Pudong new district, Shanghai, China.
Ordered alloys which cannot be disordered by heat treatments and quenching can still be effectively disordered by irradiation or by ball-milling. The disordered state is achieved during this extreme form of cold-work by the creation of several kinds of defects; in particular vacancies and dislocations.
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A BÏ2212 article may be formed by mixing metallic precursor powders including bismuth, strontium, calcium and copper in an oxygen-free atmosphere, mechanically alloying the metallic precursor powders in an oxygen-free atmosphere, and heating the metallic precursor alloy according to a temperature profile. The profile may include a ramp-up stage during which the alloy is heated to a peak ...
High-energy ball milling is a solid state powder processing technique and is a very useful for preparing Nb-Al alloys (Nb3Al). The effects of ball milling time and annealing temperature on the ...
We provide evidence that a single mechanism—flux flow along channels—can explain the functional form of the critical current density (Jc) in the low-temperature superconductor Nb3Sn and in the high-temperature superconductors (HTS) YBa2Cu3O7−δ (YBCO) and (Bi,Pb)2Sr2Can−1CunOx (BiSCCO) in low and high magnetic fields. In this paper, we show that standard flux pinning theories, …
The in-situ preparation method followed conventional standards, such as powder mixing in a ball mill and heat treatment in argon flow. The ex-situ preparation method used more sophisticated techniques, such as high energy ball milling and heat treatment under high pressures (Hot Isostatic Press, HIP).
That plastic deformation can occur in nominally brittle Nb3Sn must be the result of a large hydrostatic component of the stress state in the powders during ball milling. View Show abstract
Ball mass is an important parameter that is known to have an influence on the outcome of a mechanochemical reaction induced by ball-milling. A standard way of modifying the ball mass is to change the size of the ball made of the same material. In this case, however, a change in mass is accompanied by a simul Editor's Collection: Mechanochemistry The Solid State of Pharmaceuticals
Nb3Sn was prepared by milling Nb and Sn powder mixtures followed by limited reactions to restrict disorder recovery. Although disorder reduced the superconducting critical temperature Tc, the concomitant electron scattering increased the upper critical field mu0Hc2 to as high as 35 T at 0 K, as determined by the Werthamer-Helfand-Hohenberg equation. Hc2 was higher for longer milling times …
Ball milling of rye bran gave rise to similar results, with the A/X ratio of the extractable AX being considerably lower (0.51). Optimization of the ball mill treatment by varying the degree of filling of the milling jar permitted us to obtain equally high WE-AX levels (>70%) in wheat and rye bran within a 24 h ball-milling period.
New end mill series covering a wide range of machining applications. All Impact Miracle end mills are coated ... Ball nose, Short cut length, 2 flute, For hardened materials Ball nose, Long cut length, 2 flute, For hardened materials 36 different sizes available.
A method for forced oxidative mechanochemical degradation of active pharmaceutical ingredients (APIs) using clopidogrel hydrogensulfate as a model compound is presented. Considerable and selective formation of degradants occurs already after very short reaction times …
The critical currents of several Cu-Nb3Sn P/M multi- filamentary ribbons obtained after a reduction R =500 are shown in Fig. 4. The three upper curves correspond to samples containing Nb powders obtained by the hydride- dehydride process and the other curves correspond to P/M materials containing Nb powders produced by ball-milling.
Graphene and MoS 2 were modified by organic molecules to obtain modified reduced graphene oxide (MRGO) and modified molybdenum disulfide (MMD) powders. MRGO and MMD were uniformly dispersed in base oil (PAO6) by ultrasonic and microwave assisted ball milling (UMBM). This study tested the dispersion stability and tribological properties of additives in the oil, and analyzed …
12%The Nb3Sn was successfully prepared by a fast and convenient method in which the mixture of the Nb, Sn, and Cu powder was mechanically alloyed followed by heat treatment. The morphology, crystal structure, and critical temperature were measured by SEM, XRD, and VSM. The results show that with increased milling time, the size of the powders becomes …
Anisotropic Cu-O strain has been measured and a relation between the superconducting critical temperature and the strain is studied in the YBa2Cu3O6+k …
Mechanical alloying, a high energy ball milling technique, was used to process elemental metal powders. Multifilamentary Cu-Nb3Sn composites were formed by mixing the mechanically alloyed Nb/Sn powders with Cu powders, isostatically compacting the mixture, hydrostatically extruding to wire form, and diffusion reacting to form the A15 superconducting compounds from the mechanically …
nologies, namely, development of Nb3Sn and NbTi superconductor strands and fabrication technology of large superconductor magnets, TBM related R&D activities, development of high capacity cryopump and fabrication technology of prototype vacuum vessel, development of technology for divertor fabrication, and development of negative ion beam.
