• Amorphization by ball milling. A review ScienceDirect

    01-10-1988· Physica B 153 (1988) 93-135 North-Holland, Amsterdam AMORPHIZATION BY BALL MILLING. A REVIEW A.W. WEEBER and H. BAKKER Natuurkundig Laboratoriurn der Universiteit van Amsterdam, Valckenierstraat 65, NL-IOI8 XE Amsterdam, The Netherlands" Received 1 March 1988 A new method for the preparation of amorphous alloys is the mechanical alloying process.

    Amorphization by ball milling. A review ScienceDirect

    Amorphization by ball milling. A review. Author links open overlay panel A.W. Weeber H. Bakker. Show more. Share. Cite. The best conditions for minimizing the synthesis time of nanocomposites during high energy ball milling: Modeling and optimizing. Ceramics International, Volume 40, Issue 7, Part A, 2014, pp. 9675-9692.

    Amorphization by ball milling. A review NASA/ADS

    A new method for the preparation of amorphous alloys is the mechanical alloying process. So far, three amorphization reaction types were observed when this technique is used. Which reaction type occurs depends on the local conditions during the milling, such as impact energy and local temperature just after an impact. Amorphous alloys prepared by milling following different reaction types are

    Amorphization by ball milling. A review

    Amorphization by ball milling. A review A new method for the preparation of amorphous alloys is the mechanical alloying process. So far, three amorphization reaction types were observed when this technique is used. Which reaction type occurs depends on the local conditions during the milling,

    Weeber, A.W. and Bakker, H. (1988) Amorphization by Ball

    Weeber, A.W. and Bakker, H. (1988) Amorphization by Ball Milling. A Review. Physica B, 153, 93.

    Ball‐Milling‐Induced Amorphization of Zeolitic Imidazolate

    Ball‐Milling‐Induced Amorphization of Zeolitic Imidazolate Frameworks (ZIFs) for the Irreversible Trapping of Iodine Dr. Thomas D. Bennett Department of Materials Science and Metallurgy, The University of Cambridge, Cambridge, CB2 3QZ (UK), Fax: (+44) 1223‐334567

    Amorphization Induced by Ball — Milling in Some Pure

    Abstract. We report on the crystal to amorphous phase transition induced by ball — milling in pure Si and pure Ge powders. Based on X-ray diffraction patterns, scanning and transmission electron micrographs, EDX microanalyses, differential thermal analyses and differential scanning calorimetry, it seems that amorphization occurs during the continuous decrease of the particle grain size and

    Amorphization mechanisms of NiZr2 by ball-milling

    The microstructure of NiZr 2 in the course of amorphization by ball-milling is studied by transmission electron microscopy (TEM) and x-ray diffraction (XRD). The evolution from the initial fully crystalline alloy to a fully amorphized material is described. It is shown that prior to amorphization, the powder aggregates achieve a 100% nanocrystalline structure; the amorphous phase then appears

    Destruction, Amorphization and Reactivity of Nano-BN Under

    The BN destruction and amorphization under ball milling. Fig. 2 shows the dependence of specific surface area measured by BET on the dose of mechanical treatment. At the initial stage of mechanical treatment specific surface area increases with increase of the dose, reaches maximum of about 400m. 2 /g (at the dose of

    Effect of ball milling on the physicochemical properties

    The purposes of this study were to clarify the amorphization by ball milling of atorvastatin calcium sesquihydrate (AT) and to analyse the change in dissolution kinetics. Methods The amorphous AT was prepared from crystal AT by ball milling and analysed in terms of the changes of its physicochemical properties by powder X‐ray diffraction analysis (XRD), thermal analysis and infrared

    (PDF) Amorphization Induced by Ball — Milling in Some

    For a review: a) A.W.Weeber and H. Bakker. The present results suggest the importance of an energetically up-hill process through ball milling for amorphization of the system with a positive

    Weeber, A.W. and Bakker, H. (1988) Amorphization by Ball

    Weeber, A.W. and Bakker, H. (1988) Amorphization by Ball Milling. A Review. Physica B, 153, 93.

