Construction and control of 3D porous structure based on vapor deposition on sublimation solids

2017 ◽  
Vol 7 ◽  
pp. 77-81 ◽  
Author(s):  
Hsing-Ying Tung ◽  
Ting-Pi Sun ◽  
Ho-Yi Sun ◽  
Zhen-Yu Guan ◽  
Shu-Kai Hu ◽  
...  
Keyword(s):  
Porous Structure ◽  
Vapor Deposition ◽  
And Control

scholarly journals Instrumentation and control of an aerosol-assisted chemical vapor deposition system (AACVD)

DYNA ◽  
2019 ◽  
Vol 86 (210) ◽  
pp. 52-57 ◽  
Author(s):  
Eduart Yesid Castrillón González ◽  
Jorge Mario Hicapie Zapata ◽  
Beatriz Cruz Muñoz ◽  
Ruben Jose Dorantes Rodriguez ◽  
Milton Humberto Medina Barreto
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Precursor Solution ◽  
Experimental Methods ◽  
Displacement Control ◽  
Electronic Components ◽  
Hot Air ◽  
Nozzle Temperature ◽  
And Control

Aerosol-assisted chemical vapor deposition (AACVD) is a technique implicates the atomization of a precursor solution into fine droplets which are dragged by a hot air flow throughout mobile nozzle unto heated reaction zone where occurring chemical reactions. In this work, implementation of the mechanical, electrical and electronic components for AACVD in descriptive way is presented. Equipment and experimental methods implemented are described, together to the automatization criteria of nozzle, temperature control of the heating plate and nebulizing system. The flowchart, the logic sequence of the speed control programming and statistical analysis of the nozzle displacement control were completed and checked, therefore an adequate link between the diverse components via Arduino with the design and automatization criteria was achieved. Finally, we conclude that the criteria and automatization process used permitted successfully to make uniform and reproducible coatings.

scholarly journals Preparation and Control of Magnetic Properties of Ultrafine Iron Particles by Chemical Vapor Deposition of Fe(CO)5.

1994 ◽  
Vol 20 (3) ◽  
pp. 367-372
Author(s):  
Yoshiaki Sawada ◽  
Yoshiteru Kageyama ◽  
Masashi Iwata ◽  
Shigehisa Harada ◽  
Akira Tasaki
Keyword(s):  
Magnetic Properties ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Iron Particles ◽  
And Control

Controlled growth of gallium nitride single-crystal nanowires using a chemical vapor deposition method

2003 ◽  
Vol 18 (2) ◽  
pp. 245-249 ◽  
Author(s):  
Song Han ◽  
Wu Jin ◽  
Tao Tang ◽  
Chao Li ◽  
Daihua Zhang ◽  
...  
Keyword(s):  
Gallium Nitride ◽  
Chemical Vapor Deposition ◽  
Single Crystal ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Gold Clusters ◽  
Chemical Vapor Deposition Method ◽  
Nanowire Diameter ◽  
Nanobuilding Blocks ◽  
And Control

Chemical vapor deposition (CVD) using gold nanoparticles as the catalyst to grow high-quality single-crystal gallium nitride nanowires was developed. This method enables control over several important aspects of the growth, including control of the nanowire diameter by using monodispersed gold clusters, control of the nanowire location via e-beam patterning of the catalyst sites, and control of the nanowire orientation via epitaxial growth ona-plane sapphire substrates. Our work opens up new ways to use GaN nanowires as nanobuilding blocks.

scholarly journals Water Vapor Corrosion Behavior of Yb2SiO5 Environmental Barrier Coatings Prepared by Plasma Spray-Physical Vapor Deposition

Coatings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 392 ◽  
Author(s):  
Chao Wang ◽  
Min Liu ◽  
Junli Feng ◽  
Xiaofeng Zhang ◽  
Chunming Deng ◽  
...  
Keyword(s):  
Water Vapor ◽  
Porous Structure ◽  
Plasma Spray ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Ceramic Matrix Composite ◽  
Environmental Barrier Coatings ◽  
Environmental Barrier ◽  
Barrier Coating ◽  
Water Vapor Corrosion

Tri-layer Si/mullite/Yb2SiO5 environmental barrier coating (EBC) was prepared on the SiCf/SiC ceramic matrix composite (CMC) by plasma spray-physical vapor deposition (PS-PVD). The EBC samples were carried out with water vapor corrosion at 1300 °C for 200 h. After steam corrosion, Yb2SiO5 layer forms a gradient porous structure. This is mainly due to the inclusion of SiO2-rich layer which is precipitated from the gasification inside the coating and existing a small amount of Yb2O3 separately. During the corrosion process, water vapor infiltrates into the coating and reacts with the SiO2 and Yb2O3 to generate volatile substances. This forms a porous structure to make the coating brittle, resulting in mud cracks finally. In addition, the results show that the Yb2SiO5 can react with the water vapor at the coating surface, forming an Yb2Si2O7 top layer.

Monitoring and Control in Vapor phase Epitaxy

1997 ◽  
Vol 502 ◽  
Author(s):  
T. P. Pearsall
Keyword(s):  
Control System ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Growth Conditions ◽  
Temperature Control System ◽  
Monitoring And Control ◽  
Non Invasive ◽  
Innovative Solutions ◽  
Precision And Accuracy ◽  
And Control

ABSTRACTMonitoring and control in epitaxy based on chemical vapor deposition is a challenge created by growth conditions that often preclude more common sensors like thermocouples and mass spectrometry. We report results of experiments to measure and control temperature and flux by non-invasive optical sensing. We have developed a temperature control system with precision and accuracy better that 5°C. Satisfactory control of flux poses difficulties that will require innovative solutions before a useful control system can be developed.

Thermal Contact Conductance of Metallic Coated BiCaSrCuO Superconductor/Copper Interfaces at Cryogenic Temperatures

1992 ◽  
Vol 114 (1) ◽  
pp. 21-29 ◽  
Author(s):  
J. M. Ochterbeck ◽  
G. P. Peterson ◽  
L. S. Fletcher
Keyword(s):  
Vapor Deposition ◽  
Thermal Contact ◽  
Deposition Process ◽  
Thermal Contact Conductance ◽  
Experimental Program ◽  
Contact Conductance ◽  
Nickel Substrates ◽  
Deposition Processes ◽  
Cold Pressed ◽  
And Control

The effects of vapor deposited coatings on the thermal contact conductance of cold pressed, normal state BiCaSrCuO superconductor/oxygen-free copper interfaces were experimentally investigated over a pressure range of 200 to 2000 kPa. Using traditional vapor deposition processes, thin coatings of indium or lead were applied to the superconductor material to determine the effect on the heat transfer occurring at the interface. The test data indicate that the contact conductance can be enhanced using these coatings, with indium providing the greater enhancement. The experimental program revealed the need for a better understanding and control of the vapor deposition process when using soft metallic coatings. Also, the temperature-dependent microhardness of copper was experimentally determined and found to increase by approximately 35 percent as the temperature decreased from 300 to 85 K. An empirical model was developed to predict the effect of soft coatings on the thermal contact conductance of the superconductor/copper interfaces. When applied, the model agreed well with the data obtained in this investigation at low coating thicknesses but overpredicted the data as the thickness increased. In addition, the model agreed very well with data obtained in a previous investigation for silver-coated nickel substrates at all coating thicknesses.

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