Mechanochemical Reaction Between Sulfur and Ilmenite

An ilmenite (FeTiO3) concentrate has been milled with sulfur in a laboratory-scale ball mill for 100 h under a variety of conditions. X-Ray diffraction and thermal processing have shown that reaction occurs within the mill forming pyrite (FeS2) and rutile (TiO2). The reaction was of greatest extent in a mill run under 400 kPa of inert gas; some reaction occurred in a mill under 10-2 Pa, whereas little reaction was observed when either water or air was present. Annealing of the product powders showed that reaction to TiO2 and FeS2 could be achieved in a closed system after 1 h at 400C but with the evolution of SO2, whereas annealing at 800C also gave TiO2 and FeS2, but without formation of SO2 which was thought to have disproportionated to form iron sulfate(VI). Closed-tube annealing of unmilled sulfur and milled ilmenite showed the same reactions as milled powders but of much greater extent.

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Tribological Behavior of Mesophase Carbon Added with Titanium and Copper

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.80-81.60 ◽

2011 ◽

Vol 80-81 ◽

pp. 60-63

Author(s):

Xue Qing Yue ◽

Hua Wang ◽

Shu Ying Wang

Keyword(s):

Wear Resistance ◽

High Temperature ◽

Friction Coefficient ◽

Ball Mill ◽

Friction And Wear ◽

Applied Load ◽

Tribological Behavior ◽

Metallic Elements ◽

X Ray Diffraction ◽

X Ray

Incorporation of metallic elements, titanium and copper, into carbonaceous mesophase (CM) was performed through mechanical alloying in a ball mill apparatus. The structures of the raw CM as well as the Ti/Cu-added CM were characterized by X-ray diffraction. The tribological behavior of the Ti/Cu-added CM used as lubricating additives was investigated by using a high temperature friction and wear tester. The results show that, compared with the raw CM, the Ti/Cu-added CM exhibits a drop in the crystallinity and a transition to the amorphous. The Ti/Cu-added CM used as lubricating additive displays an obvious high temperature anti-friction and wear resistance effect, and the lager the applied load, the lower the friction coefficient and the wear severity.

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Novel Multilayer Process for CuInSe2 Thin Film Formation by Rapid Thermal Processing

MRS Proceedings ◽

10.1557/proc-485-163 ◽

1997 ◽

Vol 485 ◽

Cited By ~ 2

Author(s):

Chih-hung Chang ◽

Billy Stanbery ◽

Augusto Morrone ◽

Albert Davydov ◽

Tim Anderson

Keyword(s):

Thermal Processing ◽

Physical Vapor Deposition ◽

Film Formation ◽

Rapid Thermal Processing ◽

Precursor Film ◽

Bilayer Structure ◽

X Ray Diffraction ◽

X Ray ◽

Deposition Parameters ◽

Cuinse2 Thin Film

AbstractCuInSe2 thin films have been synthesized from binary precursors by Rapid Thermal Processing (RTP) at a set-point temperature of 290°C for 70 s. With appropriate processing conditions no detrimental Cu2-xSe phase was detected in the CIS films. The novel binary precursor approach consisted of a bilayer structure of In-Se and Cu-Se compounds. This bilayer structure was deposited by migration enhanced physical vapor deposition at a low temperature (200°C) and the influence of deposition parameters on the precursor film composition was determined. The bilayer structure was then processed by RTP and characterized for constitution by X-ray diffraction and for composition by Wavelength Dispersive X-ray Spectroscopy.

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Effect of Nickel on Titanium Carbide Synthesized via Tungsten Inert Gas (TIG) Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.620.384 ◽

2012 ◽

Vol 620 ◽

pp. 384-388

Author(s):

Sharifah Aishah Syed Salim ◽

Julie Juliewatty Mohamed ◽

Zainal Arifin Ahmad ◽

Zainal Arifin Ahmad

Keyword(s):

Electron Microscope ◽

Scanning Electron Microscope ◽

Powder Mixture ◽

Raw Material ◽

Inert Gas ◽

X Ray Diffraction ◽

X Ray ◽

Arc Melting ◽

Elemental Powder Mixture ◽

Scanning Electron

Numerous methods have been used to produce high purity TiC. There is no previous study has been reported on the formation using single elemental powders of Titanium (Ti) and Carbon (C) with addition Nickel (Ni) by tungsten inert gas (TIG) weld method. In this work, TiC was synthesized via TIG method by arc melting elemental powder mixture of Ti and C at ~5 second (s) and 80 ampere (A). The effect Ni contents on TiC formation was investigated. The mixed raw material was ball milled for 24 hours followed by synthesis via TIG method. The arced samples were characterized by X-ray diffraction (XRD) and Scanning electron microscope (SEM). It was revealed, that small amount of Ni additive to the metal powder allows the production of dense and tough TiC.

