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Online since: March 2016
Authors: Xiao Yang Guo, Hong Hua Liu, Xiao Wei Cheng, Hong Juan Ou, Tao Gu, Zao Yuan Li
Patel and Bader Al Khayyat pointed out that the surface wettability was one of the important factors affecting the bonding quality of the interface and the improvement of surface hydrophilic property which could improve the bonding strength [14, 15].
Fig. 5 Wettability reversal properties of four systems.
Ali, Factors affecting the performance of enzyme breakers for removal of xantan-based filter-cakes.
Ikeh, Effect of cment contamination on some properties of drilling mud.
Eoff, Surfactants: additives to improve the performance properties of cements.
Online since: March 2012
Authors: K.H. Kim, W.I. Choi, W.Y. Jang, K.K. Jee
However, both recovery properties decrease after the 103 or 104 cycles, while the decreasing tendency becomes larger with a rise in aging temperature.
Typically, tension/compression coil springs for shape memory alloy(SMA) actuator are made from cold-drawn wire with an appropriate wire diameter, to which memory properties are given through heat treatment to adjust their transformation characteristics.
Therefore, recovery temperature, recovery force and recovery displacement of SMA actuators, which are important factors to be considered in SMA actuator design, are affected by cold drawing, heat treatment conditions and their chemical composition[2,3].
Recovery Properties with Thermal Cycling.
However, both recovery properties decrease after the 103 or 104 cycles, while the decreasing tendency of theirs becomes larger with a rise in aging temperature.
Online since: July 2013
Authors: Guo Zong Song, Chuan Sheng Wang, Shuai An, Shu Hong Zhao, Na Ren
The quality of mixing rubber not only affects the process workability of tread glue, but also determines the quality of finished tires.
The experiment details are as below. 1 Experiment 1.1 Experiment Method This experiment adopts the orthogonal experiment method, while taking into consideration of the effects of several factors on the single step mixing at low temperature mixing, different factors are selected at different levels.
Therefore, by the minimal experiments, the best match of the factor levels and which factor has the most influence on the single step mixing at low temperature are determined.
The experiment factors in this experiment are four: the rotor speed, the internal mixing time, the mill’s temperature, the open mixing time, with each factor are selected at four levels respectively.
In this way, the experiment scheme is determined and 16 experiments are conducted. 1.2 Materials Natural rubber, N330, Silica, ZnO, SA, Si-69, PlasticizerA, RD, 6PPD, NOBS, Sulfur,all the rubber formulas are commercially available. 1.3 Main Instruments X(S)M—1.7 Experiment Mixer, one, made in China; X(S)K—160Open mill, one, made in China, QLB—400×400×2 Vulcanizing machine, one, made in China; Mooney Viscometer, made in Taiwan Yuken; Electronic tensile testing machine, made in Taiwan Yuken. 1.4 Test Characterization The test of mechanical properties of Vulcanizates (tensile strength, tear strength and Elongation at break, etc.), determined under GB/T528-92, Dumbbell specimen,tensile speed 500mm/min, temperature 20℃, test with TS 2005 b Universal Testing Machine. 2 Results and Discussion 2.1 Data Process.
Online since: February 2014
Authors: Philippe Godignon, Narcis Mestres, Hidetoshi Miyazaki, Gemma Rius, Osamu Eryu, Yayoi Tanaka
While physical (strength, flexibility, etc.) and chemical (e.g. stability) characteristics are among the outstanding properties of all-surface-atoms graphene, the added value of graphene in electronics and optoelectronics, derives from its very special, intrinsic electronic structure, the zero band gap and linear dispersion of the p band at the Fermi level.
As a second observation, the imperfections of wafer slicing of the on-axis cut 6H-SiC crystal can lead to intrinsic defect properties of the surface in a macroscopic order (Fig. 2).
As a basic discussion about the graphene-on-SiC deposition mechanism, we contemplate that a priori a reduced number of surface structural defects, as it results from CMP pre-graphene deposition substrate conditioning, might reduce the average amount of graphene flakes formed if those factors determine the graphene nucleation sites.
Further study of the impact of CMP for specific-shape graphene deposition and the clarification of the predominant factors, e.g. step bunching, faceting, graphene nucleation points, growth propagation, etc., should be addressed.
Tanaka et al., The atomic step induced by off angle CMP influences the electrical properties of the SiC surface, Materials Science Forum 717-720 (2012) 569-572
Online since: August 2024
Authors: Christian Liguda, Tom Birkoben, Soenke Habenicht, Hans-Juergen Funke, Zh. Li, H. Fan, O. Dong, A J. Garete
Influence of Material Properties on Ruggedness Evaluation of Package Architectures for SiC Power Devices H.
