Study on Laser Micro Shock Effect on Electrical Resistivity of Nanometer Copper Film

2014 ◽  
Vol 989-994 ◽  
pp. 45-48
Author(s):  
Qing Xue ◽  
Yin Qun Hua ◽  
Yu Chuan Bai ◽  
Rui Fang Chen ◽  
Hai Xia Liu
Keyword(s):  
Mechanical Properties ◽  
Electrical Resistivity ◽  
Elastic Modulus ◽  
Stress Concentration ◽  
Magnetron Sputtering ◽  
Twin Boundary ◽  
Copper Film ◽  
Electrical Performance ◽  
Shock Processing ◽  
Main Factor

The aim of this research is to improve the electrical performance of the nanometer copper film by laser micro shock processing. The nanometer copper film was prepared by the magnetron sputtering. The mechanism of laser micro shock processing effect on electrical resistivity, hardness and elastic modulus was investigated. The results show that the electrical resistivity of copper film after laser micro shock reduced by 22.5 % on average. And, the hardness and the elastic modulus increased by 38.5 % and 45.2 % on average, respectively. According to our research, we conclude that, the existence of a large number of twin, twin boundary, fault and the grow up grain are the main factor of the improvement of the electrical performance; and the existence of twin, stress concentration holes and fault are the key to improve its mechanical properties.

scholarly journals Magnetron Sputtering Construction of Nano-Al Metallized Wood and Its Functional Research

Forests ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1564
Author(s):  
Yanan Wang ◽  
Chengzhu Jin ◽  
Xinyi Wang ◽  
Qiushuang Li ◽  
Wenxuan Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Magnetron Sputtering ◽  
Sheet Resistance ◽  
Wood Surface ◽  
Functional Improvement ◽  
Material Structure ◽  
Wetting Properties ◽  
Al Metallization ◽  
Wood Surfaces

The magnetron sputtering method was used to deposit nano-Al film on the wood surface of Pinus sylvestris L. var. mongholica Litv., and the material structure, electrical conductivity, mechanical properties and wetting properties were tested and characterized. When the sputtering time was 60 min, the average cross-grain sheet resistance of metallized wood was 695.9 mΩ, and the average along-grain sheet resistance was 227.2 mΩ. Load displacement decreased by more than 88%,elastic modulus increased by 49.2 times, hardness increased by 46 times andsurface hydrophobic angle was close to 130°. The grain size of the Al film on the wood surface was presented as nanoparticles, and the arrangement was uniform and dense. The results indicate that without any burden on the environment, the use of magnetron sputtering can quickly and efficiently achieve Al metallization on wood surfaces, so that the wood surface can obtain conductivity and hydrophobic properties. The elastic modulus and hardness of the wood surface were improved, the mechanical properties of the wood were effectively improved and the functional improvement of the wood was realized. This study provides a feasible method and basis for the study of the simple, efficient and pollution-free modification of wood.

scholarly journals Stress Concentration Induced by the Crystal Orientation in the Transient-Liquid-Phase Bonded Joint of Single-Crystalline Ni3Al

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2765 ◽  
Author(s):  
Hongbo Qin ◽  
Tianfeng Kuang ◽  
Qi Li ◽  
Xiong Yue ◽  
Haitao Gao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Stress Concentration ◽  
Liquid Phase ◽  
Mechanical Strength ◽  
Crystal Orientation ◽  
Density Functional ◽  
Transient Liquid Phase ◽  
Single Crystalline ◽  
Bonded Joint

