Articles de revues : « Bonding ratio »

1

Li, Hong, Miao-Quan Li, Wei-Xin Yu et Hong-Bin Liu. « Significance and interaction of bonding parameters with bonding ratio in press bonding of TC4 alloy ». Rare Metals 35, n^o 3 (1 août 2014) : 235–41. http://dx.doi.org/10.1007/s12598-014-0330-3.

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Li, Qingbo, Hongfei Wang, Mowen Xie et Weinan Liu. « Calculation Method of Bonding Section of Joint Surface of Dangerous Rock Mass Based on Amplitude Ratio ». Shock and Vibration 2020 (30 novembre 2020) : 1–9. http://dx.doi.org/10.1155/2020/8820639.

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In this study, through an analysis of vibration response characteristics of joint surface stiffness on dangerous rock mass, the relationship formula between amplitude ratio of the dangerous rock mass to the bedrock and the length of the bonding section of the joint surface is determined. The stability of the rock mass can be evaluated by combining the formula with the existing rock-mass limit equilibrium theory. This study proposes the existence of a resonance bonding length for the dangerous rock mass. When the length of the bonding section reaches the resonance bonding length, the dangerous rock mass has the largest response to the bedrock vibration. The study found that when the length of the bonding section of the dangerous rock mass is longer than the resonance bonding length, the amplitude ratio increases with the decrease of the bonding section and increases with the increase of the vibration frequency of the bedrock. When the length of the bonding section of the dangerous rock body is shorter than the resonance bonding length, the amplitude ratio decreases with the decrease of the bonding section and decreases with the increase of the vibration frequency of the bedrock. Indoor experiments were conducted by collecting the vibration time-history curves of rock blocks and stone piers and performing analysis and calculation, which proved the accuracy of the analytical results. Through the amplitude ratio of the dangerous rock mass and the bedrock, the bonding length can be calculated. This method can improve the calculation accuracy of the stability coefficient K of the dangerous rock mass.

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Guo, Shan Shan, Yuan Yuan Jiang, Hao Zeng, Xiao Yong Wan et Yong Jun Li. « Diffusion Bonding Performance of Copper Target for 300mm Integrated Circuit ». Materials Science Forum 1035 (22 juin 2021) : 692–97. http://dx.doi.org/10.4028/www.scientific.net/msf.1035.692.

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Ultra-pure copper sputtering target is a key material widely used in large-scale integrated circuits with 90-28 nm feature size. The copper target for 300 mm integrated circuit requires a reliable diffusion bonding between the ultra-pure copper target and the copper alloy backplate. The bonding ratio and bonding strength of diffusion bonding should reach over 99% and 80 MPa respectively. In this paper, the ascendant structure of electron beam welding united diffusion bonding with high quality was designed. The ultra-pure copper target and the C18000 copper alloy backplate were machined to coordinating size, meanwhile the backplate underwent surface treatment of toothed/smooth, ion cleaning, magnetron sputtering coating, then the combination of target and the backplate was proceeded electron beam welding and diffusion bonding. Metallographic microscope, scanning electron microscope (SEM), mechanical tensile machine, C-scan flaw detector were used to analyze the bonding properties including interface microstructure, bonding strength and bonding ratio. The results show that the bonding ratio of copper target was above 99%, and the bonding strength was up to 80-160 MPa.

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Mei, Han, Lihui Lang, Xiaoxing Li, Hasnain Ali Mirza et Xiaoguang Yang. « Prediction of Tensile Strength and Deformation of Diffusion Bonding Joint for Inconel 718 Using Deep Neural Network ». Metals 10, n^o 9 (18 septembre 2020) : 1266. http://dx.doi.org/10.3390/met10091266.

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Due to the acceptable high-temperature deformation resistance of Inconel 718, its welding parameters such as bonding temperature and pressure are inevitably higher than those of general metals. As a result of the existing punitive processing environment, it is essential to control the deformation of parts while ensuring the bonding performance. In this research, diffusion bonding experiments based on the Taguchi method (TM) are conducted, and the uniaxial tensile strength and deformation ratio of the experimental joints are measured. According to experimental data, a deep neural network (DNN) was trained to characterize the nonlinear relationship between the diffusion bonding process parameters and the diffusion bonding strength and deformation ratio, where the overall correlation coefficient came out to be 0.99913. The double-factors analysis of bonding temperature–bonding pressure based on the prediction results of the DNN shows that the temperature increment of the diffusion bonding of Inconel 718 significantly increases the deformation ratio of the diffusion bonding joints. Therefore, during the multi-objective optimization of the bonding performance and deformation of components, priority should be given to optimizing the bonding pressure and duration only.

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Yoshida, Yoshinori, Takamasa Matsubara, Keisuke Yasui, Takashi Ishikawa et Tomoaki Suganuma. « Influence of Processing Parameters on Bonding Conditions in Backward Extrusion Forged Bonding ». Key Engineering Materials 504-506 (février 2012) : 387–92. http://dx.doi.org/10.4028/www.scientific.net/kem.504-506.387.

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In this study, conditions of metallurgical bonding between steel and aluminum in cold forging process is investigated. Two-layered cylindrical cup of the materials is produced in cold backward extrusion in five processing velocity conditions. Small tensile test specimens are cut off at the bonding boundary in the product using a wire-cutting machine and the bonding strength on the boundary is measured in tensile test using the specimens. Fractured contact surfaces are observed with an electron microscope for investigation of bonding. Finite element analyses for the backward extrusion are conducted and surface expansion ratio and interface pressure on the boundary are calculated. The influence of process conditions, extrusion velocity and surface expansion ratio and boundary pressure, on the bonding are investigated.

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Aggarwal, A., et G. De Souza. « Effect of MDP/VBATDT ratio on zirconia-substrate bonding ». Dental Materials 29 (janvier 2013) : e1. http://dx.doi.org/10.1016/j.dental.2013.08.002.

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Lai, Andre, Nicolas Altemose, Jonathan A. White et Aaron M. Streets. « On-ratio PDMS bonding for multilayer microfluidic device fabrication ». Journal of Micromechanics and Microengineering 29, n^o 10 (7 août 2019) : 107001. http://dx.doi.org/10.1088/1361-6439/ab341e.

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Moers, Cassandra, et Christian Dresbach. « Influence of R-Ratio on Fatigue of Aluminum Bonding Wires ». Metals 13, n^o 1 (20 décembre 2022) : 9. http://dx.doi.org/10.3390/met13010009.

