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Online since: January 2006
Authors: Tung Chuan Wu, R.Y. Wang, P.J. Cheng, M.F. Chen, Min Chie Chou, S.C. Shen, C.T. Pan
Introduction The resolution of traditional molds fabricated by mechanical manufacture is limited.
Light source of lithography affects the aspect ratio and collimation of the structure.
The plating concentration and content of electroplating affect physical and mechanical properties of the molds.
The Ni/Co alloy molds have the properties of extra-high hardness and low residual stress.
Thus, Ni/Co alloy electroplating process is a key factor to manufacturing metal micro-punch molds.
Online since: July 2013
Authors: Zhi Yong Li, Li Li, Zong Wei Niu
Because the process of blade in electrochemical machining(EMC) can be effected by many factors, such as blade shapes, machining electrical field, electrolyte fluid field and anode electrochemical dissolution, different ECM machining parameters maybe result in great affections on blade machining accuracy.
Being a non-mechanical metal removal process, ECM is capable of machining any electrically conductive materials with high stock removal rates regardless of their mechanical properties, such as hardness, elasticity and brittleness.
All machining parameters involving electrical field distribution, electrolyte flow field and electrochemical dissolution characteristics may affect the stability of ECM and shape accuracy.
According to the basic principle of ECM, electrolyte conductivity is mainly affected by two factors, electrolyte temperature and electrolyte bubble rate.
If we consider the two factors together, the value of at position along electrolyte flow direction can be impressed as (11) From (6) to (11), is conductivity temperature coefficient; current density; electrolyte density; electrolyte flow rate; specific heat of electrolyte; volumetric electrochemical equivalent of hydrogen gas; correction factor of hydrogen gas; resistance coefficient of electrolyte flow; hydraulic diameter; According to (11), the at position along electrolyte flow direction can be calculated precisely.As mentioned above, the most important EMC process parameters are applied voltage, tool feed rate, electrolyte temperature, electrolyte pressure and ECM initial gap.
Online since: June 2017
Authors: Hai Tao Yang, Fu Liang Shang, Sheng Hui Xie, Ling Gao, Ting Ting Xu, Wei Peng, Zuo Xiang Zhu
The morphologies, structure, densification behavior, mechanical and electrical properties of the sintered ceramic targets with different doping concentrations were investigated.
And, some new preparations, properties and influencing factors of NZO sputtering target materials were discussed, but the related research needs to be further and deeper.
The morphologies, structure, densification behavior, mechanical and electrical properties of the sintered ceramic targets with different doping concentrations were investigated.
Mechanical properties of NZO ceramic target.
Effect of Doping Concentrations on Properties of Ga-Ti Co-Doped ZnO (GTZO) Targets[C]// 2016:498-504
Online since: February 2013
Authors: Xiao Dong Zeng, Chang Qing Cao, Cheng Kang Yao
Theoretical analysis and experimental research on the ray trajectories, assembly situation and polarized properties of light were carried out.
In this paper, a 3D FEM has been established to analyze modulation depth in many aspects such as structure, prism material, assembly craft and polarized properties.
By using the finite element method, the practical refractive index change and the propagation properties under the continuous varying stress could be obtained.
The analysis of output light’s characteristic is mainly concentrated in polarized properties.
Polarized light properties analysis.
Online since: February 2013
Authors: Jacek Dziurdź
Measured values can be affected i.a. by the energy of random effects or other, less important components of the signal.
In the paper the author describes the method of minimization of the impact of disturbances on signals being analysed using basic properties of autocorrelation function.
These are not the only properties of these functions.
In addition, this function value depends on several other factors such as influences of random and non-linear effects.
However, the effectiveness of this analysis for real systems can be only obtained when properties of these functions are combined together.
Online since: September 2012
Authors: Suhas Joshi, Uday Dabade
These characteristics in machining of MMCs tend to adversely affect the machined surface quality/integrity.
The driving force behind the development of these composites is their ability to produce tailored mechanical and physical properties for specific applications.