Single-crystalline Ni3Al-based superalloys have been widely used in aviation, aerospace, and military fields because of their excellent mechanical properties, especially at extremely high temperatures. Usually, single-crystalline Ni3Al-based superalloys are welded together by a Ni3Al-based polycrystalline alloy via transient liquid phase (TLP) bonding. In this study, the elastic constants of single-crystalline Ni3Al were calculated via density functional theory (DFT) and the elastic modulus, shear modulus, and Poisson’s ratio of the polycrystalline Ni3Al were evaluated by the Voigt–Reuss approximation method. The results are in good agreement with previously reported experimental values. Based on the calculated mechanical properties of single-crystalline and polycrystalline Ni3Al, three-dimensional finite element analysis (FEA) was used to characterize the mechanical behavior of the TLP bonded joint of single-crystalline Ni3Al. The simulation results reveal obvious stress concentration in the joint because of the different states of crystal orientation between single crystals and polycrystals, which may induce failure in the polycrystalline Ni3Al and weaken the mechanical strength of the TLP bonded joint. Furthermore, results also show that the decrease in the elastic modulus of the intermediate layer (i.e., polycrystalline Ni3Al) can relieve the stress concentration and improve the mechanical strength in the TLP bonded joint.

Sintered Properties of Y-TZP/ZrB2 Ceramics

2013 ◽  
Vol 372 ◽  
pp. 169-172 ◽  
Author(s):  
W.J. Kelvin Chew ◽  
Ramesh Singh ◽  
C.Y. Tan ◽  
M. Amiriyan ◽  
R. Tolouei ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Electrical Resistivity ◽  
Elastic Modulus ◽  
Room Temperature ◽  
Toughening Mechanisms ◽  
The Poor ◽  
Marginal Improvement

The effect of ZrB2 content ranging from 10 to 30 wt% on the mechanical properties and electrical resistivity of sintered Y-TZP/ZrB2 composite was investigated. While ZrB2 content showed marginal improvement in elastic modulus, the presence of up to 20 wt% ZrB2 was beneficial in densification and hardness of the composite when sintered at lower sintering temperatures. Significantly higher fracture toughness of all composites compared to monolithic Y-TZP implied that other toughening mechanisms are at work. In spite of the poor mechanical properties, Y-TZP/30 wt% ZrB2 showed the lowest electrical resistivity at room temperature.

Anealing Effect on the Microstructure and Mechanical Properties of LaB6 Films

2013 ◽  
Vol 303-306 ◽  
pp. 2514-2518 ◽  
Author(s):  
Li Jie Hu ◽  
Lin Zhang ◽  
Jie Lin ◽  
Guang Hui Min
Keyword(s):  
Mechanical Properties ◽  
Raman Spectrum ◽  
Elastic Modulus ◽  
Magnetron Sputtering ◽  
Cross Sections ◽  
Annealing Process ◽  
Dc Magnetron Sputtering ◽  
Microstructure And Mechanical Properties ◽  
Negative Effect ◽  
Deposited Films

Lathanum hexaboride films were deposited by dc magnetron sputtering with the same sputtering parameters. AFM, XRD, Raman spectrum was used to characterize the film. The as-deposited films were annealed at 400 oC, 500 oC and 600 oC, respectively. After 400 oC’s annealing, morphology of fracture cross-sections of the films exhibited evolutions from columnar to the equiaxial, and the crystallinity of the film was improved as well. It was also found annealing process generated negative effect on the film’s hardness and elastic modulus.

scholarly journals Research on the Gradual Process of the Metallization Structures and Mechanical Properties of Wood Veneer

Symmetry ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 550 ◽  
Author(s):  
Jingkui Li ◽  
Ruoying Wang ◽  
He Tian ◽  
Yanan Wang ◽  
Dawei Qi
Keyword(s):  
Mechanical Properties ◽  
Magnetron Sputtering ◽  
Wood Surface ◽  
Deposition Time ◽  
Copper Film ◽  
Wood Cellulose ◽  
Wood Veneer ◽  
Gradual Process ◽  
Veneer Surface ◽  
Moduli Of Elasticity

