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Online since: October 2010
Authors: Hong Lei, Xiao Li Hu, Chao Hui Zhang
Slurry preparation is of paramount importance in chemical mechanical planarization (CMP) process.
It couples the combination effects of chemical and mechanical ones.
The rheological properties of polishing slurries affect the material removal ratio (MRR) and surface quality of the wafer.
The slurry characteristics, such as the solid particle size, the particle hardness and concentration, coupling with some other factors, for instance, the slurry viscosity, the dispersant, the lubricant etc., have important influences on the reduction of the surface roughness Ra, the waviness Wa, scratches, pits, etc.
Wa (nm) Ra(nm) Controlled value 0.8 0.80 Slurry prepared 0.5 0.41 Conclusions Slurry preparation is a key factor in affecting the CMP performances.
It couples the combination effects of chemical and mechanical ones.
The rheological properties of polishing slurries affect the material removal ratio (MRR) and surface quality of the wafer.
The slurry characteristics, such as the solid particle size, the particle hardness and concentration, coupling with some other factors, for instance, the slurry viscosity, the dispersant, the lubricant etc., have important influences on the reduction of the surface roughness Ra, the waviness Wa, scratches, pits, etc.
Wa (nm) Ra(nm) Controlled value 0.8 0.80 Slurry prepared 0.5 0.41 Conclusions Slurry preparation is a key factor in affecting the CMP performances.
Online since: October 2014
Authors: Rudeerat Suntako
ZnO affects to the vulcanization rate and the rubber product properties.
Cure characteristics and mechanical properties.
The mechanical properties are determined using an autograph (AG-IS, Shimadzu), as described by ASTM D 412 method.
The effect of synthesized ZnO nanoparticles and the conventional ZnO on mechanical properties of unfilled natural rubber are summarized in Table 4.
For the mechanical properties is increased, elongation at break and permanet set decreased with increasing synthesized ZnO nanoparticles loading.
Cure characteristics and mechanical properties.
The mechanical properties are determined using an autograph (AG-IS, Shimadzu), as described by ASTM D 412 method.
The effect of synthesized ZnO nanoparticles and the conventional ZnO on mechanical properties of unfilled natural rubber are summarized in Table 4.
For the mechanical properties is increased, elongation at break and permanet set decreased with increasing synthesized ZnO nanoparticles loading.
Online since: October 2010
Authors: Hong Hai Xu, Hong Juan Yan, Xin Min Li
Thus the importance of DCT is to research the performance improvement of
materials and the primary relations of factors affecting results of DCT.
The other factors were considered as constant.
No. 8 Fig. 1 The wearing profiles of back face Results and Discussion Mechanical Properties.
Fig. 2 The relation of different factors and VB Fig. 2 shows the relation of different factors and VB.
The results show that the soaking temperature on mechanical properties is the first factor, the second one is the soaking time, the third one is the cooling rate, and the tempering temperature is lattermost.
The other factors were considered as constant.
No. 8 Fig. 1 The wearing profiles of back face Results and Discussion Mechanical Properties.
Fig. 2 The relation of different factors and VB Fig. 2 shows the relation of different factors and VB.
The results show that the soaking temperature on mechanical properties is the first factor, the second one is the soaking time, the third one is the cooling rate, and the tempering temperature is lattermost.
Online since: June 2007
Authors: Da Yong Li, Shao Rui Zhang, Ying Hong Peng, Zhong Wei Yin, Fei Zhou
China
a
shaoruiz@sjtu.edu.cn, bdyli@sjtu.edu.cn, cyinzw@sjtu.edu.cn, dyhpeng@sjtu.edu.cn,
e
feizhou@sjtu.edu.cn
Keywords: FEM, Macro-micro combine crystal plastic, Metal forming, Texture
Abstract It has long been found that the crystal orientations would induce macroscopic anisotropy
during deformation process, and then affect the deformation properties of sheet metal.
In this paper, the anisotropy coefficients of the yield function are fitted by Taylor factor and crystal plastic model.
The anisotropy coefficients of the potentials or yield functions are determined using initial texture or experimental mechanical behavior data, and ignore the change of anisotropy properties.
These methods can real disclosure the deformation principles by real-time simulating the change of crystalline orientation and anisotropy properties.
Other material properties for FCC aluminum are assumed as: elastic modulus E=69GPa, Poisson ratio v=0.3, sheet thickness t=0.8mm.
In this paper, the anisotropy coefficients of the yield function are fitted by Taylor factor and crystal plastic model.
The anisotropy coefficients of the potentials or yield functions are determined using initial texture or experimental mechanical behavior data, and ignore the change of anisotropy properties.
These methods can real disclosure the deformation principles by real-time simulating the change of crystalline orientation and anisotropy properties.
Other material properties for FCC aluminum are assumed as: elastic modulus E=69GPa, Poisson ratio v=0.3, sheet thickness t=0.8mm.
Online since: October 2011
Authors: Ghodratollah Roudini, Sajad Gholami Shiri, Masoud Mohammadi Rahvard
Two factors give a relatively higher tensile strength.
Conclusion Tool design and welding speed parameters changes the microstructure of the welded zones which these factors influence the tensile strength of welded zones.
Microstructure, mechanical properties and residual stresses as a function of welding speed in aluminum AA5083 friction stir welds.
Effect of Friction Stir Welding Parameters on the Microstructures and Mechanical Properties of 304 Stainless Steels.
Liu.Effect of rotation speed on microstructure and mechanical properties of Ti–6Al–4V friction stir welded joints.