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Structural Evaluation of Ti-22.2Si-11.1B Powders Milled with PCA Addition

Materials Science Forum ◽

10.4028/www.scientific.net/msf.591-593.147 ◽

2008 ◽

Vol 591-593 ◽

pp. 147-153

Author(s):

Gilbert Silva ◽

Erika Coaglia Trindade Ramos ◽

N.S. da Silva ◽

Alfeu Saraiva Ramos

Keyword(s):

Electron Microscopy ◽

Ball Milling ◽

Ball Mill ◽

Milling Process ◽

Argon Atmosphere ◽

X Ray Diffraction ◽

X Ray ◽

Structural Evaluation ◽

Equilibrium Structures ◽

Scanning Electron

A large amount of the Ti6Si2B compound can be formed by mechanical alloying and subsequent heat treatment from the elemental Ti-22.2at%Si-11.1at%B powder mixture, but the yield powder after ball milling is reduced due to an excessive agglomeration of ductile particles on the balls and vial surfaces. This work reports on the structural evaluation of Ti-22.2at%Si-11.1at%B powders milled with PCA addition, varying its amount between 1 and 2 wt-%. The milling process was carried out in a planetary ball mill under argon atmosphere, and the milled powders were then heated at 1200oC for 1h under Ar atmosphere in order to obtain equilibrium structures. Samples were characterized by X-ray diffraction, scanning electron microscopy, and thermal analysis. Results revealed that the PCA addition reduced the excessive agglomeration during the ball milling of Ti-22.2at-%Si-11.1at-%B powders. After heating at 1200oC for 1h, the Ti5Si3, Ti3O and/or Ti2C phases were preferentially formed in Ti-22.2at%Si-11.1at%B powders milled with PCA addition, and the Ti6Si2B formation was inhibited.

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Влияние режима получения образцов и термообработки на локальную структуру халькогенидного полупроводника Ge-=SUB=-2-=/SUB=-Sb-=SUB=-2-=/SUB=-Te-=SUB=-5-=/SUB=-

Физика и техника полупроводников ◽

10.21883/ftp.2022.03.52113.9744 ◽

2022 ◽

Vol 56 (3) ◽

pp. 291

Author(s):

С.Н. Гарибова ◽

А.И. Исаев ◽

С.И. Мехтиева ◽

С.У. Атаева ◽

Р.И. Алекперов

Keyword(s):

Heat Treatment ◽

Thermal Processing ◽

Thermal Evaporation ◽

Amorphous State ◽

Hexagonal Structure ◽

Structural Elements ◽

X Ray Diffraction ◽

X Ray ◽

The Matrix ◽

Close Range

Specifics of "amorphous state - crystal" phase transitions in dependence on the samples obtaining method and thermal processing, as well as changes in the structure and close range order in the arrangement of the atoms of Ge20Sb20.5Te51 chalcogenide semiconductors have been studied by the x-ray diffraction and Raman spectroscopy. It has been shown that Ge20Sb20.5Te51 films obtained by thermal evaporation on an unheated substrate are amorphous; after heat treatment at 220 and 400 °C, transform into a crystalline phase with a cubic and hexagonal structure. The chemical bonds and the main structural elements that form the matrix of the investigated objects, as well as the changes that occur in them during heat treatment, have been determined.

