Design and optimization of multilayer coatings for hard x-ray mirrors

1999 ◽  
Author(s):  
Adrian Ivan ◽  
Ricardo J. Bruni ◽  
Kyung Wha Byun ◽  
Finn E. Christensen ◽  
Paul Gorenstein ◽  
...  
Keyword(s):  
Multilayer Coatings ◽  
X Ray ◽  
Design And Optimization

scholarly journals Estimation of Wear Resistance for Multilayer Coatings Obtained by Nitrogenchroming

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1153
Author(s):  
Ivan Pavlenko ◽  
Jozef Zajac ◽  
Nadiia Kharchenko ◽  
Ján Duplák ◽  
Vitalii Ivanov ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Spectral Analysis ◽  
Friction Coefficient ◽  
Cutting Tools ◽  
Wear Intensity ◽  
Maximum Amount ◽  
Multilayer Coatings ◽  
Wear Depth ◽  
X Ray ◽  
Machine Parts

This article deals with improving the wear resistance of multilayer coatings as a fundamental problem in metal surface treatment, strengthening elements of cutting tools, and ensuring the reliability of machine parts. It aims to evaluate the wear depth for multilayer coatings by the mass loss distribution in layers. The article’s primary purpose is to develop a mathematical method for assessing the value of wear for multilayer steel-based coatings. The study material is a multilayer coating applied to steel DIN C80W1. The research was performed using up-to-date laboratory equipment. Nitrogenchroming has been realized under overpressure in two successive stages: nitriding for 36 h at temperature 540 °C and chromizing during 4 h at temperature 1050 °C. The complex analysis included several options: X-ray phase analysis, local micro-X-ray spectral analysis, durometric analysis, and determination of wear resistance. These analyses showed that after nitrogenchroming, the three-layer protective coating from Cr23C6, Cr7C3, and Cr2N was formed on the steel surface. Spectral analysis indicated that the maximum amount of chromium 92.2% is in the first layer from Cr23C6. The maximum amount of carbon 8.9% characterizes the layer from Cr7C3. Nitrogen is concentrated mainly in the Cr2N layer, and its maximum amount is 9.4%. Additionally, it was determined that the minimum wear is typical for steel DIN C80W1 after nitrogenchroming. The weight loss of steel samples by 25 mg was obtained. This value differs by 3.6% from the results evaluated analytically using the developed mathematical model of wear of multilayer coatings after complex metallization of steel DIN C80W1. As a result, the impact of the loading mode on the wear intensity of steel was established. As the loading time increases, the friction coefficient of the coated samples decreases. Among the studied samples, plates from steel DIN C80W1 have the lowest friction coefficient after nitrogenchroming. Additionally, a linear dependence of the mass losses on the wearing time was obtained for carbide and nitride coatings. Finally, an increase in loading time leads to an increase in the wear intensity of steels after nitrogenchroming. The achieved scientific results are applicable in developing methods of chemical-thermal treatment, improving the wear resistance of multilayer coatings, and strengthening highly loaded machine parts and cutting tools.

Development of R.F. Sputtered Cu / Si Multilayer Coatings for X-Ray Mirror Applications

1999 ◽  
Vol 28 (1) ◽  
pp. 1-13
Author(s):  
D. Bhattacharyya ◽  
N. C. Das ◽  
A. P. Roy ◽  
R. Chitra ◽  
S. Basu
Keyword(s):  
Multilayer Coatings ◽  
X Ray

scholarly journals Lifetime Stability and Microstructure Properties of Cr/B4C X-ray Reflective Multilayer Coatings

2019 ◽  
Vol 19 (1) ◽  
pp. 554-561 ◽  
Author(s):  
Catherine Burcklen ◽  
Regina Soufli ◽  
Jennifer Rebellato ◽  
Christopher Walton ◽  
Evgueni Meltchakov ◽  
...  
Keyword(s):  
Multilayer Coatings ◽  
X Ray