Further investigations should be concentrated on the developing of refinement particles during ball milling, production of the composites and powder consolidation method.Practical implications: The experiments in this work supply knowledge of ductile and less ductile powders behaviour in mechanical alloying process.
The influence of the original nominal chemical composition, milling time, sintering temperature and holding time was studied systematically on the phase formation, microstructure and superconductivity of mechanically alloyed Nb3Al. By optimizing the process, we have successfully prepared high-performance Nb3Al superconductor. Samples with original nominal composition of Nb …
Atomic disorder in Nb3Sn during heavy mechanical impact. Di, L-M; Loeff, PI; Bakker, H. Transformation of glassy indomethacin induced by ball-milling. Desprez, S; Decamps, M. Athermal character of the solid state amorphization of lactose induced by ball milling.
Ball milling is a simple, fast, cost-effective green technology with enormous potential. One of the most interesting applications of this technology in the field of cellulose is the preparation and the chemical modification of cellulose nanocrystals and nanofibers. Although a number of studies have been repo Recent Review Articles Nanoscale Advances Most Popular Articles
From this model and the tempering experiment, it is inferred that significant Table 1 Number of impacts for various ball and kinetic energy values Mill operation for 0.50 seconds Kinetic energy of impact (Joules) Number of (2 g each) balls used 10-7_10-4 0 0 10-4_10-3 43 10-3_10-2 10-2-10-1 3 13 24 10-1-1.0 0 1 0 0 Mill operation for 1.00 ...
The grinding media is actually alumina particles held in place by an SiO2 glass phase. Sizes from 400 microns to over 1 inch in beads, balls, satellites (ball with bands) and cylinders. Low to medium cost, small sizes are more costly. Fused Zirconium oxide Grinding Media (sp.gr. 3.8) Smooth surface leads to low mill wear and longevity.
The ball-milling Fe-biochar composite could effectively remove RR120 by up to 90.1 mg g-1 at pH of 7.5, and slightly alkaline condition was preferred. Adsorption kinetics showed that ball-milling Fe-biochar composite could quickly sorb RR120 with the rate constant (k 2) of 2.07 g mg-1 min-1 (pH = 7.5). Positive surface charge and large surface ...
The A15 Nb3Sn compound is extremely brittle at tempera- tures below 1000, but the increase in micro- hardness values observed in ball-milled Nb3Sn indicates that the Nb3Sn compound can be plas- tically deformed under the stress state existing during milling and this normally "brittle" struc- ture can store the energy of cold work.
US20080072407A1 US11/859,687 US85968707A US2008072407A1 US 20080072407 A1 US20080072407 A1 US 20080072407A1 US 85968707 A US85968707 A US 85968707A US 2008072407 A1 US2008072407 A1 US 2008072407A1 Authority US United States Prior art keywords metal billet ductile tantalum copper Prior art date Legal status (The legal status is an …
That plastic deformation can occur in nominally brittle Nb3Sn must be the result of a large hydrostatic component of the stress state in the powders during ball milling. View Show abstract
This project involves fundamental and applied scientific investigations into nanocrystalline high-field materials. The project is focussed on fabricating nanocrystalline YBa2Cu3O7, Bi2Sr2CaCu2O8 and Bi2Sr2Ca2Cu3O10 through mechanical ball milling, hot isostatic pressing and annealing, as well as understanding the physics of this new class of high magnetic field superconductors.
Mechanical alloying of Al60−xTi40Six (x = 10, 20, 30) by high-energy ball milling yields a composite microstructure comprising varying proportions of amorphous and nanocrystalline phases.
This ball mill is typically designed to grind mineral ores and other materials with different hardness, and it is widely used in different fields, such as ore dressing, building material field, chemical industry, etc. Due to the difference of its slurry discharging method, it is divided to …
I had this idea since I recently discovered how to easily make balls on the milling machine and lathe. As I currently don't know what to restore next, I deci...
Nb3Sn was prepared by milling Nb and Sn powder mixtures followed by limited reactions to restrict disorder recovery. Although disorder reduced the superconducting critical temperature Tc, …
A ball mill, a type of grinder, is a cylindrical device used in grinding (or mixing) materials like ores, chemicals, ceramic raw materials and paints.Ball mills rotate around a horizontal axis, partially filled with the material to be ground plus the grinding medium. Different materials are used as media, including ceramic balls, flint pebbles, and stainless steel balls.
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