ZHO U Bangxin Southwest Centre for Reactor Engineering Research and Design
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Chengdu
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China Bangxin
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Professor
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P.O.Box 291-106
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Chengdu 610005
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China
金属学报(英文版)
After70-90% cold-rolling,strong{111}〈110〉and weak {111},〈112〉 cold-rolled tex- tures and perfect{111}〈112〉 recrystallization texture were obtained in Fe-Si single crys- tals.The cold-rolled textures with different orientations possesses different ability for recov- ery because of the difference of dislocation structure and store energy alter cold-rolling.The recovery taking place at{111}〈112〉orientation region was prior to that at{111}〈110〉 orientation region.hese subgrains with{111}〈112〉 orientation became recrvstallization nuclei during their growth at expending the surrounding matrix which was sluggish in recovery process.The development of recrystallization textures may be suggested as a process of “nucleation in-situ-selective growth”.The formation of(111)textures in low carbon steel sheets has been discussed in the light of this suggestion.
关键词:
Fe-Si single crystal
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null
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null
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null
Solid State Communications
Considering the image potential, we calculate the binding energies of a shallow donor impurity placed on the centre of a quantum box using the variational approach. The results we have obtained show that there is a great difference of the effects of image potential between the cases including impurity ion image potential and including the image potentials of impurity ion and electron simultaneously. The results also show that the image potential is important, especially when the dimensions of quantum box become small.
关键词:
well;gaas-ga1-xalxas;states
钟祥
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梁娟秋
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喻庆华
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曹诗倜
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周忠华
金属学报
本文介绍了异羟肟酸型螯合萃取剂 H106的稳定性及其在金属萃取中的行为,研究了用 H106进行金属萃取的机理和萃合物的稳定常数.实验结果表明,H106的稳定性很高,对金属的萃取性能很好.H106是一种一元弱酸,在试验条件下,它通过氧-氧配位,与金属离子形成内络盐 MeL_n.其对各金属离子的萃取能力强弱与金属络合物积累稳定常数的大小顺序相一致.在一定条件下,在萃取中表现出极佳的选择性.用 H106由湿法炼锌厂置换渣的硫酸浸出液中回收 Ga 和 Ge 已获得十分满意的结果.也可以用于微量钛测定和其他许多方面.
关键词:
L. H. Lang
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D. C. Kang
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S. H. Zhang
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Z. R. Wang
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S. J. Yuan
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K. B. Nielsen and J. Dancket 1) Department of Materials Engineering
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Harbin Institute of Technology
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Harbin 150001
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China 2) Aalberg University
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Denmark
金属学报(英文版)
In this paper, the forming features of tapered rectangular box during hydrodynamic deep drawing are studied by means of FEM.The effect rules of square blank corner corner amount on body wrinkling are recognized and corresponding methods are discussed. At last, the results of FEM are verified by experi- ment.
关键词:
sheet metal forming
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null
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null
Qunqiang FU
材料科学技术（英文）
At first, a series of finite element method (FEM) simulation tests were used to find the critical forming conditions of hot-galvanized sheet steel during the rectangular box drawing processing when constant blank holder forces were applied. According the test results, the reasonable alteration scope of initial variable blank holder force (VBHF) was as 1.9~2.3 T. Then, based on the test productions of blank holder force, 12 typical VBHF curves were applied to perform the simulation tests by the simulation software of DYNAFORM. The simulation test results showed that VBHF had great effects on drawing formability of hot-galvanized sheet steel during the rectangular box drawing. However, the different VBHF curves were applied to control the whole drawing and it would get great different effects. At the same tine, the VBHF had great effects on the maximum thick thinning ratio, but had little effect on the maximum thick incrassation ratio. So, reasonable application of the VBHF would greatly decrease the fractures. When the VBHF profile is taken as curve L, the best effect of drawing formability could be obtained. When curve I is used, contrary effect could be gotten. The other types of curves would cause effects between above two types of VBHF curves. Finally, the actual tests were applied to check the validity of the FEM simulation tests. The results show that the FEM simulation tests are good ways for predicting and optimizing the VBHF.