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Bonding wires made of aluminum are the most used materials for the transmission of electrical signals in power electronic devices. During operation, different cyclic mechanical and thermal stresses can lead to fatigue loads and a failure of the bonding wires. A prediction or prevention of the wire failure is not yet possible by design for all cases. The following work presents meaningful fatigue tests in small wire dimensions and investigates the influence of the R-ratio on the lifetime of two different aluminum wires with a diameter of 300 µm each. The experiments show very reproducible fatigue results with ductile failure behavior. The endurable stress amplitude decreases linearly with an increasing stress ratio, which can be displayed by a Smith diagram, even though the applied maximum stresses exceed the initial yield stresses determined by tensile tests. A scaling of the fatigue results by the tensile strength indicates that the fatigue level is significantly influenced by the strength of the material. Due to the very consistent findings, the development of a generalized fatigue model for predicting the lifetime of bonding wires with an arbitrary loading situation seems to be possible and will be further investigated.

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Yan, Lintong, Yunong Ye, Zhe Ji, Yijia Liu, Chenglong Zhou et Song Liu. « The Stress Induced by the Epoxy Bonding Layer Changing in the Layered Hollow Spheres ». Science of Advanced Materials 14, n^o 4 (1 avril 2022) : 736–42. http://dx.doi.org/10.1166/sam.2022.4287.

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In order to solve the problem of the instability of the layered hollow spherical structure caused by the epoxy bonding layer cracking, peeling and destruction, an exact analytical solution of the multi-layered hollow sphere with epoxy bonding layer under point load is obtained. The influence of the epoxy bonding layer change on the stress of the layered hollow sphere is studied by using the methods of analytical solution and numerical calculation. Numerical calculation results show that the stress of the bonded layered structure is affected by the Young’s modulus, Poisson’s ratio and the thickness of the bonding material without changing the overall size of the bonded layered hollow spheres. The use of the bonding materials can cause stress concentration at the bonding material interface. And the increase of Young’s modulus and the thinning of thickness of the bonding material can reduce the stress at the interface between the epoxy bonding layer and the outer layer. Moreover, the change of Poisson’s ratio of the bonding material cannot substantially reduce the interface stress. The research results provide theoretical guidance for the material selection and thickness setting of the bonding layer for layered hollow sphere.

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Xu, Wei, Chengdong Xia et Chengyuan Ni. « Numerical Simulation and Experimental Verification of Hot Roll Bonding of 7000 Series Aluminum Alloy Laminated Materials ». Metals 14, n^o 5 (7 mai 2024) : 551. http://dx.doi.org/10.3390/met14050551.

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In the present study, the hot roll bonding process of 7000 series aluminum alloy laminated materials was numerically simulated and investigated using the finite element method, and the process parameters were experimentally verified by properties testing and microstructure analysis after hot roll bonding. In the roll bonding process of aluminum alloy laminated materials, the effects of the intermediate layer, pass reduction ratio, rolling speed and thickness ratio of component layers were studied. The results of finite element simulations showed that the addition of a 701 intermediate layer in the hot roll bonding process could effectively coordinate the deformation of the 705 layer and 706 layer and prevented the warping of the laminated material during hot rolling. It is recommended to use a multi-pass rolling process with small deformation and high speed, and the recommended rolling reduction ratio is 20%~30%, the hot rolling speed is 1.5~2.5 m/s and the thickness ratio of the 705 layer and 706 layer is about 1:5. Based on the above numerical results, five-layer and seven-layer 7000 series aluminum alloy laminated materials were prepared by the hot roll bonding process. The results showed that metallurgical bonding was realized between each component layer, and no delamination was observed from the tensile fracture between the interfaces of component layers. The tensile strength of the prepared laminated materials decreased with the increase in the thickness ratio of the 705 layer, and the bonding strengths of the laminated materials were in the range of 88–99 MPa. The experimental results verified the rationality of the process parameters recommended by the numerical simulations in terms of warping and delamination prevention.

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Jiang, Qingwei, Xiaohong Li, Peng Yang, Sheng Zhang et Min Li. « Effect of first pass rolling reduction ratio on the microstructure and mechanical properties of TA1/Q235B clad plates ». International Journal of Modern Physics B 35, n^o 12 (10 mai 2021) : 2150144. http://dx.doi.org/10.1142/s0217979221501447.

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In this study, the microstructure, the shear strength and Vickers-hardness of TA1/Q235B clad plates under different first pass rolling reduction ratio (FP3R) were investigated. The microstructure and bonding interface were analyzed by optical microscopy (OM), scanning electron microscopy (SEM). The Vickers-hardness and tensile shear strength were also detected. The result indicated a good bonding along the interface of the bonded with flat and smooth under different reduction ratio. The shear strength of the TA1/Q235B clad plate increases with the increase of reduction ratio which was 189 MPa at maximum. The maximum Vickers-hardness was approximately 198.7 HV. The thickness of Ti and Fe diffusion layer increases from 2.6 to 3.65 [Formula: see text]m and 2.1 to 3.3 [Formula: see text]m, respectively. TiC and Fe-Ti intermetallic compounds were formed at the bonding interface due to diffusion of Fe, Ti and C, causing micro-indentation at the interface to initiate cracking and diffusion, and reduced the bonding quality.

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Fang, Zhonghang, Changgen Shi, Hesheng Shi et Zerui Sun. « Influence of Explosive Ratio on Morphological and Structural Properties of Ti/Al Clads ». Metals 9, n^o 2 (24 janvier 2019) : 119. http://dx.doi.org/10.3390/met9020119.

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The current work focuses on the effect of explosive ratio R on the comprehensive properties of Ti/Al clads manufactured via explosive welding. The lower and upper limits of explosive ratio, namely R1 and R2, were determined according to the R–δf (flyer plate thickness) welding window. Two TA2/1060 explosive cladding plates were successfully manufactured at the different explosive ratios. Microstructure investigation was conducted by optical microscopy (OM), scanning electron microscopy (SEM), and energy dispersive spectrometer (EDS). The small wave bonding interface was observed at R1, where the vortex structure containing the ingot structure appeared periodically. The bonding interface presented a big wave bonding morphology and a locally continuous melting layer at R2. Many prolonged grains and adiabatic shear bands (ASBs) were found near the interface for a greater explosive load. Intermetallic compounds were formed in the bonding zones of the two plates. The thickness of element diffusion area increased with an increasing explosive ratio. Comparative tests of mechanical properties indicated that the tensile shear strength at R1 was higher. The microhardness, tensile strength, and bending performance of the two plates are similar and acceptable. Tensile fracture analysis indicated the fracture mode at R1 was ductile fracture, while the explosive cladding plate at R2 had mainly ductile fracture with quasi-cleavage fracture as the supplement.

