检索结果-南通市图书馆

Preparation of Diamond-like Carbon Films on the Surface of Ti Alloy by Electro-deposition

在线全文

学校读者我要写书评

暂无评论

Journal of mat.rials Science & Technology 2004年第3期20卷 367-368页

作者： Fenglei SHEN Hongwei WANG Dijiang WEN sch.ol of mat.rials Engineering,Suzhou University,Suzhou 215021,China sch. of mat. Eng. Suzhou Univ. Suzhou 215021 China

In this paper, diamond-like carbon (DLC) films were deposited on Ti alloy by electro-deposition. DLC films were brown andcomposed of the compact grains whose diameter was about 400 nm. Examined by XPS, the main composition of the filmswas carbon. In the Raman spectrum, there were a broad peak at 1350 cm^(-1) and a broad peak at 1600 cm^(-1), which indicatedthat the films were DLC films.

关键词： Diamond-like carbon film Electro-deposition Ti alloy Surface

Recovery of Titanium from the Rich Titanium Slag by H2SO4 Method

在线全文

学校读者我要写书评

暂无评论

Journal of mat.rials Science & Technology 2003年第2期19卷 191-192页

作者： Zhenqi HUANG, Minghua WANG, Xinghong DU and Zhitong SUIsch.ol of mat.rials and Metallurgy, Northeastern University, Shenyang 110006, China sch. of mat. and Metall. Northeastern Univ. Shenyang 110006 China

The blast furnace slag bearing Ti02 in Panzhihua, China, is an important resource to be utilized. In the present paper, the effects of the ratio of slag to H2S04, the reaction temperature, the particle size of the slag, and the concentration of H2S04 on the reaction rate and the acidolysis ratio of Ti were studied. The results indicated that the maximum acidolysis ratio reached 98%, which can serve as an experimental basis for the production of titania from the slag.

关键词： Slag bearing TiO2 H2SO4 Acidolysis Titanium recovery

Dependence of Structure and Magnetic Properties on Annealing Temperature in Fe(72.5)Cu1Nb2V2Si(13.5)B9 Alloy

在线全文

学校读者我要写书评

暂无评论

Journal of mat.rials Science & Technology 2003年第3期19卷 285-286页

作者： Chunyan BAN, Wenqing GAO, Guiyi ZENG, Qixian BA Hualin ZENGsch.ol of mat.rials and Metallurgy, Northeastern University, Shenyang 110004, China sch. of mat. and Metall. Northeastern Univ. Shenyang 110004 China

The magnetic properties of Fe_(72.5)Cu_1Nb_2V_2Si_(13.5)B_9 alloy are investigated from an amorphous to a nanocrystalline and complete crystalline state. The sample annealed at 550℃ for 0.5 h shows a homogeneous nanocrystalline structure and presents excellent soft magnetic properties. When the specimens were annealed at a temperature above 600℃, the magnetic properties are obviously deteriorated because the grain size grows up, exceeding the exchange length.

关键词： Fe_(72.5)Cu_1Nb_2V_2Si_(13.5)B_9 alloy Soft magnetic properties Nanocrystalline structure Grain size

Thermal Shock Behaviour of Alumina-Iron Composites

在线全文

学校读者我要写书评

暂无评论

Journal of mat.rials Science & Technology 2002年第4期18卷 347-350页

作者： M.M.El-Sayed Seleman, Xudong SUN and Liang ZUOsch.ol of mat.rials and Metallurgy, Northeastern University, Shenyang 110006, China sch. of mat. and Metall. Northeastern Univ. Shenyang 110006 China

Thermal shock behaviour was investigated for two morphologically different composites comprising an alumina mat.ix and 20 vol. pct Fe particles for a wide range of quenching temperature differences (AT=100~800癈) and compared to a monolithic alumina. The retained strength and critical quenching temperature difference, Tcr of the two composites were a significant improvement over the values for the respective monolithic alumina. Crack lengths and densities were shown to be greater for the alumina than for the two composites at all quenching temperature differences. The thermal shock resistance parameters for monolithic alumina and the two composites were calculated according to their mechanical and physical properties. The calculated results agree well with the experimental one and indicate possible explanations for the differences in thermal shock behaviour.

关键词： Alumina-iron composite thermal shock behaviour Retained strength

Equilibrium Phase Constituents and Discontinuous Precipitation Behavior of Al-Zn-Cu Alloy with Symmetrical Composition

在线全文

学校读者我要写书评

暂无评论

Journal of mat.rials Science & Technology 2003年第5期19卷 419-421页

作者： Shiming HAO, Yuping REN, Hua DING, Dapeng WANG, Gang ZHAO and Hongxiao LIsch.ol of mat.rials and Metallurgy, Northeastern University, Shenyang 110004, China sch. of mat. and Metall. Northeastern Univ. Shenyang 110004 China

Through microstructure observation and X-ray diffraction analysis, the equilibrium phase constituents of Al-Zn alloy that contains 2 at. pct Cu at room temperature have been determined as Al-based solid solution (α), Zn-based solid solution and AI4Cu3Zn phase (T'-phase), which are different from a phase, Zn phase and CuZn4 phase originally believed. It is determined that the products of discontinuous precipitation transformat.on below 277℃ are not the equilibrium phase constituents, but the metastable phases made up of a phase, Zn phase and CuZn4 phase. The phase constituents after discontinuous precipitation of AIZn-2Cu alloy would transform to the ones in equilibrium status: Al-based solid solution (α) in fcc structure, Zn-based solid solution in hcp structure and AI4Cu3Zn phase (T'-phase) ultimat.ly through plastic deformat.on at room temperature and re-heating treatment below 277℃.

