scholarly journals Mechanism of High Friction of the Aluminum Surface Textured by Laser Micro Texturing

2019 ◽  
Vol 2019 (0) ◽  
pp. 1010B1030
Author(s):  
Yuki SATO ◽  
Yosuke TSUKIYAMA ◽  
Isami NITTA ◽  
Hiroshi SHIOMI
Keyword(s):  
Aluminum Surface

Basic Physics in Color-Coded EOS Metallization Failures (Differentiating between EOS and ESD)

1998 ◽  
Author(s):  
Leo G. Henry ◽  
J.H. Mazur
Keyword(s):  
Failure Analysis ◽  
Light Microscope ◽  
Structural Changes ◽  
Surface Oxide ◽  
Aluminum Surface ◽  
Surrounding Area ◽  
Die Surface ◽  
Basic Physics ◽  
Direct Contrast ◽  
Glass Interface

Abstract The task of differentiating precisely between EOS and ESD failures continues to be a challenging one for Failure Analysis Engineers. Electrical OverStress (EOS) failures on the die surface (burnt/fused metallization) of an IC can be characterized mainly by the discoloration at the site of the failures. This is in direct contrast to the lack of discoloration characteristic of ESD failures, which occur almost exclusively below the die surface (oxide and junction failures). To aid in this distinction, this paper attempts to present the underlying physics behind the discoloration produced in the EOS failures. For the EOS failures, the metal fuses due to the longer pulse widths (sec to msec), while for the ESD failures, the silicon melts because of the shorter pulse widths (< < 500 nsec) and higher energy. After EOS, the aluminum surface becomes dark and rough and the oxide in the surrounding area becomes deformed and distorted, resulting in the discoloration observed in the light microscope. This EOS discoloration could be due to one or more of the following: 1) morphological and structural changes at the metal/glass interface and the glass itself; 2) changes in the thickness and scattering behavior of the glass and metal in the failed areas.

Cast Aluminum Surface Reinforced with Carbon Nanotube via Solubilization Treatment

2021 ◽  
Author(s):  
Paulo R. O. Brito ◽  
Cristhian R. L. Loayza ◽  
Mário E. S. Sousa ◽  
Eduardo M. Braga ◽  
Rômulo S. Angélica ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Aluminum Surface ◽  
Cast Aluminum

Effect of Surface Roughness on Pool Boiling Heat Transfer of Water on a Superhydrophilic Aluminum Surface

2017 ◽  
Vol 139 (10) ◽  
Author(s):  
Jinsub Kim ◽  
Seongchul Jun ◽  
Jungho Lee ◽  
Juan Godinez ◽  
Seung M. You
Keyword(s):  
Heat Transfer ◽  
Surface Roughness ◽  
Boiling Heat Transfer ◽  
Aluminum Surface ◽  
Transfer Coefficients ◽  
Copper Surfaces ◽  
Heat Transfer Coefficients ◽  
Superhydrophilic Surface ◽  
Aluminum Surfaces ◽  
Effect Of Surface

The effect of surface roughness on the pool boiling heat transfer of water was investigated on superhydrophilic aluminum surfaces. The formation of nanoscale protrusions on the aluminum surface was confirmed after immersing it in boiling water, which modified surface wettability to form a superhydrophilic surface. The effect of surface roughness was examined at different average roughness (Ra) values ranging from 0.11 to 2.93 μm. The boiling heat transfer coefficients increased with an increase in roughness owing to the increased number of cavities. However, the superhydrophilic aluminum surfaces exhibited degradation of the heat transfer coefficients when compared with copper surfaces owing to the flooding of promising cavities. The superhydrophilic aluminum surfaces exhibited a higher critical heat flux (CHF) than the copper surfaces. The CHF was 1650 kW/m2 for Ra = 0.11 μm, and it increased to 2150 kW/m2 for Ra = 0.35 μm. Surface roughness is considered to affect CHF as it improves the capillary wicking on the superhydrophilic surface. However, further increase in surface roughness above 0.35 μm did not augment the CHF, even at Ra = 2.93 μm. This upper limit of the CHF appears to result from the hydrodynamic limit on the superhydrophilic surface, because the roughest surface with Ra = 2.93 μm still showed a faster liquid spreading speed.

