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Online since: February 2022
Authors: Svetlana V. Skvortsova, Arslang A. Lidzhiev, Natalia V. Ruchina, Alexey E. Ivanov
A porous coating obtained by plasma spraying is characterized by a minimum number of open pores - 5 pores / mm.
The main number of pores has a size from 100 to 200 µm with an average depth of 80 µm (Fig. 4a).
The porous coating obtained using the POROCOAT® technology is characterized by a significantly larger number of open pores - 11 pores / mm.
Pore width distribution in coatings obtained by plasma spraying (a), using the POROCOAT® technology (b), and DLMN (c) An important indicator for porous coatings, in addition to the size and number of open pores, is the adhesive strength.
At the same time, the POROCOAT® and GRIBTION® coating is characterized by the presence of common grains at the interface, which indicates the formation of physicochemical contact at the base-coating interface.
Online since: August 2004
Authors: Hirokazu Chazono, Hiroshi Kishi, Chie Ando
., 5607-2 Nakamuroda Haruna-machi Gunma-gun, Gunma 370-3347, Japan Keywords: barium titanate, solid state reaction, fine particles ABSTRACT The synthesis of fine-grained and high crystalline BaTiO3 (BT) particles was studied by solid state process.
Then, a large number of the contact points between BaCO3 and TiO2 will accelerate the reaction.
In the case of sample T2B3, the number of particle counts of BaCO3 was larger than that of TiO2.
On the other hand, in the case of sample T4B1, the number of particle counts of BaCO3 was smaller than that of TiO2.
This suggested that the inhomogeneous mixing for sample T4B1 caused the long path for diffusion of Ba 2+ ion species into TiO2, which was aggregate comprising a number of particles.
Online since: November 2011
Authors: Ke Wu Peng, Peng Zhang, Jian Guo Xie, He Li Ma
Vanadium produces its effects by increasing strength and improving toughness,primarily through a combination of grain refinement and precipitation strengthening.Because vanadium is the most soluble one of the rnicroalloying elements,the vanadium containing steels tends to be relatively easy to cast continuously.
Table 2 Liquidus temperature of Al2O3-CaO-SiO2-CaF2 slag Number Al2O3(%) CaO(%) SiO2 (%) CaF2(%) Liquidus temperature (˚C) 1 65 30 5 10 1532 2 65 30 5 15 1495 3 65 30 5 20 1469 Fig.1 Liquidus temperature of Al2O3-CaO-SiO2-CaF2 with 20% CaF2 The liquidus temperature of Al2O3-CaO-SiO2-CaF2 Slag was studied as shown in Table 2.
On the one hand, the temperature is the macroscopical representation of thermal motion of the microcosmic ion. when the temperature of the Al2O3-CaO-SiO2-CaF2 slag rises, the internal thermal motion of their ions become even faster, the number of Chaotic ion becomes more and more, the number of free ion increases, and directional migration number of ion increases too.
It is knock-on certainty the electrical conductivity must increase with increasing the directional migration number of ion.
Online since: August 2013
Authors: Zhi Guo Zhao, Wen Ming Yu
The basic calculation parameters of the model: the drum diameter is 140 mm, the height is 286 mm, the entrance diameter is 40 mm, the number of disc is 50, the thickness is 2 mm and the disc clearance is 2mm. 1-oil and gas entrance, 2- rotating shaft, 3-the oil outlet, 4-the air outlet Fig.1 The geometric model of the centrifugal gas-oil separator Meshing The internal geometry structure of the centrifugal oil and gas separator is complex, so the model uses the structured quadrilateral grid and the unstructured trilateral grid, getting a total of 22504units and 24953nodes.
In order to distinguish the particles number of oil outlet and the gas outlet, set the oil outlet adopted the trap conditions that is when the particles meet the wall, the running trajectory is over; the gas outlet adopts the escape conditions that is the particles escape when they contact to the boundary; the gas inlet adopts escape conditions, that is the particles escape when there is backflow; the rest wall conditions are reflect, namely the particles will be reflected when they achieve at the boundary.
The diameter scope of the oil droplets inside the oil-gas separator grain is 0-10um commonly.
Under the designed working conditions, the number of trap was 1932, the number of escape was 23, the number of particles stay in the drum was 45 and it can be concluded that separation efficiency was 96%, meeting the design requirements.
Online since: December 2011
Authors: Yun Tao Li, Xu Ma, Guang Da Liu, Wen Jun Zhang, Li Jun Yang
Figure 5 shows the microstructure of the HAZ is different grain sizes and ferrite and pearlite Analysis of stretch forming performance Stretch performance test Tensile tests were carried out on specimens of Tailor welded Galvanized Sheets machined.
The specimens were tested along two directions, with tensile axis being parallel (0◦), perpendicular (90◦) to the weld-line direction of the sheet (size and number are shown in Fig.6).
(a) Base metal (A1, A2, A3) (b) Transverse specimen numbered (B1, B2, B3) (weld line in the center) (c) Transverse specimen numbered (C1, C2, C3) (d) longitudinally welded specimens (D1, D2, D3) (weld line from center for 5mm) Fig.6 TWB tensile specimens used in tensile tests (a)(b)(c)(d) Table 3 Results of the tensile specimens for TWB NO.
(a) (b) Fig.7 The fracture surface of base metal of A1, A2, A3, A4(a) (b) (a) (b) Fig.8 The fracture surface of the weld line was perpendicular to tensile axial of B1, B2, B3, B4 (weld line located in the center of the specimen)(a) (b) (a) (b) Fig.9 The fracture surface of the weld line perpendicular to tensile axial of C1, C2, C3, C4 (weld line offset center line 5mm)(a) (b) (a) (b) Fig.10 The fracture surface of specimens with the weld line parallels tensile axial of D1, D2, D3, D4(a)(b) As it is shown in Fig.7 (a) and (b), the scanned fracture surface of the base metal consists of a great number of well-distributed dimples.
