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BEHAVIOR OF FLOW STRESS OF ALUMINUM SHEETS USED FOR PRESSURE CAN DURING COMPRESSION AT ELEVATED TEMPERATURE

The behavior of flow stress of Al sheets used for pressure can prepared by different melt-treatment during plastic deformation at elevated temperature was studied by isothermal compression test using Gleeble1500 dynamic hot-simulation testing machine. The results show that the Al sheets possess the remarkable characteristic of steady state flow stress when they are deformed in the temperature range of 350-500℃ at strain rates within the range of 0.01-10.0s-1. A hyperbolic sine relationship is found to correlate well the flow stress with the strain rate, and an Arrhenius relationship with the temperature, which implies that the process of plastic deformation at elevated temperature for this material is thermally activated. Compared with the Al pieces prepared by no or conventional melt-treatment, hot deformation activation energy of Al sheets prepared by high-efficient melt-treatment is the smallest (Q = 168.0kJ/mol), which reveals that the hot working formability of this material is very better, and has directly to do with the effective improvement of its metallurgical quality.

关键词: Al sheets used for can , null , null

FU105大功率广播发射管用碳化镧钼阴极研究

万小峰 , 张久兴 , 周文元 , 李湘波 , 周美玲

稀有金属材料与工程

研究了FU105大功率广播发射管用碳化镧钼阴极,参照碳化钍钨阴极FU105管的制备工艺,实现了镧钼阴极的碳化以及镧钼阴极FU105管的排气和老炼.通过镧钼阴极FU105管的性能测试,对碳化镧钼阴极的发射能力和稳定性进行了分析.结果认为:FU105管碳化镧钼阴极的发射能力可以达到碳化钍钨阴极的水平,但其稳定性还有待改进.

关键词: 镧钼阴极 , FU105发射管 , 碳化 , 稀土

PS/粉末SBR-g-S共混体研究Ⅱ.粉末SBR-g-S的相结构及其与PS的相容性

王炼石 , 周奕雨 , 夏新江

高分子材料科学与工程

测定了SBR-g-S的接枝率,用TEM检测了粉末SBR-g-S(PR)的相结构.用DSC测定了PS/PR共混体的Tg,研究了PS/PR共混体的相容性.结果发现,在接枝率为32.6%的粉末非交联SBR-g-S(PR1)的相结构中SBR为连续相,在连续相中均匀分布着直径约0.01 μm的PS微区;PS为细胞状分散相,粒径1～5 μm,分散相含有SBR包藏物.在接枝率为8.5%的粉末交联SBR-g-S(PR2)的相结构中PS为连续相,SBR为分散相,分散相粒径约0.3 μm.共混体PS/PR1的相容性优于PS/PR2.SBR在PS富相中有较高的含量是导致PS/PR1共混体在冲击断裂时发生剪切屈服的主要原因.

关键词: 粉末SBR-g-S , 相结构 , PS/粉末SBR-g-S , 共混体 , 相容性

[Pt(en)(5-Fu)2]Cl2配合物的合成及抗肿瘤活性

钟文远 , 崔永春 , 范春兰 , 胡智兴 , 李玛琳

贵金属 doi:10.3969/j.issn.1004-0676.2004.02.005

为寻求高效低毒的新型顺铂类抗肿瘤药物,用K2PtCl4、乙二胺(en)、氟尿嘧啶(5-Fu)为原料,设计合成了顺铂类似物[pt(en)(5-Fu)2]C12配合物,由元素分析、红外光谱和质谱分析初步证实了其化学结构,用改良MTT、SRB法,选用K562、A549、Bel-7402、BIU-87、Bcap-37细胞株对其进行体外抗肿瘤活性测定.结果表明,所合成的配合物除在浓度为0.01、0.1 μg/mL时对K562细胞株抗肿瘤活性大于顺铂和氟尿嘧啶外,其它情况下的抗肿瘤活性均小于顺铂和氟尿嘧啶.该配合物仍有进一步研究的价值.

关键词: 药学 , 铂(Ⅱ)配合物 , 合成 , 抗肿瘤活性

Explanations of the optical spectra and g factor for V3+ ions in ZnX (X = S, Se, Te) crystals

Physica B-Condensed Matter

This paper presents a cluster approach for the calculations of the absorption band positions and the g factor of d(2) tetrahedral cluster. In the approach, the different modifications of e and t(2) orbitals of d electrons and the contribution from the spin-orbit coupling of ligands to the EPR g factor due to the mixing of d(2) ions with the ligands are considered. The calculated band positions and g factor for ZnX : V3+ (X = S, Se, Te) crystals show good agreement with the observed values by using only two adjustable parameters. The contribution from the spin-orbit coupling of ligands to the g factor is discussed. (C) 1998 Elsevier Science B.V. All rights reserved.

