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Online since: May 2012
Authors: Han Wu Liu, Wen Jing Sun, Shuai Gao
The high-performance middle-high temperature flat solar selective absorption coating with excellent optical properties (absorption ratio was greater than 0.92 and the launch ratio was less than 0.09), strong oxidation resistance and weather resistance was prepared by the use of magnetron sputtering technique.
By controlling the process parameters and the experimental tests of the optical properties, a good performance SiO2 minus reflection film was obtained, and then combined it with SS-N-O to form a relatively inexpensive gradient coating which could meet the relevant performance requirements.
The function of the minus reflection film and the analysis of the influencing factors The middle-high temperature solar spectrum selective absorption coating has five types: intrinsic absorption film, optical interference film, multilayer gradient film, cermets film and optical trap film.
By the reasonable design of the structure of the minus reflection film, the transmission light can make close to 100%. [3] The main parameters which affect the minus reflection effects usually include the optical constants (refractive index) of the minus reflection film itself, the thickness and the refractive index of the corresponding substrate.
Conclusions The following conclusions can be obtained by the analysis of the test parameters and the obtained reflectance curve spectrum: 1) The adhesion and the optical properties of the SiO2 minus reflection film in the SS-N-O absorption coating are well.
By controlling the process parameters and the experimental tests of the optical properties, a good performance SiO2 minus reflection film was obtained, and then combined it with SS-N-O to form a relatively inexpensive gradient coating which could meet the relevant performance requirements.
The function of the minus reflection film and the analysis of the influencing factors The middle-high temperature solar spectrum selective absorption coating has five types: intrinsic absorption film, optical interference film, multilayer gradient film, cermets film and optical trap film.
By the reasonable design of the structure of the minus reflection film, the transmission light can make close to 100%. [3] The main parameters which affect the minus reflection effects usually include the optical constants (refractive index) of the minus reflection film itself, the thickness and the refractive index of the corresponding substrate.
Conclusions The following conclusions can be obtained by the analysis of the test parameters and the obtained reflectance curve spectrum: 1) The adhesion and the optical properties of the SiO2 minus reflection film in the SS-N-O absorption coating are well.
Online since: July 2021
Authors: Maxim М. Sychov, Sergey P. Bogdanov, Nikolay A. Khristiuk, A.V. Anisimov
The tribotechnical properties of the obtained coatings on rollers - friction pairs are determined.
- Unloading the reactor, cleaning the surface of the plate from the mixture, analyzing the properties of the coating.
Oxide phases were also not identified, which indicates that the acidification of the surface is insignificant and does not affect its physical and mechanical properties.
Duh, Evaluation of microstructures and mechanical properties of chromized steels with different carbon content, Surface and Coatings Technology 177-178 (2004) 525-531
Lin, Tribological properties evaluation of AISI 1095 steel chromized at different temperatures, Surface and coatings technology 188-189 (2004) 550-555
- Unloading the reactor, cleaning the surface of the plate from the mixture, analyzing the properties of the coating.
Oxide phases were also not identified, which indicates that the acidification of the surface is insignificant and does not affect its physical and mechanical properties.
Duh, Evaluation of microstructures and mechanical properties of chromized steels with different carbon content, Surface and Coatings Technology 177-178 (2004) 525-531
Lin, Tribological properties evaluation of AISI 1095 steel chromized at different temperatures, Surface and coatings technology 188-189 (2004) 550-555
Online since: December 2012
Authors: Worapot Ngamchompoo, Kittichai Triratanasirichai
For preheated gasifying agent, gasifying agent property have been specified by air-steam inlet stream in RGIBBS.
Although, water gas shift reaction is affected to decrease amount of CO; which effect to the HHV of product gas.
The CGE depends on various factors, especially, HHV of producer gas and biomass fuel.
At high ER, however, gasifying agent preheating has no affected to the contents of H2 and CO.
∎{TTP}8718 S/B increase has affected to the concentration of H2 and CO decrease.
Although, water gas shift reaction is affected to decrease amount of CO; which effect to the HHV of product gas.
The CGE depends on various factors, especially, HHV of producer gas and biomass fuel.
At high ER, however, gasifying agent preheating has no affected to the contents of H2 and CO.
∎{TTP}8718 S/B increase has affected to the concentration of H2 and CO decrease.
Online since: November 2013
Authors: Yan Ling Zhao, Su Chang Ma
Transfer market segment grid into design factors based on the Quality Function Deployment (QFD) and analyzing the uncertainty of the MC future development related to the demands.
This has become an extremely highlighted weak part throughout the machine industry, and seriously affects the improvement of China's machinery industry.
MC demand - variable matrix Map the entire customer demands and market segmentation grid to appropriate design factors based on the QFD, and identifying corresponding range for each scaling variable and product constraint and objective among the product family.
The customer demands are as follows: high practicality, product meets the requirements, good mechanical property, low cost, high safety and reliability and so on.
Journal of Mechanical Engeering.2012(11)
This has become an extremely highlighted weak part throughout the machine industry, and seriously affects the improvement of China's machinery industry.