Seen from Fig9 (a) and (b), fracture morphology is a number of well-distributed dimples.
Online since: December 2014
Authors: Mauro Cesar Terence, Ederson Esteves Silva, Juan Alfredo Guevara Carrió
With properties that could not be achieved with microscale materials this nanostructure has a huge number of qualities that are amazing, Great expectations are generated about the possibilities of application in several areas of technology, such as electronic devices, opto-electronic, transparent electrodes, energy storage, catalyst, drug release system and sensors [1,2,4].
The number of steps involved in the production of graphene oxide can add undesirable defects to the two-dimensional lattice, and yet many studies were conducted on the transfer methods for application in different areas.
In order to obtain the greatest number of flakes with numbers of layers near the DDP is undone in 10 minutes.
However, another factor that directly determines the size of the exfoliated flakes are the size of the grains in the structure of graphite.
Acknowledgement FAPESP foundation under contract number 2014/08872-0.
Online since: January 2014
Authors: Liang Ge Xu, Xiao Xian Li, Jie Ye, Xia Ji, Hong Qiu, Jing Luo, Hui Guang Yang
J.Buha [5] studied the microstructure of Mg-Zn-Cu-Mn alloy in different aging temperature, pointing out that the T6 condition, the presence of a large number of rod-like and massive phase alloy microstructure.
Li Aiwen etc.[6] studied Cu microstructure of the Mg-3Zn-0.6Zr (wt.%) alloy 180 ℃ × 16 h peak aging, and Pointed out that the Cu content (wt Cu <2.0%) is more, the more the number of- MgZn2 distribution becomes more diffuse, the smaller the average grain size.
It shows that the structure solution treated has the strong precipitation momentum, and has a large number of precipitates in the process of aging.
Fig.2 DSC curve of Mg-6Zn-1.5Cu alloy solution treated at 430℃ for 24h From the figure 3a, it is known that the TEM images show the rod phases which they uniformly distribute a large number of along the direction of growth.
(b) (a) Fig3 The microstructure of experimental alloy aged at 150℃×56h (the electron beam was approximately parallel to) The experimental results show that adding the Cu element and via the appropriate aging process can precipitate a large number of MgZn2 and improve the aging hardening effect in Mg-Zn binary alloy.
Online since: May 2016
Authors: Pradeepan Periyat, Binu Naufal, P.K. Jaseela
The FT IR spectra of the gel dried at 100 ºC was measured by using a Jasco-FT/IR-4100 spectrometer in the wave number range 4000-400 cm-1 using 70 scans for each sample.
This decrease in crystallite size may be due to the distribution of dopant cations at the crystal lattice or it may be on the grain boundary of TiO2 which inhibits grain growth by providing a barrier between the TiO2grains[18].
In addition to this the decrease in crystalline size may attributed to the presence of Ti-O-Sm bond formation in the Sm3+ doped sample, which inhibits the growth of crystal grains[19].
This higher surface area of Sm3+ doped TiO2 can help to absorb more number of dye molecules compared to bare TiO2 during the photocatalytic reaction and hence contribute towards higher photocatalytic effiency. 3.4 Scanning Electron Microscopy (SEM) The morphology of the TiO2 and Sm3+ doped TiO2 sample was analyzed using Scanning Electron Microscopy (SEM).
The average grain diameter was measured as being in the range of a few nanometers.
Online since: October 2022
Authors: Xue Feng Guo, Hong Bao Cui, Jing Jing Zhou, Ying Wang, Wen Peng Yang, Zhi Chao Xu
In Mg-6Zn-1Ce alloy (Fig. 4a) alloy the average grain size of α-Mg is about 30 μm and area fraction of intermetallics is about 3.8%.
In Mg-6Zn-2Ce alloy the average grain size of α-Mg is about 27 μm and area fraction of compounds is about 5.0%, as shown in Fig. 5a.
Discussions Due to the low addition of Ce, there are still a small number of Mg4Zn7 and Mg7Zn3 phases in Mg-6Zn-0.6Ce alloy.
When the additive amount of Ce in Mg-6Zn alloy increase to 1%, the main compound in Mg-6Zn alloy is the Mg-Zn-Ce phase and a small number of β1′ precipitation particles in matrix.
Buha, Grain refinement and improved age hardening of Mg-Zn alloy by a trace amount of V, Acta Mater. 56 (2008) 3533-3542
Online since: June 2023
Authors: Nikolay Petkov, Hristo Bahchedzhiev, Ladislav Lemberk, Totka Bakalova, Michal Krafka
The performance of CrN/TiN multilayer coatings was found to be associated with the modulated period (Λ), grain size, and interface structure [17, 19-21, 25-27].
The thicknesses of NML structures were measured by a Calotest using a steel ball with a diameter of 30 mm and a diamond paste with 0.1µm monocrystalline diamond grains.
This is probably due to follow effects: decrease of the modulation period leads to decrease of crystallite size, and leads to the increase of the hardness according to the Hall-Petch law (H ~ d-1/2, d is the grain size).
SGS-2022-5060 and by the project “Pretreatment, coating and protection of the substrate”, registration number CZ.01.1.02/0.0/0.0/20_321/0025264 were obtained through the financial support of the Ministry of Industry and Trade in the framework of the targeted support of the “Application VIII”, the Operational Programme Enterprise and Innovations for Competitiveness.
Aoki, Coefficients of friction of TiN coatings with preferred grain orientations under dry condition, Wear 265 (2008) 1017–1022
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