In order to improve the mechanical properties of the wood surface and explore the mechanical effect of wood veneer surface metallization, the 31-year-old Pinus sylvestris is taken as the research object and Cu is deposited on the wood surface by magnetron sputtering to achieve wood veneer metallization. Based on X-ray diffraction (XRD) and nanoindentation, a research on the gradual process of the structures and mechanical properties of wood veneer metallization was carried out. The results indicate that wood veneer metallization does not affect the crystallization zone of wood, there are still wood cellulose characteristic peaks and the crystalline structure of the wood cellulose is not damaged; the thickness of the copper thin film increases with the increase of the deposition time, the cellulose characteristic peak strength gradually decrease, and the relative crystallinity also decreases; the characteristic diffraction peaks of Cu (111), Cu (200), and Cu (220) appear near the diffraction angle 2θ which is equal to 43.3°, 50.4°, and 74.1°, and the diffraction peak intensity increases with increase of deposition time, the copper film of the metal wood veneer crystallizes well; the load–displacement of wood veneer decreases significantly with the increase of deposition time, while the moduli of elasticity and hardness increase rapidly. The load–displacement of the samples which were coated for 15 min decreased by 80%, while the moduli of elasticity and hardness of these samples increased by 24.1 times and 17.3 times, respectively. From the results of Scanning Electron Microscope (SEM) measurement of the metallization of wood veneer, it can be seen that the uniform and continuous copper film can be formed on the wood veneer surface by using the magnetron sputtering method. This paper provides a basis for wood veneer surface metallization, which is of great significance for the functional improvement of wood, the expansion of wood application fields, and the enhancement of added value.

scholarly journals Nanomechanical and Macrotribological Properties of CVD-Grown Graphene as a Middle Layer between Metal Pt Cylinders and SiO2/Si Substrate

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Hongyan Wu ◽  
Zhengbin Gu ◽  
Shantao Zhang ◽  
G. Hussain
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Friction Coefficient ◽  
Magnetron Sputtering ◽  
Microelectromechanical Systems ◽  
Middle Layer ◽  
Si Substrate ◽  
Wear Performance ◽  
Periodic Arrays ◽  
Grown Graphene

The CVD-grown graphene as a middle layer was introduced between Pt cylinders and SiO2/Si to extend the application of graphene for improving the wear performance of microelectromechanical systems. Periodic arrays of Pt cylinders were prepared on the graphene/SiO2/Si (Pt/graphene) and SiO2/Si substrate (Pt/SiO2) using the magnetron sputtering technique. To characterize Pt/graphene and Pt/SiO2, nanoindentation and macrotribological tests were performed. The results showed that the friction coefficient was lower and the wear lifetime of Pt/graphene was longer than those of Pt/SiO2. Graphene, as a middle layer, was not only observed to have significant influence on the mechanical properties (i.e., microhardness and elastic modulus), but also found to improve the adhesive strength between SiO2/Si and Pt cylinders.

Optical and Micro-Mechanical Properties of Ag-Based Low-E Glass by Magnetron Sputtering

2013 ◽  
Vol 477-478 ◽  
pp. 977-981 ◽  
Author(s):  
Jing Kai Yang ◽  
Hong Li Zhao ◽  
Li Ping Zhao ◽  
Jian Li
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Surface Morphology ◽  
Magnetron Sputtering ◽  
Figure Of Merit ◽  
Optoelectronic Properties ◽  
Tempering Time

Ag-based low-E films with a multilayer construction of top-Si3N4/SnO2/NiCrOx/Ag/ZnO/ NiCrOx/TiO2/under-SiOxNy were deposited on unheated glass by vacuum magnetron sputtering and then post-treated in the glass tempering furnace at 675±25°C for 4 min, 5 min and 6 min, respectively. The effects of tempering time on the surface morphology, optical and micro-mechanical properties have been investigated. The results show that the edge of the particles become vague with the increasing time. After tempering, the transmittance of 550 nm is higher than that of the as-deposited glass of 75.89%. Ag-based Low-E films tempered at 675±25°C for 6 min possess the biggest value of the figure of merit of 6.86×10-3 Ω-1 and exhibits the optimal optoelectronic properties. The composite nanohardness increase from 8.04 GPa to 9.23 GPa and the elastic modulus increases from 62.39 GPa to 84.58 GPa when tempered from 0 min to 6 min.

