Preparation and Characterization of Golden-Colored Pigments Based on Silver Coated with Metal Oxides

2008 ◽  
Vol 47-50 ◽  
pp. 1462-1465
Author(s):  
Yuko Tateishi ◽  
Hisahiro Einaga ◽  
Yasutake Teraoka
Keyword(s):  
Heat Treatment ◽  
Silver Powder ◽  
Base Material ◽  
Treatment Temperature ◽  
Metal Species ◽  
Color Tone ◽  
Metallic Luster ◽  
Golden Color ◽  
Loading Amount

The present study aimed at the development of new artificial golden-colored pigments which are thermally stable up to 900 oC and can be used for coloring ceramics wares. Silver was used as a base material with bright metallic luster. Silver with the larger lamellar structure was indispensable to maintain the metallic luster, and it was successfully obtained by the heat-treatment of as-obtained silver powder at 200-400 oC in air and subsequently dry ball-milling at 300 rpm for 1 h. The surface of the lamellar-structured silver was coated with small particles of hydroxides, oxyhydroxides and oxides of Fe, Co, Ni, Ce and Pr. Appearance of golden color depended on the combination of metal species and heat-treatment temperature, and CeO2-coated silver gave golden color after calcination at 800 and 900 oC. The golden color of CeO2-coated silver could be controlled by the loading amount and particle size of CeO2 for color tone and relative area of naked surface of Ag for luster.

Neodymium Incorporation in Zirconolite-Based Glass-Ceramics

2000 ◽  
Vol 663 ◽  
Author(s):  
P. Loiseau ◽  
D. Caurant ◽  
N. Baffier ◽  
C. Fillet
Keyword(s):  
Heat Treatment ◽  
Glass Ceramics ◽  
Fission Products ◽  
Treatment Temperature ◽  
Spent Fuel ◽  
X Ray Diffraction ◽  
Parent Glass ◽  
X Ray ◽  
Spin Resonance

ABSTRACTThe investigations on enhanced reprocessing of nuclear spent fuel, and notably on separating the long-lived minor actinides, such as Am and Cm, from the other fission products have led to the development of highly durable specific matrices such as glass-ceramics for their immobilization. This study deals with the characterization of zirconolite (CaZrTi2O7) based glass-ceramics synthesized by devitrification of an aluminosilicate parent glass. Trivalent actinide ions were simulated by neodymium, which is a paramagnetic local probe. Glass-ceramics with Nd2O3 contents ranging from 0 to 10 weight % were prepared by heat treatment of a parent glass at two different growth temperatures: 1050° and 1200°C. X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX) and electron spin resonance (ESR) measurements clearly indicate that Nd3+ ions are partly incorporated in zirconolite crystals formed in the bulk of the glass-ceramic samples. The amount of neodymium in the crystalline phase was estimated using ESR results and was found to decrease with increasing either heat treatment temperature or total Nd2O3 content.

Fabrication and Characterization of Photocatalyst Coatings by Heat Treatment in Carbon Powder for TiC Coatings

2017 ◽  
Vol 263 ◽  
pp. 137-141
Author(s):  
Su Jun Guan ◽  
Liang Hao ◽  
Hiroyuki Yoshida ◽  
Hiroshi Asanuma ◽  
Fu Sheng Pan ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Oxygen Vacancies ◽  
Treatment Temperature ◽  
Carbon Powder ◽  
Treatment Conditions ◽  
Fabrication And Characterization ◽  
Mechanical Coating

Photocatalyst coatings on alumina (Al2O3) balls had been successfully fabricated by mechanical coating technique, with titanium carbide (TiC) powder and subsequent heat treatment in carbon powder. The effect of heat treatment conditions in carbon powder on the formed compounds, surface morphology and photocatalytic activity of photocatalyst coatings was investigated. XRD results show that the formed compounds change with increasing the heat treatment temperature in carbon powder, and rutile TiO2 on the surface of TiC coatings at 1073 K and 1173 K. The generated oxygen vacancies confirmed by XPS measurement, are in favor of narrowing band gap to enhance the visible-light photocatalytic activity of photocatalyst coatings. The photocatalytic activity of photocatalyst coatings has been effectively enhanced, and the samples fabricated at 1073 K and 1173 K for 2 h show higher activity. The fabrication strategy provides us a facile preparation procedure of visible-light responsive photocatalyst coatings.