Investigation of the Preparation of Anodized Nanoporous Alumina Array

2014 ◽  
Vol 887-888 ◽  
pp. 766-769 ◽  
Author(s):  
Huey Ling Chang ◽  
Chih Ming Chen ◽  
Chin Huang Sun ◽  
Jin Shyong Lin
Keyword(s):  
Anodic Oxidation ◽  
Self Assembly ◽  
Aluminum Surface ◽  
Nanostructured Film ◽  
Oxidation Treatment ◽  
Anodic Aluminum ◽  
Nanoporous Template ◽  
Anodic Oxidation Treatment ◽  
Stable Control

This study produced a regularly arranged membrane, called anodic aluminum oxide (referred AAO), by mean of anodic oxidation treatment. The structure of AAO can be molecular self-assembly and its pore size is consistent. Also, the manufacturing process cost is low. These properties make the AAO be a nanotemplate material. This study further created a high quality of nanostructured film by electrochemical mould with the design of electrolyzer. In addition, a uniform nanothin film was grown on the aluminum surface in the stable control of current and temperature according to the conditions of different anode treatment. This film can form a nanopore array which the diameter can be controlled the size ranging from 15 nm to 400 nm. As results, the study can produce nanoporous template for various aperture by mean of anodic oxidation.

scholarly journals Influence of Aluminum Surface Morphology on Electroluminescent Intensity.

2000 ◽  
Vol 51 (7) ◽  
pp. 714-717 ◽  
Author(s):  
Tomokazu MAENO ◽  
Go TANIGAWA ◽  
Shigeyoshi MORISAKI
Keyword(s):  
Surface Morphology ◽  
Aluminum Surface

scholarly journals Thin Film Heater for Removable Volatile Protecting Coatings

2013 ◽  
Vol 2013 ◽  
pp. 1-3
Author(s):  
Abid Karim
Keyword(s):  
Thin Film ◽  
Aluminum Surface ◽  
Space Astronomy ◽  
Far Ultraviolet

Freshly coated aluminum mirrors have excellent reflectivity at far ultraviolet wavelengths. However, reflectivity rapidly degrades when the mirror surfaces are exposed to atmosphere. In order to avoid this problem, freshly coated aluminum surface can be protected by over-coating of a removable volatile protecting coating. This protecting coating can be re-evaporated by controlled heating or by some other methods when required. This type of removable coating has immediate application in UV space astronomy. The purpose of this paper is to demonstrate the feasibility of re-evaporation of removable volatile Zn protecting coating using a NiCr thin film heater without affecting the reflection properties of Al mirror surfaces.

Aluminum surface treatment by the RF plasma pencil

2012 ◽  
Vol 206 (19-20) ◽  
pp. 4140-4145 ◽  
Author(s):  
V. Prysiazhnyi ◽  
T. Svoboda ◽  
M. Dvořák ◽  
M. Klíma
Keyword(s):  
Surface Treatment ◽  
Aluminum Surface ◽  
Rf Plasma ◽  
Plasma Pencil

EXPRESS: Spectral Considerations for Standoff Infrared Detection of RDX on Reflective Aluminum

2021 ◽  
pp. 000370282110538
Author(s):  
Kevin J Major ◽  
Jas Sanghera ◽  
Mikella E. Farrell ◽  
Ellen L Holthoff ◽  
Paul M Pellegrino ◽  
...  
Keyword(s):  
Surface Concentration ◽  
Thin Layers ◽  
Infrared Detection ◽  
Aluminum Surface ◽  
Material System ◽  
Spectral Signatures ◽  
Spectral Changes ◽  
Standoff Detection ◽  
Infrared Spectrometer ◽  
Specific Material

This paper examines infrared spectroscopic effects for the standoff detection of an explosive material, hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX), inkjet printed on an aluminum surface. Results of a spectroscopic study are described, using multiple optical setups. These setups were selected to explore how variations in the angles of incidence and collection from the surface of the material result in corresponding variations in the spectral signatures. The goal of these studies is to provide an understanding of these spectral changes, since it affects standoff detection of hazardous materials on a reflective substrate. We demonstrate that variations in spectral effects are dependent on the relative surface concentration of the deposited RDX. We also show that it is reasonable to use spectroscopic data collected in a standard laboratory infrared spectrometer outfitted with a variable angle reflectometer set at 0 as reference spectra for data collected in a standoff configuration. These results are important to provide a systematic approach to understanding IR spectra collection using standoff systems in the field, and to allow for comparison between such data, and data collected in the laboratory. Though the precise results are constrained to a specific material system (thin layers on a reflective substrate), the approach and general discussion provided are applicable to a broad range of IR standoff sensing techniques and applications.

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