MC demand - variable matrix Map the entire customer demands and market segmentation grid to appropriate design factors based on the QFD, and identifying corresponding range for each scaling variable and product constraint and objective among the product family.
The customer demands are as follows: high practicality, product meets the requirements, good mechanical property, low cost, high safety and reliability and so on.
Journal of Mechanical Engeering.2012(11)
Online since: September 2014
Authors: Aleksandr Dziuba, Vasyl Martsynkovskyy, Viacheslav Tarelnyk
As a result, formation of surface layers with special properties for sliding friction assemblies, for example, journal bearings (JB), is the critical task at present.
The applied materials of anode and cathode, and their some physical and mechanical properties are mentioned in the Tables 1, 2.
Physical and mechanical properties of the materials, applied during electroerosion alloying as cathode (sample) Material grade (DIN) Crystal lattice Tensile strength under tension [Kg/mm] Yield point, [kg/mm2] Hardness, [HB] C 45 CBL (cement bond log) 96.8 84.6 280 41 Cr 4 CBL (cement bond log) 98 86 220 The majority of factors have impact on the quality characteristics during electroerosion alloying, of the list of which the alloying modes should be marked out.
Physical and mechanical properties of materials applied during electroerosion alloying as anode (alloying electrode) Material grade Melting temperature, [ºC] Hardness Thermal conductivity, [W/m K] Coefficient of thermal expansion 10-6 , [grad -1] copper 1084 88HB 401 16.5 silver 817 25HB 453 14.2 tin 232 5HB 59.8 22 indium 157 0.9HB 87 60.5 Fig. 1.
[5] D.N.Reshetov, Machine parts: Textbook for students of engineering and mechanical specialities, Machinebuilding, Moscow, 1989
The applied materials of anode and cathode, and their some physical and mechanical properties are mentioned in the Tables 1, 2.
Physical and mechanical properties of the materials, applied during electroerosion alloying as cathode (sample) Material grade (DIN) Crystal lattice Tensile strength under tension [Kg/mm] Yield point, [kg/mm2] Hardness, [HB] C 45 CBL (cement bond log) 96.8 84.6 280 41 Cr 4 CBL (cement bond log) 98 86 220 The majority of factors have impact on the quality characteristics during electroerosion alloying, of the list of which the alloying modes should be marked out.
Physical and mechanical properties of materials applied during electroerosion alloying as anode (alloying electrode) Material grade Melting temperature, [ºC] Hardness Thermal conductivity, [W/m K] Coefficient of thermal expansion 10-6 , [grad -1] copper 1084 88HB 401 16.5 silver 817 25HB 453 14.2 tin 232 5HB 59.8 22 indium 157 0.9HB 87 60.5 Fig. 1.
[5] D.N.Reshetov, Machine parts: Textbook for students of engineering and mechanical specialities, Machinebuilding, Moscow, 1989
Online since: July 2006
Authors: Z. Horita
Aging Behavior of Aluminum Alloys after Severe Plastic Deformation
Zenji Horita
Department of Materials Science and Engineering, Faculty of Engineering,
Kyushu University, Fukuoka 819-0395, Japan
horita@zaiko.kyushu-u.ac.jp
Keywords: grain refinement, precipitation hardening, severe plastic deformation,
equal-channel angular pressing, Al-Mg-Si alloys, Al-Si-Ge alloy, Al-Ag alloy, transmission
electron microscopy, tensile properties
Abstract.
The microstructures are observed using transmission electron microscopy and the mechanical properties including hardness are measured.
ECAP is conducted on these alloys and subsequent aging behavior is examined in terms of microstructures and mechanical properties.
Whereas the effect is minor on the specimens without ECAP, aging significantly affects the level of flow stress including the shape of stress-strain curve for the specimens subjected to ECAP.
It is concluded that the 100-hour aging is the optimum condition for the enhancement of the tensile stress as well as the uniform elongation: the improvement in the tensile stress is a factor of 1.5 when compared with the solution-treated specimen without ECAP while keeping a similar level in the uniform elongation.
The microstructures are observed using transmission electron microscopy and the mechanical properties including hardness are measured.
ECAP is conducted on these alloys and subsequent aging behavior is examined in terms of microstructures and mechanical properties.
Whereas the effect is minor on the specimens without ECAP, aging significantly affects the level of flow stress including the shape of stress-strain curve for the specimens subjected to ECAP.
It is concluded that the 100-hour aging is the optimum condition for the enhancement of the tensile stress as well as the uniform elongation: the improvement in the tensile stress is a factor of 1.5 when compared with the solution-treated specimen without ECAP while keeping a similar level in the uniform elongation.
Online since: March 2022
Authors: Roland Tolulope Loto, Cleophas Akinloto Loto
As a result, corrosion damage has broad economic consequences especially when factoring the financial implications [3, 4].
The physical and mechanical properties of Al can be modified precisely to the specific demands of various applications.
Gorman, 7 - Corrosion problems affecting steam generator tubes in commercial water-cooled nuclear power plants, Steam Generators for Nuclear Power Plants, Elsevier Ltd., Amsterdam, 2017, pp. 155-181
Loto, Anti-corrosion performance of the synergistic properties of benzenecarbonitrile and 5-bromovanillin on 1018 carbon steel in HCl environment, Sci.