关键词： Al-Zn-Cu alloy Discontinuous precipitation Phase constituents Deformat.on

Effect of Copper and Titanium Addition on Microstructures and Magnetic Properties of Sintered Nd_(22) Fe_(71) B_7 Magnets

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2001年第1期19卷 21-24页

作者：宋晓平杨森王献辉孙占波孙军 sch. of mat. Sci. Xi'an Jiaotong Univ. Xi'an 710049 China

Alloying elements Cu and Ti were added to the intergranular regions of sintered NdFeB magnets and their effects on microstructure and magnetic properties were investigated. The results show that small amounts of Cu/Ti additives can enhance the coercivity greatly and have little effect on the remanence of the magnets, while Ti content is less than 1 2%. The improvement of the coercivity can be attributed to the segregation of Cu and Ti on the surface of main phase, which inhibits the growth of main phase grains during sintering. At the same time, segregation of Cu and Ti can also prevent the magnetic coupling of Nd 2Fe 14 B grains to a certain degree and impede effectively the propagation of reversed domain walls through the magnetic phase grains. As the Ti content increased above 1 2% a strip like Ti rich phase appears in the intergranular region, resulting in the dramat.c reduction of the remanence of Nd Fe B magnets. Compared with the single alloying method, the combined alloying of intergranular regions is more efficient to modify the properties of NdFeB magnets.

关键词： rare earths NdFeB magnets alloying coercivity

PREPARATION OF NANOMETER ZINC OXIDE BY EVAPORATION METHOD

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2002年第6期15卷 499-504页

作者： A.A.A. Saleh, X.J. Zhai, Y.C. Zhai and Y. Fusch.ol of mat.rials and Metallurgy, Northeastern University, Shenyang 110004, China sch. of mat. and Metall. Northeastern Univ. Shenyang 110004 China

Nanometer ZnO particles were synthesized by evaporating of zinc powders of averageparticle size of 370μm studied by XRD, TEM and electron diffraction. The particleswere formed by the oxidation of evaporated zinc vapor in the air. It was found that the particles range from 70 to 100nm in average particle size. The effect of experimental parameters was investigated, the increase of the air flow-rates reduced the average particle size, while increasing the evaporation temperature and the amount of metal charged increased the average particle size. TEM of the particles collected showed that the crystal habits of particles have a tetrapod-like of wurtzite structure consists of four needle crystals. It was found by electron diffraction that all particles were single crystal.

关键词： evaporation method nanometer ZnO needle or tetrapod

mat.Emat.CAL AND PHYSICAL MODELING OF INTERFACIALPHENOMENA IN CONTINOUS CASTING MOULD WITH ARGONINJECTION THROUGH SUBMERGED ENTRV NOZZLE

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2000年第5期13卷 1079-1086页

作者： H. Lei, M. Y. Zhu and J.C. He (sch.ol of mat.rials and Metallurgy, Northeastern University, Shenyang 110006, China) sch. of mat. and Metall. Northeastern Univ. Shenyang 110006 China

The study on the fluid flow, meniscus oscillation, slag entrapment in continuous casting mould was conducted mat.emat.cally and experimentally. The results show that the injection of argon into submerged nozzle enhances the meniscus oscillation, thus increases the probability of slag entrapment, and the critical argon blowing flow rate, which will give rise to slag entrapment, is around 10l/min. The trajectory of bubble is affected by the bubble diameter and the molten steel flow, and the bubble diameter is dominant. The bubble with diameter 1.4mm floats fastest with 0.47m/s terminal velocity.

关键词： continuous casting mould argon injection meniscus oscillation slag entrapment mat.emat.cal and physical model

SYNTHESIZING KINETICS AND MICRO-CHARACTERIZATION OF SPINEL LiMn_(2)O_(4) FOR LITHIUM-ION BATTERY CATHODE mat.RIAL

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2001年第5期14卷 323-329页

作者： CATHODE mat.RIAL M.S. Zhao, Y.C. Zhai and Y.W. Tian sch.ol of mat.rial & Metallurgy, Northeastern University, Shenyang 110004, China sch. of mat. Metall. Northeastern Univ. Shenyang 110004 China

The reaction process during synthesis of LiMn2O4 with LiOH·H2O and MnO2 was studied by means of DTA in dynamical air atmosphere, and it could be applied as an important theoretical principle for preparing LiMn2O4. The active energies of four reaction processes were obtained with Doyle-Ozawa method and Kissinger method as follows: 66.299, 72.640, 128.11 and 113.876 kJ·mol-1, respectively. Reaction orders, frequency factors and kinetic equations of each reaction were determined by Kissinger method. XRD, SEM and TEM show that the synthesized LiMn2O4 is a pure phase, with regular appearance and higher ratio-surface.

关键词： Cathodes Inorganic compounds Kinetic theory Synthesis (chemical)