Synthesis and Characterization of New Refractory Coatings Based on Talc, Cordierite, Zircon and Mullite Fillers for Lost Foam Casting Process

2014 ◽  
Vol 59 (1) ◽  
pp. 89-95 ◽  
Author(s):  
A. Prstić ◽  
Z. Aćimović-Pavlović ◽  
A. Terzić ◽  
L. Pavlović
Keyword(s):  
Microstructural Analysis ◽  
Casting Process ◽  
Lost Foam Casting ◽  
X Ray Diffraction ◽  
X Ray ◽  
Software Application ◽  
Design And Optimization ◽  
Refractory Coatings ◽  
Particle Size And Shape ◽  
Lost Foam

Abstract Refractory coatings based on different refractory fillers (talc, cordierite, zircon and mullite) for application in Lost Foam casting process were investigated. Design and optimization of the coatings composition with controlled, rheological properties included, and consequently synthesis were achieved by application of different coating components, namely different suspension agents and fillers and by alteration of the coating production procedure. Morphologic and microstructural analysis of fillers was carried out by means of scanning electronic microscope. X-ray diffraction analysis by means of X-ray diffractometer was applied in determination and monitoring the phase composition changes of the refractory fillers. An analysis of the particle size and shape was carried out by means of the PC software application package OZARIA 2.5. To assess the effects of application of individual refractory coatings, a detailed investigation of structural and mechanical properties of the moldings obtained was performed. Highlight was placed on revealing and analyzing surface and volume defects present on moldings. Radiographic molding tests were carried out by means of the X-ray device SAIFORT type-S200. Attained results are essential for the synthesis of refractory coatings based on high-temperature fillers and their applications in Lost Foam casting process for manufacturing of moldings with in-advance-set properties.

A Hard X-Ray Telescope/Concentrator Design Based on Graded Period Multilayer Coatings

1995 ◽  
pp. 33-46
Author(s):  
F. E. Christensen ◽  
K. D. Joensen ◽  
P. Gorenstein ◽  
W. C. Priedhorsky ◽  
N. J. Westergaard ◽  
...  
Keyword(s):  
Multilayer Coatings ◽  
X Ray

Catalyst-Free Synthesis of Diastereomerically Pure 3-Sulfonyl­azetidin-2-ones via Microwave-Assisted Tandem Wolff Rearrangement–Staudinger Cycloaddition

Synthesis ◽  
2020 ◽  
Author(s):  
Mikhail Krasavin ◽  
Judith Synofzik ◽  
Olga Bakulina ◽  
Olga Balabas ◽  
Dmitry Dar’in
Keyword(s):  
Drug Design ◽  
Single Crystal ◽  
Wolff Rearrangement ◽  
X Ray ◽  
Design And Optimization ◽  
X Ray Crystallography ◽  
Microwave Assisted ◽  
Catalyst Free ◽  
Relative Stereochemistry ◽  
Wide Range

A wide range of α-diazo-β-ketosulfones have been applied to thermally promoted tandem Wolff rearrangement – Staudinger [2+2] cycloaddition with imines to give polysubstituted β-lactam sulfones. Dia­stereomerically pure syn-diastereomers were obtained in good yields and the relative stereochemistry was confirmed by single-crystal X-ray crystallography. These findings significantly expand the scope of this transformation, in contrast to substantial limitations reported previously. Moreover, this methodology enables flexible exploration of new substitution patterns around the privileged β-lactam core for drug design and optimization.

Ultra-short-period WC/SiC multilayer coatings for x-ray applications

2013 ◽  
Vol 710 ◽  
pp. 114-119 ◽  
Author(s):  
Mónica Fernández-Perea ◽  
Mike J. Pivovaroff ◽  
Regina Soufli ◽  
Jennifer Alameda ◽  
Paul Mirkarimi ◽  
...  
Keyword(s):  
Multilayer Coatings ◽  
X Ray ◽  
Short Period
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