L. H. Lang
,
D. C. Kang
,
S. H. Zhang
,
Z. R. Wang
,
S. J. Yuan
,
K. B. Nielsen and J. Dancket 1) Department of Materials Engineering
,
Harbin Institute of Technology
,
Harbin 150001
,
China 2) Aalberg University
,
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
,
null
,
null
杨慧芬
,
唐琼瑶
,
王传龙
,
张露
,
李甜
中国有色金属学报
为考察红城红球菌(Rhodococcus erythropolis,R. erythropolis)作为赤铁矿捕收剂使用的可能性及效果,对R. erythropolis形貌、细胞壁成分及其吸附前后赤铁矿、石英表面电性、疏水性进行分析,对赤铁矿、石英单矿物以及赤铁矿与石英矿1:1(质量比)混合矿进行浮选实验,对其在赤铁矿表面的吸附状况及吸附机理进行研究.结果表明,杆状R. erythropolis表面既含有非极性基团,又含有极性基团,使得其表面具有较高的负电性和较强的疏水性,因而对赤铁矿的吸附作用明显大于对石英的吸附作用.当以此细菌为捕收剂、在溶液 pH 值为6、R. erythropolis用量为75 mg/L时,赤铁矿的回收率为89.68%,而石英的回收率仅为26.25%.混合矿经过一次浮选,可获得铁品位和回收率分别为50.08%和76.41%的铁精矿.R. erythropolis在赤铁矿表面发生复杂的化学吸附且使赤铁矿颗粒形成疏水絮团,从而证实R. erythropolis可作为赤铁矿的捕收剂使用.
关键词:
R. erythropolis
,
微生物
,
赤铁矿
,
石英
,
吸附
,
絮团
,
捕收剂
许少普
,
崔冠军
,
李治强
,
杨东
,
庞百鸣
,
张智慧
钢铁研究
采用模铸浇注、3 800 mm轧机轧制、正火热处理工艺成功地开发并批量生产了82 mm厚Q345R-Z35锅炉压力容器用钢板,钢板超声波探伤全部符合JB/T 4730--2008一级标准,钢板屈服强度平均为350 MPa,抗拉强度平均为520 MPa,伸长率平均值为28%,平均冲击功为144 J,抗层状撕裂厚度拉伸性能全部合格,抗氢致开裂性(HIC)试验检测结果表明:裂纹敏感率、裂纹长度率、裂纹宽度率均为0.
关键词:
抗氢致裂纹
,
抗层状撕裂
,
特厚压力容器板
材料科学技术（英）
Structure and magnetostriction of Dy1-xPrxFe2 (0 less than or equal to x less than or equal to 0.5), Dy0.6Pr0.4(Fe1-yTy)(2) (0 less than or equal to y less than or equal to 0.6), and Tb1-zPrz(Fe0.4Co0.6)(2) (0 less than or equal to z less than or equal to 1.0) alloys (T=Co, Ni) have been investigated. It is found that the matrix of the alloys Dy1-xPrxFe2 is a single phase (Dy, Pr)Fe-2 with MgCu2-type structure and the second phase is (Dy, Pr)Fe-3 when x less than or equal to 0.2. The amount of (Dy, Pr)Fe-3 phase increases with increasing Pr content and becomes the main phase when x=0.4. The matrix of Dy1-xPrxFe2 is found to be the (Dy, Pr)(2)Fe-17 phase with Th2Zn17-type structure when x=0.5. It is found that the amount of the cubic Laves phase (Dy, Pr)(Fe, Co)(2) in the Dy0.6Pr0.4(Fe1-yCoy)(2) increases with increasing Co concentration when 0 less than or equal to y less than or equal to 0.6. The substitution of Ni for Fe is nearly not favorable for the formation of the cubic Laves phase (Dy, Pr)(Fe, Ni)(2) in (Dy1-xPrx)Fe-2. The matrix of (Tb1-zPrz)(Fe0.4Co0.6)(2) is a (Tb, Pr)(Fe, Co)(2) phase with the MgCu2-type cubic Laves structure and a second phase of small amount is (Tb, Pr)(Fe, Co)(3) phase when z less than or equal to 0.2, z=0.5 and 1.0. When 0.2<z less than or equal to 0.4, the amount of the (Tb, Pr)(Fe, Co)(3) phase with PuNi3-type structure increases with increasing z and becomes the main phase when z=0.4. When 0.5<z less than or equal to 0.6 the amount of the (Tb, Pr)(Fe, Co)(3) phase increases sharply, whereas for 0.6<z less than or equal to 0.8 it decreases with increasing z. The polycrystalline magnetostriction, lambda(parallel to) - lambda(perpendicular to), at room temperature of Dy1-xPrxFe2 exhibits a peak when x=0.3. The lambda(parallel to) - lambda(perpendicular to) for Dy0.6Pr0.4(Fe1-yMy)(2) (M=Co, Ni) and Tb1-zPrz (Fe0.4Co0.6)(2) is also examined.