关键词:
Drawing process
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变压边力
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热镀锌钢板
柯晓天
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黄超
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张静玲
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柯渔
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吴刚
复合材料学报
doi:10.13801/j.cnki.fhclxb.20141016.002
采用分子量为1 500的聚乙二醇(PEG)为大分子引发剂,引发ε-己内酯开环聚合,合成了分子量为2 900、3 400、4 700的端羟基的聚己内酯-聚乙二醇-聚己内酯(PCEC)嵌段共聚物,并用异氰酸基丙基三乙氧基硅烷(IPTS)将该共聚物端羟基修饰.红外结果表明,该聚合物在3 440、1 732、1 242、1 106 cm-1等处有羟基、酯键、醚键的特征峰,与IPTS反应后在3 350 cm-1、1 531 cm-1处出现了N-H的伸缩振动峰和(N-H)+(C-N)的弯曲振动峰,证实了PCEC以及端基为三乙氧基硅基的PCEC结构.采用溶胶-凝胶法将该产物与生物玻璃前躯体进行反应,获得PCEC-CaO-SiO2-P2 O5有机-无机杂化材料.PCEC-CaO-SiO2-P2 O5杂化材料在模拟体液(SBF)中浸泡24 h后,表面就开始覆盖钙磷沉淀物.XRD测试结果表明,PCEC-CaO-SiO2-P2 O5杂化材料表面覆盖的沉淀物主要成分为羟基磷灰石,表面沉积物随着杂化材料中亲水性成分的增加而增加.力学性能测试表明,随着高分子中PEG含量的增加,PCEC-CaO-SiO2-P2O5有机-无机杂化材料的压缩模量从6.9 MPa上升到65 MPa.细胞毒性表明,PCEC-CaO-SiO2-P2 O5杂化材料对细胞没有明显的毒性.
关键词:
聚己内酯
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聚乙二醇
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杂化材料
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生物玻璃
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骨修复
Journal of Alloys and Compounds
The subsolidus phase relations in the system La2O3-B2O3-P2O5 were investigated. The system can be divided into 12 three-phase regions. There are nine binary compounds and one ternary compound in this system. The ternary compound La7O6(BO3)(PO4)(2) has a monoclinic structure, space groups P2(1)/n, with lattice constants a = 7.0172 Angstrom, b = 17.9125 Angstrom, c = 12.6500 Angstrom, beta = 97.516 degrees, V = 1576.39 Angstrom(3), and Z = 4.
关键词:
La2O3-B-3-B2O3-P2O5 system;phase relations;ternary compounds
陈玮
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姚长江
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尹周澜
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刘新红
耐火材料
doi:10.3969/j.issn.1001-1935.2008.04.009
分别对反应前后的p-Al2O3进行XRD及SEM分析,确定反应前后Al2O3的物相及显微结构变化;测定加入添加剂前后浆体温度与时间的关系,从而确定添加剂对p-Al2O3水化速度的影响;测定加入添加剂前后浆体的黏度变化,从而测定出添加剂对p-Al2O3水化过程的影响.结果表明:1)p-Al2O3属于无定形态;2)在没有添加剂的情况下,p-Al2O3的水化速率很快,同时释放出大量热量,水化产物主要是一水软铝石、三水铝石和拜耳石;3)加入碳酸钠及六偏磷酸钠的混合物为添加剂后,p-Al2O3的水化速率显著降低,释放出的热量显著降低,水化产物主要是一水软铝石.
关键词:
p - 氧化铝
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水化硬化
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不定形耐火材料
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结合剂
鲁俊东
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林根仙
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刘斌
腐蚀与防护
采用失重法和极化曲线法,试验对比了除盐水中几种缓蚀剂对A106碳钢的缓蚀作用,结果显示除盐水中在30~85 ℃间缓蚀剂A的缓蚀效果最好,缓蚀率在95%以上;在试验温度范围内,缓蚀剂A能够稳定地发挥缓蚀作用.
关键词:
缓蚀作用
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缓蚀剂
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极化曲线
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碳钢
