The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Kintak Lau - One of the best experts on this subject based on the ideXlab platform.
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Interfacial Bonding characteristic of nanoclay polymer composites
Applied Surface Science, 2011Co-Authors: Mo Lin Chan, Kintak Lau, T T Wong, F CardonaAbstract:Using a small amount of nanoclay (montmorillonite (MMT)) can significantly enhance the thermal and mechanical properties of polymer-based composites. Therefore, an in depth understanding of the Bonding characteristic between the nanoclay and its surrounding matrix is essential. In this study, Fourier Transform Infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) were conducted to analyze the chemical composition between epoxy matrix and nanocomposite. These experiments revealed that a chemical Bonding at an interface between the matrix and nanoclay of the composites did exist. Thus, such Bonding can enhance the mechanical and thermal properties of resultant polymer composites as reported in many literatures.
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Interfacial Bonding characteristics of nanotube polymer composites
Chemical Physics Letters, 2003Co-Authors: Kintak LauAbstract:Abstract In this Letter, the stress transfer properties between single-/multi-walled nanotubes and polymer matrix are theoretically studied through the uses of local density approximation, elastic shells and conventional fibre pullout models. Several parameters such as the wall thickness, Young’s modulus, nanotubes’ volume fraction and chiral vectors of the nanotubes were considered in the study. According to the analytical results, it was found that the maximum shear stress, at the bond interface between the nanotubes and matrix, increases with increasing the nanotubes’ wall thickness of nanotube/polymer composites. Besides, the stress transfer length of zigzag nanotube is comparatively shorter than those of the armchair and chiral nanotubes.
Di Zhang - One of the best experts on this subject based on the ideXlab platform.
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enhanced load transfer by designing mechanical Interfacial Bonding in carbon nanotube reinforced aluminum composites
Carbon, 2019Co-Authors: Zhanqiu Tan, Genlian Fan, Dingbang Xiong, Qiang Guo, Di ZhangAbstract:Abstract The Interfacial native oxide layer always acts as barriers preventing effective Interfacial Bonding and load transfer in carbon nanotube reinforced aluminum (CNT/Al) composites. In this work, annealing-controlled reaction between the Interfacial native oxide layer and Mg element was attempted to improve Interfacial Bonding in CNT/Al Mg composite, and mechanical Interfacial Bonding featured with direct CNT-Al contact and well-reserved CNTs was achieved in the 1 h annealed composite. For the 2 h annealed composite, chemical Interfacial Bonding featured with Interfacial aluminum carbide (Al4C3) was established due to progressive Interfacial reaction. Further tensile tests and numerical analysis revealed that, owing to barrier-free load path and increased Interfacial friction stress, the mechanical Interfacial Bonding significantly enhanced CNT load transfer effect from 30.9 MPa to 59.4 MPa, which was close to shear-lag model prediction of 59.9 MPa. While, the chemical Interfacial Bonding led to a combined strengthening effect of 58.8 MPa from CNT-Al4C3 hybrid as a comprised outcome of Al4C3 strengthening and CNT damage. Thus, the design of mechanical Interfacial Bonding should be a superior strategy for improving Interfacial Bonding and enhancing mechanical performance in CNT/Al composites, considering its effective protection of CNT structure integrity and suppressed formation of hydrolysable Al4C3 phase.
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enhanced Interfacial Bonding and mechanical properties in cnt al composites fabricated by flake powder metallurgy
Carbon, 2018Co-Authors: Yue Jiang, Dingbang Xiong, Yishi Su, Li Hu, Zhiqiang Li, Di ZhangAbstract:Abstract A flake powder metallurgy route consists of a slurry based dispersion process and a short time ball milling process was proposed to fabricate strong and ductile CNT/Al composites reinforced with high content CNTs. To improve the Interfacial Bonding, the CNT/Al nanoflake powders prepared through slurry based dispersion process would go through a short time high energy ball milling process to break native Al2O3 skin and embed CNTs into Al matrix. With the dispersion homogeneity and well-maintained structural integrity of CNTs achieved by the slurry based dispersion, and improvement of Interfacial Bonding from non-Bonding to physical Bonding/diffusion assisted Bonding and partial reaction Bonding through the short time ball milling, an enhancement of tensile strength from 298 to 406 MPa and ductility from 1.9 to 8.8% was obtained for the 2 h ball-milled 3 vol.% CNT/Al composites, compared to the composites fabricated by sole slurry based dispersion process. It also outperformed that fabricated by direct high energy ball milling, indicating the flake powder metallurgy method could provide a good coordination between the CNT dispersion homogeneity, structural integrity and Interfacial Bonding.
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tailoring Interfacial Bonding states of highly thermal performance diamond al composites spark plasma sintering vs vacuum hot pressing
Composites Part A-applied Science and Manufacturing, 2016Co-Authors: Zhanqiu Tan, Ahmed Addad, Jeanfrancois Silvain, Di ZhangAbstract:Interfacial configurations of the diamond/Al composites fabricated by vacuum hot pressing (VHP) and spark plasma sintering (SPS) have been investigated to evaluate feasibility of both techniques for tailoring Interfacial Bonding states, namely non-bonded, diffusion-bonded, partially and fully reaction-bonded interfaces. Multiscale Interfacial characterization reveals that the unique diffusion-bonded interface at the micrometer scale, being very favorable for enhancing global thermal conductivity (TC), has been achieved by conventional VHP technique due to its large processing window and homogenous thermal field. Comparatively, micrometer-scale and, even macroscopic (radial and axial) thermal gradients can be inevitably generated during the SPS process in rapid heating-cooling mode. As a result, the mixed Interfacial Bonding states have always been introduced in the SPSed samples which reduce the effectiveness of TC enhancement. The formation mechanisms of nanoscale Interfacial Al2O3 and Al4C3 at the diamond/Al interface are also discussed.