It has been shown that different thermomechanical properties of the mold compounds as well as the usage of different adhesion promoter materials have a significant effect on the adhesion properties of the mold compound to the leadframe surface of the SiC power devices, which have direct impact on the ruggedness and lifetime stability.
Package architectures have to be carefully chosen, especially as the thermomechanical properties of the package and module material stack are different due to the special properties of SiC compared to conventional Si-power devices.
The type of adhesion promoter must be carefully balanced between the special properties of EMC, the underlying material surface – in this case Cu-leadframe, but also the special properties of SiC-chip surfaces have to be taken into account such as metal layers and polyimide coating.
The initial wire properties such as the yield strength, CTE, and modulus are important parameters to predict and control the wire bond performance.
Online since: October 2018
Authors: V.D. Tukhareli, O.Y. Pushkarskaya, A.V. Tukhareli
Keywords: concrete, heat-resistant properties, aggregates, aluminum oxide (electrocorundum) materials.
The chemical, grain and mineralogical analyses of the material after mechanical grinding allowed us to define it as an aggregate for concrete in order to give it heat-resistant properties.
Research is being conducted to study the basic properties of heat-resistant concrete on alumina cement.
Introduction of refractory concretes on phosphate binders instead of the traditional refractories on portland cement makes it possible to obtain a construction composition with high thermo mechanical properties in a wide temperature range for durable maintenance of the construction based on them.
Al-Hawas, Effects of key factors on compressive and tensile strengths of concrete exposed to elevated temperatures, Arabian journal for science and engineering, 39(6) (2014) 4507-4513
Online since: September 2018
Authors: I.A. Auwalu, M.A.Y. Hotoro, U.H. Jamo, D.G. Diso
Effect of Samarium Oxide on Structural and Optical Properties of Zinc Silicate Glass Ceramics from Waste Material I.A.
Given these factors, many scientists focused their interest on trivalent samarium ions as a luminescence centers in deep red emission arising from conduction band 4G5/2 → 6H9/6 transition [2].
The samples Morphological structure and optical properties of pure and doped zinc silicate were detected.
Adikan, “The effect of bismuth on the structure and mechanical properties of GeO2-PbO-Bi2O3 ternary bulk glass system,” Journal of the Ceramic Society of Japan, vol. 120, 2012, 280–285
Bakier, “Factors affecting light energy transfer in some samarium complexes,” International Journal of Photoenergy, vol. 07, 2005., 1–8
Online since: October 2015
Authors: Byeong Soo Kim, Byung Young Moon
Table 1 is shown with four controlled factors and process yield.
After the first trial, the factors affecting to the result were reconsidered and changed to increase separation capability.
Experimental factors and response variables.
If this experimental system is adopted, the recycling will be more valuable both to recycle carbon fiber and to recycle epoxy resin with CFRP recycling.The second method is to clean the recycled carbon fibers without any damage of the properties of carbon fibers as proposed by Jiang, et al. (2008).
The yield of the recycling CFRP was 95.4 wt.% with an alkali catalyst, but the mechanical properties of these fibers were 10% lower than those obtained without using an alkali catalyst (Piñero-Hernanz, et al., 2008a).
Online since: July 2011
Authors: Jun Ding, Hong Quan Sun
The fractal dimensions on surface of the reinforced concrete beam and the mechanical properties of the beam have the linear relationships perfectly.
It is considered usually that extracting the structural effective injury characteristic factor is the key to detect the structure damage.
The development status of the cracks will affect the safety, the durability and the practicality of the structure directly, and becomes a measure of the life cycle of the structure [1, 2].
Therefore, studying the crack propagation can be used for extracting the structural effective characteristic factor.
Thus, the accuracy of measuring the fractal dimension will affect the security of structure directly.
Online since: November 2013
Authors: Vladimir Luzin, Kevin Spencer, Ming Xing Zhang, Neil Matthews
Through-thickness residual stress profiles show that the stress magnitude varies significantly and depends mainly on the mechanical properties of the coating material. 1.
This would enable effective residual stress control and tailoring properties of the cold spray coatings.
Cold spray material properties Figure 1.
Third, the only strong correlation is to the mechanical properties of the material itself: the smallest stress is found in plastically soft Zn, Al, Ti and Fe, while the highest values are displayed by Ni and 316SS.
However, one would expect a complex interplay of numerous factors that can affect residual stress accumulation, which can make the former assumption invalid.
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