Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: September 2014
Authors: Ren Bo Song, Yong Jin Wang, Peng Wang, Ya Ping Li
Sloping plate angle and sloping plate length can affect the shear strength and shear time of the flow alloy on the sloping plate and thus influence alloy microstructure.
A better understanding of structural changes during rapid quenching from the semi-solid state is not only important for the characterization of thixotropic properties, but also enables targeted structural design to optimize mechanical and physical properties.
In addition, Mean equivalent diameter is D=2(A/π)1/2; Shape factor is F=4πA/L2.
Accordingly, the microstructure has relatively high shape factor and fine grains with the shape factor of 0.72 , the equivalent diameter of 52.45μm, so the slurry is more ideal.
The mean equivalent diameter and the shape factor of primary austenite is 50.8μm and 0.69; The thickness of carbide network reaches 5.12μm.
A better understanding of structural changes during rapid quenching from the semi-solid state is not only important for the characterization of thixotropic properties, but also enables targeted structural design to optimize mechanical and physical properties.
In addition, Mean equivalent diameter is D=2(A/π)1/2; Shape factor is F=4πA/L2.
Accordingly, the microstructure has relatively high shape factor and fine grains with the shape factor of 0.72 , the equivalent diameter of 52.45μm, so the slurry is more ideal.
The mean equivalent diameter and the shape factor of primary austenite is 50.8μm and 0.69; The thickness of carbide network reaches 5.12μm.
Online since: October 2020
Authors: Zheng Yi Jiang, Hai Bo Xie, Mahadi Hasam, Hamidreza Kamali, Fang Hui Jia
The optimal bonding parameters were attained and the obtained mechanical properties and bonding strength of the composite were analysed.
Thus, the effect of changing temperature is found to be the most important factor as this caused the porosity to reduce considerably, resulting in an increase in density and mechanical properties.
The mechanical properties of the composite were analysed by density, porosity and microhardness.
The influences of temperature, time and pressure were analysed on the mechanical properties of the sintered carbides and bonding shear strength.
It is found that the increase of the sintering parameters improves the mechanical properties and bonding shear strength.
Thus, the effect of changing temperature is found to be the most important factor as this caused the porosity to reduce considerably, resulting in an increase in density and mechanical properties.
The mechanical properties of the composite were analysed by density, porosity and microhardness.
The influences of temperature, time and pressure were analysed on the mechanical properties of the sintered carbides and bonding shear strength.
It is found that the increase of the sintering parameters improves the mechanical properties and bonding shear strength.
Online since: May 2012
Authors: Shun Jian Xu, Yu Feng Luo, Wei Zhong, Zong Hu Xiao, Xiao Yun Liu
Investigation of hexagonal boron nitride for application as counter electrode in dye-sensitized solar cells
Shunjian Xu1, a, Yufeng Luo1, 2, b, Wei Zhong1, c, Zonghu Xiao 1, d, Xiaoyun Liu2, e
1 School of New Energy Science and Engineering, Xinyu University, Xinyu 338004, China
2 School of Mechatronics Engineering, Nanchang University, Nanchang 330031, China
asjxu@yahoo.cn, blyfyel@126.com, czhongweiwen@126.com, dxzh_121@163.com, e348808011@qq.com
Keywords: Hexagonal boron nitride; Counter electrode; Dye-sensitized solar cell; Photovoltaic properties; Potential application.
Therefore, the crystal structure is not a crucial factor to select the catalytic material for a counter electrode in DSCs.
High efficiency of the former is attributed to high short circuit photocurrent density, open circuit voltage as well as fill factor.
This may further explain that the crystal structure is not a crucial factor to select the catalytic material for a counter electrode in DSCs.
Moreover, the Jsc and the Voc are also evidently affected by the characteristics of catalytic material.
Therefore, the crystal structure is not a crucial factor to select the catalytic material for a counter electrode in DSCs.
High efficiency of the former is attributed to high short circuit photocurrent density, open circuit voltage as well as fill factor.
This may further explain that the crystal structure is not a crucial factor to select the catalytic material for a counter electrode in DSCs.
Moreover, the Jsc and the Voc are also evidently affected by the characteristics of catalytic material.
Online since: March 2024
Authors: Papot Jaroenapibal, Chatpawee Hom On, Jirapan Srimaneerat, Panya Wintachai, Nujira Kothanamn, Premchai Moolla, Komsak Harachai
To investigate the effects of electrodeposition current density on the properties of the Ni-P/diamond composite coating, scanning electron microscopy (SEM), hardness testing, and electrochemical testing were employed.
Electrodeposited composites based on Ni-P alloys with different solid particles are promising as protective coatings due to their outstanding corrosion and wear resistance properties.
The incorporation of diamond particles in Ni-P deposits has been shown to significantly improve properties such as hardness, corrosion, and wear resistance of the coatings [19,20].
