Microstructure and Thermodynamic Analysis of Graphene-Reinforced Coating Surface

2021 ◽  
Vol 1033 ◽  
pp. 56-60
Author(s):  
He Ping Liu ◽  
Heng Zhe Yang ◽  
Lang Lang Liu ◽  
Feng Er Sun ◽  
Xiao Min Yang ◽  
...  
Keyword(s):  
Particle Size ◽  
Thermodynamic Analysis ◽  
Induction Coil ◽  
Mean Particle Size ◽  
Substrate Distance ◽  
Cladding Layer ◽  
Coating Surface ◽  
The Mean ◽  
Graphene Content

The microstructure of coatings with different graphene content and the hardness of cladding layer under different distance between coil and samples were investigated. The results showed that with the increase of graphene, the mean particle size of the powder did not get significantly coarser. The defects and oxides were appeared in the cladding layer and graphene diffused into the substrate. Distance between induction coil and sample has great impact on the hardness of coating, the higher hardness was measured in the distance between 6-8cm. The thermodynamic analysis of coating nucleation was carried out.

Effect of Ag addition in Sn on growth of SnTe compound during reaction between molten solder and tellurium

2010 ◽  
Vol 25 (2) ◽  
pp. 391-395 ◽  
Author(s):  
Chien-Neng Liao ◽  
Yen-Chun Huang
Keyword(s):  
Particle Size ◽  
Reaction Time ◽  
Electrical Properties ◽  
Bismuth Telluride ◽  
Molten Solder ◽  
Thermoelectric Modules ◽  
Ag Addition ◽  
Mean Particle Size ◽  
Mechanical And Electrical Properties ◽  
The Mean

SnTe is the most common compound formed at the bismuth telluride/metal soldered junction of thermoelectric modules. It affects the mechanical and electrical properties of the soldered junction. In the study we investigate the growth of SnTe compound during reaction between molten Sn–3.5Ag solder and tellurium at 250 °C. We found that the growth of SnTe is suppressed by Ag–Te bilayer compounds that block further reaction between liquid Sn and Te. With increasing reaction time, the SnTe morphology becomes rough as a result of coarsening of SnTe grains. The growth of SnTe grains follows the conservative ripening kinetics with the mean particle size proportional to one-third power of reaction time.

Preparation of Nanocrystalline Fe2O3 Powder by Cryomilling with Liquid Nitrogen and its Magnetic Property

2020 ◽  
Vol 993 ◽  
pp. 806-810
Author(s):  
Zhi Wei Zhang ◽  
Bing Wei Luo ◽  
Hai Tao Zhou ◽  
Fen Wang
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Magnetic Property ◽  
Liquid Nitrogen ◽  
Room Temperature ◽  
Single Phase ◽  
Rapid Preparation ◽  
Mean Particle Size ◽  
Milling Temperature ◽  
The Mean

Rapid preparation of nanocrystalline γ-Fe2O3 powder with superparamagnetism was realized by cryomilling commercial Fe2O3 powder using liquid nitrogen. The effects of milling temperature and duration on the grain size, phase and microstructure of the nanocrystalline Fe2O3 powder were analyzed. Magnetic property of the nanocrystalline γ-Fe2O3 powder was also tested by magnetometer at room temperature. The results demonstrate that nanocrystalline γ-Fe2O3 powder with single phase can be prepared rapidly by cryomilling with liquid nitrogen. The mean particle size of γ-Fe2O3 powder can be reduced from 300 nm to 13 nm by cryomilling at −130 °C within 3 hours. The nanocrystalline γ-Fe2O3 powder shows superparamagnetism at room temperature.

Preparation and Research of Oil in Water Microemulsion

2020 ◽  
Vol 1001 ◽  
pp. 110-114
Author(s):  
Xiao Qi Chen ◽  
Meng Meng Zhou ◽  
Zheng Zheng Wang ◽  
Hai Jun Zhou ◽  
Shu Lan Yang ◽  
...  
Keyword(s):  
Particle Size ◽  
Constant Temperature ◽  
Polydispersity Index ◽  
Stable System ◽  
Mass Ratio ◽  
Drop Method ◽  
Mean Particle Size ◽  
Oil In Water ◽  
The Mean ◽  
The Stability

A series of oil in water (O/W) microemulsions were prepared through drop by drop method at constant temperature, taking Span80/Tween80 as a composite emulsifying system and Macol-52 as oil phase. Effects of the mass ratio of composite emulsifying system and oil/emulsifier ratio on the particle size were studied. Finally, the best technological conditions were selected and the stability of the microemulsion was also researched. Results showed that the most suitable Span80/Tween80 mass ratio was 1:1 and the oil/emulsifier ratio is 1:1. Under this condition, the mean particle size of the o/w microemulsion was 71.1 nm and the polydispersity index was 0.151. Moreover, the microemulsion maintain a bright and uniform stable system after 20minutes’ centrifugation at the speed of 4000r/min and the particle size increased slightly.

