BIOSS4 steel is essentially a nickel-free austenitic stainless steel developed by the Institute of Metal Research, Chinese Academy of Sciences, in response to nickel allergy problems associated with nickel-containing stainless steels that are widely used in medical applications. The high nitrogen content of this steel effectively maintains the austenitic stability and also contributes to the high levels of corrosion resistance and strength. BIOSS4 steel possesses a good combination of high strength and toughness, better corrosion resistance, and better blood compatibility, in comparison with the medical 316L stainless steel. Potential applications of BIOSS4 steel can include medical implantation material and orthodontic or orthopedic devices, as well as jewelries and other decorations.
关键词:
medical stainless steel;nitrogen;nickel-free;nickel-allergy;blood;compatibility;austenitic steels;high-nitrogen;corrosion;cells
