Thickness Distribution Model of Condensate on Rotary Substrate by EB-PVD

2011 ◽  
Vol 418-420 ◽  
pp. 1031-1035
Author(s):  
Jun Shi ◽  
Guang Ping Song ◽  
Chuan Xin Zhang ◽  
Yue Sun ◽  
Xiu Lin ◽  
...  
Keyword(s):  
Physical Vapor Deposition ◽  
Thickness Distribution ◽  
Film Coating ◽  
Alloy Sheet ◽  
Measured Data ◽  
Distribution Model ◽  
Distribution Profile ◽  
Vapor Source ◽  
Large Size ◽  
Cosine Law

Large-size Ni-based alloy sheet was prepared by electron beam physical vapor deposition (EB-PVD). Thickness uniformity of large-size sheet for application is important. Based on the Knudsen’s cosine law and the character of the evaporation during EB-PVD, thickness distribution model of condensate on rotary substrate by EB-PVD was established. The thickness model is not consistent with the traditional cosine law, but cosnθ relationship, n=5.3 in this paper. The predicted data of thickness model agrees well with the measured data. The thickness distribution model is not limited to specific vapor source material, therefore, it provides significant insight on the thickness distribution profile for film, coating and sheet deposited on the rotary substrate by EB-PVD.

scholarly journals CVD and PVD coating process modelling by using artificial neural networks

2012 ◽  
Vol 1 (1) ◽  
pp. 46 ◽  
Author(s):  
Amir Mahyar Khorasani ◽  
Mohammad Reza Solymany yazdi ◽  
Mehdi Faraji ◽  
Alex Kootsookos
Keyword(s):  
Thin Film ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Chemical Vapor ◽  
Film Coating ◽  
Deposition Process ◽  
Thin Film Coating ◽  
Mlp Neural Network ◽  
Titanium Thin Film ◽  
Pvd Coating

Thin-film coating plays a prominent role on the manufacture of many industrial devices. Coating can increase material performance due to the deposition process. Having adequate and precise model that can predict the hardness of PVD and CVD processes is so helpful for manufacturers and engineers to choose suitable parameters in order to obtain the best hardness and decreasing cost and time of industrial productions. This paper proposes the estimation of hardness of titanium thin-film layers as protective industrial tools by using multi-layer perceptron (MLP) neural network. Based on the experimental data that was obtained during the process of chemical vapor deposition (CVD) and physical vapor deposition (PVD), the modeling of the coating variables for predicting hardness of titanium thin-film layers, is performed. Then, the obtained results are experimentally verified and very accurate outcomes had been attained.

A Study on Tensile Deformation Features of Ni-Based Super-Alloy Prepared by EB-PVD

2011 ◽  
Vol 55-57 ◽  
pp. 251-256
Author(s):  
Li Ma ◽  
Ting Zhang ◽  
Xiao Li ◽  
Zhao Hui Hu
Keyword(s):  
Physical Vapor Deposition ◽  
Large Scale ◽  
Tensile Deformation ◽  
Alloy Sheet ◽  
Dislocation Climb ◽  
Dislocation Glide ◽  
Double Phase ◽  
Transmission Electron ◽  
Deformation Features ◽  
Super Alloy

Large-scale Ni-based super-alloy sheet has been prepared by electron beam physical vapor deposition (EB-PVD). Microstructure and the dislocation structures in the γ-γ′ double phase alloy under different temperature after tensile strain are studied with Transmission electron microscopy (TEM). The results show that the dislocation glide in single slip system and shearing mechanics, the dislocation climb with part shearing, absolute dislocation climb and cross slip, dislocation round are a course of the interacting degree between dislocation and γ′ phase gradually weakened under the tensile temperature from room temperature to high temperature, so as to decrease materials strength and increase plasticity.

A Study on Adhesive Properties of a Damascene Electroplated Cu Composite Sheet

2011 ◽  
Vol 695 ◽  
pp. 577-580
Author(s):  
Hyung Kwon Moon ◽  
Seung Boo Jung ◽  
Je Sik Shin
Keyword(s):  
High Strength ◽  
Film Coating ◽  
Peel Strength ◽  
Alloy Sheet ◽  
Composite Sheet ◽  
Adhesive Properties ◽  
Thin Film Coating ◽  
Cu Alloy ◽  
Wedge Bonding ◽  
Interconnect Material

In this paper, it was aimed to develop a new interconnect material having high electrical conductivity and strength simultaneously. The Cu composite sheet, possessing mesh type Ag conduction paths on the surface of a high strength Cu alloy sheet, was manufactured by damascene electroplating. The peel strength of Cu composite sheet prepared by damascene electroplating increased by above 50 times compared to Cu composite sheet by conventional electroplating. Al wire wedge bonding was able to be successfully conducted without extra metal thin film coating.

