Structural and particle size characteristics of lithium carbonate after mechanical activation and heat treatment

2015 ◽  
Vol 51 (4) ◽  
pp. 345-350 ◽  
Author(s):  
V. P. Isupov ◽  
N. V. Bulina ◽  
N. V. Eremina
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Mechanical Activation ◽  
Lithium Carbonate

Intermetallic Effects on the Ductility of Sintered Aluminium

2008 ◽  
Vol 587-588 ◽  
pp. 380-384
Author(s):  
Jesus Cintas ◽  
José A. Rodríguez ◽  
Francicso Gomez Cuevas ◽  
José M. Gallardo
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Intermetallic Particle ◽  
Quantitative Metallography ◽  
Mechanically Alloyed ◽  
Aluminium Powder ◽  
Attrition Milling ◽  
Different Temperatures ◽  
Alloyed Aluminium ◽  
Milled Powders

Mechanically alloyed aluminium powder was prepared by attrition-milling for 10 hours in the presence of a wax. Milled powders were annealed in vacuum at different temperatures (500, 575, 600, 625 and 650°C). Compacts were consolidated starting from unannealed and from 600°Cannealed powders. Studies by SEM microfractography and quantitative metallography, to investigate the influence of Fe-Al intermetallics on compacts fracture, have been carried out. It is concluded that fracture takes place at regions where the area occupied by the intermetallics is high and intermetallics particles are big. Intermetallic particle size can be controlled by an appropriated heat treatment.

scholarly journals Modulation of Lithium Disilicate Translucency through Heat Treatment

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2094
Author(s):  
Seok-Ki Jung ◽  
Dae Woon Kim ◽  
Jeongyol Lee ◽  
Selvaponpriya Ramasamy ◽  
Hyun Sik Kim ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Light Scattering ◽  
Flexural Strength ◽  
Control Method ◽  
Light Transmission ◽  
Lithium Disilicate ◽  
Lower Heat ◽  
Average Size ◽  
Ball Test

The aim of this study was to present a control method for modulating the translucency of lithium disilicate ceramics through thermal refinement. Identical lithium disilicate blocks were thermally refined using four different heat treatment schedules, and the microstructure, translucency, and flexural strength of the ceramics were investigated in detail by SEM, spectroscopy, and a piston-on-three-ball test. The results showed that ceramics treated under higher heat had larger grains, with an average size between 240 and 1080 nm. In addition, a higher transmittance of all wavelengths was observed in ceramics treated under lower heat, and the transmittance in the 550 nm wavelength ranged from 27 to 34%. The results suggest that the translucency of ceramics can be modified through thermal refinement under two conditions: (1) the particle size of the ceramic is small enough to achieve minimal grain-boundary light scattering, and (2) the percentage of particles allowing visible light transmission is altered by the heat treatment.

Preparation of La0.75Sr0.25Cr0.5Mn0.5O3-δ Nanometer Powders by Sol-Gel Method and Research about its Electrochemical Performance

2013 ◽  
Vol 712-715 ◽  
pp. 257-261
Author(s):  
Yin Lin Wu ◽  
Qing Hui Wang ◽  
Ling Wang ◽  
Hai Yan Zhao
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Electrochemical Performance ◽  
Heat Treatment Temperature ◽  
Sol Gel ◽  
Treatment Temperature ◽  
Preparation Process ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ft Ir

The La0.75Sr0.25Cr0.5Mn0.5O3-δnanometer powders were prepared by citric acid sol-gel method.The samples were characterized by DTA, FT-IR, XRD, TEM techniques. The preparation process, morphology of synthesized powders, the best heat-treatment temperature and the electrochemical performance had been studied. The results show that the spherical nanometer powders can be obtained and the best heat-treatment temperature is 800°C. The particle size is about 30nm and Ea is 0.071 eV.

Complex Activation of Coal Gangue to Al Compounds

2011 ◽  
Vol 402 ◽  
pp. 734-737
Author(s):  
Shu Hong Liu ◽  
Xi Jie Lan ◽  
Hong Gao
Keyword(s):  
Particle Size ◽  
Mechanical Activation ◽  
Acid Medium ◽  
Particle Size Analysis ◽  
Coal Gangue ◽  
Size Analysis ◽  
Calcine Temperature ◽  
Processing Effects

The coal gangue was activated by calcine activation, calcine activation + mechanical activation (MA) complex activation. From the results of O2-TPO-MS and Ar-TPR-MS, we can speculate the reactions occurred during the coal gangue calcine activation processing. Effects of calcine temperature, calcine activation + MA complex activation, kinds of acid on the extraction percent of Al were investigated. The results of the extraction percent of Al and particle size analysis show that calcine (400~600 oC) activation and calcine (400~600 oC) + MA complex activation can enhance the extraction percent of Al and decrease the particle size. Much higher extraction percent of Al can be obtained with H2SO4 as acid medium than with HCl as acid medium for the coal gangue activated with the same condition.