关键词: crystal- and ligand-field theory;optical spectra;electron paramagnetic;resonance;spin-orbit coupling;V3+ ZnX (X = S, Se, Te);vanadium centers;znte crystals

CS-KPS复合体系引发S-g-PAM反相胶乳的研究

卢绍杰 , 刘瑞贤 , 孙希明 , 卫乃勤 , 杨光中

高分子材料科学与工程

以K2S2O8为引发剂,研究了在反相乳液中合成淀粉接枝聚丙烯酰胺共聚物(S-g-PAM),实验证明,加入少量铈离子组成复合体系,对提高反应速率、接枝率和接枝效率起到显著的促进作用.文中对硫酸铈-过硫酸钾(CS-KPS)体系的用量及反应影响因素进行了探讨.

关键词: 淀粉接枝 , 丙烯酰胺 , 复合引发体系 , 反相胶乳

ER70S-G焊丝焊接工艺性能的研究

黄治军 , 王玉涛 , 胡家国

钢铁研究

为提高气保焊丝的焊接工艺性能,选用不同化学成分的ER70S-G焊丝进行焊接工艺试验。当焊丝含某种元素X质量分数为0.09%、w（Mn）为1.50%及w（Si）为1.0%时,CO2气体保护焊接飞溅极少,但焊缝宽高比较小,为3.5;当焊丝含某种元素X质量分数为0.01%、w（Mn）为1.70%及w（Si）为0.8%时,CO2气体保护焊接飞溅较少,焊缝宽高比较大,为4.5,显示出很好的焊接工艺性能。结果表明,焊丝的成分对气保焊缝的成形有很大的影响,在某种元素X质量分数、w（Ti）及w（Si）/w（Mn）比适当时,可得到焊接飞溅小、焊缝成形佳的焊接工艺性能。

关键词: ER70S-G , 气保焊 , 飞溅 , 成形

含钛焊丝钢ER70S-G夹杂物演变分析

刘善喜 , 张彩军 , 吕达 , 马德刚 , 李硕

钢铁钒钛 doi:10.7513/j.issn.1004-7638.2016.05.008

为开发含钛焊丝钢ER70S-G,对其冶炼过程中夹杂的数量、尺寸和类型进行研究.研究发现:在精炼过程中,钢中当量直径夹杂物的数目呈现逐渐降低的趋势;到中间包时,当量直径(5μm)夹杂物数目已经从包样的19.78个/mm2减少到1.66个/mm2;精炼过程夹杂物的平均直径呈逐渐降低的趋势,平均直径为2.05 μm;精炼初期,钢中夹杂物类型主要是MnO-SiO2夹杂,到加钛铁前,钢中的主要夹杂物转变为CaO和MgO,从加钛铁后到中间包期间,Al2O3-Ti2O3-MgO系夹杂是钢中的主要夹杂物.

关键词: 含钛焊丝钢 , 夹杂物 , 数量 , 尺寸 , 类型

Relationship between the brittlement susceptibility and H permeation current for UNS g11180 steel in 5% NaCl solution with H2S

材料科学技术（英文）

Sulfide stress corrosion cracking (SSCC) behaviour of UNS G11180 steel in 5% NaCl solution with H2S was, studied by slow strain rate tensile test (SSRT), SEM and electrochemical hydrogen permeation technique. The results reveal different cracking mechanism and H permeation current (I-H) through UNS G11180 steel plate in different concentration of H2S solution. The susceptibility to SSCC of UNS G11180 steel in 5% NaCl solution with H2S was evaluated by the permeation current (I-H, mu A), which depends on the concentration (c x 10(-6)) of H2S by the equation: I-H = 8.525 x c(0.7249). It is proved that the electrochemical H permeation method is a practical way to assess the susceptibility to SSCC.

关键词: cracking

Relationship between the Brittlement Susceptibility and H Permeation Current for UNS G11180 Steel in 5% NaCl Solution with H_2S

Xueyuan ZHANG and Yuanlong DU(State Key Lab. for Corrosion and Protection , Institute of Corrosion and Protection of Metals , Chinese Academy of Sciences , Shenyang 110015 , China)

材料科学技术（英文）

Sulfide stress corrosion cracking (SSCC) behaviour of UNS G11180 steel in 5% NaCl solution with H2S was studied by slow strain rate tensile test (SSRT), SEM and electrochemical hydro gen permeation technique. The results reveal different cracking mechanism and H permeation current (IH) through UNS G11180 steel plate in different concentration of H2S solution. The susceptibility to SSCC of UNS G11180 Steel in 5% NaCl solution with H2S was evaluated by the permeation current(IH, μA), which depends on the concentration (c×10-6) of H2S by the equation:IH = 8.525 ×c0.7249. lt is proved that the electrochemical H permeation method is a practical way to assess the susceptibility to SSCC.

关键词:

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