Conclusion Tool design and welding speed parameters changes the microstructure of the welded zones which these factors influence the tensile strength of welded zones.
Microstructure, mechanical properties and residual stresses as a function of welding speed in aluminum AA5083 friction stir welds.
Effect of Friction Stir Welding Parameters on the Microstructures and Mechanical Properties of 304 Stainless Steels.
Liu.Effect of rotation speed on microstructure and mechanical properties of Ti–6Al–4V friction stir welded joints.
Online since: February 2013
Authors: Philippe Bocher, Noureddine Barka, Abderrazak El Ouafi, Jean Brousseau
As the simulations are designed using an orthogonal matrix, average effects are not biased.Overall, the results of statistical analysis (Tables 4 and 5) show that surface temperatures are affected by the four factors.
Effects of factors on TE - MF Figure 7.
Effects of factors on TM - MF Figure 8.
Effects of factors on TE - HF Figure 9.
Effects of factors on TM - HF Summary The developed 2D axisymmetric model was exploited to determine the significance of material properties and the effect of non-equilibrium thermodynamic conditions.
Effects of factors on TE - MF Figure 7.
Effects of factors on TM - MF Figure 8.
Effects of factors on TE - HF Figure 9.
Effects of factors on TM - HF Summary The developed 2D axisymmetric model was exploited to determine the significance of material properties and the effect of non-equilibrium thermodynamic conditions.
Online since: August 2012
Authors: Cai Hong Zhuang, Hui Wang, Hai Xia Liu
And then its mechanical properties of the relevant parameters were measured to determine the optimal preparation program.
Orthogonal tests with three elements and three levels were builded to analyze these factors fully.
The factors and levels of the experiment are showed in Table 3.
The test results of mechanical properties are showed in Table 6.
As a result, polyurethane concrete also has sufficiently good mechanical properties while it has the characteristic of fast patching.
Orthogonal tests with three elements and three levels were builded to analyze these factors fully.
The factors and levels of the experiment are showed in Table 3.
The test results of mechanical properties are showed in Table 6.
As a result, polyurethane concrete also has sufficiently good mechanical properties while it has the characteristic of fast patching.
Online since: October 2012
Authors: Erween Abdul Rahim, Md. Saidin Wahab, N.A. Rahman, M.F. Uyub
The two materials are bond together to offer better mechanical properties.
Thermal damage is a direct consequence of the large difference in thermal properties of the carbon fiber and the polymer matrix [3].
The heat-affected zone (HAZ) is the area of base material, which has had its microstructure and properties altered by heat intensive cutting operations.
Factors that affecting the HAZ are pulse energy and pulse repetition rate.
Which means both of these factors interrelated, when a value is changed, then the response will also change.
Thermal damage is a direct consequence of the large difference in thermal properties of the carbon fiber and the polymer matrix [3].
The heat-affected zone (HAZ) is the area of base material, which has had its microstructure and properties altered by heat intensive cutting operations.
Factors that affecting the HAZ are pulse energy and pulse repetition rate.
Which means both of these factors interrelated, when a value is changed, then the response will also change.
Online since: December 2011
Authors: Qiang Wang, Xu Guang Min, Ying Ying Zeng
The function relationship between the experimental factors and response surface is shown by the regression equation.
It affects the blade cooling, thus affects the tool's durability.
Under the same tool material conditions, the values of cutting speed, feed and depth are not determined by one factor, the ceramic processing methods, processing requirements and parts material properties etc should be considered, to get the optimized best value.
Feed is the main factors to the parts surface roughness, smaller feed must be selected to improve the surface quality [8].
Cutting speed is the main factor to affect the machining performances.
It affects the blade cooling, thus affects the tool's durability.
Under the same tool material conditions, the values of cutting speed, feed and depth are not determined by one factor, the ceramic processing methods, processing requirements and parts material properties etc should be considered, to get the optimized best value.
Feed is the main factors to the parts surface roughness, smaller feed must be selected to improve the surface quality [8].
Cutting speed is the main factor to affect the machining performances.
Online since: April 2011
Authors: Luciano Henrique de Almeida, Carlos Roberto Grandini, Durval Rodrigues Júnior
When metals that present bcc crystalline structure receive the addition of interstitial atoms as oxygen, nitrogen, hydrogen and carbon, they undergo significant changes in their physical properties because they are able to dissolve great amounts of those interstitial elements, and thus form solid solutions.
With the addition of substitutional solute, interactions between the two types of solutes (substitutional and interstitial) were observed, considering that the random distribution of the interstitial atoms was affected by the presence of substitutional atoms.
Interstitial diffusion coefficients, pre-exponential factors and activation energies were calculated for oxygen in this alloy.
When metals that have bcc structure receive the addition of interstitial atoms such as oxygen, nitrogen, hydrogen and carbon, they suffer significant changes in their physical properties because they are able to dissolve great amounts of those elements, thus forming solid solutions.
Mechanical spectroscopy spectrum for the Nb9Ta sample in the as-received condition [6] Figure 2.
With the addition of substitutional solute, interactions between the two types of solutes (substitutional and interstitial) were observed, considering that the random distribution of the interstitial atoms was affected by the presence of substitutional atoms.
Interstitial diffusion coefficients, pre-exponential factors and activation energies were calculated for oxygen in this alloy.
When metals that have bcc structure receive the addition of interstitial atoms such as oxygen, nitrogen, hydrogen and carbon, they suffer significant changes in their physical properties because they are able to dissolve great amounts of those elements, thus forming solid solutions.
Mechanical spectroscopy spectrum for the Nb9Ta sample in the as-received condition [6] Figure 2.