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Gao, Zhen Zhong, Chao Yue, Hai Bo Cao, Xiao Bo Wang, Xiao Feng Zhu et Rui Hang Lin. « Preparation and Formaldehyde Emission and Bonding Performance of Novel Modified Urea-Formaldehyde Resin Adhesive ». Advanced Materials Research 490-495 (mars 2012) : 3476–80. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.3476.

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Low formaldehyde emission and high bonding strength were two basic criterions of a good urea-formaldehyde resin adhesive (UFRA). In our study, melamine modified methylolurea solution (MUS), was synthesized and used as modifier for UFRA. The bonding strength and formaldehyde emission of urea-formaldehyde resin adhesives(UFRA) were influenced by some factors such as F/U molar ratio of the main resin, F/U molar ratio of modifier, melamine content, mixing ratio of main resin with modifier, which were investigated by a series of single-factor experiments. The results showed that the best adhesive bonding strength of UFRA was 0.93MPa and the lowest formaldehyde emission was 0.43mg / L, when F/U molar ratio of the main resin was 1.5, F/U molar ratio of the MUS was 0.5, the mass fraction of melamine addition level was 5wt.% of MUS, and the mixing mass ratio of methylolurea solution (MUS) to the main UF resin was 20:80.

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Ahmad, Salman, Mansoor Ahmad, Haseeb Ullah et Wahab ali. « Effect of high temperature and reduction ratio on the bonding strength of composite plates of Q235/SUS304 ». International Journal of Research Publication and Reviews 5, n^o 5 (2 mai 2024) : 2212–24. http://dx.doi.org/10.55248/gengpi.5.0524.1140.

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Mao, Jing, Wei Chen, Long Zhao, Lu Xia Yang et Bin Zhen Zhang. « Optimization of Microfluidic Chip Bonding Technology Based on Polydimethylsiloxane ». Key Engineering Materials 645-646 (mai 2015) : 741–45. http://dx.doi.org/10.4028/www.scientific.net/kem.645-646.741.

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This paper introduce a new polydimethylsiloxan (PDMS) microfluidic chip bonding technology. By studying the influence of prepolymer with different curing agents, curing temperatures and curing time to the PDMS-PDMS chip bonding strength,we get the optimal bonding parameters. The experiment results show that when the cover plate of PDMS with ratio 15:1 bond with the substrate whose ratio is 10:1,the largest strength can be reached. The research which was applied to the packing of microfluidic analysis chip has achieved good results.

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Mei, Fanghua, J. Jiang et W. J. Meng. « Eutectic bonding of Al-based high aspect ratio microscale structures ». Microsystem Technologies 13, n^o 7 (16 janvier 2007) : 723–30. http://dx.doi.org/10.1007/s00542-006-0352-3.

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Tani, Hiroshi, Yuki Uesaraie, Reguo Lu, Shinji Koganezawa et Norio Tagawa. « Hybrid lubricant film with high bonding ratio and high coverage ». Microsystem Technologies 26, n^o 11 (9 mars 2020) : 3331–37. http://dx.doi.org/10.1007/s00542-020-04806-9.

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Kim, Kang Hyun, Hyeonil Park, Dong Jun Lee, Yong Nam Kwon, Namhyun Kang et Jong-Hwa Hong. « One-Step Hybrid Bending/Diffusion Bonding Process and Analysis of the Bonding Characteristics of Titanium Alloy Sheets ». Materials 16, n^o 13 (21 juin 2023) : 4516. http://dx.doi.org/10.3390/ma16134516.

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A one-step hybrid bending/diffusion bonding process (HB/DBP) was developed for application to Ti-6Al-4V sheets to effectively improve buy-to-fly (BTF) ratio of aircraft parts, integrating sequential diffusion bonding followed by a bending process. The resulting bonding characteristics of these titanium alloy sheets were analyzed. Microstructural analysis and mechanical lap shear tests were performed to estimate the bonding quality. Additionally, bonding ratio, thickness strain, and shear strength were evaluated in relation to pressure under increasing temperature. When the applied pressure was lower than 0.5 MPa, early failure occurred at the joint of the specimens. However, when high pressure was applied, early failure occurred near the joint. To discuss the phenomenon, time-dependent viscoplastic material properties were characterized, and a numerical simulation analysis was performed. Viscoplastic deformation was observed around the bending area, which caused weakness around the bond under high-pressure conditions. A prototype of a Y-shaped heat shield was manufactured and the buy-to-fly ratio was effectively improved using the newly developed process. This study demonstrates the potential of applying the developed process for producing aircraft parts and the importance of viscoplastic behavior for the analysis of final product reliability.

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Tian, Wenchao, Hao Cui et Wenbo Yu. « Analysis and Experimental Test of Electrical Characteristics on Bonding Wire ». Electronics 8, n^o 3 (26 mars 2019) : 365. http://dx.doi.org/10.3390/electronics8030365.

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In this paper, electrical characteristic analysis and corresponding experimental tests on gold bonding wire are presented. Firstly, according to EIA (Electronic Industries Association)/JEDEC97 standards, this paper establishes the electromagnetic structure model of gold bonding wire. The parameters, including flat length ratio, diameter, span and bonding height, were analyzed. In addition, the influence of three kinds of loops of bonding wire is discussed in relation to the S parameters. An equivalent circuit model of bonding wire is proposed. The effect of bonding wire on signal transmission was analyzed by eye diagram as well. Secondly, gold bonding wire design and measurement experiments were implemented based on radio frequency (RF) circuit theory analysis and test methods. Meanwhile, the original measurement data was compared with the simulation model data and the error was analyzed. At last, the data of five frequency points were processed to eliminate the fixture error as much as possible based on port embedding theory. The measurement results using port extension method were compared with the original measurement data and electromagnetic field simulation data, which proved the correctness of the simulation results and design rules.

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RUSOP, M., T. SOGA et T. JIMBO. « THE BONDING PROPERTIES OF AMORPHOUS CARBON NITRIDE FILMS BY THE MEANS OF X-RAY PHOTOELECTRON SPECTROSCOPY STUDIES ». International Journal of Modern Physics B 19, n^o 11 (30 avril 2005) : 1925–42. http://dx.doi.org/10.1142/s0217979205029547.

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Amorphous carbon nitride films (a -CN x) were deposited by pulsed laser deposition of camphoric carbon target at different substrate temperatures (ST). The influence of ST on the bonding properties of a -CN x films was investigated. The nitrogen to carbon (N/C) atomic ratio and oxygen to carbon (O/C) atomic ratio, bonding state and microstructure of the deposited a -CN x films were characterized by X-ray photoelectron spectroscopy and confirmed by other standard measurement techniques. The bonding states between the C and N, and C and O in the deposited films are found significantly influenced by the ST during deposition process. The N/C and O/C atomic ratio of the a -CN x films reached the maximum value at 400°C. The ST of 400°C was proposed to promote the desired sp3-hybridized C and the C 3 N 4 phase. The C–N bonding of C–N, C=N and C–N were observed in the deposited a -CN x films.

