scholarly journals Fabrication of a Zinc Aluminum Oxide Nanowire Array Photoelectrode for a Solar Cell Using a High Vacuum Die Casting Technique

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Chin-Guo Kuo ◽  
Jung-Hsuan Chen ◽  
Yueh-Han Liu
Keyword(s):  
Aluminum Alloy ◽  
Aluminum Oxide ◽  
Die Casting ◽  
Nanowire Array ◽  
High Vacuum ◽  
Hydraulic Pressure ◽  
Characteristic Analysis ◽  
X Ray ◽  
Vacuum Die Casting ◽  
Zinc Aluminum Oxide

Zinc aluminum alloy nanowire was fabricated by the vacuum die casting. Zinc aluminum alloy was melted, injected into nanomold under a hydraulic pressure, and solidified as nanowire shape. Nanomold was prepared by etching aluminum sheet with a purity of 99.7 wt.% in oxalic acid solution. A nanochannel within nanomold had a pore diameter of 80 nm and a thickness of 40 μm. Microstructure and characteristic analysis of the alumina nanomold and zinc-aluminum nanowire were performed by scanning electron microscope, X-ray diffraction analysis, and energy dispersive X-ray spectroscopy. Zinc aluminum oxide nanowire array was produced using the thermal oxidation method and designed for the photoelectrode application.

scholarly journals Fabrication of a Miniature Zinc Aluminum Oxide Nanowire Array Gas Sensor and Application for Environmental Monitoring

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Chin-Guo Kuo ◽  
Chi-Wu Huang ◽  
Jung-Hsuan Chen ◽  
Yueh-Han Liu
Keyword(s):  
Aluminum Alloy ◽  
Aluminum Oxide ◽  
Gas Sensor ◽  
Gas Sensing ◽  
Operating Temperature ◽  
Nanowire Array ◽  
Weight Percentage ◽  
Casting Technique ◽  
Semiconductor Gas Sensor ◽  
Zinc Aluminum Oxide

A miniature n-type semiconductor gas sensor was fabricated successfully using zinc aluminum oxide nanowire array and applied to sense oxygen. The present study provided a novel method to produce zinc aluminum alloy nanowire 80 nm in diameter by the vacuum die casting technique and then obtain zinc aluminum oxide nanowire array using the thermal oxidation technique. The gas sensing properties were evaluated through the change of the sensitivity. The factors influencing the sensitivity of the gas sensor, such as the alloy composition, operating temperature, and oxygen concentration, were investigated further. Experimental results indicated that the maximum sensitivity could be acquired when the weight percentage of aluminum was 5% in zinc aluminum alloy at the operating temperature of200°C.

Fabrication of a Pb-Sn nanowire array gas sensor using a novel high vacuum die casting technique

2013 ◽  
Vol 9 (4) ◽  
pp. 481-484 ◽  
Author(s):  
Chin-Guo Kuo ◽  
Ho Chang ◽  
Lih-Ren Hwang ◽  
Shu Hor ◽  
Jia-Shin Chen ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Die Casting ◽  
Nanowire Array ◽  
High Vacuum ◽  
Casting Technique ◽  
Vacuum Die Casting

Template Synthesis of Indium Nanowires Using Anodic Aluminum Oxide Membranes

2008 ◽  
Vol 8 (9) ◽  
pp. 4488-4493 ◽  
Author(s):  
Feng Chen ◽  
Adrian H. Kitai
Keyword(s):  
Aluminum Oxide ◽  
Template Synthesis ◽  
Anodic Aluminum Oxide ◽  
Preferred Orientation ◽  
Hydraulic Pressure ◽  
X Ray Diffraction ◽  
Aao Template ◽  
X Ray ◽  
Anodic Aluminum ◽  
Oxide Membranes

Indium nanowires with diameters approximately 300 nm have been synthesized by a hydraulic pressure technique using anodic aluminum oxide (AAO) templates. The indium melt is injected into the AAO template and solidified to form nanostructures. The nanowires are dense, continuous and uniformly run through the entire ∼60 μm thickness of the AAO template. X-ray diffraction (XRD) reveals that the nanowires are polycrystalline with a preferred orientation. SEM is performed to characterize the morphology of the nanowires.

Investigations of the High Vacuum Die Castings of Dumbbell Specimens

2009 ◽  
Vol 628-629 ◽  
pp. 727-734
Author(s):  
Rong Yuan Jou
Keyword(s):  
Die Casting ◽  
High Vacuum ◽  
Testing Machine ◽  
Casting Process ◽  
Process Use ◽  
Vacuum Die Casting ◽  
Small Feature ◽  
Visualization Experiments ◽  
Die Casting Process ◽  
Die Castings

Compare to atmosphere die casting or moderate vacuum die casting process, use of the high vacuum die casting can enhance excluding gas volumes in the mold, improve the casting mechanical properties and density, and increase the fabrication feasibility for casting small feature size, shape, and higher quality of product. The process of high vacuum die casting for dumbbell specimens is established and implemented for evaluation of this innovative manufacturing technology. A transparent acrylic mold is fabricated to investigate the vacuum injection for vacuum die casting process and a metal mold is fabricated to test the real manufacturing of high vacuum die casting. To visualize the flowing pattern inside the mold under the consequence of evacuation processing, flow visualization experiments are conducted. Then, the specimen is molded by the high vacuum die casting process and the specimen castings are test by a universal testing machine for its loading-elongation relationship. The porosities of specimen casting are examined by scale weighting and direct visual inspection ways. Experimental results show that the high vacuum die casting process is effective to reduce the porosity (5.47% increment in weight) and to increase the strength (4.83% increment in maximum stress) of the investigated specimen. An obviously vortex roll is established along the centerline position of dumbbell specimen which may be became the source of porosity in real processing. Meanwhile, an excellent vacuum sealing is critical to the success of high vacuum die casting.

Key Technologies in the Design of a Vacuum Die Casting Mould for Aluminum Alloy Joints

2010 ◽  
Vol 97-101 ◽  
pp. 390-394
Author(s):  
Xiao Hong Ge ◽  
Hong Wu Huang ◽  
Hui Li ◽  
Hui Huang Yang
Keyword(s):  
Aluminum Alloy ◽  
Die Casting ◽  
High Strength ◽  
Casting Process ◽  
Whole Process ◽  
Vacuum Die Casting ◽  
Section Design ◽  
Bus Body ◽  
Die Casting Process ◽  
Cae Simulation

Aluminum alloy joints are a key component of a light-weight bus body, hence, they have a complicated structure and high strength requirement. A vacuum die casting mould has been developed and joints have been manufactured using a CAE simulation, a “whole-process-vacuum exhaust” vacuum die casting process and a decreased cross-section design for vacuum-pumping. The joint’s internal porosity has been noticeably reduced and its mechanical properties have been considerably improved in comparison with joints manufactured from die casting.

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