Tobilola, Corrosion inhibition properties of the synergistic effect of 4-hydroxy-3-methoxybenzaldehyde and hexadecyltrimethylammoniumbromide on mild steel in dilute acid solutions, J.
The physical and mechanical properties of Al can be modified precisely to the specific demands of various applications.
Gorman, 7 - Corrosion problems affecting steam generator tubes in commercial water-cooled nuclear power plants, Steam Generators for Nuclear Power Plants, Elsevier Ltd., Amsterdam, 2017, pp. 155-181
Loto, Anti-corrosion performance of the synergistic properties of benzenecarbonitrile and 5-bromovanillin on 1018 carbon steel in HCl environment, Sci.
Tobilola, Corrosion inhibition properties of the synergistic effect of 4-hydroxy-3-methoxybenzaldehyde and hexadecyltrimethylammoniumbromide on mild steel in dilute acid solutions, J.
Online since: September 2019
Authors: Hamza Ouadfel, Kouddane Redouane
Introduction
It is well known that the mechanical properties of a granular material are governed by various factors
such as the characteristics of its constituent particles and conditions of deposition.
Assemblies of circular particles were satisfactory for this purpose as they do exhibit most properties of granular materials qualitatively, such as strain softening, volume increase, and the transition to a critical state at a large strain.
On the other hand, their strength is low and their deformation properties are quantitatively far too different compared to real granular materials.
Influence of Particle Shape on Engineering Properties of Assemblies of Two-Dimensional Polygon-Shaped Particles, Géotechnique, 2002, 52 (3), 209-217
Initial Fabrics and Their Relations to Mechanical Properties of Granular Material, Soils and Foundations, 1972, 12, 1, 17-36
Assemblies of circular particles were satisfactory for this purpose as they do exhibit most properties of granular materials qualitatively, such as strain softening, volume increase, and the transition to a critical state at a large strain.
On the other hand, their strength is low and their deformation properties are quantitatively far too different compared to real granular materials.
Influence of Particle Shape on Engineering Properties of Assemblies of Two-Dimensional Polygon-Shaped Particles, Géotechnique, 2002, 52 (3), 209-217
Initial Fabrics and Their Relations to Mechanical Properties of Granular Material, Soils and Foundations, 1972, 12, 1, 17-36
Online since: March 2015
Authors: Lin Jing Qin, Wen Jing Guo, Feng Xiao Huang, Xiu Li Yang
Model simplification
When analyzing the finite element model of the platform, model simplification is to simplify the real structures according to the important problems and the main factors.
Their properties are defined by specifying the section shapes and parameters directly.
And its accuracy affects the subsequent numerical analysis result directly [5].
Fig. 6 The finite element model of the platform Conclusions The geometric model of the platform is established by using UG NX, and the material properties of each component are added according to actual working condition.
The finite element with equivalent mechanical properties is applied to simulate these components.
Their properties are defined by specifying the section shapes and parameters directly.
And its accuracy affects the subsequent numerical analysis result directly [5].
Fig. 6 The finite element model of the platform Conclusions The geometric model of the platform is established by using UG NX, and the material properties of each component are added according to actual working condition.
The finite element with equivalent mechanical properties is applied to simulate these components.
Online since: September 2007
Authors: Zhi Li, Ming Song Zhang, Xiao Ling Zheng, Min You, Hai Zhou Yu
A Study on Normal Stress Distribution and Failure of Adhesively Bonded
Joint under Cleavage Loading
Xiaoling Zheng a, Mingsong Zhang b, Min You
c, Haizhou Yu
and Zhi Li
College of Mechanical and Material Engineering, China Three Gorges University,
Yichang 443002, China
a
zhengxiaoling@ctgu.edu.cn, b
zms@ctgu.edu.cn, c youmin@ctgu.edu.cn
Key words: epoxy adhesives; metal; stress distribution; cleavage; FEA
Abstract.
Introduction It is well known that the cleavage strength is one of the main properties of an adhesively bonded metal-to-metal joint.
The early studies carried out by the authors ourselves dealing with one of the neglected factors that may affect the mechanical properties of the adhesively bonded joint is the treatment condition of the metal adherends before their recycling again [5-6].
The properties of the materials used in this study are taken as follows: pure copper adherends which elastic Modulus and Poisson Ratio is 110 GPa and 0.32, for steel 1045 as 209 GPa and 0.27, and for an epoxy adhesive as 3 GPa and 0.4 respectively.
Introduction It is well known that the cleavage strength is one of the main properties of an adhesively bonded metal-to-metal joint.
The early studies carried out by the authors ourselves dealing with one of the neglected factors that may affect the mechanical properties of the adhesively bonded joint is the treatment condition of the metal adherends before their recycling again [5-6].
The properties of the materials used in this study are taken as follows: pure copper adherends which elastic Modulus and Poisson Ratio is 110 GPa and 0.32, for steel 1045 as 209 GPa and 0.27, and for an epoxy adhesive as 3 GPa and 0.4 respectively.