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Wang, Hui, Zhigang Duan, Feng Wang, Hongyan Wang et Guanben Du. « Effects of dielectric barrier discharge plasma treatments on the performance of poplar plywood produced with UF resins of different molar ratios ». BioResources 14, n^o 1 (21 décembre 2018) : 1279–88. http://dx.doi.org/10.15376/biores.14.1.1279-1288.

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Poplar veneers were treated with dielectric barrier discharge (DBD) plasma at atmospheric pressure, and the effects on the veneer surface feature were explored. The bonding strength of poplar plywood glued with different urea-formaldehyde resins of varying molar ratios was also investigated. The wettability and resin penetration of the veneer treated with DBD plasma were dramatically improved, especially for the UF resin with a higher formaldehyde to urea (F/U) molar ratio. The apparent contact angle of the veneer-treated plywood decreased and the resin penetration content increased as well. The bonding strength of the plywood increased in different degrees, and the wet bonding strength in particular sharply increased; when the F/U molar ratio was 1.3, the strength was improved by 138.2%. However, when the F/U molar ratio increased, the wet bonding strength improvement declined. The veneer surface image before and after the DBD treatment was invested via scanning electron microscopy, the surface was rougher and looser, which was beneficial for resin penetration. These all indicated that the balance between the characteristics of the resin and the penetration of the veneer surface is critical for an improvement in the bonding strength of plywood.

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Münster, Dennis, Michele Vidoni et Gerhard Hirt. « Effects of Process Parameter Variation on the Bonding Strength in Clad Steel Strips by Twin-Roll Strip Casting ». Materials Science Forum 854 (mai 2016) : 124–30. http://dx.doi.org/10.4028/www.scientific.net/msf.854.124.

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Twin-roll strip casting represents a promising alternative production route for clad steel strips. The main idea behind the presented research is the introduction of a prefabricated strip into the melt pool of a twin-roll casting process to exploit the heat of the melt to create bonding between the cast strip and the prefabricated strip. Prior investigations proved the general feasibility of this concept for steel-steel combinations and described the bonding of the two layers. This concept is now further investigated with the aim to understand the influence of the process parameters on the bonding. For the experiments an austenitic high manganese steel is cladded with an austenitic stainless steel. Beginning from a starting point determined in numerical simulations, a process window for the introduction of a 0.3 mm thick strip of 1.4301 was identified by process parameter variation during casting experiments. Up to 25 m long clad strips with a thickness ratio between introduced strip and cast strip ranging from 1:6 to 1:10 were produced this way. Micrographic examinations of the clad strips’ cross sections were carried out to describe the influence of the casting parameters on the joining interface. Higher element diffusion was found in strips with bigger thickness ratios, indicating a stronger bonding of the two layers. Afterwards the observations from the micrographic examination were compared to the results of bonding strength which were obtained by a customised shear test. Supporting the findings of the micrographic examinations the average bonding strength rose from around 100 MPa for a ratio of 1:7 to over 300 MPa for the ratio of 1:10. Although the process parameters with the main influence on the bonding strength, the contact time and the thickness ratio, have been identified more research is needed to quantify their influence.

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Jung, Taek Kyun, Hyouk Chon Kwon, Sung Chul Lim, Young Sup Lee et Mok Soon Kim. « Effects of Core Material on Extrudability of Cu/Pure Al, Cu/Al3003 Clad Composites by Indirect Extrusion ». Materials Science Forum 475-479 (janvier 2005) : 967–70. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.967.

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We investigated about the effects of core material(Pure Al, Al3003) on extrudability such as the maximum extrusion ratio and the bonding strength of Copper Clad Aluminum(CCA) by indirect extrusion. As a results of this experiment, the maximum extrusion ratio of Cu/Al3003 was 38, which was larger than 21.39 of Cu/Al(Cu/pure Al). It was because that the difference of flow stress between copper as the sheath material and Al3003 as the core material was smaller than that of between copper and pure aluminum under the same extrusion temperature of 623K. The bonding strength gradually increased when the extrusion ratio increased, on the other hand, the bonding strength of Cu/Al3003 was higher than that of Cu/Al under same extrusion conditions. The diffusion layer thickness that affected bonding strength was not affected by the kind of core material, but it gradually increased when the extrusion ratio increased. It was thought that Cu/Al3003 had a more intimate diffusion layer than Cu/Al had because the extrusion pressure of Cu/Al3003 was higher than that of Cu/Al under the same extrusion conditions.

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Reichelt, Stephan, Haitham Saleh, Matthias Schmidtchen et Rudolf Kawalla. « On the Bonding Strength of Mg-Mg and Mg-Al Material Compounds ». Materials Science Forum 783-786 (mai 2014) : 455–60. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.455.

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The dependence of different brushing parameters during surface preparation on the resulting bonding strength for the roll-bonding of Mg-Mg composites was investigated. A parameter study with different brushing parameters was used to analyze the effect on surface roughness as pre-step for roll-bonding trials with different roughness ratio. Furthermore, the influence of different Mg alloys and of a roll-bonded Al-Mg-Al sandwich composite on the obtained bonding strength was investigated.

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Pan, Hongbing, Wei Zhang, Anqi Xiao, Xiaolin Lyu, Pingping Hou, Zhihao Shen et Xinghe Fan. « Hierarchically ordered nanostructures of a supramolecular rod-coil block copolymer with a hydrogen-bonded discotic mesogen ». Polymer Chemistry 10, n^o 8 (2019) : 991–99. http://dx.doi.org/10.1039/c8py01726c.

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Supramolecular liquid crystalline block copolymers prepared via hydrogen bonding exhibit hierarchical structures that can be tuned by varying the molar ratio of the discotic hydrogen-bonding acceptor to the block copolymer donor.

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Jemal, D. E., L. Zsolt et S. Máté. « Numerical Investigation of Hot Roll Bonding of Multilayer Sheet Metal ». IOP Conference Series : Materials Science and Engineering 1246, n^o 1 (1 août 2022) : 012012. http://dx.doi.org/10.1088/1757-899x/1246/1/012012.

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Abstract The roll bonding process of the sandwich sheet is a preferable production method to manufacture multilayer sheets and it needs clear investigation because some industrial parts cannot fulfill all of the requirements by single-layer material. In this study, a theoretical model of roll bonding has been reviewed and hot sandwich rolling processes with different plate thickness and flow stress were numerically investigated. The contact pressure-dependent bonding properties in the deformation zone were defined. Then, the liner thickness and reduction ratio are important parameters to determine the total deformation zone. When the thickness of the liner becomes large, unbonded length of deformation can be a serious problem and at the same time, the good bonding strength can be found at a higher reduction ratio of the thinner liner.