OIL THICKNESS DETECTION USING WIDEBAND RADIOMETRY

1995 ◽  
Vol 1995 (1) ◽  
pp. 15-19 ◽  
Author(s):  
O. B. McMahon ◽  
E. R. Brown ◽  
G. D. Daniels ◽  
T. J. Murphy ◽  
G. L. Hover
Keyword(s):  
Millimeter Wave ◽  
Oil Spills ◽  
Thickness Distribution ◽  
Measured Data ◽  
Laboratory Setting ◽  
Frequency Scanning ◽  
Oil Water ◽  
Bodies Of Water ◽  
Oil Films ◽  
Oil Thickness

ABSTRACT A major problem in the cleanup of oil spills on large bodies of water is determining the oil thickness distribution since much of the oil can be contained in a small fraction of the spill area. Knowledge of the location of the thick patches allows one to use cleanup resources more efficiently. To address this problem, we have designed, built and tested a millimeter-wave, frequency-scanning radiometer for remotely determining the thickness of oil films. The work is based on the theory of the frequency-scanning radiometer. Experimental results, obtained in an outdoor laboratory setting, show agreement between our theory and measured data for oil thicknesses ranging from 0 to 10 mm in 1 mm steps. A visible change was obtained for 0.1 mm steps from 0.0 to 1.0 mm of oil. The study also demonstrated that thin oil/water emulsions are detectable.

Internal Stress of ZnO thin Films Caused by Thickness Distribution and Crystallinity

1998 ◽  
Vol 518 ◽  
Author(s):  
M. Takeuchi ◽  
K. Inoue ◽  
Y. Yoshino ◽  
K. Ohwada
Keyword(s):  
Thin Films ◽  
Stress Distribution ◽  
Thickness Distribution ◽  
Zno Thin Films ◽  
Optimum Thickness ◽  
X Ray Diffraction ◽  
Axis Orientation ◽  
X Ray ◽  
Argon Ions ◽  
Cosine Law

AbstractThe improvement of thickness distribution and crystallinity in ZnO thin films prepared by radio frequency (rf) planer magnetron sputtering has been studied. Optimum thickness distribution of less than ± 2.2% in a 3-inch wafer is obtained by changing the substrate angle to the ZnO target and is in accordance with cosine law. The c-axis orientation perpendicular to the silicon substrate is confirmed by x-ray diffraction. The stress of ZnO thin films is larger than 0.3GPa and its distribution is independent of the substrate angle that is set at a slant to the optimum angle for thickness distribution. These results indicate that thickness distribution of ZnO thin films heavily depends on the substrate angle, while the stress and its distribution are independent of the setting angle of the substrate. Stress distribution is attributed to the distribution of argon ions and sputtered molecules impinging a wafer.

Numerical Simulation of Bulging Process of Aluminum Alloy Sheet

2013 ◽  
Vol 327 ◽  
pp. 112-116 ◽  
Author(s):  
Mao Ting Li ◽  
Yong Zhang ◽  
Chui You Kong
Keyword(s):  
Aluminum Alloy ◽  
Material Flow ◽  
Thickness Distribution ◽  
Superplastic Forming ◽  
Alloy Sheet ◽  
Pressure Loading ◽  
Forming Process ◽  
Element Analysis ◽  
Danger Zone ◽  
Linear Finite Element

Basing on software MSC. Marc of non-linear finite element analysis, the article has studied the material flow in the process of aluminum alloy superplastic gas bulging forming. By analyzing of the thickness distribution of the molding member it confirm the danger zone in the forming process. By analyzing of pressure loading curve influence on forming part. Because the aluminum alloy is widely used in the industrial departments, it is supposed to improve the ability of forming ability of aluminum alloy by researching the superplastic forming.

Microstructure of Fe-Based ODS High-Temperature Alloy Sheet Prepared by EBPVD

2007 ◽  
Vol 353-358 ◽  
pp. 1637-1640 ◽  
Author(s):  
Xiu Lin ◽  
Yue Sun ◽  
Guang Pin Song ◽  
Xiao Dong He
Keyword(s):  
High Temperature ◽  
Substrate Temperature ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Orientation Angle ◽  
Alloy Sheet ◽  
Columnar Microstructure ◽  
High Temperature Alloy ◽  
Vapor Deposition Technique ◽  
Physical Vapor Deposition Technique

Large-sized Fe-based ODS (Oxide Dispersive Strengthen) high-temperature alloy sheets were successfully synthesized by EBPVD (Electron Beam Physical Vapor Deposition) technique. The sheets were about 120μm thick, and having a diameter of 1000mm, whose surface roughness was less than 1μm (Ra<1μm). The microstructures were examined by SEM (Scanning Electron Microscope). The grain size was 1-4μm. When the substrate temperature was 600°C, the sheet had sharp irregular polyhedral grain, and when the substrate temperature was 700°C the sheet had quite regular grains. The morphological orientation angle increased with the distance from the center of the sheet. During the first period of deposition, the sheet was growing in a G-L-S mode, which corresponded with the corn-like microstructure in the cross-section. While during the final period, the sheet changed into a G-S growing mode, which corresponded to the smooth columnar microstructure.

