Synthesis of yttria-stabilized zirconia nanoparticles by decomposition of metal nitrates coated on carbon powder

1996 ◽  
Vol 11 (9) ◽  
pp. 2318-2324 ◽  
Author(s):  
Shusheng Jiang ◽  
Gregory C. Stangle ◽  
Vasantha R. W. Amarakoon ◽  
Walter A. Schulze
Keyword(s):  
Carbon Black ◽  
Crystallite Size ◽  
Surface Area ◽  
Yttria Stabilized Zirconia ◽  
Synthesis Process ◽  
Carbon Powder ◽  
Stabilized Zirconia ◽  
Black Powder ◽  
Carbon Black Powder ◽  
Metal Nitrates

Weakly agglomerated nanoparticles of yttria-stabilized zirconia (YSZ) were synthesized by a novel process which involved the decomposition of metal nitrates that had been coated on ultrafine carbon black powder, after which the carbon black was gasified. The use of ultrafine, high-surface-area carbon black powder apparently allowed the nanocrystalline oxide particles to form and remain separate from each other, after which the carbon black was gasified at a somewhat higher temperature. As a result, the degree of agglomeration was shown to be relatively low. The average crystallite size and the specific surface area of the as-synthesized YSZ nanoparticles were 5−6 nm and 130 m2/g, respectively, for powder synthesized at 650 °C. The as-synthesized YSZ nanoparticles had a light brown color and were translucent, which differs distinctly from conventional YSZ particles which are typically white and opaque. The mechanism of the synthesis process was investigated, and indicated that the gasification temperature had a direct effect on the crystallite size of the as-synthesized YSZ nanoparticles. High-density and ultrafine-grained YSZ ceramic articles were prepared by fast-firing, using a dwell temperature of 1250 °C and a dwell time of two minutes or less.

The Study on Pyrolytic Carbon Powder in the Coating Process of Fuel Particle for High-Temperature Gas-Cooled Reactor

2010 ◽  
Author(s):  
Malin Liu ◽  
Bing Liu ◽  
Youlin Shao
Keyword(s):  
High Temperature ◽  
Carbon Black ◽  
Pyrolytic Carbon ◽  
Nano Particles ◽  
Carbon Powder ◽  
Fuel Particle ◽  
Coating Process ◽  
Black Powder ◽  
Carbon Black Powder ◽  
High Temperature Gas

The R&D of coating process of fuel particles is one of the most important key technologies in the research work of high-temperature gas-cooled reactor (HTGR). A safe and reliable coating process is expected and related to the prospect of large-scale utilization of nuclear energy. The related research of the carbon black powder which is the main byproduct generated in the coating process is important, because it relates to the impact of coating process on the surrounding environment and is also helpful to understand the deposit mechanism of PyC (pyrolytic carbon) layer coated on the fuel particle. In the present study, the microstructure of the pyrolytic carbon powder were systematically investigated by scanning electron microscope (SEM), transmission electron microscopy (TEM), laser Raman spectroscopy and particle size analysis (PSA). It can be found that the carbon powder in the cyclone separator is composed of the nano-spherical particles with the diameter of about 50nm. The ring-layered nano-structured carbon particles could be found from the electron micrographs. The comparison between Raman spectra of carbon powder and pyrolytic carbon coated on the fuel particle showed that the droplet deposit mechanism was suitable to explain the PyC deposition process. The nano-particles agglomerate into the irregular floc and the diameters of the stable particle clusters are mainly 1 μm and 10 μm. The disposal methods of carbon black powder are also discussed.

scholarly journals An Experimental Analysis of Aggressive Environment of Concrete with Ceramic Tiles and Carbon Black Powder

2019 ◽  
Vol 8 (9) ◽  
pp. 3336-3339
Keyword(s):  
Carbon Black ◽  
Ceramic Powder ◽  
High Strength ◽  
Cement Industry ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Carbon Powder ◽  
Sulphate Content ◽  
Black Powder ◽  
Carbon Black Powder

In the manufacturing industry among the primary producers of carbon dioxide, cement industry plays one o f the important role. Hence if we reduce the amount of usage of cement in concrete preparation, it will be helpful for a healthy environment. Upon consider the environmental pollution, in the concrete preparation mineral admixtures are used as a partial substitute for cement. Here in this paper, ultra-fine ceramic powder is using as a mineral admixture which are procured from used or broken tiles in 5%, 10% and 15% as level of replacement and also carbon black powder from rubber industry in 1% both by weight of water to made a high strength concrete of M50 grade Concrete. In severe environments like industrial and marine environments, a concrete with high strength may not perform because they are characterized by high chloride content, sulphate content or combination of both. Hence in order to provide such an environment in the laboratory, the specimens are subjected for curing in H2SO4 acid (industrial) and NaCl base (marine). To find the performance of the use of ceramic powder, black carbon powder, compressibility strength and split tensile strength, flexural strength, porosity, corrosion resistance tests are performed.