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Roh, J. W., J. S. Yang, S. H. Ok, Deok Ha Woo, Young Tae Byun, Young Min Jhon, Tetsuya Mizumoto, Woo Young Lee et Seok Lee. « Low Temperature O₂ Plasma-Assisted Wafer Bonding of InP and a Garnet Crystal for an Optical Waveguide Isolator ». Solid State Phenomena 124-126 (juin 2007) : 475–78. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.475.

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A novel process of wafer bonding between InP and a garnet crystal (Gd3Ga5O12, CeY2Fe5O12) based on O2 plasma surface-activation and low temperature heat treatment is presented. The O2 plasma assisted wafer bonding process was found to be very effective in bonding of InP and Gd3Ga5O12, providing good bonding strength and hydrophilicity as well as no voids in the interface, which is crucial for fabrication of an integrated optical waveguide isolator. The isolation ratio of an integrated optical waveguide isolator fabricated by the O2 plasma assisted wafer bonding process was obtained to be 2.9 dB.

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Liu, Wei-Jia, You-Bo Wang, Qing-Bin Li, Xiao-Feng Gao, Yao-Shen Tan, Chun-Feng Liu, Yu Hu et Xu-Jing Niu. « Research on Interlayer Bonding Quality Control Method of Dam Concrete Based on Equivalent Age ». Materials 14, n^o 18 (9 septembre 2021) : 5192. http://dx.doi.org/10.3390/ma14185192.

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Interlayer bonding quality is the key to the stability and durability of dam concrete. In this study, interlayer splitting tensile strength, relative permeability coefficient, and electric flux of dam concrete at different temperatures were tested. The relationships between equivalent age and strength coefficient, relative permeability coefficient ratio, and electric flux ratio were established. Meanwhile, a comprehensive early-warning and control system of dam interlayer bonding quality based on the above relationships was proposed. The results showed that the interlayer mechanical properties, impermeability, and anti-chloride ion permeability of dam concrete decreased with the increase of temperature. Moreover, the equivalent age was linearly correlated with strength coefficient, relative permeability coefficient ratio, and electric flux ratio of concrete. The correlation coefficients were 0.986, 0.973, and 0.924, respectively. In addition, the interlayer bonding quality of dam concrete can be effectively controlled by the early-warning system established according to the relationship between equivalent age and interlayer properties parameters.

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He, Qian, Tianyi Zhan, Haiyang Zhang, Zehui Ju, Lu Hong, Nicolas Brosse et Xiaoning Lu. « Comparison of Bonding Performance Between Plywood and Laminated Veneer Lumber Induced by High Voltage Electrostatic Field. » MATEC Web of Conferences 275 (2019) : 01013. http://dx.doi.org/10.1051/matecconf/201927501013.

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High voltage electrostatic field (HVEF) was applied in order to improve wood surface characteristics, bonding and mechanical properties of wood composites. Masson pine (Pinus massoniana Lamp.) plywood and laminated veneer lumber (LVL) were selected in this study. Surface characteristics were conducted by the electron spin resonance (ESR) and X-ray photoelectron spectra (XPS). Bonding interphase and mechanical properties were investigated by fluorescence microscopy and vertical density profile (VDP), bonding strength, wood failure ratio, MOE and MOR. The results indicated that more increments were obtained in free radicals, O/C ratios and C2-C4 components. This is because electrons broke more wood chemical groups and new ions occurred among wood surface under HVEF. Significantly decreased PF adhesive penetration depth (PD) and increased density at bonding interphase was achieved in HVEF treated composites. More decrease of PD and increment of density were observed in plywood than that of LVL. This was attributed to cross linked wood fibers among bonding interphase in plywood. Mechanical properties of bonding strength, wood failure ratio, MOE and MOR were significantly increased under HVEF treatment both for two composites. Higher bonding strength, MOE and MOR were obtained in plywood and their increments were as 98.53%, 33.33%, 18.55% and 12.72%.

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Cheng, Fang Chao, et Ying Cheng Hu. « Stiffness of Wood-FRP Bonding Interface with Ambient Curable Epoxy Adhesives ». Applied Mechanics and Materials 26-28 (juin 2010) : 944–47. http://dx.doi.org/10.4028/www.scientific.net/amm.26-28.944.

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Effects of glue spread, adhesive kind and curing agent ratio and FRP (Fiber Reinforced Plastic) on stiffness of wood-FRP bonding interface were investigated. Two different kinds of epoxy resin and one kind of curing agent were used to bond wood-wood and wood-FRP samples with three different glue spread. Shear modulus of samples were measured by compression shear test to represent the stiffness of bonding interface. The results indicated that curing agent ratio and glue spread had significant effect on stiffness of wood-wood and wood-FRP bonding interfaces. In addition, the stiffness of wood-FRP interface was less than that of wood-wood interface.

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Gietzelt, Thomas, Volker Toth, Manfred Kraut, Uta Gerhards et Robin Dürrschnabel. « Comprehensive Study of the Deformation Behavior during Diffusion Bonding of 1.4301 (AISI 304) as a Function of Material Width and Aspect Ratio ». Metals 10, n^o 9 (19 août 2020) : 1116. http://dx.doi.org/10.3390/met10091116.

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In this paper, the impact of material width as well as aspect ratio on deformation during diffusion bonding of layered samples were investigated. For this, six annular samples with a constant cross-sectional area but an increasing diameter and thus decreasing material width were designed. In a first set of experiments, specimens of a constant height of h = 20 mm were examined. Each sample consisted of 10 sheets, 2 mm in thickness each. Diffusion bonding was performed at T = 1075 °C, t = 4 h and p = 15 MPa. Subsequently, additional samples with a constant aspect ratio of about three but different material width were diffusion bonded. For this, additional layers were added. It was expected that the deformation should be nearly constant for a constant aspect ratio. However, comparing the deformation to a sample possessing an aspect ratio of about three from the first batch, a much higher deformation was obtained now. Bonding a third sample, a deformation in the same range as for the other two samples of the second batch was obtained. It was found that due to the evaporation of metals, the thermocouples were subjected to aging, which was proven indirectly by the evaluation of heating power. Since the diffusion coefficient of the metals follows an exponential law, deformation changes considerably with temperature. This emphasizes that exact temperature measurement is very important, especially for bonding microprocessor devices at constant contact pressure. The experiments showed that the deformation depends strongly on geometry. Bonding parameters cannot be generalized. For layered setups, the contribution that thickness tolerances from manufacturing and leveling of surface roughnesses of sheets add to the overall deformation cannot be reliably separated. After diffusion bonding, thickness tolerances increase with a lateral dimension. Obviously, the stiffness of the pressure dies is crucial.

