Mechanical Alloying of Pet and Pet/Vectra Blends

1996 ◽  
Vol 461 ◽  
Author(s):  
C. M. Balik ◽  
C Bai ◽  
C.C Koch ◽  
R.J Spontak ◽  
C. K. Saw
Keyword(s):  
Molecular Weight ◽  
Mechanical Alloying ◽  
Ball Milling ◽  
Liquid Nitrogen ◽  
Room Temperature ◽  
Potential Method ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Weight Density ◽  
Energy Ball

ABSTRACTMechanical alloying represents a potential method for producing finely dispersed alloys of normally incompatible polymers. In this paper, PET and blends of PET with a Vectra thermotropic copolyester have been processed via high energy ball milling at room temperature (ambimilled) and at liquid nitrogen temperatures (cryomilled). Milled powders and compacted disks have been characterized using molecular weight, density and hardness measurements, aswell as DSC, WAXS, TEM and FTIR.

Preparation of Cu–Y–Ba alloys by mechanical alloying

1990 ◽  
Vol 5 (9) ◽  
pp. 1802-1805 ◽  
Author(s):  
E. Batalla ◽  
E. G. Zwartz
Keyword(s):  
Mechanical Alloying ◽  
Ball Milling ◽  
Liquid Nitrogen ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Crystalline Phases ◽  
X Ray ◽  
Preliminary Results ◽  
Fine Grained ◽  
Energy Ball

Preliminary results of producing Cu–Y–Ba metallic precursors to high Tc superconductors by high energy ball milling are reported. Mechanical alloying of Cu, Y, and Ba powders (various stoichiometries) produced either amorphous, mixed crystalline/amorphous, or fine grained crystalline powders, as shown by their x-ray spectra. None of the powders exhibited flux exclusion down to a temperature of 1.4 K. The YBa2Cu3 precursor consisted of a mixture of crystalline phases. After being pressed into a pellet and sintered, it was found to be superconducting at liquid nitrogen temperatures.

Effect of surfactant molecular weight on particle morphology of SmCo5 prepared by high energy ball milling

2012 ◽  
Vol 111 (7) ◽  
pp. 07A724 ◽  
Author(s):  
C. A. Crouse ◽  
E. Michel ◽  
Y. Shen ◽  
S. J. Knutson ◽  
B. K. Hardenstein ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Ball Milling ◽  
Particle Morphology ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Energy Ball

Effects of iron impurities in mechanical alloying using steel media

1993 ◽  
Vol 8 (2) ◽  
pp. 239-241 ◽  
Author(s):  
P.J. Yvon ◽  
R.B. Schwarz
Keyword(s):  
Mechanical Alloying ◽  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Metastable Phases ◽  
Iron Contamination ◽  
Energy Ball ◽  
Ball Milling Technique

Mechanical alloying, a high-energy ball-milling technique, is now widely used for preparing alloy powders with metastable phases (crystalline or amorphous). The technique, however, may contaminate the powder with material eroded from the vial and milling media. We report on the analysis and effects of iron contamination on Al25Ge75 powders that we prepared by mechanically alloying mixtures of aluminum and germanium powders, using different mechanical alloying apparatuses.

Nickel Silicides Synthesized by High Energy Ball Milling

2007 ◽  
Vol 353-358 ◽  
pp. 1625-1628 ◽  
Author(s):  
Gen Shun Ji ◽  
Qin Ma ◽  
Tie Ming Guo ◽  
Qi Zhou ◽  
Jian Gang Jia ◽  
...  
Keyword(s):  
Mechanical Alloying ◽  
Ball Milling ◽  
Milling Time ◽  
High Energy ◽  
Planetary Mill ◽  
High Energy Ball Milling ◽  
X Ray Diffraction ◽  
Microstructure Morphology ◽  
Energy Ball ◽  
Xrd Patterns

The high energy ball milling of Ni-50 atom % Si elemental powder mixtures was carried out using a planetary mill. X-ray diffraction (XRD) was used to identify the phase evolutions during the high energy ball milling period. The microstructure morphology of the powders milled different time was determined by field emission scanning electron microscope (FESEM). The beginning time of mechanical alloying was determined by back scattered electrons (BSE) images. The XRD patterns showed that the nickel peaks intensity and the silicon peaks intensity obviously decreased with milling time increased to 1 hour. BSE images revealed that nickel and silicon powders were not blended uniformly for 1 hour of milling. It was found that NiSi formed as the milling time increased to 5 hours, simultaneously, the nickel peaks and the silicon peaks almost disappeared. That means the obvious mechanical alloying started from 5 hours of milling. BSE images agreed with the result analyzed from XRD patterns. With the milling time further increased from 10 to 75 hours, the NiSi peaks decreased gradually, at the same time, the Ni2Si peaks appeared and then increased gradually.

Synchrotron X-ray Absorption Studies of Atomic-Level Alloying in Immiscible Mixtures

1998 ◽  
Vol 524 ◽  
Author(s):  
J.-H. He ◽  
P. J. Schilling ◽  
E. Ma
Keyword(s):  
Ball Milling ◽  
Room Temperature ◽  
High Energy ◽  
Atomic Level ◽  
High Energy Ball Milling ◽  
Edge Structure ◽  
X Ray ◽  
Energy Ball ◽  
Immiscible Mixtures ◽  
X Ray Absorption

ABSTRACTAn X-ray absorption beamline has been developed recently at the electron storage ring of the LSU Center for Advanced Microstructures and Devices. Using Extended X-ray Absorption Fine Structure (EXAFS) and X-ray Absorption Near Edge Structure (XANES), we have studied the local atomic environments in immiscible mixtures processed by high-energy ball milling, a mechanical alloying technique involving heavy deformation. By examining the local coordination and bond distances, it is concluded that atomic-level alloying can indeed be induced between Cu and Fe through milling at room temperature, forming substitutional fcc and bcc solid solutions. In addition to single-phase regions, a two-phase region consisting of fcc/bcc solutions has been found after milling at both room temperature and liquid nitrogen temperature. In contrast to the Cu-Fe system, solid solution formation is not detectable in milled Ag-Fe and Cu-Ta mixtures. This work demonstrates the power of synchrotron EXAFS/XANES experiments in monitoring nonequilibrium alloying on the atomic level. At the same time, the results provide direct experimental evidence of the capability as well as limitations of high-energy ball milling to form alloys in positive-heat-of-mixing systems.

Structural transformations of alumina by high energy ball milling

1993 ◽  
Vol 8 (11) ◽  
pp. 2985-2992 ◽  
Author(s):  
P.A. ZielińAski ◽  
R. Schulz ◽  
S. Kaliaguine ◽  
A. Van Neste
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Ball Milling ◽  
Room Temperature ◽  
High Energy ◽  
Structural Transformations ◽  
High Energy Ball Milling ◽  
Second Step ◽  
Transformation Rate ◽  
Energy Ball

Room temperature, high energy ball milling was applied to various transition aluminas (γ, K, χ), producing thermodynamically stable α-alumina–a phenomenon that could otherwise be achieved only by high temperature (1100–1200 °C) heat treatment. The transformation proceeds in two steps. The first one consists of rapid microstructural rearrangements with continuously increasing α-transformation rate. In the second step (1–2 h from the start), only relatively small changes in morphology are observed with a constant α-transformation rate. The rate is influenced only by the milling intensity. The presence or the absence of oxygen in the milling atmosphere has a large influence on the final surface area of α-alumina.

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