关键词:
Zhijun GUO
,
Zhidong ZHANG
,
Xinguo ZHAO
,
Bowen WANG
,
Dianyu GENG
材料科学技术（英）
Structure and magnetostriction of Dy1-xPrxFe2 (0 less than or equal to x less than or equal to 0.5), Dy0.6Pr0.4(Fe1-yTy)(2) (0 less than or equal to y less than or equal to 0.6), and Tb1-zPrz(Fe0.4Co0.6)(2) (0 less than or equal to z less than or equal to 1.0) alloys (T=Co, Ni) have been investigated. It is found that the matrix of the alloys Dy1-xPrxFe2 is a single phase (Dy, Pr)Fe-2 with MgCu2-type structure and the second phase is (Dy, Pr)Fe-3 when x less than or equal to 0.2. The amount of (Dy, Pr)Fe-3 phase increases with increasing Pr content and becomes the main phase when x=0.4. The matrix of Dy1-xPrxFe2 is found to be the (Dy, Pr)(2)Fe-17 phase with Th2Zn17-type structure when x=0.5. It is found that the amount of the cubic Laves phase (Dy, Pr)(Fe, Co)(2) in the Dy0.6Pr0.4(Fe1-yCoy)(2) increases with increasing Co concentration when 0 less than or equal to y less than or equal to 0.6. The substitution of Ni for Fe is nearly not favorable for the formation of the cubic Laves phase (Dy, Pr)(Fe, Ni)(2) in (Dy1-xPrx)Fe-2. The matrix of (Tb1-zPrz)(Fe0.4Co0.6)(2) is a (Tb, Pr)(Fe, Co)(2) phase with the MgCu2-type cubic Laves structure and a second phase of small amount is (Tb, Pr)(Fe, Co)(3) phase when z less than or equal to 0.2, z=0.5 and 1.0. When 0.2<z less than or equal to 0.4, the amount of the (Tb, Pr)(Fe, Co)(3) phase with PuNi3-type structure increases with increasing z and becomes the main phase when z=0.4. When 0.5<z less than or equal to 0.6 the amount of the (Tb, Pr)(Fe, Co)(3) phase increases sharply, whereas for 0.6<z less than or equal to 0.8 it decreases with increasing z. The polycrystalline magnetostriction, lambda(parallel to) - lambda(perpendicular to), at room temperature of Dy1-xPrxFe2 exhibits a peak when x=0.3. The lambda(parallel to) - lambda(perpendicular to) for Dy0.6Pr0.4(Fe1-yMy)(2) (M=Co, Ni) and Tb1-zPrz (Fe0.4Co0.6)(2) is also examined.
关键词:
Journal of Solid State Chemistry
The subsolidus phase relations of R2O3-CaO-CuO ternary systems (R = Nd, Sm, Gd, Tm) have been investigated by X-ray powder diffraction. All samples were synthesized at about 950degrees in air. There exists a ternary compound Ca14-xRxCu24O41 (x = 4 for R = Nd, Gd and x = 5 for R = Sm) and a ternary solid solution Ca2+xR2-xCu5O10 (R = Nd, Sm, Gd, Tm) with a wide composition range Deltax of about 0.6. The compound Ca14-xRxCu24O41 possesses a layered orthorhombic structure and is isostructural to Sr14-xCaxCu24O41. The lattice parameters a and c of the compound are basically independent of the ionic radius of R, while the lattice parameter b and unit-cell volume V decrease substantially with the decrease of the ionic radii of R. The Ca2+xR2-xCu5O10 solid solution is isostructural to Ca2+xY2-xCu5O10, the structure of which is based on an orthorhombic "NaCuO2-type" subcell containing infinite one-dimensional chains of edge-shared square planar cuprate groups crosslinked by the layered cations Ca and R that locate in the inter-chain tunnels. (C) 2002 Elsevier Science (USA). All rights reserved.
关键词:
R2O3-CaO-CuO (R = Nd, Sm, Gd, Tm) systems;phase relations;Ca10R4Cu24O41 (R = Nd, Sm, Gd) structure;Ca2+xR2-xCu5O10 (R = Nd, Sm,;Gd, Tm) structure;ternary-system;approximately 950-degrees-c;high-pressure;superconductivity;diagram;air;er;compatibilities;property;oxide
黄鹏
,
邓龙江
,
谢建良
,
梁迪飞
,
陈良
功能材料
采用陶瓷工艺制备Co2Z(Ba3(Co0.4Zn0.6)2Fe23.4O41)六角铁氧体,通过二次球磨掺杂少量BST(BaSrTiO3)铁电材料.研究BST掺杂对Z型铁氧体的烧结温度、相结构、晶粒生长及其在频率1MHz～1GHz的动态相对复介电常数(εr=ε′r-iε″r)和相对复磁导率(μr=μ′r-iμ″r)的影响.结果表明:在BST掺杂量为Co2Z一次预烧料重量比的0～1.5%内,随BST含量增加,形成在Z型六角结构相生长同时,伴生M相六角结构和钙钛矿结构的多相结构;六角结构晶粒明显长大,材料密度增加;μr和εr增大;铁磁共振和铁电共振频率点移向低频.当BST掺杂量为1.5%、频率1MHz时,μ′r=28,ε′r=100,相对于纯相Co2Z材料μ′r和ε′r明显提高.
关键词:
Z型六角铁氧体
,
烧结温度
,
多相结构
,
复磁导率
,
复介电常数