Raman spectroscopic characterization of submicron vapor-grown carbon fibers and carbon nanofibers obtained by pyrolyzing hydrocarbons

1999 ◽  
Vol 14 (12) ◽  
pp. 4474-4477 ◽  
Author(s):  
M. Endo ◽  
K. Nishimura ◽  
Y. A. Kim ◽  
K. Hakamada ◽  
T. Matushita ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Raman Spectroscopy ◽  
Carbon Nanofibers ◽  
Carbon Fibers ◽  
Spectroscopic Characterization ◽  
Treatment Temperature ◽  
Two Dimensional ◽  
Raman Spectroscopic ◽  
Main Transition

Variations of the properties of submicron vapor-grown carbon fibers (VGCFs) and nanofibers, with diameters around 0.1–0.2 μm and 80–100 nm, respectively, are observed by Raman spectroscopy as a function of heat-treatment temperature. The microstructural evolution strongly depends on the original properties of the material, such that the main transition temperatures associated with the onset for establishing two-dimensional graphene ordering are defined below 1500 °C for the nanofibers and 2000 °C for the submicron VGCFs, respectively. The relative intensities (ID/IG) of the as-grown phase for submicron VGCFs and nanofibers are 3.44 and 1.35, while those for the corresponding graphitized samples are 0.393 and 0.497, respectively.

Influence of Heat Treatment on Glaze Melting Characteristics

2011 ◽  
Vol 284-286 ◽  
pp. 1393-1396
Author(s):  
Tian Fei Ma ◽  
Guo Qi Liu ◽  
Jian Bin Yu ◽  
Wen Gang Yang
Keyword(s):  
Heat Treatment ◽  
Melting Temperature ◽  
Heat Treatment Temperature ◽  
Softening Point ◽  
Base Material ◽  
High Heat ◽  
Treatment Temperature ◽  
Temperature Range ◽  
Melting Characteristics ◽  
High Heat Treatment Temperature

Using SiO2– Al2O3– B2O3– K2O – Na2O system glaze as base material, under different temperature, sintering states of glaze were test. The influence of heat treatment on glaze melting characteristics was study. The results show that high heat treatment temperature can debase softening point, raise flow point, extend melting temperature range, long heat treatment time.has little effect on glaze melting characteristics.

Luminance Characterization of La3Ga5SiO14 Thin Films by Sputtering Deposition

2007 ◽  
Vol 539-543 ◽  
pp. 3514-3519
Author(s):  
Yi Hu ◽  
Feng Wei Wang ◽  
Hur Lon Lin
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
Crystalline Phase ◽  
Heat Treatment Temperature ◽  
Luminescent Properties ◽  
Treatment Temperature ◽  
Emission Peak ◽  
Sputtering Deposition ◽  
The Relationship

La3Ga5SiO14 (LGS) thin films were grown on (200)-textured MgO buffer layer, which was deposited on the silicon wafer, by sputtering at 600°C. These thin films were annealed and transformed form amorphous to the LGS crystalline phase with the heat treatment temperature higher than 1150°C. It was found that the films with LGS crystalline phase showed luminescent characterization whereas the LGS sintered solids did not. The emission peak of the films was found to be 438 nm under the excited light of λex=300nm. Effects of annealed temperature on the luminescent properties of the thin films are investigated. The relationship between the mechanism of luminescence and the crystalline structure of the LGS films are discussed.

Preparation and Characterization of β-Eucryptite Glass Ceramics

2012 ◽  
Vol 624 ◽  
pp. 134-137 ◽  
Author(s):  
Ping Zhai ◽  
Xiao Feng Duan ◽  
Da Qian Chen ◽  
Chong Hai Wang
Keyword(s):  
Heat Treatment ◽  
Expansion Coefficient ◽  
Heat Treatment Temperature ◽  
Glass Ceramics ◽  
Treatment Temperature ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
Solid Reaction ◽  
X Ray

In this paper, β-eucryptite glass ceramics were synthesized by using solid reaction method. Phase constitution, structure and properties of the material were studied by X-ray diffraction (XRD) and differential thermal analysis (DTA). Furthermore, the effects of heat treatment temperature and preservation time on the thermal expansion coefficient were also analyzed. The results showed that the crystallization temperature of β-eucryptite glass ceramics was in the range of 810-860 °C and the content was more than 90%. With the increase of heat treatment temperature, the material expansion coefficient decreased.

Effect of Heat Treatment Temperature and Atmosphere on Micro Structure of Polyphenylcarbosilane

2011 ◽  
Vol 695 ◽  
pp. 239-242
Author(s):  
Woo Teck Kwon ◽  
Soo Ryong Kim ◽  
Jong II Kim ◽  
Yoon Joo Lee ◽  
Ramesh R. Bhave ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Dip Coating ◽  
Treatment Temperature ◽  
Micro Structure ◽  
Spectroscopy Analysis ◽  
Bending Vibration ◽  
Ceramic Thin Film ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Polyphenylcarbosilane (PPCS) was synthesized from thermal rearrangement of the polymethylphenylsilane around 350 ~ 430°C. Characterization of synthesized PPCS was performed with FT-IR spectroscopy analysis. From FT-IR data, the band at 1035cm-1 is very strong and assigned to CH2 bending vibration in Si-CH2-Si group, indicating the formation of the PPCS. Ceramic thin film was fabricated onto stainless substrate by dip coating using a 20wt% PPCS in toluene. Heat treatment of the samples was performed at various temperatures (600°C and 800°C) under nitrogen atmospheres. The prepared PPCS samples and the coating layers on SUS316 after heat treatment were analyzed using FT-IR and XPS, respectively.