Electrolytic synthesis of ZrSi/ZrC nanocomposites from ZrSiO4 and carbon black powder in molten salt

2020 ◽  
Vol 111 (7) ◽  
pp. 581-586
Author(s):  
Li Ming ◽  
Wu Xiufeng
Keyword(s):  
Electron Microscopy ◽  
High Temperature ◽  
Carbon Black ◽  
Molten Salt ◽  
Cell Voltage ◽  
Black Powder ◽  
X Ray ◽  
Carbon Black Powder ◽  
Transmission Electron ◽  
A Cell

Abstract ZrSi/ZrC nanocomposites have stable high-temperature properties, where conventional materials cannot meet increasingly demanding high-temperature environments. In this paper, the microstructure and electrochemical reduction mechanism of ZrSi/ZrC nanocomposites have been studied. A mixture of ZrSiO4 and carbon black powder was processed using ball grinding, sheet pressing, and sintering, and cylindrically-sintered sheet was prepared as the cathode for the electrolytic work. A high purity graphite rod was utilized as the anode.The microstructure of the electrolytic product was characterized and analyzed using X-ray diffraction, scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy, and transmission electron microscopy. The experimental results showed that the diameter of the as-synthesized ZrSi/ ZrC fibers typically range between 100-400 nm when produced by the electrolysis of sintered pellets in equimolar CaCl2-NaCl molten salt at 850°C with a cell voltage of 2.8 V for 20 h under an argon atmosphere. The nanofibers were formed in core-shell microstructures that overlap and grow.

scholarly journals Measurement of Photon Buildup Factor for Samples of Iraqi Carbon Black Material

2016 ◽  
Vol 8 (2) ◽  
pp. 444-450
Author(s):  
Baghdad Science Journal
Keyword(s):  
Carbon Black ◽  
Experimental Results ◽  
Buildup Factor ◽  
Mixing Ratio ◽  
Black Powder ◽  
Mixing Ratios ◽  
Carbon Black Powder ◽  
Expected Values

The buildup factor was measured after irradiating Iraq carbon black powder using each of and sources respectively, using mixing ratios 40% & 50% for thickness range . The results showed that the buildup factor depends on energy and has limited dependence on the mixing ratio. The QIFT program succeeded accenting for the experimental results even for expected values more than 4 m.f.p outside the thickness range.

Elaboration of Sol-Gel Derived Hydroxyapatite / Yttria Stabilized Zirconia Composite Coatings Obtained for Biomedical Application

2011 ◽  
Vol 312-315 ◽  
pp. 894-899
Author(s):  
Sahar Salehi ◽  
Mohammad Hosseien Fathi
Keyword(s):  
Grain Size ◽  
Crystallite Size ◽  
Grain Growth ◽  
Biomedical Application ◽  
Composite Coatings ◽  
Sol Gel ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Nanostructured Composite

In this study, nanostructured composite coatings of hydroxyapatite (HA)/ 30wt% yttria stabilized zirconia (YSZ) coatings containing 0, 3, 5, and 8 mol% Y2O3 (namely; HA-0YSZ, HA-3YSZ, HA-5YSZ, and HA-8YSZ) were successfully synthesized using the sol-gel method. The crystallite size of the coating was about ~44-58 nm for tetragonal and cubic zirconia grain size and 75-87 nm for hydroxyapatite grain size. Crack-free and homogeneous HA-YSZ composite coatings were obtained with no observable defects. The uniform distribution of zirconia particles in a composite would be highly beneficial for obtaining homogeneous coatings of HA-YSZ film and would hinder grain growth of HA phase during calcinations. In vitro evaluation in 0.9% NaCl showed that Ca2+ dissolution rate of composite coatings was lower than pure HA coatings.

Changes in the Microstructure of Plasma-Sprayed Yttria-Stabilized Zirconia Deposits during Simulated Operating Conditions

1997 ◽  
Author(s):  
J. Ilavsky ◽  
G.G. Long ◽  
A.J. Allen ◽  
C.C. Berndt ◽  
H. Herman
Keyword(s):  
Surface Area ◽  
Small Angle Neutron Scattering ◽  
Operating Conditions ◽  
Yttria Stabilized Zirconia ◽  
Pore Surface ◽  
Stabilized Zirconia ◽  
Heating Rates ◽  
Surface Areas ◽  
Time Changes ◽  
Plasma Sprayed

Abstract The microstructures of as-sprayed and thermally-cycled freestanding and on-substrate deposits of yttria-stabilized zirconia were studied using small-angle neutron scattering (SANS). The SANS analysis allows the interlamellar pores and the intralamellar cracks, which are the two dominant void systems in the microstructure, to be characterized separately. Whereas up to 20% of the void surface area in the as-sprayed deposits was found to be in the cracks, the thermally-cycled deposits contained only a negligible quantity of cracks. At the same time, changes in the pore surface areas between the lamellae (i.e., the interlamellar pores) were much smaller. As a result, the microstructure of the thermally-cycled deposits was much more anisotropic than the microstructure of the as-sprayed deposits. Varying the cooling and the heating rates did not significantly change the microstructure but varying the total time that the deposits were at high temperature did affect the evolution of the surface area. The presence or absence of a bond coat and substrate also did not measurably influence the results.

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