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Dong, Yao Hui, Qiang Gao, Yue Zhang et Jian Zhang Li. « Study on Curing Behavior of Low Molar Ratio Urea-Formaldehyde Resins with Different Curing Agents ». Advanced Materials Research 150-151 (octobre 2010) : 965–68. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.965.

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In order to characterize the curing behavior of low molar ratio urea-formaldehyde (UF) resin, the curing time and thermal analysis in curing reaction of the UF resins and the bonding strength and formaldehyde emission of plywood bonded by five kinds of low molar ratio UF resins with six different curing agents were studied. The results indicated that the UF resins with the molar ratio of formaldehyde to urea more than 1.0 could get reasonable curing time. The heat enthalpy of UF resins significantly increased with the enhancing the acidity of curing agent. The plywood manufactured by the UF resins with 1.1 molar ratio showed much higher bonding strength and lower formaldehyde emission.

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Long, Fang Yi, Sheng Li Wu, Juan Zhu, Yuan Du et Guo Liang Zhang. « Experimental Research on Bonding Intensity of Iron Ores in the Sintering Process ». Advanced Materials Research 391-392 (décembre 2011) : 60–64. http://dx.doi.org/10.4028/www.scientific.net/amr.391-392.60.

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The bonding intensity of four kinds of ores from Brazil, Australia and South Africa is researched in this study, and the influence factors are analyzed. The results show that, the ores of different types have apparently differences in bonding intensity, ores from Brazil and South Africa have high bonding intensity, while ores from Australia have low bonding intensity; The foundation of generation of effective liquid is adequate liquid phase fluidity and the lower porosity of core ore; The ratio of porosity of core ore and the index of liquid phase fluidity has negative correlation with the bonding intensity.

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Chen, Zong Ping, Ying Liang et Yu Liang Chen. « Research on Bonding Strength of Steel and Concrete with Different Bonding Interfaces ». Applied Mechanics and Materials 470 (décembre 2013) : 838–41. http://dx.doi.org/10.4028/www.scientific.net/amm.470.838.

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For the purpose of researching the natural bonding behavior of different interfaces between steel and concrete in SRC structures, four specimens are designed to launch the monotonic push-out loading test. Each specimen is used to consider one case, including the bonding of the external flange, internal flange, web and whole cross-sections with the concrete. Failure process and modes of these specimens were observed during the test. Load-slip curves and ultimate bond strength are obtained and the bonding strength between different interfaces of steel and concrete was analyzed. The results show that the bonding strengths of different interfaces in SRC members are not equal. The minimum bonding strength occurs in web, the bonding strength of external flange is higher, and the maximum bonding strength occurs in internal flange, the ratio of the strength is 1:1.39:1.59.

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Berns, Belinda, et Bernd Tieke. « Electrochromic polyiminocarbazolylenes with latent hydrogen bonding ». Polymer Chemistry 6, n^o 27 (2015) : 4887–901. http://dx.doi.org/10.1039/c5py00713e.

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Electrochromic polyiminoarylenes with carbazole units in main and side chain and thermally cleavable t-butyloxycarbonyl (boc) substituents are described. After removal of the boc groups insoluble, well adhering polymers with high contrast ratio and short switching time are obtained.

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Song, Min, Zhiyong Wang, Jie Zhang et Zhihua Wang. « Influence of Bonding Area on Dynamic Failure Behavior of Notched Reinforced Concrete Beams ». Materials 16, n^o 2 (4 janvier 2023) : 507. http://dx.doi.org/10.3390/ma16020507.

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To study the effect of the bonding area on the dynamic failure process of a reinforced concrete beam with the same reinforcement ratio, the experimental and numerical researches on the impact response of notched reinforced concrete beams in the low-velocity regime (≤2.5 m/s) are presented. The tests are carried out with a drop hammer impact testing machine and then the structural responses under different impact velocities are analyzed. Additionally, the dynamic three-point bending simulation for specimens with different bonding areas, but the same reinforcement ratio is conducted. In this numerical model, the parameters of a cohesive model verified from a steel bar pullout test are applied to the bonding layer to simulate the bond-slip behavior of steel bars. Then, the energy dissipation for each component (e.g., concrete, a steel bar, and the bonding layer) are compared and discussed. The dynamic experimental results suggest that the energy absorbed during the impact process increases with the growth of the impact velocity, while the effect of the impact velocity on the reaction force can be ignored. The numerical results indicate that the failure pattern changes from a bending failure to shear failure with the increase in the bonding area and impact velocity. With the growth of the bonding area, the steel bars reach the plastic stage easily and the internal energy dissipation of the bonding layer decreases, which protects the bonding effect between the steel bar and concrete effectively.

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Cheng, Fang Chao, et Ying Cheng Hu. « Bonding Quality of Wood-FRP Interface with Ambient Curable Epoxy Adhesives ». Advanced Materials Research 129-131 (août 2010) : 572–75. http://dx.doi.org/10.4028/www.scientific.net/amr.129-131.572.

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Effects of glue spread, adhesive kind and curing agent ratio on bonding quality of wood-FRP (Fiber Reinforced Plastic) interface were investigated to choose the optimal adhesive and condition of bonding wood-FRP composites. Two different kinds of epoxy resin and one kind of curing agent were used to bond wood-wood and wood-FRP samples with three different glue spread. Shear strength of samples were measured by compression shear test. The results indicated that bonding strength of wood-FRP sample with glue spread of 300 g/mm2 and curing agent ratio of 40% were the best, when using the same epoxy resin and curing agent. The shear strengths of wood-FRP samples were less than those of samples without FRP. The bonding qualities of samples with E-44 epoxy resin/T-31 curing agent system were better than those of E-51 epoxy resin/T-31 curing agent system.

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Chitra, R., Amit Das, R. R. Choudhury, M. Ramanadham, S. Lakshmi, M. A. Sridhar et J. Shashidar Prasad. « Hydrogen bonding in thiourea : diethyl oxalate complex in 2:1 ratio ». Journal of Chemical Crystallography 35, n^o 7 (juillet 2005) : 509–12. http://dx.doi.org/10.1007/s10870-005-2853-9.

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D’Urso, L., G. Compagnini et O. Puglisi. « sp/sp2 bonding ratio in sp rich amorphous carbon thin films ». Carbon 44, n^o 10 (août 2006) : 2093–96. http://dx.doi.org/10.1016/j.carbon.2006.04.016.