Characterization Of Heattreated Polyparaphenylene-Based Carbons

1995 ◽  
Vol 413 ◽  
Author(s):  
M. J. Matthewsa ◽  
M. Endo ◽  
T. Takahashi ◽  
Y. Nishimura ◽  
T. Takamuku ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Anode Materials ◽  
Carbon Matrix ◽  
Treatment Temperature ◽  
Heat Treated ◽  
Disordered Carbon ◽  
B Doping ◽  
Carbon Anodes ◽  
Very High

ABSTRACTRaman spectroscopy and TEM measurements were recently performed on a series of polyparaphenylene (PPP)-based carbon samples which were heat-treated to temperatures between 600°C and 3000°C. Particular attention is focused on the development of carbonaceous structures at low heat-treatment temperatures (THT) in the range 600°C ≤ THT ≥ 800°C. PPP-based carbons heat treated in this temperature range have been found to have a very high affinity for the electrochemical introduction of lithium, which is of particular interest in ‘rocking-chair’ rechargeable Li batteries. Specific (Faradaic) capacities of up to 1120 mAh/g have been obtained for PPPbased carbon anodes with a THT of 700°C, which is about three times the capacity of GIC-based anode materials. At a heat-treatment temperature of 700° C, the PPPbased carbon has a disordered-granular appearance, as observed from TEM, while a ribbon-like graphitic structure is seen for heat treatment near 3000°C. Furthermore, Raman spectra show that, near a THT of 700° C, these PPP-based materials undergo a carbonization transformation from a mostly polymer-type extended lattice to a disordered carbon matrix, which undergoes partial graphitization at higher THT. Upon the introduction of small amounts of substitutionally-doped Boron (1% - 3% atomic), various properties are substantially modified. In this work we briefly discuss the effect of B-doping on the PPP-based carbon structure.

Hydrothermal Synthesis and Structure Characterization of Nanocrystalline Barium Titanate Powders

2006 ◽  
Vol 11-12 ◽  
pp. 23-26 ◽  
Author(s):  
Ji Xia Lei ◽  
Xiao Lin Liu ◽  
Jian Feng Chen
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Barium Titanate ◽  
Treatment Temperature ◽  
Structure Characterization ◽  
Narrow Particle Size Distribution ◽  
Oh Defect ◽  
Oh Defects ◽  
Calcined Temperature

Nano-sized barium titanate powders were prepared by the high-gravity reactive precipitation (HGRP)-hydrothermal method. The properties and defects of hydrothermal barium titanate crystallites were investigated by TEM, XRD and FTIR. The mean particle size of the hydrothermal barium titanate was about 70 nm with narrow particle size distribution. The crystallite phases and OH defects were focused. The results show that the powders without heat treatment were crystallized as cubic-BaTiO3 and the absence of tetragonal with increasing calcined temperature to 1100°C. The IR results exhibited the OH defect content in the crystallites was to increase the heat treatment temperature and reduced the probability of forming barium vacancies.

scholarly journals Metallurgical Characterization of Welded Joint of Nanostructured Bainite: Regeneration Technique versus Post Welding Heat Treatment

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4841
Author(s):  
Aleksandra Królicka ◽  
Krzysztof Radwański ◽  
Aleksandra Janik ◽  
Paweł Kustroń ◽  
Andrzej Ambroziak
Keyword(s):  
Heat Treatment ◽  
Welded Joint ◽  
Construction Material ◽  
Weld Zone ◽  
Base Material ◽  
Welding Process ◽  
Solidification Structure ◽  
Hardness Distribution ◽  
Diffusion Type

One of the main limitations in application of nanostructured carbide-free bainite as a construction material is the difficulty of joining. This research presents a structural characterization of welded joints of medium carbon 55Si7 grade steel after the welding process with a regeneration technique as well as post welding heat treatment (PWHT). The hardness distribution of the welded joint with regeneration exhibit an overall decrease in hardness when compared to the base material and a significant decrease in hardness was observed in the heat-affected zone (HAZ). Unfavorable hardness distribution was caused by the presence of diffusion-type transformations products (pearlite) in the HAZ and bainite degradation processes. On the other hand, welding with the PWHT promotes the achievement of a comparable level of hardness and structure as in the base material. However, a slight decrease in hardness was observed in the weld zone due to the micro-segregation of the chemical composition caused by the indissoluble solidification structure. Based on the structural analysis, it was found that steel with relatively low hardenability (55Si7) should be welded using PWHT rather than a regeneration technique.

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