Directed Vapor Deposition of a Cadmium Replacement Coating for High Strength Fasteners

2009 ◽  
Author(s):  
Adam Goff
Keyword(s):  
Vapor Deposition ◽  
High Strength ◽  
Directed Vapor Deposition

Directed Vapor Deposition: Low Vacuum Materials Processing Technology

2000 ◽  
Author(s):  
J. F. Groves ◽  
G. Mattausch ◽  
H. Morgner ◽  
D. D. Hass ◽  
H. N. Wadley
Keyword(s):  
Vapor Deposition ◽  
Processing Technology ◽  
Materials Processing ◽  
Directed Vapor Deposition

Electron Beam - Directed Vapor Deposition of Multifunctional Structures

2001 ◽  
Vol 672 ◽  
Author(s):  
D. T. Queheillalt ◽  
Y. Katsumi ◽  
H. N. G. Wadley
Keyword(s):  
Electron Beam ◽  
Thermal Management ◽  
Metal Hydride ◽  
Vapor Deposition ◽  
Porous Electrode ◽  
Cellular Structures ◽  
Nickel Metal ◽  
Nickel Metal Hydride ◽  
Load Bearing ◽  
Directed Vapor Deposition

ABSTRACTMultifunctional structures are those that combine load bearing support in addition to supplemental functions such as actuation, electrochemical energy storage or thermal management. Electron beam - directed vapor deposition (EB- DVD) technology has been used for the deposition of templated cellular structures for micro heat-pipe structures and porous electrode coatings for rechargeable nickel - metal hydride cells. In addition to load bearing support, the tem- plated cellular structures exhibit enhanced thermal management characteristics and the electrochemical cells can be integrated into the load bearing supports of linear and truss based structures leading to their multifunctionality. Dur- ing EB-DVD, the electron beam evaporated vapor flux is encompassed by a rarefied transonic inert gas jet, entraining the vapor in a non-reactive gas flow and transporting it onto a polymer or metal template structure. Here, EB-DVD technology has been used to synthesize copper based templated cellular structures for thermal management systems and porous nickel coatings for the positive electrode of rechargeable nickel - metal hydride cells.

Synthesis by plasma-enhanced chemical-vapor deposition and characterization of siliconlike films with hydrophobic functionalities for improved long-term geometric stability of fiber-reinforced polymers

2008 ◽  
Vol 23 (4) ◽  
pp. 1042-1050 ◽  
Author(s):  
A. Cremona ◽  
E. Vassallo ◽  
A. Merlo ◽  
A. Srikantha Phani ◽  
L. Laguardia
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
High Strength ◽  
Scratch Resistance ◽  
Fiber Reinforced Polymers ◽  
Fiber Reinforced ◽  
Water Contact ◽  
Fiber Failure

Amorphous siliconlike films with hydrophobic functionalities have been deposited by plasma-enhanced chemical-vapor deposition on carbon-fiber-reinforced polymer (CFRP) unidirectional laminates used for micromechanical applications where high strength-to-weight and high stiffness-to-weight ratios are required. To improve long-term geometrical stability in ultrahigh-precision machine structures, hydrophobic CFRP materials are desirable. Three layers have been grown with different plasma-process parameters from a mixture of hexamethyldisiloxane, O2, and Ar. Chemical composition, water contact angle, surface energy, morphology, and tribological properties have been evaluated to choose the one that best fulfills hydrophobicity, wear, and scratch resistance. Wear tests have also been carried out on CFRP laminates coated with a polyurethane layer to compare the wear performance of the above specimens with that of a conventional hydrophobic coating. Scanning electron microscope images show a very good adhesion of the films to the composite substrate because the failure of the film and of the substrate (such as fiber failure) take place simultaneously.

Ni-Coated Optical Fibers by Electroless Plating

2000 ◽  
Vol 6 (S2) ◽  
pp. 456-457
Author(s):  
Yuli Lin ◽  
Li-Jang Hwang
Keyword(s):  
Optical Fibers ◽  
Vapor Deposition ◽  
Nuclear Power ◽  
Power Plants ◽  
Linear Expansion ◽  
Chemical Vapor ◽  
High Strength ◽  
Metal Coating ◽  
Chemical Plants ◽  
Silica Substrate

Optical fibers have been extensively employed in a variety of fields. However, the need of high strength, excellent resistance to moisture permeation and tolerance to heat becomes apparent when such optical fibers are used in nuclear power plants and chemical plants in particular. Plastic coatings as conventional made of optical fibers cables would be replaced by the optical fiber coated with a layer of metal.Several techniques have been applied to make a metal coating for the optical fibers. Dipping method, to pass optical fibers through a bath containing metal melt, was found the simplest. This dipping method, however, suffers from a disadvantage of a generation of a microbent due to the differences of the linear expansion between metal and the silica substrate [1]. Moreover, the control of the thickness was found difficult using the dipping method. Chemical vapor deposition was also used to form the metal coating on optical fibers.

Monte Carlo Modeling of Atom Transport During Directed Vapor Deposition

1996 ◽  
Vol 441 ◽  
Author(s):  
J. F. Groves ◽  
H. N. G. Wadley
Keyword(s):  
Monte Carlo ◽  
Vapor Deposition ◽  
Velocity Vector ◽  
Vapor Transport ◽  
Atomic Vapor ◽  
Collision Model ◽  
Carrier Gas ◽  
Vapor Atom ◽  
The Impact ◽  
Directed Vapor Deposition

AbstractAtomic vapor transport has been investigated in the low vacuum (5 – 100 Pa) supersonic gas jets encountered in directed vapor deposition processes using a combination of Direct Simulation Monte Carlo (DSMC) techniques and a bimolecular collision model. The DSMC code generates the velocity vector, pressure, and temperature field for the carrier gas flow. This data is used as an input to a bimolecular collision model of atomic vapor transport in the flow. In the collision model, calculation of directed momentum loss cross-sections allows the location of carrier gas/vapor atom collisions to be deduced, and the vapor atom velocity vectors for individual vapor atoms to be tracked from source to substrate. For atoms arriving at the substrate, the impact location and velocity vector are obtained, making possible calculation of deposition efficiency, film thickness, adatom energy, and impact angle. These are the key inputs for simulations of resulting film microstructure/morphology evolution. Preliminary results for atomic transport of Cu vapor in supersonic He flows compare favorably with previously reported experimental observations.

Preparation of a Carbon-Containing Pellet with High Strength and High Reactivity by Vapor Deposition of Tar to a Cold-Bonded Pellet

2017 ◽  
Vol 31 (9) ◽  
pp. 8877-8885 ◽  
Author(s):  
Yuuki Mochizuki ◽  
Megumi Nishio ◽  
Naoto Tsubouchi ◽  
Tomohiro Akiyama
Keyword(s):  
Vapor Deposition ◽  
High Strength ◽  
High Reactivity

Directed Vapor Deposition of Amorphous and Polycrystalline Electronic Materials: Nonhydrogenated a‐Si

1995 ◽  
Vol 142 (10) ◽  
pp. L173-L175 ◽  
Author(s):  
J. F. Groves ◽  
S. H. Jones ◽  
T. Globus ◽  
L. M. Hsiung ◽  
H. Wadley
Keyword(s):  
Vapor Deposition ◽  
Electronic Materials ◽  
Directed Vapor Deposition
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