The graph was plotted to display the factors that may independently contribute to the coating hardness.
It has been hypothesized that some competing forces are at work during the co-electrodeposition process that may affect the thickness and diamond content of the coating.
Electrodeposited composites based on Ni-P alloys with different solid particles are promising as protective coatings due to their outstanding corrosion and wear resistance properties.
The incorporation of diamond particles in Ni-P deposits has been shown to significantly improve properties such as hardness, corrosion, and wear resistance of the coatings [19,20].
The graph was plotted to display the factors that may independently contribute to the coating hardness.
It has been hypothesized that some competing forces are at work during the co-electrodeposition process that may affect the thickness and diamond content of the coating.
Online since: February 2011
Authors: Kuang Hua Fuh, Wei Ching Yeh, Tsuh Siao Chu, Shiuan Sheng Wang, Kuan Hun Chen
The quality of the blanking product is affected not only by the mechanical properties but also by the ductile fracture process in shearing band between the punch and the die.
The Table 1 and Table 2 show the blanking conditions and material properties used in the analysis.
Material properties Experiment Simulation Blanking speed,(mm/min) 1 1 Blank holding force,(kN) 4.0 4.0 Diameter of die,(mm) 30.0 30.0 Diameter of punch, 29.4(0.10t) 29.4(0.10t) ,(mm) (clearance) 29.7(0.05t) 29.7(0.05t) Punch and die edge radii,(mm) — 0.064 Coefficient of friction, μ — 0.2 Sheet thickness, t(mm) 3 3 Young’s modulus(GPa) 210 Yield strength(MPa) 218 Ultimate tensile strength(MPa) 495 Strength coefficient, F(MPa) 831 Work hardening exponent, n 0.215 Poisson's ratio, ν 0.29 Fig. 2 Model of FE mesh.
These factors show that the reduction in mean flow stress results from the separation of the die from the sheet, and have positive effect on the quality of edge profile.
Hambli : International journal of Mechanical Sciences, 44(2002), pp.2089
The Table 1 and Table 2 show the blanking conditions and material properties used in the analysis.
Material properties Experiment Simulation Blanking speed,(mm/min) 1 1 Blank holding force,(kN) 4.0 4.0 Diameter of die,(mm) 30.0 30.0 Diameter of punch, 29.4(0.10t) 29.4(0.10t) ,(mm) (clearance) 29.7(0.05t) 29.7(0.05t) Punch and die edge radii,(mm) — 0.064 Coefficient of friction, μ — 0.2 Sheet thickness, t(mm) 3 3 Young’s modulus(GPa) 210 Yield strength(MPa) 218 Ultimate tensile strength(MPa) 495 Strength coefficient, F(MPa) 831 Work hardening exponent, n 0.215 Poisson's ratio, ν 0.29 Fig. 2 Model of FE mesh.
These factors show that the reduction in mean flow stress results from the separation of the die from the sheet, and have positive effect on the quality of edge profile.
Hambli : International journal of Mechanical Sciences, 44(2002), pp.2089
Online since: November 2017
Authors: Ei Yamamoto, Nobuhiro Kato, Shigeki Hontsu
These resin materials have favorable handling properties, and can be easily attached to the original tooth.
Previously, it was reported that the thickness of the HAp layer was one of the most important factors to produce well-crystallized coatings on titanium substrates under hydrothermal conditions [15].
Spector, Compressive properties of cancellous bone defects in a rabbit model treated with particles of natural bone mineral and synthetic hydroxyapatite, Biomaterials. 22 (2001) 1953–1959
Ebihara, Effects of substrate temperature on the properties of Ga-doped ZnO by pulsed laser deposition, Thin Solid Films. 513 (2006) 90–94
Xiao, Effects of substrate temperature on the properties of CdTe thin films deposited by pulsed laser deposition, Surface and Coatings Technology. 213 (2012) 84–89.
Previously, it was reported that the thickness of the HAp layer was one of the most important factors to produce well-crystallized coatings on titanium substrates under hydrothermal conditions [15].
Spector, Compressive properties of cancellous bone defects in a rabbit model treated with particles of natural bone mineral and synthetic hydroxyapatite, Biomaterials. 22 (2001) 1953–1959
Ebihara, Effects of substrate temperature on the properties of Ga-doped ZnO by pulsed laser deposition, Thin Solid Films. 513 (2006) 90–94
Xiao, Effects of substrate temperature on the properties of CdTe thin films deposited by pulsed laser deposition, Surface and Coatings Technology. 213 (2012) 84–89.
Online since: October 2010
Authors: Fu Hai Li, Yue Zhong Ye, Yan Ke Yang
Introduction
In severe cold area, freezing and thawing is one of main factors which lead concrete damage.
So, the property of frost-resistant is one important durability index [1].
