Effective permittivity of a medium with stratified dielectric host and metallic inclusions

2004 ◽  
Author(s):  
M.G. Silveirinha ◽  
C.A. Fernandes
Keyword(s):  
Effective Permittivity ◽  
Metallic Inclusions ◽  
Dielectric Host

Analysis of the polarizability of an array of spherical metallic inclusions in a dielectric host sphere

2014 ◽  
Vol 31 (11) ◽  
pp. 2409 ◽  
Author(s):  
Fabio Mangini ◽  
Nicola Tedeschi ◽  
Fabrizio Frezza ◽  
Ari Sihvola
Keyword(s):  
Metallic Inclusions ◽  
Dielectric Host

scholarly journals Studies of permittivity and permeability of dielectric matrix with cuboid metallic inclusions in different orientations

2014 ◽  
Vol 04 (04) ◽  
pp. 1450032 ◽  
Author(s):  
W. M. Wu ◽  
C. C. Njoku ◽  
W. G. Whittow ◽  
A. M. Zagoskin ◽  
F. V. Kusmartsev ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Magnetic Permeability ◽  
Effective Permittivity ◽  
Dielectric Substrate ◽  
Induced Current ◽  
Metallic Inclusion ◽  
Metallic Inclusions ◽  
Permittivity And Permeability ◽  
Effective Magnetic Permeability ◽  
Relevant Range

In this paper, we investigate the possibility of using the heterogeneous materials, with cuboid metallic inclusions inside a dielectric substrate (host) to control the effective permittivity. We find that in the gigahertz range, such a material demonstrates a significantly larger permittivity compared to the pure dielectric substrate. Three principal orientations of microscale cuboid inclusions have been taken into account in this study. The highest permittivity is observed when the orientation provides the largest polarization (electric dipole moment). The detrimental side effect of the metallic inclusion, which leads to the decrease of the effective magnetic permeability, can be suppressed by the proper choice of shape and orientation of the inclusions. This choice can in fact reduce the induced current and hence maximize the permeability. The dissipative losses are shown to be negligible in the relevant range of frequencies and cuboid dimensions.

RESEARCH ON THE NON-METALLIC INCLUSIONS OF KILLED STEEL (I)

1956 ◽  
Vol 42 (10) ◽  
pp. 962-968
Author(s):  
Yosaku Koike ◽  
Sahei Noda
Keyword(s):  
Metallic Inclusions

Determination of non-metallic inclusions in metal alloys by spark atomic emission spectrometry (review)

2018 ◽  
Vol 84 (12) ◽  
pp. 5-19
Author(s):  
D. N. Bock ◽  
V. A. Labusov
Keyword(s):  
Spectral Line ◽  
Internal Standard ◽  
Detection Limits ◽  
Radiation Detectors ◽  
Metal Alloys ◽  
Emission Spectrometry ◽  
Direct Production ◽  
Metallic Inclusions ◽  
Dissolved Form

A review of publications regarding detection of non-metallic inclusions in metal alloys using optical emission spectrometry with single-spark spectrum registration is presented. The main advantage of the method - an extremely short time of measurement (~1 min) – makes it useful for the purposes of direct production control. A spark-induced impact on a non-metallic inclusion results in a sharp increase (flashes) in the intensities of spectral lines of the elements that comprise the inclusion because their content in the metal matrix is usually rather small. The intensity distribution of the spectral line of the element obtained from several thousand of single-spark spectra consists of two parts: i) the Gaussian function corresponding to the content of the element in a dissolved form, and ii) an asymmetric additive in the region of high intensity values ??attributed to inclusions. Their quantitative determination is based on the assumption that the intensity of the spectral line in the single-spark spectrum is proportional to the content of the element in the matter ablated by the spark. Thus, according to the calibration dependence constructed using samples with a certified total element content, it is possible not only to determine the proportions of the dissolved and undissolved element, but also the dimensions of the individual inclusions. However, determination of the sizes is limited to a range of 1 – 20 µm. Moreover, only Al-containing inclusions can be determined quantitatively nowadays. Difficulties occur both with elements hardly dissolved in steels (O, Ca, Mg, S), and with the elements which exhibit rather high content in the dissolved form (Si, Mn). It is also still impossible to determine carbides and nitrides in steels using C and N lines. The use of time-resolved spectrometry can reduce the detection limits for inclusions containing Si and, possibly, Mn. The use of the internal standard in determination of the inclusions can also lower the detection limits, but may distort the results. Substitution of photomultipliers by solid-state linear radiation detectors provided development of more reliable internal standard, based on the background value in the vicinity of the spectral line. Verification of the results is difficult in the lack of standard samples of composition of the inclusions. Future studies can expand the range of inclusions to be determined by this method.

Analysis of the Crack Initiation at Non-Metallic Inclusions in High-Strength Steels

2012 ◽  
Vol 49 (8) ◽  
pp. 468-479 ◽  
Author(s):  
P. Grad ◽  
B. Reuscher ◽  
A. Brodyanski ◽  
M. Kopnarski ◽  
E. Kerscher
Keyword(s):  
Crack Initiation ◽  
High Strength Steels ◽  
High Strength ◽  
Metallic Inclusions

TYPE 316L-SCQ STAINLESS

Alloy Digest ◽  
1995 ◽  
Vol 44 (3) ◽  
Keyword(s):  
Stainless Steel ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Aisi Type ◽  
Metallic Inclusions ◽  
Type 316L ◽  
Technology Corporation ◽  
Carpenter Technology Corporation

Abstract TYPE 316L-SCQ stainless steel is a cleaner version of AISI Type 316L. The clean microstructure, a reduction in the frequency and severity of non-metallic inclusions, allows a better electroplated surface. The unique applications considered for this microstructurally clean alloy include the semiconductor market to maintain gas purity. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on heat treating, machining, and joining. Filing Code: SS-587. Producer or source: Carpenter Technology Corporation.

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