材料期刊网

MICROSTRUCTURE AND RESISTANCE TO LOCALIZED CORROSION OF DEFORMED 18-5-Nb DUPLEX STAINLESS STEEL

ZHAO Pu LU Shiying Central Iron and Steel Research Institute , Ministry of Metallurgical Industry , Beijing , China ZHAO Pu Engineer , Central Iron and Steel Research Institute , Ministry of Metallurgical Industry , Beijing , China

金属学报(英文版)

The SCC susceptibility of the plastically pre-deformed 18-5-Nb duplex stainless steel to lo- calized corrosion was evaluated in both 25% NaCl+1% K_2Cr_2O_7 and 42% MgCl_2 boiling so- lutions.The y phase in the steel is metastable at room temperature and the γ-α′ martensitic transformation can be induced by cold plastic deformation.With the increase in cold deformation,the volume fraction of α′ martensite increases.Cold plastic deformation results in a remarkable deterioration of SCC resistance of the steel in chloride-containing solutions, resulting from the decrease in corrosion resistance of γ phase in the duplex.It is indicated that, in NaCl solution,the SCC in 18-5-Nb duplex stainless steel initiates at pits and the selective attack on γ phase plays a significant role in the initiation and propagation of SCC.

关键词: duplex stainless steel , null , null

Pu(Ⅳ)、Pu(Ⅴ)在不同质地砂土中的分配

于静 , 司高华 , 黄云贵 , 刘东旭

应用化学 doi:10.3724/SP.J.1095.2011.00388

Pu(Ⅲ)、Pu(Ⅳ)、Pu(Ⅴ)和Pu(Ⅵ)在自然水的pH和Eh(氧化还原电势)值范围内能够共存.在自然环境中主要以Pu(Ⅴ)的PuO2(H2O)n+和Pu(Ⅳ)的Pu(OH)4形式存在.采用静态法测定了Pu(Ⅳ)和Pu(Ⅴ)在砂土介质中的分配系数Kd,Pu(Ⅳ)和Pu(Ⅴ)在砂土中的分配系数范围分别为5.5×103～4×104mL/g和3.2×103～1.1×104mL/g.表明在砂土介质中Pu(Ⅳ)的分配系数(Kd)大于Pu(Ⅴ)的,并且分配系数随砂土介质中粘土矿物含量的增加及介质颗粒粒径减小而增大.

关键词: Pu(Ⅳ) , Pu(Ⅴ) , 砂土 , 分配系数

γ-射线引发PU接枝HEMA的研究

周向东 , 刘朋生

高分子材料科学与工程

聚氨酯(PU)在氮气保护下经60Co-γ射线照射后表面产生自由基,然后浸入到甲基丙烯酸-β-羟乙酯(HEMA)溶液中接枝,再使PU和HEMA的接枝共聚物(PU-g-PHEMA)在催化剂作用下接枝抗静电剂TN,由此合成表面具有耐久性抗静电的聚氨酯(PU-g-PHEMA-g-TN).通过FT-IR、ESCA、SEM等手段表征了PU辐射接枝HEMA的产物,并研究了影响PU接枝HEMA的主要因素.结果表明,HEMA的接枝率随辐射剂量和单体浓度的增加而增加,随剂量率的增加而减小,低浓度的溶剂(乙醇)有利于接枝.

关键词: γ-射线 , 聚氨酯 , 接枝 , 甲基丙烯酸-β-羟乙酯

La,Ce,Pr,Nd and Sm concentrations in Pu'er tea of Yunnan,China

稀土学报(英文版) doi:10.1016/S1002-0721(09)60170-8

关键词:

Introduction to atmospheric corrosion research in China

Science and Technology of Advanced Materials

In this paper, we introduce the research on atmospheric corrosion in China. We describe the climate characteristics and the classification of atmospheric corrosivity across the whole country. We also describe the rusting evolution under simulated wet/dry cyclic conditions. (C) 2007 NIMS and Elsevier Ltd. All rights reserved.

关键词: atmospheric corrosion;corrosivity;rusting evolution;weathering steels;rust;mechanism;so2;o-3;no2

Recent Advances of Laser Coating Technology in China

LIANG Yong LI Ruiguo Institute of Metal Research , Academia Sinica , Shenyang 110015 , ChinaInstitute of Corrosion and Protection of Metals , Aademia Sinica , Shenyang , 110015 , China

材料科学技术（英文）

Recent advances in laser coating technology including laser cladding,laser surface alloying and laser vapour deposition in China are reviewed in this paper.

关键词: laser , null , null , null , null

PU/PMMA IPN的阻尼行为研究

秦东奇 , 王静媛 , 于小强 , 李峰 , 汤心颐

高分子材料科学与工程

采用全自动扭辫仪和驻波管对PU/PMMA IPN 体系的阻尼行为进行了研究.TBA结果表明,填料的最佳填加量为10%.吸音系数测试表明,常温时该种结构的IPN材料的吸音系数与频率近似成峰形,最大吸收在3000 Hz左右.最好的吸音材料的吸音系数峰值为50%以上.

关键词: 阻尼因子 , 吸音系数 , 填料 , 阻尼行为

Development of Cast Superalloys for Gas Turbines in China

CHEN Rongzhang CHEN Wanhua Institute of Aeronautic Materials , Beijing 100095 , China.

材料科学技术（英文）

As in other countries,significant achievements in the research of cast superalloys for many years have also been obtained in China.These results are important contribu- tion to the development of aero and land-based gas tur- bine engines.

关键词: cast superalloy , null

R&D STATUS ON INTERMETALLICS IN CHINA

CHEN Guoliang(State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 , China)SHI Changxu (Academia Sinica , Beijing 100864 , China)

金属学报(英文版)

This paper briefiy introduces the R&D of intermetallics in China. R&D on intermetallics in a national scale in China began near ten years ago. The investigation in past years focused on the fundamental research and materials development. A significant progress has been made. Various components that made of Ti3Al Ni3Al, TiAl and Fe3Al have been successfully manufactured Some of them have been evaluted. It is expected that some intermetallic alloys will be produced in an industrial scale in the near future.

关键词: :intermetallic alloys , null , null , null

Preparation, Morphology and Damping Property of PU/UP Interpenetrating Polymer Networks

Dongyan TANG , Liangsheng QIANG , Zheng JIN , Liancheng ZHAO

材料科学技术（英文）

Interpenetrating polymer networks (IPNs) composed of acrylate-modified polyurethane (PU)/unsaturated polyester (UP) resin $via$ simultaneous polymerization with various component ratios of PU/UP were prepared. The polymerization processes of IPNs were traced through infrared spectrum (IR) techniques, by which the phase separation in systems could be controlled effectively. Results for the morphology and miscibility among multiple phases of IPNs, obtained by transmission electron microscope (TEM) indicated that the domains between two phases were constricted in nanometer scales. The dynamic mechanical thermal analyzer (DMTA) detection results revealed that the loss factor (tanδ) and loss modulus (E'') increased with the polyurethane amounts in system, and the peak value in curves of tanδ and E'' appeared toward low temperature ranges. Maximum tanδ values of all samples were above 0.3 in the nearly 50℃ ranges. Also, the mechanical properties of PU/UP IPNs were studied in detail.

关键词: Interpenetrating polymer networks (IPNs) , null , null , null