Lanzhong Hao - One of the best experts on this subject based on the ideXlab platform.
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effect of chemisorption on the Interfacial Bonding characteristics of carbon nanotube polymer composites
Polymer, 2008Co-Authors: Qingbin Zheng, Qingzhong Xue, Keyou Yan, Xili Gao, Lanzhong HaoAbstract:Abstract The influence of chemical functionalization on the Interfacial Bonding characteristics of single-walled nanotubes (SWNTs) reinforced polymer composites was investigated using molecular mechanics and molecular dynamics simulations. The simulations show that functionalization of nanotubes at low densities of functionalized carbon atoms drastically increases their Interfacial Bonding and shear stress between the nanotubes and the polymer matrix, where chemisorption to as little as 5.0% of the nanotube carbon atoms increases the shear stress by about 1000%. This indicates that increasing the load transfer between SWNTs and a polymer matrix in a composite via chemisorption may be an effective way and chemical attachment of nanotubes during processing may be in part responsible for the enhanced stress transfer observed in some systems of the nanotube–polymer composites. Furthermore, this suggests the possibility to use functionalized nanotubes to effectively reinforce other kinds of polymer-based materials as well.
Shuo Yin - One of the best experts on this subject based on the ideXlab platform.
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new insights into the coating substrate Interfacial Bonding mechanism in cold spray
Scripta Materialia, 2016Co-Authors: Yingchun Xie, Shuo Yin, Chaoyue Chen, Marie-pierre Planche, Hanlin Liao, Rocco LupoiAbstract:Abstract A new theory was proposed to explain the Interfacial Bonding mechanism of hard Ni coating onto soft Al substrate. The experimental results indicate that the metal-to-metal contact and the consequent metallurgical Bonding at the coating/substrate interface were absent in the single particle depositing but could be achieved in the full coating deposition. Based on this, it is proposed that the particle peening effect breaks the cracked oxides that remained at the coating/substrate interface into nano-pieces and promotes further deformation of materials. Thus, the pores caused by the bridge-like oxides at the interface are filled and the discontinuous metal-to-metal contact is achieved.
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effect of substrate temperature on Interfacial Bonding for cold spray of ni onto cu
Journal of Materials Science, 2015Co-Authors: Xinkun Suo, Yingchun Xie, Shuo Yin, Rocco Lupoi, Hanlin LiaoAbstract:Cold spray as a relatively new surface modification technique has great potential in the industry due to its ‘low working temperature’. The Bonding quality between the cold-sprayed coating and the target substrate is one of the most important evaluation index for the coating performance. In this study, the Interfacial Bonding features between cold-sprayed Ni coatings and Cu are investigated to clarify the role of substrate temperature in the coating–substrate Bonding. The finite element analysis model which can simulate the heat conduction through the coating–substrate interface is developed to model the particle deposition process on the substrate. The surface morphology and cross section of the experimentally deposited particles are observed by scanning electron microscope. The substrate surface oxidization behavior and coating–substrate Interfacial atomic mixture are evaluated through the energy-dispersive spectroscopy line scans. The results indicate that heat conduction from the high-temperature substrate plays an important role in heating the Interfacial region. The increased Interfacial temperature significantly enhances the metallurgical Bonding by improving the coating–substrate atomic mixture at the interface. Besides, the high-temperature substrate is also found to result in prominent metal jet and strong mechanical interlock due to the enhanced thermal softening effect. As a consequence, coating mass and coating–substrate Bonding strength are promoted by using the high-temperature substrate.
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Interfacial Bonding features of Ni coating on Al substrate with different surface pretreatments in cold spray
Materials Letters, 2015Co-Authors: Shuo Yin, Xinkun Suo, Yingchun Xie, Xiaofang WangAbstract:The effect of the substrate surface pretreatment on the Ni-Al Interfacial Bonding features in cold spray was investigated. Oxide-free Interfacial area is found to be the essential factor that affects the Interfacial atomic diffusion and metallurgical Bonding. Voids are formed at the interface between the particle and grit-blasted substrates, significantly reducing the oxide-free Interfacial area. However, those voids cannot be found at the interface between the particle and polished and ground substrates. Therefore, the polished and ground substrates can provide higher coating mass and coating-substrate Bonding strength than the grit-blasted ones.
Seunghyun Baik - One of the best experts on this subject based on the ideXlab platform.
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the effects of Interfacial Bonding on mechanical properties of single walled carbon nanotube reinforced copper matrix nanocomposites
Nanotechnology, 2006Co-Authors: Untae Shim, Seyoung Oh, Byungho Sung, Jeehoon Choi, Seunghyun BaikAbstract:The effects of Interfacial Bonding on mechanical properties of single-walled carbon nanotube reinforced copper matrix nanocomposites were investigated. The nanocomposites were fabricated by means of a powder metallurgy process, which consists of mixing carbon nanotubes with matrix powder followed by hot-pressing. The mixing process was carried out by ultrasonicating the nanotubes and copper powder in ethanol. The Interfacial strength between the nanotubes and the copper matrix was improved by coating the nanotubes with nickel. The displacement rate of the nanotube reinforced nanocomposites was found to increase at 200 °C, whereas that of the nickel-coated nanotube reinforced nanocomposites significantly decreased. The incorporation of carbon nanotubes and nickel-coated carbon nanotubes in the copper matrix composites improved tribological properties compared with those of pure copper specimens.