Structural and Microstructural Properties of Si-C and Si-C-B Powders Obtained by High-Energy Ball Milling

2016 ◽  
Vol 869 ◽  
pp. 19-24
Author(s):  
Lucas Moreira Ferreira ◽  
D.S. Mégda ◽  
A.C. de Souza ◽  
Rodrigo Fernando Costa Marques ◽  
Erika Coaglia Trindade Ramos ◽  
...  
Keyword(s):  
Ball Milling ◽  
Structural Modification ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Fracture Mechanisms ◽  
Microstructural Properties ◽  
X Ray Diffraction ◽  
Powder Mixtures ◽  
X Ray ◽  
Energy Ball

This work evaluated on the structural modification during high-energy ball milling of the Si-50C, Si-42.9C-19.1B e Si-33.3C-44.4B (at.-%) powder mixtures from elemental powders. Electron images revealed on occurrence of continuous fracture mechanisms in brittle particles during their processing, which presented rounded particles lower than 10 μm. X-ray diffraction results of Si-50C powders indicated that the intensity of Si peaks was slightly reduced after milling for 17 h, which were moved to the direction of larger diffraction angles after 7 h of milling, suggesting that carbon atoms were dissolved into the Si lattice in order to form an extended solid solution. Following, these values were increased due to the discrete exothermic formation of the SiC compound. In Si-C-B powder mixtures, the SiC and B4C compounds were formed after milling for 7 h.

X-ray diffraction study of microstructural evolution of some ZrO2–Y2O3–MgO powder mixtures induced by high-energy ball milling

2004 ◽  
Vol 379 (1-2) ◽  
pp. 216-221 ◽  
Author(s):  
Nada Stubičar ◽  
Vladimir Bermanec ◽  
Mirko Stubičar ◽  
Darko Popović ◽  
Wolfgang A. Kaysser
Keyword(s):  
Diffraction Study ◽  
Ball Milling ◽  
Microstructural Evolution ◽  
High Energy ◽  
High Energy Ball Milling ◽  
X Ray Diffraction ◽  
Powder Mixtures ◽  
X Ray ◽  
Energy Ball

Mössbauer, X-ray diffraction and magnetization studies of Fe–Mn–Al–Nb alloys prepared by high energy ball milling

2006 ◽  
Vol 168 (1-3) ◽  
pp. 1057-1063 ◽  
Author(s):  
Ligia E. Zamora ◽  
G. A. Perez Alcazar ◽  
J. M. Greneche ◽  
S. Suriñach
Keyword(s):  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
X Ray Diffraction ◽  
X Ray ◽  
Energy Ball

Microstructural Transformations of an Amorphous Fe90 Zr10 Alloy Induced by High-Energy Ball-Milling

2006 ◽  
Vol 510-511 ◽  
pp. 698-701
Author(s):  
Pyuck Pa Choi ◽  
Young Soon Kwon ◽  
Ji Soon Kim ◽  
Dae Hwan Kwon
Keyword(s):  
Ball Milling ◽  
Milling Time ◽  
High Energy ◽  
High Energy Ball Milling ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Melt Spun ◽  
Energy Ball ◽  
Induced Crystallization

Mechanically induced crystallization of an amorphous Fe90Zr10 alloy was studied by means of X-ray diffraction (XRD) and differential scanning calorimetry (DSC). Under high-energy ball-milling in an AGO-2 mill, melt-spun Fe90Zr10 ribbons undergo crystallization into BCC α- Fe(Zr). Zr atoms are found to be solved in the Fe(Zr) grains up to a maximum supersaturation of about 3.5 at.% Zr, where it can be presumed that the remaining Zr atoms are segregated in the grainboundaries. The decomposition degree of the amorphous phase increases with increasing milling time and intensity. It is proposed that the observed crystallization is deformation-induced and rather not attribute to local temperature rises during ball-collisions.

BBPPAmorphous Si-B-C-N Ceramics Fabricated by High Energy Ball Milling and Hot Pressing

2007 ◽  
Vol 353-358 ◽  
pp. 1505-1508
Author(s):  
Zhi Hua Yang ◽  
Yu Zhou ◽  
De Chang Jia ◽  
Qing Chang Meng ◽  
Chang Qing Yu
Keyword(s):  
Ball Milling ◽  
Hot Pressing ◽  
Hexagonal Boron Nitride ◽  
High Energy ◽  
High Energy Ball Milling ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Energy Ball ◽  
Amorphous Si

Amorphous Si-B-C-N ceramics obtained by high energy ball milling and hot pressing using hexagonal boron nitride (h-BN), graphite (C) and amorphous Si as starting materials have been studied. The mechanical milling with high energy resulted in the generation of large amounts of amorphous composites only milled for 5 h. Si-B-C-N powders were consolidation by hot pressing at 1850 °C. X-ray diffraction (XRD) and transmission electron microscopy (TEM) show that small amount of BN and SiC crystal lies in the amorphous matrix. The flexural strength reached the maximal value of 137.2 MPa at a mole ratio of BN/(Si+C) being 0.6.

Preparation of C/Cu Composite Powders by High-Energy Ball-Milling

2011 ◽  
Vol 319-320 ◽  
pp. 61-63 ◽  
Author(s):  
Xiu Yan Guo ◽  
Guo Jin Ma ◽  
Shi Kun Xie ◽  
Rong Xi Yi ◽  
Zhi Gao
Keyword(s):  
Ball Milling ◽  
Graphite Powder ◽  
High Energy ◽  
Lattice Parameter ◽  
High Energy Ball Milling ◽  
X Ray Diffraction ◽  
Composite Powders ◽  
Mixed Powder ◽  
X Ray ◽  
Energy Ball

Cu-4% mixed-powder consisting of rough copper powder and graphite powder was separately mechanical alloyed by high-energy ball milling. The phases and micrograph of these powders were determined by X-ray diffraction and scanning electron microscopy (SEM). The results show an increase in the lattice parameter of copper with milling times, up to a saturation value of about 24h; There was an absence of graphite reflections from X-ray diffractograms after longer milling times.