Mechanical Properties of Platinum Films on Silicon and Glass Determined by Ultra-Microindentation

1994 ◽  
Vol 356 ◽  
Author(s):  
Jaroslav Mencik ◽  
Michael V. Swain
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Magnetron Sputtering ◽  
Film Thickness ◽  
Composite Film ◽  
Data Evaluation ◽  
Contact Radius ◽  
Berkovich Indenter ◽  
Substrate Properties ◽  
Film Substrate

AbstractPlatinum films of thickness 0.5 - 1.2 - 3.0 μm, deposited by magnetron sputtering onto glass and silicon, were investigated using ultra-microindentation. The tests were done with a pointed (Berkovich) indenter. The values of the hardness and elastic modulus of the composite “film + substrate” and the substrates alone were obtained for various loads and depths of penetration, and used to evaluate the hardness and elastic modulus of the films. The use of various film thicknesses and substrates has enabled us to investigate in more detail the influence of the contact radius/contact depth compared to the film thickness as well as the substrate properties on the total indentation behaviour. Various approaches to the data evaluation are discussed in the paper.

Mechanical Properties of Recycled Aggregate Concrete at High and Low Water to Binder Ratios

2014 ◽  
Vol 629-630 ◽  
pp. 321-329
Author(s):  
Gai Fei Peng ◽  
Shuo Wang ◽  
Ting Li
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Sulfuric Acid ◽  
Elastic Modulus ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Original Research ◽  
Aggregate Concrete ◽  
Main Factor

This paper presents an original research on the influence of defects in recycled aggregate (RA) on mechanical properties of recycled aggregate concrete (RAC), including compressive strength, splitting tensile strength, fracture energy and elastic modulus. Six types of concretes, with the water to binder ratios (W/B) of 0.26 and 0.60, were prepared using nature aggregate (NA), RA and recycled aggregate treated by 3 mol/L (RA-H). Mechanical properties of RAC was inferior to that of NAC, and treated RA by sulfuric acid solution could improve the mechanical properties. Attached mortar in RA was the main factor resulting in the decrease of mechanical properties of RAC with 0.26 W/B, and for the RAC with 0.60 W/B, the effect of aggregate damage was more significant than that of attached mortar.

scholarly journals Particle Flow Analysis of Mechanical Properties and Failure Behaviour in Composite Rock Strata with Holes

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Chuanwei Zang ◽  
Hongmo Zhu ◽  
Miao Chen ◽  
Shuo Yang ◽  
Liu Yang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Stress Concentration ◽  
Flow Analysis ◽  
Confining Pressure ◽  
Peak Strength ◽  
Failure Behavior ◽  
Confining Pressures ◽  
Dip Angle ◽  
Rock Strata

Understanding the deformation failure behavior of the composite rock strata has important implications for deep underground engineering construction. Based on the uniaxial compression laboratory test of the specimens of composite rock strata containing holes, the microscopic parameters in the particle discrete element simulation are firstly calibrated. Then, the mechanical properties and failure characteristics of the composite rock strata with holes under different confining pressures are studied. The results show that different dip angles and confining pressures have significant effects on the peak strength and elastic modulus of the specimens. Under the same confining pressure, the peak strength and elastic modulus decrease first and then increase with the increasing dip angle. As the dip angle is constant, both the peak strength and elastic modulus gradually increase with the increase in confining pressure. It shows that the first area to be damaged in composite rock strata transfers from soft rock to hard rock with the increase in dip angle. With the increase in confining pressure, the range of tensile stress concentration area decreases substantially, while the range of compressive stress concentration area changes less.

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