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Kumar, S. Suresh, et Balasubramanian Ravisankar. « Evaluation of Quality Diffusion Bonding in Similar Material (Cu/Cu) Using Ultrasonic ‘C’ Scan Testing Method ». Applied Mechanics and Materials 592-594 (juillet 2014) : 289–93. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.289.

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In the present study, diffusion bonding of Cu/Cu was carried out at 750 °C for 60min under uniaxial pressureof 5-15MPa in vacuum. The joints were evaluated by Microtensile testing and Ultrasonic testing. The bond qualities were assessed by destructive testing (strength ratio) and nondestructive ultrasonic C–scan testing method.The bond quality obtained by both the methods is correlated in a view to use the C scan for regular testing. The optimum condition for obtaining the best bonding characteristics is reported. The joint obtained by diffusion bonding at 750 °C and a applied pressure of 15MPa for 60min gives the best bonding characteristics.Keywords: diffusion bonding/welding, Interface, Ultrasonic nondestructive testing.

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Papworth, A. J., C. J. Kiely, S. R. P. Silva et G. A. J. Amaratunga. « Electron Energy Loss Spectroscopy Characterisation of the Sp2 Bonding Fraction Within Carbon Thin Films. » Microscopy and Microanalysis 5, S2 (août 1999) : 632–33. http://dx.doi.org/10.1017/s1431927600016482.

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Electron energy loss spectroscopy is the only direct technique that can semi-quantitatively determine the nature of the bonding in carbon thin films. To quantify the sp2/sp3 bonding fraction, the spectrum taken from the film must be compared to that of a suitable known standard. The bonding fraction can be analysed by studying the K ionisation edge in the electron energy loss spectrum. A method for quantifying the sp2 bonding fraction in an amorphous carbon film has been described by Berger et al (1988), where the area of peak of the film is compared with that of graphite. The principle of quantifying the edge structure is to obtain a ratio of the two peak areas using the following formula, (1), where fπis the ratio between the two π* peaks, Iπ. is the integral of the transition, and ΔE is the integrated counts for the normalising energy window. The superscripts s and u denote the standard and unknown spectra respectively.

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Ching, Wai-Yim, Saro San, Caizhi Zhou et Ridwan Sakidja. « Ab Initio Simulation of Structure and Properties in Ni-Based Superalloys : Haynes282 and Inconel740 ». Materials 16, n^o 2 (16 janvier 2023) : 887. http://dx.doi.org/10.3390/ma16020887.

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The electronic structure, interatomic bonding, and mechanical properties of two supercell models of Ni-based superalloys are calculated using ab initio density functional theory methods. The alloys, Haynes282 and Inconel740, are face-centered cubic lattices with 864 atoms and eleven elements. These multi-component alloys have very complex electronic structure, bonding and partial-charge distributions depending on the composition and strength of the local bonding environment. We employ the novel concept of total bond order density (TBOD) and its partial components (PBOD) to ascertain the internal cohesion that controls the intricate balance between the propensity of metallic bonding between Ni, Cr and Co, and the strong bonds with C and Al. We find Inconel740 has slightly stronger mechanical properties than Haynes282. Both Inconel740 and Haynes282 show ductile natures based on Poisson’s ratio. Poisson’s ratio shows marginal correlation with the TBOD. Comparison with more conventional high entropy alloys with equal components are discussed.

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Zou, Gui Sheng, Yan Ju Wang, Ai Ping Wu, Hai Lin Bai, Nai Jun Hu, Xiu Hua Song et Han Ping Yi. « Efficient Diffusion Bonding between BSCCO Superconducting Multifilamentary Tapes ». Materials Science Forum 580-582 (juin 2008) : 295–98. http://dx.doi.org/10.4028/www.scientific.net/msf.580-582.295.

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To improve the joining efficiency of Bi-Sr-Ca-Cu-O ( BSCCO) superconducting tapes, a new diffusion bonding technology with a direct uniaxial pressing at high temperature was developed to join 61-filament tapes. It was observed that bonding parameters such as bonding pressure and holding time, significantly affected the critical current ratio (CCRo). A peak CCRo value of 89 % for the lap-joined tapes was achieved at 3 MPa for 2 h when bonding temperature was 800 °C. Compared with the conventional diffusion bonding technology, this new technology remarkably shortened the fabrication period and improved the superconductivity of the joints. The bonding interface and microstructures of the joints were evaluated and correlated to the CCRo. An uniaxial pressing at high temperature was beneficial to interface bonding, and there was an optimal pressure value for the CCRo.

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Liu, Lan, Lei He, Zhi Cheng, Xiaoyi Wang, Zhe Ma et Xinrong Cheng. « Interface Bonding Behavior of Concrete-Filled Steel Tube Blended with Circulating Fluidized Bed Bottom Ash ». Materials 14, n^o 6 (20 mars 2021) : 1529. http://dx.doi.org/10.3390/ma14061529.

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The interface bonding behavior between the steel tube and the concrete of concrete-filled steel tube (CFST) blended with circulating fluidized bed bottom ash (CFB-BA) was investigated in this study. A total of 8 groups of CFSTs stub columns were prepared with different dosage of CFB-BA, water-binder ratio (W/B), and interface bonding length. A series of push-out tests were carried out to acquire the data representing the interface bonding behavior. The results show that the dosage of CFB-BA has a direct effect on interface bonding behavior of CFST. CFB-BA can improve the interface bonding behavior of CFST. The highest ultimate bonding load and strength are achieved when the dosage of CFB-BA is 30%. When the dosage of CFB-BA increases to 50%, its interface bonding behavior decreases, but is still better than that of CFST without CFB-BA. W/B has a negative correlation with the interface bonding behavior of CFST. While the W/B increases, the interface bonding load and strength of CFST decreases. The increase of the interface bonding length can improve the interface bonding load, but cannot improve the interface bonding strength.

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LI, YONG, CHANG-JIU LI, GUAN-JUN YANG et CHENG-XING LI. « RELATION BETWEEN MICROSTRUCTURE AND THERMAL CONDUCTIVITY OF PLASMA-SPRAYED 8YSZ COATING ». International Journal of Modern Physics B 24, n^o 15n16 (30 juin 2010) : 3017–22. http://dx.doi.org/10.1142/s021797921006601x.

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Plasma-sprayed YSZ coatings have been widely employed as thermal insulation coatings in gas turbine for its low thermal conductivity. Thermal conductivity of ceramic coatings is closely related to coating microstructure. In the present study, YSZ coating was deposited on a stainless steel by atmospheric plasma spraying using a fuse-crushed 8wt.% Y 2 O 3-stablized ZrO 2 powder at different spray distances from 70 mm and 100 mm. The microstructure of YSZ coatings was quantitatively characterized through visualization of lamellar structure assisted by electroplating Ni and subsequent EDX line analysis. The thermal conductivity of YSZ coatings with different microstructures was tested by a laser flash technique. Results showed that the mean lamellar bonding ratio was 32% and almost kept unchanged for the coatings deposited at 70 mm and 85 mm and it was reduced by 25% when distance was increased to 100 mm. The thermal conductivity of the coatings largely depended on the mean bonding ratio between lamellae and increased with the bonding ratio.