The physical and mechanical properties of concrete are studied after different times of freezing and thawing.
This phenomenon leads to crack come into being in the interior of sample, which can affect compressive property directly.
The water cement ratio not only affects interior water yield, but also affect strength before and after freezing and thawing cycle.
So, the property of frost-resistant is one important durability index [1].
The physical and mechanical properties of concrete are studied after different times of freezing and thawing.
This phenomenon leads to crack come into being in the interior of sample, which can affect compressive property directly.
The water cement ratio not only affects interior water yield, but also affect strength before and after freezing and thawing cycle.
Online since: January 2013
Authors: Zheng Gui Zhu, Tao Li, Ya Mei Zhang
AAS has many advantages such as good mechanical properties, acid and alkali resistance, sulfate corrosion resistance, freeze-thaw resistance, low hydration heat and porosity [4].
With the optimum amount of rubber, the negative effect of rubber on mechanical properties was balanced by the alkalinity effect.
However, when excessive rubber was added, over 5% as found in this study, the alkalinity effect is insufficient in balancing the negative effect of low strength of rubber on the mechanical properties of AASM.
So that, both C-S-H gel characteristics and pore size distribution of AAS are the critical factors to generate higher shrinkage.
Malhotra, Properties and durability of alkali-activated slag concrete, ACI Mater J. 89 (1992) 509-516
With the optimum amount of rubber, the negative effect of rubber on mechanical properties was balanced by the alkalinity effect.
However, when excessive rubber was added, over 5% as found in this study, the alkalinity effect is insufficient in balancing the negative effect of low strength of rubber on the mechanical properties of AASM.
So that, both C-S-H gel characteristics and pore size distribution of AAS are the critical factors to generate higher shrinkage.
Malhotra, Properties and durability of alkali-activated slag concrete, ACI Mater J. 89 (1992) 509-516
Online since: March 2017
Authors: Z.F. Yue, M.Y. Cao, S.W. Li, Z.Y. Yu, Xin Mei Wang
Introduction
Nickel-based single crystal superalloys are used as gas turbine blade materials for their excellent mechanical properties at high temperatures.
It has been pointed out that the γ/γ′ microstructures substantially affect the mechanical and creep behavior of the superalloys.
Since the microstructure is one of the key factors determining the material properties, it is necessary to study the influences of different γ/γ′ microstructures.
The elastic properties of the two phases are obtained from references [3].
Results and discussion Average creep properties are given as the macro-creep strain evolution with time, see Fig. 2.
It has been pointed out that the γ/γ′ microstructures substantially affect the mechanical and creep behavior of the superalloys.
Since the microstructure is one of the key factors determining the material properties, it is necessary to study the influences of different γ/γ′ microstructures.
The elastic properties of the two phases are obtained from references [3].
Results and discussion Average creep properties are given as the macro-creep strain evolution with time, see Fig. 2.
Online since: October 2011
Authors: A. Sarkar, U. Ray, S. Sen, B. Roychowdhury, N. Barman
Introduction
The thixocasting process is a novel manufacturing technique to produce near net shape components with good mechanical and metallurgical properties.
However, the evolution of latent heat during melting affects the temperature distribution significantly.
The thermo-physical properties of the billet material used in simulation are summarized in Table 1.
Thermophysical properties and system data Properties Value Density (r) 2550 Kg/m3 (solid) 2390 Kg/m3 (liquid) Specific Heat (cp) 1170W/m2-oC (solid) 1070W/m2-oC (liquid) Thermal Conductivity (k) 120 W/m-K Absolute Permeability, 4p x 10-7 Relative Permeability, 1 Specific Resistance (rm ) 2.62 x 10-8 Ω-m System Data Billet Radius (Rb) 45 mm Billet Length (L) 50 mm Heating Coil Diameter ( d) 5 mm Heat Transfer Coefficient (h) 30 W/m2-K Calculation of the Source Terms.
The thermo-physical properties and system data used in the simulation are taken from the Table I.
However, the evolution of latent heat during melting affects the temperature distribution significantly.
The thermo-physical properties of the billet material used in simulation are summarized in Table 1.
Thermophysical properties and system data Properties Value Density (r) 2550 Kg/m3 (solid) 2390 Kg/m3 (liquid) Specific Heat (cp) 1170W/m2-oC (solid) 1070W/m2-oC (liquid) Thermal Conductivity (k) 120 W/m-K Absolute Permeability, 4p x 10-7 Relative Permeability, 1 Specific Resistance (rm ) 2.62 x 10-8 Ω-m System Data Billet Radius (Rb) 45 mm Billet Length (L) 50 mm Heating Coil Diameter ( d) 5 mm Heat Transfer Coefficient (h) 30 W/m2-K Calculation of the Source Terms.
The thermo-physical properties and system data used in the simulation are taken from the Table I.