Their properties such as thermal resistance, specific strength, wear resistance, etc. can be altered by changing their fabrication techniques, volume and size of reinforcement in them.
In hot machining, an optimum machining temperature is dependent on the physical properties of work material [13].
[9] Krabacher, E.J. and Merchant, M.E., “Basic Factors in Hot-Machining of Metals”, Transactions ASME, Vol.73, 1951, pp761–776
Online since: July 2011
Authors: Jing Jie Zhang, Chong Hai Xu, Zhen Yu Jiang, Ming Dong Yi
The result indicated that the thermal expansion coefficient was the primary factor which could affect the tensile stress of ceramic extrusion die.
The ceramics especially the high-performance nano-ceramic[1,2] have high hardness, good abrasion resistance, high chemical stability and high temperature mechanical properties[3] etc and have already widely applied in the die material manufacture now.
As the flexural strength of ZrO2/TiB2/Al2O3 ceramic mould materail is 1055Mpa, its admissible stress is only 300Mpa while the safty factor is 3.5[6].
References [1] Lian Gao, Wei Li, Nano Ceramics, Beijing: Chemical Industry Press, 2002(In Chinese) [2] Dongtao Jiang, Omer Van der Biest, and Jef Vleugels, ZrO2-WC Nanocomposites with Superior Properties.
Rare Metal Materials And Engineering, Vol 36, p.770-773, 2007(In Chinese) [4] Richerson D W, Modern Ceramic Engineering, Properties, Processing and Use in Design, New York: Marcel dekker publication Inc, 1992 [5] Zuoqian Cai, Lian Wang, and Gen Yang, Ceramic Material.
Online since: January 2013
Authors: Jing Hong Du, Ping Zhou
Molecular structure of NMAM contains both unsaturated vinyl with the polymerization properties and the hydroxymethyl group.
The preparation and reaction conditions of slurry should be considered comprehensively in order to obtain the green bodies with better properties.
We should reduce the monomer dosage as much as possible in case of no affecting products’ properties, which was helpful to reduce organic materials of slurry and shorten binder burn-out time.
High strength can make ceramic green body keep good mechanical properties and also reduce waste products greatly caused by lower strength of green body in mechanical process.
Through discussing main influence factors about polymerization of NMAM monomer, the suitable conditions for PMN-PZT piezoelectric ceramic by gelcasting can be obtained: monomer concentration was 10~15wt%, initiator and catalyst content were respectively 0.4~0.5vol% and 0.4vol%, pH value of slurry was about 10.
Online since: June 2014
Authors: Christian Chimani, Salar Bozorgi, Christoph Angermeier, Kevin Anders
Mechanical properties Table 2 shows the variation in the comparison of mechanical properties and impact energy of different alloys as a function of heat treatment.
No significant differences were indicated in the mechanical properties of these alloys in as-cast state.
Gruzleski, Factors to consider in modification.
Gruzleski, Impact properties of Al–Si foundry alloys.
StJohn, Effect of a short solution treatment time on microstructure and mechanical properties of modified Al–7 wt.% Si–0.3 wt.% Mg alloy.
Online since: May 2011
Authors: Li Xin Zhang, Chang Hong Li
Introduction Water inrush risk is affected by a variety of factors which are ambiguous among the degree of sign boundaries, different in effect degree, non-linear relationship.
Analysis of Water Inrush Factors of Mine Water inrush is induced by many factors, but it must have three conditions of water source, water yield and water-conducting channel.
Second, the distance between ore layer and water-bearing layer is shortened due to hanging walls and footwalls of faults slip, or the water-resisting properties is partly or totally fail due to ore layer of one wall in contact with water-bearing layer of another wall.
Theoretically, U should include all influencing factors.
Its membership function showed a linear relationship as follow[8]: u3= 0 (p-0.5)/2 1 p≤0.5 0.52.5 (4) Where p is water pressure, MPa (4) Resisting and blocking capacity of water-resisting layer Water-resisting layer play a blocking role in water inrush, its water-blocking ability is determined by its thickness, mechanical properties of rock and the integrity of water-resisting layer.
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