Effect of Mechanical Activation on Reaction between Boehmite and Lithium Carbonate

2020 ◽  
Vol 56 (1) ◽  
pp. 56-61 ◽  
Author(s):  
V. P. Isupov ◽  
I. A. Borodulina ◽  
K. B. Gerasimov ◽  
N. V. Bulina
Keyword(s):  
Mechanical Activation ◽  
Lithium Carbonate

Novel Methods for Preparation and Surface Treatment of Nano-CaCO3

2013 ◽  
Vol 750-752 ◽  
pp. 336-339
Author(s):  
Fa Chao Wu ◽  
Teng Fei Shen
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Particle Size ◽  
Fourier Transform ◽  
Room Temperature ◽  
Transmission Electron ◽  
Reduce Energy Consumption ◽  
Scanning Electron

In this work, CaCO3 nanoparticles have been synthesized via heat-treatment of a new precursor. Effect of calcinations temperature on particle size has been investigated. The products were characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). nanoCaCO3 was modified using chloroform as solvent and fatty acid as modifier atroom temperature. The advantage of this modification is that it can be proceed at room temperature and it can reduce energy consumption.

Preparation and Impaction on the Yield and Abrasion Resistance of Polycrystalline Diamond Powder of Copper/Graphite Raw Materials

2012 ◽  
Vol 550-553 ◽  
pp. 93-98
Author(s):  
Chun Lin Li ◽  
Jian Chen
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Abrasion Resistance ◽  
Heat Treatment Temperature ◽  
Copper Content ◽  
Raw Materials ◽  
Polycrystalline Diamond ◽  
Graphite Powder ◽  
Diamond Powder ◽  
Treatment Temperature

Taking earthy graphite and electrolytic powder as raw materials, copper/graphite raw material is prepared by power metallurgy and then polycrystalline diamond powder is prepared by shock wave synthesis. Impaction on yield and abrasion resistance from copper content, particle size of graphite powder, heat treatment and re-pressing process has been researched. As result, yield of polycrystalline diamond powder is decreasing as decreasing copper content. It is decreased dramatically when the copper content is less than 90%. It is increased and then decreased as increasing the particle size of graphite powder, and the better particle size of graphite powder is 70μm. It is increased slightly and then decreased dramatically as increasing heat treatment temperature before re-pressing. The higher the heat treatment temperature, the more the yield after re-pressing. Impaction on the abrasion resistance of polycrystalline diamond powder from the preparing process of copper/graphite is smaller.

scholarly journals The influence of lithium carbonate on the heat release during the hydration of Portland cement at the temperature 40°C

2019 ◽  
Vol 265 ◽  
pp. 01011
Author(s):  
Anisa Kuzina ◽  
Ekaterina Shokodko ◽  
Andrey Pustovgar ◽  
Aleksey Adamtsevich
Keyword(s):  
Heat Treatment ◽  
Energy Efficiency ◽  
Heat Flow ◽  
Portland Cement ◽  
Heat Release ◽  
Precast Concrete ◽  
Isothermal Calorimetry ◽  
Exothermic Reaction ◽  
Lithium Carbonate ◽  
Cement Binder

This work represents the stage of the author's research aimed at identifying the solutions for increasing the energy efficiency of the production of precast concrete and reinforced concrete products and structures in plant conditions due to reducing the temperature of heat treatment, or due to the reduction of duration of this technological process. The work provides results of the research of the influence of the admixture of lithium carbonate (Li2CO3) on the dynamics of hydration process of the binding systems on a cement basis in the conditions of the increased temperature (40°C). The research was performed using the method of isothermal calorimetry on the two various samples of the cement binder, conducted in various countries. The Li2CO3 admixture is accepted in dosages from 0.5% to 2.5%. The graphical dependence of the heat flow of the exothermic reaction of hydration on the used lithium carbonate dosage in the first days of curing of the samples is established and presented.

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