Impact of High Temperature Preservation of Wheat Sprout Extracts as Cosmetic Ingredient on Anti-oxidation Activity and Amount of Percutaneous Moisture Evaporation

Suspensions of platinum nanoparticles (PtNPs) were formed in molten LiCl–LiBr–KBr via thermal decomposition of H2PtCl6, and subsequently evaluated for thermal stability and CO oxidation activity.

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High Temperature Corrosion Behavior of Ni3A1-Based Alloys

MRS Proceedings ◽

10.1557/proc-364-975 ◽

1994 ◽

Vol 364 ◽

Author(s):

H. Li ◽

J. T. Guo ◽

W. H. Lai ◽

S. H. Wang ◽

M. H. Tan

Keyword(s):

Stainless Steel ◽

High Temperature ◽

Oxidation Resistance ◽

Corrosion Behavior ◽

Oxidation Rate ◽

High Temperature Corrosion ◽

Al Alloys ◽

Initial Oxidation ◽

Oxidation Activity ◽

Activity Energy

AbstractThe corrosion behavior of a Ni3A1–1 5at%Fe alloy has been studied in air and melted salts, and also that of Ni3Al alloys contained series boron in melted salts. The first alloy has two oxidation rate constants. Its initial oxidation activity energy is 319 kJ / mol. There was much FeAl2O4 formed at 950°C, which possessed better oxidation resistance than NiFe2O4, therefore the alloy had the best oxidation resistance at 950°C. It also had better sulfidation resistance than 00Cr19NillTi stainless steel at 850°C, but the alloy was sulfidized seriously at 950°C. The sulfides were FeS2 at 850°C and A12S3, Ni2S3 at 950°C. There were different initial oxides formed, which were Fe3O4 at 850°C, and mixture oxides of NiO, NiMoO4, A12O3 and NiAl2O4 at 950°C , respectively. The Ni3Al alloys with boron contents from 0 to 3.7at% had better sulfidation resistance than the stainless steel at 850°C, and the alloy with 1.37at%B was the best. The sulfides were the same in the boron containing Ni3Al alloys which were Al2S3 and Ni7S6.

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The influence of CePO4 nanorods on the CO oxidation activity of Au/GdPO4-rods

RSC Advances ◽

10.1039/c8ra02206b ◽

2018 ◽

Vol 8 (39) ◽

pp. 21699-21711

Author(s):

Yu Huanhuan ◽

Chen Fayun ◽

Zhubaolin Zhubaolin ◽

Huang Weiping ◽

Zhang Shoumin

Keyword(s):

Catalytic Activity ◽

High Temperature ◽

Co Oxidation ◽

Oxidation Activity ◽

Temperature Resistance ◽

Ultrasound Method ◽

High Temperature Resistance ◽

Good Catalytic Activity ◽

Content Of Gold ◽

Good Support

A CePO4–GdPO4 composite was prepared by a general ultrasound method and could be a good support for gold nanocatalysts. Au/CePO4–GdPO4 catalysts with a low content of gold showed good catalytic activity, high temperature resistance and stability for CO oxidation.

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Effect of SO2 Treatment at High Temperature on Soot Oxidation Activity of Cu–Ce–Al Mixed Oxides

Catalysis Letters ◽

10.1007/s10562-009-9916-z ◽

2009 ◽

Vol 131 (3-4) ◽

pp. 463-468 ◽

Cited By ~ 5

Author(s):

Xiaodong Wu ◽

Fan Lin ◽

Duan Weng ◽

Liwei Jia ◽

Meiqing Shen

Keyword(s):

High Temperature ◽

Mixed Oxides ◽

Soot Oxidation ◽

Oxidation Activity ◽

Soot Oxidation Activity

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Improvement of the carbon oxidation activity of Cu-MFI by high-temperature pretreatment

Catalysis Communications ◽

10.1016/j.catcom.2010.02.025 ◽

2010 ◽

Vol 11 (9) ◽

pp. 820-823 ◽

Cited By ~ 3

Author(s):

Yuya Abe ◽

Hiroyuki Yamaura ◽

Syuhei Yamaguchi ◽

Hidenori Yahiro

Keyword(s):

High Temperature ◽

Carbon Oxidation ◽

Oxidation Activity ◽

Temperature Pretreatment

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Preparation of ZrB2-MoSi2 high oxygen resistant coating using nonequilibrium state powders by self-propagating high-temperature synthesis

Journal of Advanced Ceramics ◽

10.1007/s40145-021-0485-y ◽

2021 ◽

Vol 10 (5) ◽

pp. 1011-1024

Author(s):

Menglin Zhang ◽

Xuanru Ren ◽

Mingcheng Zhang ◽

Songsong Wang ◽

Li Wang ◽

...