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Analysis of residual stress in metal-inert-gas-welded Al-2024 using neutron and synchrotron X-ray diffraction

Materials Science and Engineering A ◽

10.1016/j.msea.2008.01.085 ◽

2008 ◽

Vol 491 (1-2) ◽

pp. 248-257 ◽

Cited By ~ 14

Author(s):

S. Ganguly ◽

V. Stelmukh ◽

L. Edwards ◽

M.E. Fitzpatrick

Keyword(s):

Residual Stress ◽

Inert Gas ◽

X Ray Diffraction ◽

X Ray ◽

Al 2024

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Prepared and Microwave-Absorption Properties of BN Coated Ni Nanocapsules

Materials Science Forum ◽

10.4028/www.scientific.net/msf.663-665.1252 ◽

2010 ◽

Vol 663-665 ◽

pp. 1252-1255 ◽

Cited By ~ 2

Author(s):

Gui Mei Shi ◽

Shu Lian ◽

Ge Song ◽

Jin Bing Zhang

Keyword(s):

Reflection Loss ◽

Electromagnetic Properties ◽

Mechanochemical Reaction ◽

Network Analyzer ◽

Absorber Thickness ◽

X Ray Diffraction ◽

Absorption Properties ◽

Microwave Absorption Properties ◽

X Ray ◽

Transmission Electron

BN coated Ni nanocapsules were prepared by arc evaporating Ni-B amorphous alloy powders synthesized by a mechanochemical reaction, and their microstructure, surface component as well as electromagnetic properties (2-18 GHz) were investigated by means of high-resolution transmission electron microscopy, X-ray diffraction , photoluminescence spectra (PL) and a network analyzer, respectively. The reflection loss R (dB) of the nanocapsules less than -20 dB was obtained in the frequency range of 4.3-18 GHz for an absorber thickness of 1.4-6 mm. An optimal reflection loss of -32.0 dB was reached at 13 GHz with an absorber thickness of 2 mm. The microwave absorptive mechanisms of BN-coated Ni nanocapsule absorbent were discussed.

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Post-Synthesis Crystallinity Tailoring of Water-Soluble Polymer Encapsulated CdTe Nanoparticles using Rapid Thermal Annealing

MRS Proceedings ◽

10.1557/proc-1207-n03-08 ◽

2009 ◽

Vol 1207 ◽

Author(s):

Steven Rutledge ◽

Abdiaziz A. Farah ◽

Jordan Dinglasan ◽

Darren Anderson ◽

Anjan Das ◽

...

Keyword(s):

Thermal Processing ◽

Water Soluble ◽

Hollow Core ◽

X Ray Diffraction ◽

Water Soluble Polymer ◽

X Ray ◽

Crystal Fiber ◽

Cdte Nanoparticles ◽

Post Synthesis ◽

Polymer Capping

AbstractThe crystallinity of colloidal CdTe nanoparticles has been enhanced post synthesis. This control over the nanoparticles’ properties has been achieved using non-adiabatic thermal processing. The technique preserves the polymer capping and hence introduces no adverse effects on the nanoparticles’ optical properties. The crystallinity is probed primarily through Raman spectroscopy in a hollow core photonic crystal fiber and x-ray diffraction powder studies.

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SYNTHESIS AND CHARACTERIZATION OF NANOCRYSTALLINE FeNi AND Ni3Fe ALLOYS

International Journal of Modern Physics B ◽

10.1142/s0217979211058377 ◽

2011 ◽

Vol 25 (07) ◽

pp. 1013-1019 ◽

Cited By ~ 3

Author(s):

S. AZADEHRANJBAR ◽

F. KARIMZADEH ◽

M. H. ENAYATI

Keyword(s):

Ball Mill ◽

Morphological Evolution ◽

Lattice Parameter ◽

Internal Stresses ◽

Alloy Formation ◽

X Ray Diffraction ◽

X Ray ◽

Powder Particles ◽

Fe Alloys

Nanocrystalline FeNi and Ni 3 Fe alloys were prepared by mechanical alloying of Fe and Ni elemental powders using a planetary ball mill under protection atmosphere. X-ray diffraction measurements were performed to follow alloy formation process in these alloys. A heat treatment of 1 h at 800°C was carried out to relax the internal stresses of the milled samples. Morphological evolution of powder particles was revealed by scanning electron microscopy. The value of lattice parameter was reached to 0.35762 nm and the hardness was found to be 686 HV at 30 h milled FeNi powder. In the case of Ni 3 Fe the values of 0.3554 nm and 720 HV were obtained for lattice parameter and hardness, respectively.

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