    Ball-milling-induced amorphization in Physical

    Ball-milling-induced amorphization in Ni x Zr y compounds: A parametric study Y. Chen, M. Bibole, R. Le Hazif, and G. Martin Phys. Rev. B 48,14 Published 1 July 1993

    Amorphization Induced by Ball — Milling in Some Pure

    Abstract. We report on the crystal to amorphous phase transition induced by ball — milling in pure Si and pure Ge powders. Based on X-ray diffraction patterns, scanning and transmission electron micrographs, EDX microanalyses, differential thermal analyses and differential scanning calorimetry, it seems that amorphization occurs during the continuous decrease of the particle grain size and

    Effect of ball milling on the physicochemical properties

    The purposes of this study were to clarify the amorphization by ball milling of atorvastatin calcium sesquihydrate (AT) and to analyse the change in dissolution kinetics. Methods The amorphous AT was prepared from crystal AT by ball milling and analysed in terms of the changes of its physicochemical properties by powder X‐ray diffraction analysis (XRD), thermal analysis and infrared

    Ball-milling-induced amorphization in Ni x Zr y

    A vibrating frame grinder has been instrumented for evaluating the amplitude and frequency of ball oscillation, as a function of the amplitude of vibration of the frame and of the ball mass. Based on such measurements, it is found that Ni x Zr y compounds become fully amorphized provided the specific milling intensity is greater than a temperature- and composition-dependent threshold value.

    HRTEM and EELS Studies on the Amorphization of

    We present a new approach, namely ball milling, to synthesize amorphous boron nitride (a‐BN).The amorphization kinetics are revealed by X‐ray diffractometry (XRD), high‐resolution transmission electron microscopy (HRTEM), and electron energy loss spectroscopy (EELS).

    Overview of milling techniques for improving the

    01-07-2015· Ball milling of pure drug mixtures have also been investigated. More recently, ball milling of a combination of two BCS Class II drugs, simvastatin and glipizide, resulted in the formation of stable co-amorphous mixtures . Despite the efficiency of ball milling for size reduction or amorphization, it is less amendable to scale up.

    Amorphization and disordering of the Ni3Al ordered

    Effect of ball-to-powder weight ratio on the amorphization reaction of Al50Ta50 by ball milling. Journal of the Less Common Metals, Vol. 169, Issue. 2, p. 235. CrossRef

    "Destruction, Amorphization and Reactivity of Nano-BN

    The processes of mechanical activation of a hexagonal boron nitride (h-BN) and its reactivity upon interaction with hydrogen and water were investigated using X-ray, TEM, Microdiffraction, Dynamic Light Scattering, FTIR-spectroscopy, adsorption (BET). Initial h-BN samples were monocrystalline plates 70–80 nm thick. Mechanical treatment of h-BN is accompanied by plate splitting and formation

    Amorphization Induced by Ball — Milling in Some Pure

    Abstract. We report on the crystal to amorphous phase transition induced by ball — milling in pure Si and pure Ge powders. Based on X-ray diffraction patterns, scanning and transmission electron micrographs, EDX microanalyses, differential thermal analyses and differential scanning calorimetry, it seems that amorphization occurs during the continuous decrease of the particle grain size and

    Weeber, A.W. and Bakker, H. (1988) Amorphization by Ball

    Weeber, A.W. and Bakker, H. (1988) Amorphization by Ball Milling. A Review. Physica B, 153, 93.

    Ball-milling-induced amorphization in Physical

    Ball-milling-induced amorphization in Ni x Zr y compounds: A parametric study Y. Chen, M. Bibole, R. Le Hazif, and G. Martin Phys. Rev. B 48,14 Published 1 July 1993

    HRTEM and EELS Studies on the Amorphization of

    We present a new approach, namely ball milling, to synthesize amorphous boron nitride (a‐BN).The amorphization kinetics are revealed by X‐ray diffractometry (XRD), high‐resolution transmission electron microscopy (HRTEM), and electron energy loss spectroscopy (EELS).

    BALL MILLING AMORPHIZATION IN A VIBRATING FRAME

    BALL MILLING AMORPHIZATION IN A VIBRATING FRAME GRINDER Y. CHEN, R. LE HAZIF and G. MARTIN Centre d'Etudes Nucl6aires de Saclay, CEREM-DTM-SRMP, F-91191 Gif sur Yvette Cedex, France Resume : On propose un modele simple du trangfert d'energie par

    Destruction, Amorphization and Reactivity of Nano-BN Under

    The BN destruction and amorphization under ball milling. Fig. 2 shows the dependence of specific surface area measured by BET on the dose of mechanical treatment. At the initial stage of mechanical treatment specific surface area increases with increase of the dose, reaches maximum of about 400m. 2 /g (at the dose of

