Ductile Tantalum Oxide Protective Coatings

1984 ◽  
Vol 40 ◽  
Author(s):  
Hani L. Rizkalla ◽  
Stephen T. Wellinghoff
Keyword(s):  
Electron Beam ◽  
Tensile Strain ◽  
Protective Coatings ◽  
Tantalum Oxide ◽  
Atomic Motion ◽  
Polymer Substrates ◽  
Dynamic Mechanical ◽  
The Face ◽  
Mechanical Spectra ◽  
Similar Dynamic

AbstractAmorphous, anodic Ta2O5 films of 400 A thickness deposited on deformable polymer substrates deformed by microshear banding even at 5–10% tensile strain. Electron beam evaporated Ta2O5 (EBE) were considerably more brittle in tension on the same substrates, fracturing at strains less than 1%. Even though both films were amorphous to electron diffraction the EBE vibrational spectrum in the Ta2O5 region (900 cm-1 - 400 cm-1) was more reminiscent of thermally oxidized material that appears to have greater microstructural order. A significant dynamic mechanical peak was observed at 60–90°C for both Al and Ta foils coated with either anodic or EBE Ta2O5 films. This process was assigned to relaxation of interfacial stresses induced by atomic motion in the oxide in this temperature range. In the face of the rather similar dynamic mechanical spectra we suspect that the presence of a greater Packing heterogeneity might explain the greater brittleness of the EBE films.

Gradient structures of Ni – Zn ferrites for electromagnetic radiation protection devices

2021 ◽  
Vol 5 ◽  
pp. 39-46
Author(s):  
V. V. Karanskij ◽  
◽  
S. V. Smirnov ◽  
A. S. Klimov ◽  
E. V. Savruk ◽  
...  
Keyword(s):  
Electron Beam ◽  
Electromagnetic Radiation ◽  
Radiation Protection ◽  
Electromagnetic Compatibility ◽  
Protective Coatings ◽  
Frequency Range ◽  
Near Surface ◽  
Zn Ferrite ◽  
Absorbing Materials ◽  
Plasma Electronic

Increasing the reliability requirements for electromagnetic compatibility of electronic equipment requires the creation of protective coatings that absorb electromagnetic radiation or the development of new radio-absorbing materials. In the frequency range up to 1 GHz, radio-absorbing materials based on Ni – Zn ferrites are of the greatest interest. The absorption of electromagnetic radiation by ferrites occurs due to resonant phenomena at the level of domains and atoms. Improving the performance of ferrites is possible by modifying their surface properties. In this paper, gradient structures for electromagnetic radiation protection products are obtained by treating the surface of Ni – Zn ferrite samples with a low-energy electron beam. To generate the electron beam, a unique development was used — a forevacuum plasma electronic source that allows forming and transporting a beam with a power density of up to 105 W/cm2 under conditions of high pressure and high gas release. As a result of processing, gradient structures were found on the surface of ferrites. A theoretical analysis and experimental study of the obtained structures “non – magnetic conductor – ferrite”, characterized by an increased attenuation coefficient and a reduced reflection coefficient of electromagnetic radiation in the frequency range from 0.5 to 2.5 GHz. The possibility of obtaining near-surface layers depleted in zinc with increased electrical conductivity and reduced magnetic permeability is shown.

The origin of a new transition in dynamic mechanical spectra of multilayer polymeric composite

Polymer ◽  
2012 ◽  
Vol 53 (12) ◽  
pp. 2519-2523 ◽  
Author(s):  
Jiabin Shen ◽  
Jiang Li ◽  
Shaoyun Guo
Keyword(s):  
Polymeric Composite ◽  
Dynamic Mechanical ◽  
Mechanical Spectra

scholarly journals Tantalum oxide thin films as protective coatings for sensors

1999 ◽  
Vol 9 (2) ◽  
pp. 113-118 ◽  
Author(s):  
Carsten Christensen ◽  
Roger de Reus ◽  
Siebe Bouwstra
Keyword(s):  
Thin Films ◽  
Protective Coatings ◽  
Tantalum Oxide ◽  
Oxide Thin Films

scholarly journals Deposition of SiOxCyHz Protective Coatings on Polymer Substrates in an Industrial-Scale PECVD Reactor

Coatings ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 234 ◽  
Author(s):  
Žiga Gosar ◽  
Janez Kovač ◽  
Miran Mozetič ◽  
Gregor Primc ◽  
Alenka Vesel ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Protective Coating ◽  
Photoelectron Spectroscopy ◽  
Secondary Ion Mass Spectrometry ◽  
Protective Coatings ◽  
Plasma Reactor ◽  
Chemical Vapour ◽  
Rf Discharge ◽  
Average Roughness ◽  
Polymer Substrates

The deposition of protective coatings on aluminised polymer substrates by a plasma enhanced chemical vapour deposition PECVD technique in a plasma reactor with a volume of 5 m3 was studied. HMDSO was used as a precursor. Plasma was sustained in a capacitively coupled radiofrequency (RF) discharge powered by an RF generator operating at 40 kHz and having an adjustable output power up to 8 kW. Gaseous plasma was characterised by residual gas mass spectrometry and optical emission spectroscopy. Polymer samples with an average roughness of approximately 5 nm were mounted into the plasma reactor and subjected to a protocol for activation, metallisation and deposition of the protective coating. After depositing the protective coating, the samples were characterised by secondary ion mass spectrometry (SIMS) and X-ray photoelectron spectroscopy (XPS). The combination of various techniques for plasma and coating characterisation provided insight into the complex gas-phase and surface reactions upon deposition of the protective coatings in the industrial-size plasma reactor.

Industrial Electron-Beam Equipment for Deposition of Protective Coatings: Overview

2019 ◽  
Vol 58 (1-2) ◽  
pp. 113-124
Author(s):  
D. Siaosiu ◽  
M. I. Hrechaniuk ◽  
P. P. Kucherenko ◽  
A. G. Melnik ◽  
I. M. Hrechaniuk ◽  
...  
Keyword(s):  
Electron Beam ◽  
Protective Coatings
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