The Fading Characteristic of the GSM-R Network’s Field Intensity under Raining Condition

2011 ◽  
Vol 403-408 ◽  
pp. 2740-2745
Author(s):  
Ke Sun ◽  
Xin Yu Jin ◽  
Lu Rong Jiang ◽  
Xiang Bing Zeng
Keyword(s):  
Field Intensity ◽  
Theoretical Basis ◽  
Electromagnetic Waves ◽  
Random Medium ◽  
Mie Theory ◽  
Signal Strength ◽  
Measured Data ◽  
Severe Weather ◽  
Distribution Model ◽  
Scattered Power

The signal strength of the GSM-R network’s field intensity attenuates under raining condition due to the raindrop’s absorption and scattering. Moreover, the fading characteristic is influenced greatly by the scattering effect of the rainfall. Without regard to the landform and other factors, this paper uses Mie Theory to research the receiving level’s attenuation coefficient at different rainfall rates. And the related knowledge of electromagnetic waves through random medium is used to analyze the receiving level’s fading characteristic under raining condition. Analytical results indicate that the fading distribution model of the receiving level in GSM-R network is changed, except for the strength’s attenuation. Moreover, the fading depth grows under raining condition as a result of the scattered power caused by the raindrop. The analysis in this paper is proved by the measured data along the test section of Beijing-Tianjin line, and the research results provide the theoretical basis for GSM-R network’s anti-fading measures in the severe weather.

Superplastic Forming Response of a Friction Stir Processed Mg Alloy Sheet – A Numerical Approach

2012 ◽  
Vol 735 ◽  
pp. 192-197 ◽  
Author(s):  
Mohammad Albakri ◽  
Bilal Mansoor ◽  
Ahmad Albakri ◽  
Marwan Khraisheh
Keyword(s):  
Thickness Distribution ◽  
Base Material ◽  
Superplastic Forming ◽  
Numerical Approach ◽  
Processing Technique ◽  
Alloy Sheet ◽  
Mg Alloy ◽  
Dome Height ◽  
Friction Stir ◽  
Forming Characteristics

Friction stir process (FSP) is a severe plastic deformation based secondary processing technique that can be utilized to engineer novel microstructures in metallic alloys. It is well known that such techniques are cumbersome and require significant experimental work and material to determine optimum processing conditions. Therefore in this work, we propose a new two step numerical approach, where: (i) CFD simulations coupled with Zener-Holloman relation are used to predict microstructure evolution in stirred, transition and heat affected zones of friction stir processed AZ31 Mg alloy sheets, (ii) Finite element simulations are carried out to evaluate superplastic forming characteristics of different microstructures developed after FSP. Simulation trends including forming pressure profiles, dome height evolution, and thickness distribution of friction stir processed sheets are compared with those of the base material. The proposed combination of numerical approaches to model both processing and forming aspects yields a powerful tool to study and optimize processing and forming technologies with limited experimentation.

An Analytical Study on Influence of Movement Conditions of Ultrasonic Atomizing Nozzle on Performance of Spray Coating

2011 ◽  
Vol 52-54 ◽  
pp. 393-398
Author(s):  
Yu Lieh Wu ◽  
Ya Koa Lee ◽  
Wei Yen Chuang ◽  
Yung Hsun Wang
Keyword(s):  
Flow Field ◽  
Simulation Analysis ◽  
Substrate Surface ◽  
Thickness Distribution ◽  
Spray Coating ◽  
Film Coating ◽  
Lateral Movement ◽  
Monitoring Point ◽  
Ultrasonic Atomization ◽  
Movement Distance

This study aimed to make the slurry droplets atomized by the ultrasonic atomization spray coating diversion system fall on the substrate surface of hot plate stably, instead of rebound or spill due to overly high pressure or speed that causes material waste and excessive or non-uniform spray coating. The lateral movement distance of the nozzle influences the uniformity of film thickness distribution, while the lateral movement distance influences the film uniformity and the spray coating efficiency; these two are important parameters to the efficiency of ultrasonic spraying equipments. Therefore, this study conducted a simulation analysis on the atomization flow field of ultrasonic atomization diversion systems, where the distribution of atomization flow field was analyzed at different lateral movement distances of the nozzle. By evaluating the performance of thin film coating, this study attempted to find out the optimal lateral movement distance of ultrasonic precision spray coating. The simulation analysis results were tested on a real machine for validation in order to identify the reliability of the simulation. The simulation result showed that the central part of the film in the position sprayed was thicker; therefore, the nozzle moved 1 cm horizontally at 0.1m/s to thicken the repeatedly sprayed area to improve the overall uniformity of the panel. The study analyzed the spray coating thicknesses according to 16 monitoring points in the repeatedly sprayed area on the panel. According to the thicknesses of the monitoring point positions, when the area that had been sprayed once was sprayed again by the nozzle moving 1cm laterally, the uniformity of overall film on the overall panel was improved significantly.

Sign in / Sign up

Export Citation Format

Share Document