In Situ Synthesis of TiC-TiB2 Composites via High Energy Ball Milling and Pressureless Sintering

2013 ◽  
Vol 401-403 ◽  
pp. 635-638
Author(s):  
Ping Luo ◽  
Shi Jie Dong ◽  
Zhi Xiong Xie ◽  
Wei Yang ◽  
An Zhuo Yangli
Keyword(s):  
Ball Milling ◽  
Milled Powder ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Sintering Process ◽  
Composite Ceramics ◽  
X Ray Diffraction ◽  
Powder Mixtures ◽  
Energy Ball

TiC-TiB2 composite ceramics were successfully fabricated via planetary ball milling of 72 mass% Ti and 28 mass % B4C powders, followed by low temperature sintering process at 1200°C. The microstructure of the ball-milled powder mixtures and composite ceramics were characterized by Differential thermal analysis equipment (DTA), field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD). The results showed that the ball-milled powder mixtures (Ti and B4C powders) were completely transformed to TiC-TiB2 composite ceramics as the powders were milled for 60 h and sintered at 1200°C for 1 h. The formation mechanism of the TiC-TiB2 composite was discussed. The high energy ball milling and necessary sintering for the powder mixtures plays an important role in the formation of the composites.

Corrosion Behavior and Hardness of Binary Mg Alloys Produced via High Energy Ball-Milling and Subsequent Spark Plasma Sintering

CORROSION ◽  
10.5006/3633 ◽  
2020 ◽  
Author(s):  
Mohammad Umar Farooq Khan ◽  
Taban Larimian ◽  
Tushar Borkar ◽  
Rajeev Gupta
Keyword(s):  
Ball Milling ◽  
Spark Plasma Sintering ◽  
Corrosion Behavior ◽  
High Energy ◽  
High Energy Ball Milling ◽  
X Ray Diffraction ◽  
X Ray ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Energy Ball

ABSTRACT In this work, nine nanocrystalline binary Mg alloys synthesized by high energy ball milling. The compositions, Mg-5wt.%M (M- Cr, Ge, Mn, Mo, Ta, Ti, V, Y, Zn) were milled with an objective of achieving non-equilibrium alloying. The milled alloys were consolidated via cold compaction (CC) at 25 ï‚°C and spark plasma sintering (SPS) at 300 ï‚°C. X-ray diffraction (XRD) analysis indicated grain refinement below 100 nm, and the scanning electron microscopy revealed homogeneous microstructures for all compositions. X-ray diffraction analysis revealed that most of the alloys showed a change in the lattice parameter, which indicates the formation of a solid solution. A significant increase in the hardness compared to unmilled Mg was observed for all the alloys. The corrosion behavior was improved in all the binary alloys compared to milled Mg. A significant decrease in the cathodic kinetics was evident due to Ge and Zn additions. The influence of the alloying elements on corrosion behavior has been categorized and discussed based on the electrochemical response of their respective binary Mg alloy.

Nanostructure Evolution Evolution of Expanded Graphite during High-Energy Ball-Milling and Subsequently Annealing

2014 ◽  
Vol 552 ◽  
pp. 331-334
Author(s):  
Zhi Guo Liu
Keyword(s):  
Ball Milling ◽  
Expanded Graphite ◽  
High Energy ◽  
High Energy Ball Milling ◽  
X Ray Diffraction ◽  
X Ray ◽  
Air Atmosphere ◽  
Vacuum Atmosphere ◽  
Energy Ball ◽  
Crystallization Degree

Expanded graphite (EG) was ball-milled in a high-energy mill (planetary-type) under an air atmosphere and subsequently annealed under a vacuum atmosphere. The products were characterized by X-ray diffraction (XRD). The results show that the ball-milling decreases the crystallization degree of EG, however, the subsequent annealing improves the crystallization degree of the ball-milled EG.

Microstructural Characterization of 66%Co-28%Cr-6%Mo Dental Alloy Powder Obtained by High-Energy Ball Milling

2014 ◽  
Vol 802 ◽  
pp. 51-55 ◽  
Author(s):  
Claudinei dos Santos ◽  
Alexandre Fernandes Habibe ◽  
Durval Rodrigues ◽  
José C. Minatti ◽  
Jefferson Fabrício C. Lins ◽  
...  
Keyword(s):  
Ball Milling ◽  
Average Particle Size ◽  
Microstructural Characterization ◽  
High Energy ◽  
Inert Atmosphere ◽  
High Energy Ball Milling ◽  
Average Particle ◽  
X Ray Diffraction ◽  
X Ray ◽  
Energy Ball

In this work, the microstructural features of the particles based on 66% Co-28% Cr-6% Mo alloy, were investigated by X-ray diffraction and Scanning electron microscopy (SEM). Powders obtained by high-energy ball milling in an inert atmosphere, and held in SPEX mill with times between 15min and 120min, about ball/powder ratio of 6:1, were characterized by X-ray diffraction indicating in all conditions, Co phase as the crystalline phase of the system. The powders have a morphology that indicate a continuous reduction in average particle size as a function of increasing time, however, the shape of the particles initially flat for times up to 30 minutes, becomes spherodized after 30 minutes of grinding.

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