Effect of the addition of Fe2O3 and heat treatment duration on the magnetic susceptibility of V2O5-P2O5-B2O3 glass system

1992 ◽  
Vol 3 (3) ◽  
pp. 144-146 ◽  
Author(s):  
I. Kashif ◽  
H. Farouk ◽  
S. A. Aly ◽  
A. M. Sanad ◽  
M. H. El-Kottamy ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Magnetic Susceptibility ◽  
Treatment Duration ◽  
Glass System ◽  
Heat Treatment Duration ◽  
B2o3 Glass

Detailed study on the characterization of silver nanocluster in poly(methyl methacrylate)

1997 ◽  
Vol 501 ◽  
Author(s):  
Naohisa Yanagihara ◽  
Kazutaka Uchida ◽  
Muyuki Wakabayashi ◽  
Toru Hara
Keyword(s):  
Heat Treatment ◽  
Methyl Methacrylate ◽  
Treatment Duration ◽  
Bulk Polymerization ◽  
Visible Spectroscopy ◽  
Poly Methyl Methacrylate ◽  
Silver Nanocluster ◽  
Ag Cluster ◽  
Heat Treatment Duration

ABSTRACTSolid sol of silver in poly(methyl methacrylate), Ag/PMMA, was prepared by bulk polymerization of methyl methacrylate solution of silver (I) triflluoroacetate (AgTfa) and followed by postheating. The formation of the metallic Ag nanocluster was characterized by visible spectroscopy, and effects of the concentrations of AIBN and AgTfa and the heat-treatment duration on the formation of Ag cluster were investigated. Furthermore, based on the kinetic study of MMA in the presence of AgTfa, possible mechanism for the reduction and agglomeration of silver is proposed.

Physical, Mechanical and Micro-Structural Properties of F Type Fly-Ash Based Geopolymeric Bricks Produced by Pressure Forming Process

2010 ◽  
Vol 69 ◽  
pp. 69-74 ◽  
Author(s):  
Ömer Arıöz ◽  
Kadir Kilinç ◽  
Mustafa Tuncan ◽  
Ahmet Tuncan ◽  
Taner Kavas
Keyword(s):  
Heat Treatment ◽  
Compressive Strength ◽  
Fly Ash ◽  
Sodium Hydroxide ◽  
Sodium Silicate ◽  
Heat Treatment Temperature ◽  
Treatment Duration ◽  
Treatment Temperature ◽  
Alumino Silicate ◽  
Heat Treatment Duration

Geopolymer is a new class of three-dimensionally networked amorphous to semi-crystalline alumino-silicate materials, and first developed by Professor Joseph Davidovits in 1978. Geopolymers can be synthesized by mixing alumino–silicate reactive materials such as kaolin, metakaolin or pozzolans in strong alkaline solutions such as NaOH and KOH and then cured at room temperature. Heat treatment applied at higher temperatures may give better results. Depending on the mixture, the optimum temperature and duration vary 40-100 °C and 2-72 hours, respectively. The properties of geopolymeric paste depend on type of source material (fly ash, metakaolin, kaolin), type of activator (sodium silicate-sodium hydroxide, sodium silicate-potassium hydroxide), amount of activator, heat treatment temperature, and heat treatment duration. In this experimental investigation, geopolymeric bricks were produced by using F-type fly ash, sodium silicate, and sodium hydroxide solution. The bricks were treated at various temperatures for different hours. The compressive strength and density of F-type fly ash based geopolymeric bricks were determined at the ages of 7, 28 and 90 days. Test results have revealed that the compressive strength values of F-type fly ash based geobricks ranged between 5 and 60 MPa. It has been found that the effect of heat treatment temperature and heat treatment duration on the density of F-type fly ash based geobricks was not significant. It should be noted that the spherical particle size increased as the heat treatment temperature increased in the microstructure of F-type fly ash based geobricks treated in oven at the temperature of 60 °C for 24 hours.