Keyword(s):

High Temperature ◽

Raw Materials ◽

Nonequilibrium State ◽

High Oxygen ◽

Glass Layer ◽

Composite Powders ◽

Temperature Synthesis ◽

Oxidation Activity ◽

High Temperature Synthesis ◽

Oxidation Stage

AbstractTo achieve high oxygen blocking structure of the ZrB2-MoSi2 coating applied on carbon structural material, ZrB2-MoSi2 coating was prepared by spark plasma sintering (SPS) method utilizing ZrB2-MoSi2 composite powders synthesized by self-propagating high-temperature synthesis (SHS) technique as raw materials. The oxygen blocking mechanism of the ZrB2-MoSi2 coatings at 1973 K was investigated. Compared with commercial powders, the coatings prepared by SHS powders exhibited superior density and inferior oxidation activity, which significantly heightened the structural oxygen blocking ability of the coatings in the active oxidation stage, thus characterizing higher oxidation protection efficiency. The rise of MoSi2 content facilitated the dispersion of transition metal oxide nanocrystals (5–20 nm) in the SiO2 glass layer and conduced to the increasing viscosity, thus strengthening the inerting impact of the compound glass layer in the inert oxidation stage. Nevertheless, the ZrB2-40 vol%MoSi2 coating sample prepared by SHS powders presented the lowest oxygen permeability of 0.3% and carbon loss rate of 0.29×10−6 g·cm−2·s−1. Owing to the gradient oxygen partial pressure inside the coatings, the Si-depleted layer was developed under the compound glass layer, which brought about acute oxygen erosion.

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Influence of Thermo-Mechanical Processing on the Microstructure of Beryllia Dispersed Nickel Alloys

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100071363 ◽

1973 ◽

Vol 31 ◽

pp. 184-185

Author(s):

M.S. Grewal ◽

S.A. Sastri ◽

N.J. Grant

Keyword(s):

High Temperature ◽

Nickel Alloys ◽

Thermomechanical Processing ◽

Cold Work ◽

High Temperature Strength ◽

Strengthening Effect ◽

Mechanical Processing ◽

Uniform Dispersion ◽

Oxide Particles ◽

Nickel Base

Currently there is a great interest in developing nickel base alloys with fine and uniform dispersion of stable oxide particles, for high temperature applications. It is well known that the high temperature strength and stability of an oxide dispersed alloy can be greatly improved by appropriate thermomechanical processing, but the mechanism of this strengthening effect is not well understood. This investigation was undertaken to study the dislocation substructures formed in beryllia dispersed nickel alloys as a function of cold work both with and without intermediate anneals. Two alloys, one Ni-lv/oBeo and other Ni-4.5Mo-30Co-2v/oBeo were investigated. The influence of the substructures produced by Thermo-Mechanical Processing (TMP) on the high temperature creep properties of these alloys was also evaluated.

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Application of TEM to Deformation, Wear, and Fracture of Ceramics

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100052377 ◽

1974 ◽

Vol 32 ◽

pp. 472-473

Author(s):

B. J. Hockey

Keyword(s):

Wear Resistance ◽

High Temperature ◽

Mechanical Behavior ◽

Brittle Materials ◽

High Temperature Strength ◽

Wide Range ◽

Corrosive Environments ◽

Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

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Lattice Imaging of Grain Boundaries in Ceramics

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100078171 ◽

1977 ◽

Vol 35 ◽

pp. 114-115

Author(s):

D. R. Clarke ◽

G. Thomas

Keyword(s):

Mechanical Properties ◽

High Temperature ◽

Silicon Nitride ◽

Grain Boundaries ◽

High Temperature Strength ◽

Current Interest ◽

Lattice Imaging ◽

Special Significance ◽

Structural Applications ◽

Refractory Ceramics

Grain boundaries have long held a special significance to ceramicists. In part, this has been because it has been impossible until now to actually observe the boundaries themselves. Just as important, however, is the fact that the grain boundaries and their environs have a determing influence on both the mechanisms by which powder compaction occurs during fabrication, and on the overall mechanical properties of the material. One area where the grain boundary plays a particularly important role is in the high temperature strength of hot-pressed ceramics. This is a subject of current interest as extensive efforts are being made to develop ceramics, such as silicon nitride alloys, for high temperature structural applications. In this presentation we describe how the techniques of lattice fringe imaging have made it possible to study the grain boundaries in a number of refractory ceramics, and illustrate some of the findings.

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Effect of Improved ThO2 Particle Dispersion in Nickel on High-Temperature Strength

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100069211 ◽

1970 ◽

Vol 28 ◽

pp. 444-445

Author(s):

E. R. Kimmel ◽

H. L. Anthony ◽

W. Scheithauer

Keyword(s):

High Temperature ◽

Metal Matrix ◽

Oxide Particle ◽

Oxide Phase ◽

Dislocation Motion ◽

Particle Dispersion ◽

High Temperature Strength ◽

Strengthening Effect ◽

Oxide Particles ◽

The Stability

The strengthening effect at high temperature produced by a dispersed oxide phase in a metal matrix is seemingly dependent on at least two major contributors: oxide particle size and spatial distribution, and stability of the worked microstructure. These two are strongly interrelated. The stability of the microstructure is produced by polygonization of the worked structure forming low angle cell boundaries which become anchored by the dispersed oxide particles. The effect of the particles on strength is therefore twofold, in that they stabilize the worked microstructure and also hinder dislocation motion during loading.

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