A Mixed Ceramic-Metal Sphere-Pac Concept

Complex impedance spectra of ferroelectric mixed ceramic system ( Na 0.5 Bi 0.5)1-x Ca x Bi 4 Ti 4 O 15 with x=0, 0.1, 0.3, 0.5, 0.7 and 1 was studied as a function of frequency and temperature in the range 1 KHz to 10 MHz and 30°C to 620°C respectively. Equivalent circuits involving resistive and capacitive elements at different temperatures, activation energies of relaxations and conduction were evaluated using impedance plots. A comparative study of impedance and conductivity facilities an insight in understanding the electrical nature of these electroceramics.

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Capacitance of Metal Sphere with Concentric Multilayered Dielectric Coating

IETE Journal of Research ◽

10.1080/03772063.1999.11416085 ◽

1999 ◽

Vol 45 (2) ◽

pp. 147-150

Author(s):

B N Das

Keyword(s):

Dielectric Coating ◽

Metal Sphere

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Inelastic scattering of slow electrons by molecules adsorbed on a small metal sphere

Surface Science ◽

10.1016/0039-6028(82)90273-4 ◽

1982 ◽

Vol 120 (1) ◽

pp. 38-46 ◽

Cited By ~ 5

Author(s):

W. Ekardt ◽

D.B. Tran Thoai

Keyword(s):

Inelastic Scattering ◽

Metal Sphere ◽

Slow Electrons

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II. On the alleged slipping at the boundary of a liquid in motion

Proceedings of the Royal Society of London ◽

10.1098/rspl.1890.0032 ◽

1891 ◽

Vol 48 (292-295) ◽

pp. 225-230 ◽

Cited By ~ 6

Keyword(s):

Copper Surface ◽

Distilled Water ◽

Metal Sphere

The experiments of Helmholtz and Piotrowski on the oscillations of a metal sphere suspended bifilarly, and filled with various liquids, gave finite values to the slipping coefficients. The inside of the sphere was gilded and polished, and the value obtained for the coefficient λ was, in the case of distilled water, 2·3534 mm. From some experiments of Girard on transpiration through copper tubes, Helmholtz deduces the value λ = 0·3984 mm. for water flowing past a copper surface.

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A multivariate robust parameter design approach for optimization of AISI 52100 hardened steel turning with wiper mixed ceramic tool

International Journal of Refractory Metals and Hard Materials ◽

10.1016/j.ijrmhm.2011.08.001 ◽

2012 ◽

Vol 30 (1) ◽

pp. 152-163 ◽

Cited By ~ 33

Author(s):

A.P. Paiva ◽

P.H. Campos ◽

J.R. Ferreira ◽

L.G.D. Lopes ◽

E.J. Paiva ◽

...

Keyword(s):

Hardened Steel ◽

Design Approach ◽

Parameter Design ◽

Robust Parameter Design ◽

Ceramic Tool ◽

Aisi 52100 ◽

Robust Parameter ◽

Steel Turning ◽

Mixed Ceramic

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Effect of Workpiece Hardness on Surface Microgeometry when Hard Turning with Ceramic Inserts

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.581.176 ◽

2013 ◽

Vol 581 ◽

pp. 176-181 ◽

Cited By ~ 1

Author(s):

Ildikó Maňková ◽

Jozef Beňo ◽

Marek Vrabel'

Keyword(s):

Surface Roughness ◽

Hard Turning ◽

Surface Profile ◽

Surface Finishing ◽

Oxide Ceramic ◽

Part Surface ◽

Cutting Force Components ◽

Finish Hard Turning ◽

Force Components ◽

Mixed Ceramic

Hard turning provides an alternative to grinding in some finishing operations. This paper deals with analysis of part surface finishing when turning hardened steel heat-treated on hardness of 46, 55 and 60 HRC with mixed oxide ceramic inserts. Average surface roughness Ra has been widely used in industry it is known that the single parameter Ra is inadequate to define the functionality of a surface. Two different surfaces with similar values of Ra can behave differently under loading conditions. The surface profile 2D and 3D parameters are assessed. The influence of workpiece hardness on surface roughness parameters and cutting force components is investigated. Results show that finish hard turning with mixed ceramic tool produces surface profile comparable to those produced by grinding.

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