Effect of heat treatment duration on the interaction between fish myosin and selected flavor compounds

2020 ◽  
Vol 100 (12) ◽  
pp. 4457-4463 ◽  
Author(s):  
Yongxia Xu ◽  
Rui Wang ◽  
Honglei Zhao ◽  
Yiming Yin ◽  
Xuepeng Li ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Treatment Duration ◽  
Flavor Compounds ◽  
Heat Treatment Duration

scholarly journals EFFICIENCY OF REINFORCEMENT OF TECHNOLOGICAL SOIL BY MINERAL MODIFIERS

2020 ◽  
pp. 115-125
Author(s):  
P. Dyakin ◽  
Yu. Pivinskiy ◽  
D. Prohorenkov ◽  
V. Doroganov
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Treatment Duration ◽  
Bending Strength ◽  
Effect Of Temperature ◽  
Firing Process ◽  
Ceramic Binder ◽  
Heat Treatment Duration ◽  
Composition Structure

The effect of temperature and duration of heat treatment of samples based on a highly concentrated ceramic binder suspension (HCBS) of a composite composition (bauxite + 11% VDKS), as well as with an additional content of 15% silicon carbide on their phase composition, structure, and some properties is studied. Long-term heat treatment (60 and 120 hours) in the temperature range 1300 - 1400 ° C is carried out in a tunnel kiln for firing dinas. In the process of heat treatment, the process of formation of secondary mullite, the oxidation of SiC followed by mullite formation, proceeds. The influence of the heat treatment duration on the phase composition, as well as the strength, apparent density, growth, SIC oxidation state, and bending strength of samples containing 15% SiC are characterized. It is found that the minimum porosity value (2.7 %) is observed when the heat treatment duration is 8 hours. This drop in porosity and a slight decrease in density is due to a certain degree of mullitization or SiC oxidation, but also to the formation of a significant volume of closed porosity. With increasing the duration of the firing process to 60 and 120 hours, the porosity indicators increase significantly, and the density decreases sharply.

The Effect of PVP Addition and Heat-treatment Duration on Zinc Oxide Nanoparticles

2006 ◽  
Vol 6 (6) ◽  
pp. 1298-1301 ◽  
Author(s):  
Ali Elkhidir Suliman ◽  
Yiwen Tang . ◽  
Zhan Xin . ◽  
Zhijie Jia .
Keyword(s):  
Heat Treatment ◽  
Zinc Oxide ◽  
Zinc Oxide Nanoparticles ◽  
Treatment Duration ◽  
Oxide Nanoparticles ◽  
Heat Treatment Duration

Effect of heat treatment duration on the thermal conductivity of spruce and poplar wood

2017 ◽  
Vol 75 (5) ◽  
pp. 843-845 ◽  
Author(s):  
Zoltán Pásztory ◽  
Norbert Horváth ◽  
Zoltán Börcsök
Keyword(s):  
Thermal Conductivity ◽  
Heat Treatment ◽  
Treatment Duration ◽  
Poplar Wood ◽  
Heat Treatment Duration

Hot Dip Aluminizing of 9Cr-1Mo Steels and their Heat Treatment

2015 ◽  
Vol 830-831 ◽  
pp. 143-146
Author(s):  
Jalpa Patel ◽  
Prashanth Huilgol ◽  
Nirav Jamnapura ◽  
K. Udaya Bhat
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Solid Solution ◽  
Reaction Layer ◽  
Treatment Duration ◽  
Substrate Material ◽  
X Ray ◽  
Heat Treated ◽  
Heat Treatment Duration ◽  
Scanning Electron

Coupons of 9Cr-1Mo steels of type SA 387 Grade 9 class 2 were hot dip aluminized using Al bath at a temperature of 700 °C for 30 seconds. The samples were further heat treated at 750 °C for durations of 1, 3 and 5 hours, respectively. The samples were characterized using X-ray diffractometry, scanning electron microscopy and energy dispersive spectroscopy. The investigation showed that as coated samples contain an aluminum top coat, a reaction layer and substrate material. Within the reaction layer, two distinct regions corresponding to Fe2Al5 and Fe4Al13 were identified. Chromium up to 2 at% was observed. After heat treatment Al coat was not existing. Two distinct layers, corresponding to a thick Fe2Al5 and a thin FeAl were observed at shorter heat treatment duration. Under longer heat treatment durations, multiple phases, namely, Fe2Al5, FeAl, Fe3Al and solid solution of Al in Fe were observed.

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