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Online since: June 2004
Authors: Gabriel Ferro, Thierry Chassagne, André Leycuras, H. Haas, Yves Monteil, Hugues Mank
Introduction Though far from the structural quality of α-SiC crystals, the 3C-SiC layers grown on Si substrates have properties which are sufficient for many applications ranging from various mechanical sensors to simple electronic devices.
The mechanical stress induced by this discrepancy results in a bow roughly proportional to the layer thickness and can reach several hundreds of micrometers for a 5 µm thick layer on a standard 2" Si wafer.
In the same way, the c and d curves show that the bow is reduced by a factor of four or more for a same SiC layer thickness deposited on a checkerboard patterned substrate (first carbonization in tension and then in compression).
This means that the presence of adjacent areas with different morphology and opposite strain sign does not affect the local growth mechanism.
However, the tensed zone is still rougher than the compressed one but this difference does not seem to affect the polishing of each zone.
Online since: September 2011
Authors: Yao Xing Jiang, Bao Qi Zuo, Jin Fa Ming
UV radiation is one of the major causes of natural aging of textile materials [5], especially B.mori silk fiber easily happening aging phenomenon, resulting in yellowing and other properties loss, such as luster, mechanical property, thermal property, and amino acid contents, etc.
Mechanical Properties Analysis.
The UV irradiation leads to fiber breakage in the sample surface and, consequently, there is loss in mechanical properties especially in breaking strength.
This result confirms again the mechanical degradation described previously in the mechanical properties analysis summary.
In addition, this surface phenomenon during natural and accelerated aging process affects mechanical property and amino acid contents.
Online since: September 2003
Authors: Cheng Yong Wang, Xin Wei, Ha Llong Yuan, Z.H. Xie
The formation of cracks or chipping and crushed zone depends on the properties of rocks.
The Factors Affecting the Formation and Propagation of Cracks in Diabase Cutting Process.
The cutting processes of coarse grain granite are more remarkably affected by the mineral properties.
The Properties of the Crushed Zone.
Effects of Mineral Properties on the Propagation of Microcracks.
Online since: October 2023
Authors: Munir Kadernani, Khaled Abou-El-Hossein, F.A Oyekunle, Philhelene Chikamhi, Kumaran Kadirgama
Generally, one can say that the imprint and traces of all static and dynamic factors during diamond cutting can be investigated by looking into the topography of the machined surface.
A good quality surface can enhance the functionality of optical components as the material’s optical properties are proportional to the surface finish.
In addition, the surface roughness also affects several other functional attributes of optical elements such as the coefficient of friction, material wear properties, light reflectivity, heat transmission, coating and the ability to distribute and hold a lubricant [4, 5].
These include the degrees of freedom (DF), F-values (F) and probability (P) of each factor.
Claesson: Mechanical Systems and signal processing 11 (3) (1997), pp.459-489
Online since: December 2014
Authors: Tian Li, Zhi Zhen Peng, Yan Cheng Fan, Xi Ming Tang, Chen Guang Kong, Qin Yin
There are many influencing factors on boric acid corrosions, including the impurities inside the material, oxygen concentration, temperature and pressure [3].
It’s greatly significant to find out the principles of boric acid corrosion and the influencing factors on boric acid corrosions.
At the earlier operation stage of PWRs, material properties of the nuclear equipment were well-balanced, and less borated water leakage occur in borated water system.
Thirdly, check the affected equipment and verify whether borated water was still on the equipment.
Lastly, check the materials of the affected component.
Online since: December 2024
Authors: Vu Anh Doan, Hoa Nguyen, Hoan Nguyen Cong
Polystyrene-based adhesives exhibit excellent adhesion, as well as physical and mechanical properties, making them suitable for application to various materials.
Experimental planning is a method used to study the simultaneous influence of multiple factors on the obtained results.
Characterization of adhesion properties between two wood plates.
Thermal properties of the adhesive film.
Thomas, Thermoplastic elastomers from blends of polystyrene and natural rubber: morphology and mechanical properties, Eur.
Online since: December 2012
Authors: Li Rong Huang, Zheng Zheng He, Zheng Liu
There are many repair methods, of which thermal spraying, surfacing welding, and electroplating are main technologies according to chemical composition and mechanical properties of shafts to analyze the special structural organization, and the bonding between coating and substrate. 2.1 Thermal spraying Thermal spraying is a kind of surface roughing technologies, is an important part of the surface engineering technologies.
Surfacing Welding Surfacing welding is the process that certain performance alloy deposits onto the surface of the substrate by use of heat resource, which gives special properties of material of the substrate or restore parts the original shape and size [5~8].
Surfacing welding is one of effective repair methods for shafts in boats and ships due to wear, so when surfacing welding, there are the following factors considered: (1)lower dilution rate; (2)higher deposited rate; (3)size, shape, complexity and batch of workpiece; (4)the lowest cost.
Plating can effectively repair wear mechanical parts[9,10].
There is a shortcoming that mechanical properties can change with the increasing thickness of the coating, and deposited rate can slower.
Online since: October 2012
Authors: Chun Hui Chung
Abrasive Distribution of the Fixed Diamond Wire in Wire Sawing Process Chunhui Chung Department of Mechanical Engineering, National Taiwan University of Science and Technology, No.43, Sec. 4, Keelung Rd., Taipei, 106, Taiwan chunhui.chung@mail.ntust.edu.tw Keywords: Diamond wire saw; wafering; silicon wafer Abstract.
The flexibility of the wire will affect the performance of the slicing process such as the loading on the abrasives and the material removal rate.
Fig. 4 Analysis of wire tension around an abrasive grit Simulation Results TABLE I Mechanical properties of the silicon in the simulation [9, 10] Young’s Modulus Hardness Fracture Toughness E = 127 GPa H = 10 GPa Kc = 0.7 MPa The mechanical properties of the silicon utilized in this study are listed in Table 1.
However, the results show that the abrasive interval does not affect the wire tension at exit significantly.
Therefore, the abrasive interval is an important factor which affects the slicing performance manifoldly.
Online since: January 2012
Authors: Robert Schaller, Iva Tkalcec-Vaju, Daniele Mari
The variation of the Au:Ag:Cu ratio results in alloys of very different colour and mechanical properties [1].
Mechanical spectroscopy has proven to be a very sensitive tool for studying phase transformations in gold alloys.
In the white gold alloys, the precipitation affects the peak attributed to the grain boundaries [4].
The material’s hardness is not affected by the phase decomposition, within the precision of the measurement.
In the 14-carat alloy, the phase decomposition into a copper-rich and a silver-rich phase influences the anelastic properties.
Online since: September 2020
Authors: Oleksandr Shapoval, Iurii Savchenko, Oleg Markov, Volodymyr V. Drahobetskyi, Anna Gurenko
By its properties, zirconium is very close to titanium, and therefore the manufacture of tubes from this combination, as well as pure titanium, is considerably difficult.
Bimetallic tube products have special physicochemical properties which cannot be obtained in single-layer products but only through special compositions.
Its perspective is emphasized by the fact that aluminum and magnesium having similar properties are not recommended at elevated temperatures up to several hundred degrees, at which zirconium still sustains its strength.
The valuable qualities of bimetal stainless steel + zirconium, combining the strength and the indicated properties of zirconium, make it possible to adopt this bimetal in the construction of atomic reactors [15-19].
In terms of their chemical properties, zirconium is very similar to titanium, and the formation of their alloys largely submit to the same laws, therefore the manufacture of tubes from this combination, as well as pure titanium, is considerably difficult.
Showing 17461 to 17470 of 25958 items