The Depositional Laser Cladding with Fiber Laser

2009 ◽  
Vol 628-629 ◽  
pp. 447-452
Author(s):  
Peng Fei Lv ◽  
Ji Min Chen ◽  
F.R. Liu
Keyword(s):  
Particle Size ◽  
Laser Cladding ◽  
Surface Engineering ◽  
Laser Energy ◽  
Thin Layers ◽  
Material Surface ◽  
New Approach ◽  
Mean Particle Size ◽  
Cladding Layer

Laser cladding has been developed as a useful technology to modify material surface in industry. In this paper a new approach of surface modification is introduced. Depositional Laser Cladding (DLC) was developed and the different mechanisms were investigated during the manufacture. Basing on particular analysis of defects in the experiment, the relation between the quality of cladding layer and laser energy density is manifested. Depositional effect and thermal effect play their roles in different place and the depositional effect provides thin layers with the thickness of near mean particle size. Appropriate parameters of laser energy can promote high quality, avoiding pores and stacks in agglomeration and ebullition. Controllable low thickness near mean particle size and sharp edge make it possible to be used on producing certain shape in the surface engineering field, such as restoring and gradient materials.

The State of Polydispersion of Hevea Latex. II.

1947 ◽  
Vol 20 (2) ◽  
pp. 409-415
Author(s):  
J. H. E. Hessels
Keyword(s):  
Particle Size ◽  
Surface Area ◽  
Degree Of Polymerization ◽  
The State ◽  
Rubber Industry ◽  
Mean Particle Size ◽  
Degree Of Dispersion ◽  
The Mean ◽  
In The Beginning

Abstract The influence of the degree of dispersion in latex on the composition and properties of the rubber was studied in detail by means of a series of latices, the mean particle size of which ranged from 1.1 to 0.15µ in diameter. These fractions were first obtained by centrifugation of preserved latex, and the degree of distribution was measured by photomicrographic analysis and by sedimentation. This method of fractionation yields latices and rubbers with compositions which differ widely. With decrease in the size of the particles, their surface area per unit of rubber increases, and the percentage of nonrubber components which is adsorbed irreversibly or which is dissolved in the serum increases greatly. On the contrary, the degree of polymerization decreases with decrease in the diameter of the particles. This may be explained by the fact that, in the beginning, the polymerization of the globules is relatively low, and that it progresses under the influence of a catalyst present in the serum. In brief, then, systematic dispersoidal analysis of Hevea latex is of prime importance in the plantation rubber industry.

Changes in the electronic structure of gold particles upon thiol adsorption as a function of the mean particle size

2006 ◽  
Vol 495 (1-2) ◽  
pp. 180-185 ◽  
Author(s):  
Michael Büttner ◽  
Helge Kröger ◽  
Inga Gerhards ◽  
Daniel Mathys ◽  
Peter Oelhafen
Keyword(s):  
Particle Size ◽  
Electronic Structure ◽  
Gold Particles ◽  
Mean Particle Size ◽  
The Mean

Low-Temperature Synthesis of Cordierite Using Magnesite

2014 ◽  
Vol 608 ◽  
pp. 122-126
Author(s):  
Jae Hwan Pee ◽  
Geun Hee Kim ◽  
Na Ri Lee ◽  
Hyung Tea Kim ◽  
Lada Punsukumtana
Keyword(s):  
Particle Size ◽  
Magnesium Content ◽  
Low Density ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Mean Particle Size ◽  
Synthetic Rate ◽  
Low Thermal Expansion ◽  
Wide Range ◽  
The Mean

Cordierite (2MgO·2Al2O3·5SiO2) has a low density of 2.2 g/cm3 due to its high magnesium content. Because of its low thermal expansion coefficient of 1~2 x10-6 /°C, many studies are being conducted on the synthesis of cordierite with the expensive petalite as a replacement for lithium alumina silicate-based heat-resistant materials. The cordierite can be synthesized over a wide range: SiO2 at 50~70%, Al2O3 at 20~40%, and MgO at 10~30%. In this study, the range of chemical composition and temperature of cordierite synthesis is thoroughly investigated. In particular, we use natural materials (magnesite, kaolin and clay) to examine how thermal properties are affected by changes in crystal phase arising from the varying composition of MgO, SiO2 and Al2O3. We focused on factors leading to an increase in the rate of cordierite synthesis at temperatures below 1280 °C. From observing the synthetic rate over 1250~1280 °C, the sintered body at 1280 °C had a high synthetic rate greater than 80%. Magnesite was ball milled at constant intervals, and mean particle size was controlled to improve the synthetic rate of cordierite. As a result, the cordierite synthetic rate increased by more than 15% with decreasing the mean particle size of magnesite.

Preparation of Metal Nanosuspensions by High-Pressure DC-Sputtering on Running Liquids

1996 ◽  
Vol 457 ◽  
Author(s):  
M. Wagener ◽  
B. S. Murty ◽  
B. Günther
Keyword(s):  
Particle Size ◽  
High Pressure ◽  
Particle Size Distribution ◽  
Pressure Range ◽  
Narrow Particle Size Distribution ◽  
Descriptive Model ◽  
Mean Particle Size ◽  
Dc Sputtering ◽  
The Mean ◽  
Argon Sputtering

ABSTRACTA modified VERL-process (Vacuum evaporation on running liquids) employing high pressure magnetron sputtering has been used for the preparation of suspensions with metal nanoparticles. The method has been tested for Ag- and Fe-suspensions by varying the pressure of the Argon sputtering atmosphere in the range of 1 to 30 Pa. A narrow particle size distribution with a mean particle size ranging from 5–18 nm has been found. The mean particle size increases with increasing Argon pressure in the pressure range under investigation. A descriptive model for the process of particle formation as a function of sputtering gas pressure is given.

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