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Jaskuła, Piotr. « Studies and analysis on interlayer bonding in asphalt pavements ». Budownictwo i Architektura 13, n^o 4 (9 décembre 2014) : 117–25. http://dx.doi.org/10.35784/bud-arch.1736.

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The paper describes research works of interlayer bonding of asphalt layers conducted at Gdansk University of Technology. The studies included laboratory and field tests, and calculation of pavement structures with different interlayer bonding models. Laboratory tests included interlayer bonding tests using the direct shear method which evaluated the influence of selected factors on interlayer bonding: the type and the amount of the emulsion, the method and the effectiveness of compaction, vulnerability to dirt, water and repeated shear loads. Field works were focused on the impact of interlayer bonding of asphalt layers on the deflection of pavement structure and the back-calculated stiffness modulus of asphalt mixtures. The analyses of the field tests also included the impact of the asphalt layers compaction ratio on interlayer bonding. Computational analyses of asphalt pavement structures consisted of the simulation of different interlayer bonding in a multi-layered elastic half-space. Calculations were also made by using the finite element method within cohesion and friction models to simulate interlayer bonding.

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Cui, Jian Zhong, et Xing Han. « Fabrication of Cladding Billet in Diameter of 160mm/148mm by Direct Chill Casting Process ». Materials Science Forum 877 (novembre 2016) : 3–8. http://dx.doi.org/10.4028/www.scientific.net/msf.877.3.

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The AA4045/AA3003 cladding billet, which has a low clad ratio of 7.5% in size of φ160mm/φ148mm, was prepared successfully by the modified direct chill casting process. Microstructures, elements distribution and mechanical properties of the bonding interface were examined. The results show that metallurgical bonding interface can be obtained with the optimal parameters. The metallurgical bonding interface is free of any discontinuities due to the elements diffusion across the interface. The hardness of the interfacial region is higher than that of the AA3003 but lower than that of AA4045, suggesting that the interface bonding strength is higher than the strength of AA3003. The shearing strength is 82.3 MPa, indicating excellent metallurgical bonding.

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KIM, TAE GYU, JEONG SEOK OH, HAN KI YOON et HYE SUNG KIM. « CHARACTERISTICS OF DLC FILMS INCORPORATED HMDS BY RF PECVD ». International Journal of Modern Physics B 24, n^o 15n16 (30 juin 2010) : 2999–3004. http://dx.doi.org/10.1142/s0217979210065982.

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Silicon incorporated diamond-like carbon films up to 6.2 at. % (DLC- Si ) were deposited onto a high speed steel samples by using a radio frequency plasma-enhanced chemical vapor deposition method. The influence of silicon doping on chemical composition, bonding structure, hardness, and adhesion of DLC films was investigated. Hexamethyldisilane ( HMDS ) gas was used as a silicon source with Ar carrier gas ranging from 0 to 15 sccm. Also, the mixtures of methane ( CH 4) and Ar gases were used as precursor gases. The addition of silicon into the DLC film was found to lead an increase of bonding ratio ( sp 3/ sp 2), hardness and critical adhesion

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Wang, You, Nan Deng, Zhenfeng Tong et Zhangjian Zhou. « The Effect of Fe/Al Ratio and Substrate Hardness on Microstructure and Deposition Behavior of Cold-Sprayed Fe/Al Coatings ». Materials 16, n^o 2 (16 janvier 2023) : 878. http://dx.doi.org/10.3390/ma16020878.

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Fe/Al composite coatings with compositions of Fe-25 wt.% Al, Fe-50 wt.% Al and Fe-75 wt.% Al were deposited on pure Al and P91 steel plates by a cold spray, respectively. The microstructure of the cross-section of the fabricated coatings was characterized by SEM and EDX. The bonding strength between the coatings and substrates was measured and analyzed. The effects of the Fe/Al ratios and substrate hardness on the deposition behavior were investigated. It was interesting to find fragmented zones in all fabricated coatings, which were composed of large integrated Al particles and small fragmented Al particles. Meanwhile, the fraction of fragmented zones varied with the fraction of the actual Fe/Al ratio. An Fe/Al ratio of 50/50 appeared to be an optimized ratio for the higher bonding strength of coatings. The in situ hammer effect caused by larger and harder Fe particles played an important role in the cold spray process. The substrate with the higher hardness strengthened the in situ hammer effect and further improved the bonding strength.

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Rahim, Jamilah Abd, Siti Hawa Hamzah et Mohd Saman Hamidah. « Bonding Strength of Expanded Polystyrene (EPS) Beads Enhanced with Steel Fiber in Reinforced Lightweight Concrete (LWC) ». Applied Mechanics and Materials 661 (octobre 2014) : 100–105. http://dx.doi.org/10.4028/www.scientific.net/amm.661.100.

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Lightweight concrete (LWC) is one of the favourable concrete to be used as it has low density with acceptable high strength, high durability, and toughness. In order to produce LWC, it is required special material such as expanded polystyrene (EPS) beads and steel fiber to be added into the design mix concrete. As known, EPS beads have zero strength. Meanwhile, the significant of steel fiber is to reduce micro and macro crack propagation. Therefore, pull out test were carried out to measure the bond strength between reinforcement bar and three series of concrete mix design which are normal concrete, EPS-LWC and EPS-LWC enhanced with steel fiber. Concrete adhesion and bearing deformation of reinforcing bar against the concrete are the two main mechanisms that influence the strength of bond in the steel reinforced concrete. Deformation will increase when the bonding stress increase. Normal concrete series shows the higher average bonding stress which is 531.22 kPa compared to others series concrete mix. Meanwhile, bonding stress of EPS-LWC mix is 174.54 kPa which is higher than EPS-LWC enhanced with steel fiber mix. Even though the present of the steel fibre can increase the strength of the LWC, but it effects to the bonding strength between reinforcement steel rod and concrete. There are two improtant factor in bonding determination which are volume fraction and aspect ratio of the steel fiber. Segregation will increase when the aspect ratio of steel fiber increased. Besides, the workability becomes low. This present study used types of hooked end steel fiber with 60 mm length and aspected ratio is 0.75. While the size of the cylindrical is 300 mm x 150 mm. The position of the steel fiber in the specimens is too compact and presenting the air voids. Consequently weaken the bonding strength between concrete and reinforcement bar.

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