    Amorphization behavior of mechanical alloyed CoTa alloy

    27-11-2020· Abstract Amorphization behavior of Co x -Ta 100- x powders by mechanically alloying mixtures of pure crystalline Co and Ta powder with a high-energy shaker ball mill was studied. The mechanically alloyed powders were amorphous for the composition range between Co 10 Ta 90 and Co 80 Ta 20 . This range is larger than for amorphous alloys prepared by the r.f. sputtering process and

    Methods of amorphization and investigation of the

    22-10-2013· It provides advantages in terms of dissolution rate and bioavailability. This review presents the methods of solid- -state amorphization described in literature (supercooling of liquids, milling, lyophilization, spray drying, dehydration of crystalline hydrates), with the emphasis on milling.

    Research on Metastable Structures Using High Energy

    Amorphization by mechanical milling (MM), where a single composition (e.g. intermetallic compound) is milled requires the accumulation of defects to induce the transformation. It is concluded that anti-site chemical disorder and nanocrystalline grain boundaries are the important defects in this regard.

    Mechanical Milling: a Top Down Approach for the Synthesis

    03-02-2012· ball milling as a non-equilibrium processing method which can be analogous to rapid solidification. This review will first describe the equipment and some of the process va-riables used for high energy ball milling. Next, the physics of the milling processes has been described to the extent

    Ball-milling-induced amorphization in Physical

    Ball-milling-induced amorphization in Ni x Zr y compounds: A parametric study Y. Chen, M. Bibole, R. Le Hazif, and G. Martin Phys. Rev. B 48,14 Published 1 July 1993

    Atmosphere effects of the amorphization reaction in NiZr

    Atmosphere effects of the amorphization reaction in NiZr by ball milling Volume 8 Issue 2. Skip to main content Accessibility help We use cookies to distinguish you from other users and to provide you with a better experience on our websites.

    Amorphization of the prototypical zeolitic imidazolate

    We report the rapid amorphization of the prototypical substituted zeolitic imidazolate framework, ZIF-8, by ball-milling.The resultant amorphous ZIF-8 (a m ZIF-8) possesses a continuous random network (CRN) topology with a higher density and a lower porosity than its crystalline counterpart.A decrease in thermal stability upon amorphization is also evident.

    Amorphization mechanisms of NiZr{sub 2} by ball-milling

    16-12-2020· The microstructure of NiZr{sub 2} in the course of amorphization by ball-milling is studied by transmission electron microscopy and x-ray diffraction. The evolution from the initial fully crystalline alloy to a fully amorphized material is described. It is shown that prior to amorphization, the

    Methods of amorphization and investigation of the

    22-10-2013· It provides advantages in terms of dissolution rate and bioavailability. This review presents the methods of solid- -state amorphization described in literature (supercooling of liquids, milling, lyophilization, spray drying, dehydration of crystalline hydrates), with the emphasis on milling.

    Research on Metastable Structures Using High Energy

    Amorphization by mechanical milling (MM), where a single composition (e.g. intermetallic compound) is milled requires the accumulation of defects to induce the transformation. It is concluded that anti-site chemical disorder and nanocrystalline grain boundaries are the important defects in this regard.

    Amorphization of single composition powders by

    28-12-2020· Of the various methods which have been used for over 30 years to prepare amorphous materials, such as vapor phase deposition and rapid solidification, mechanical grinding or milling has also been noted as another but much less studied technique. The intermetallic compounds which were amorphized by

    HRTEM and EELS Studies on the Amorphization of

    The amorphization kinetics are revealed by X‐ray diffractometry (XRD), high‐resolution transmission electron microscopy (HRTEM), and electron energy loss spectroscopy (EELS). HRTEM investigations indicate that, in the early stage of milling, the thick sp 2 layers are sliced into many thinner sheets because of cleavage along the basal planes.

    Surfactant Assisted Ball Milling: A Simple Top down

    In high-energy ball milling, The aim of this systematic review is to represent the basic concept and applications of mechanical milling in the surfactant assisted synthesis of various nanomaterial, Chin, T.P. Perng, Amorphization of Ni-Si-C ternary alloy powder by mechanical alloying, Mater Sci Forum. 235-238(1997)121-126.

    Mechanical Milling: a Top Down Approach for the Synthesis

    03-02-2012· ball milling as a non-equilibrium processing method which can be analogous to rapid solidification. This review will first describe the equipment and some of the process va-riables used for high energy ball milling. Next, the physics of the milling processes has been described to the extent

 

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