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dielectric materials

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Published: 15 May 2022
Fig. 1 Voltage profiles used in determining the dielectric strength of materials. (a) Short-time test, in which voltage is applied uniformly to test electrodes from zero using one of rates shown below figure until breakdown occurs. (b) Step-by-step test; use list below figure to select More
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006475
EISBN: 978-1-62708-190-0
... Abstract Electromagnetic signals at microwave and millimeter-wave frequencies are well suited for inspecting dielectric materials and composite structures in many critical applications. This article presents a partial list of reported nondestructive testing (NDT) application areas...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003235
EISBN: 978-1-62708-199-3
... covers (radomes). This article focuses on the microwave inspection methods that were subsequently developed for evaluation of moisture content in dielectric materials; thickness measurements of thin metallic coatings on dielectric substrates; and detection of voids, delaminations, macroporosity...
Image
Published: 01 January 1997
Fig. 1 Frequency dependency of dielectric constant for selected dielectric materials More
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002475
EISBN: 978-1-62708-194-8
... ( Ref 7 , 8 ). Properties of the crystalline materials may be direction dependent. As already indicated above, a materials property is often temperature dependent. Fig. 1 Frequency dependency of dielectric constant for selected dielectric materials The Ohm's law equations ( Eq 1 , 2 , 3...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003658
EISBN: 978-1-62708-182-5
... detection is based on the physics of the way in which microwaves interact with the materials of the coating and the sublayers of corrosion. Paint, appliqués, and corrosion byproducts are all dielectric materials, and each influences a microwave signal differently. In addition, the damage caused by corrosion...
Series: ASM Handbook
Volume: 5A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v05a.a0005736
EISBN: 978-1-62708-171-9
... Abstract Thermal spray processes involve complete or partial melting of a feedstock material in a high-temperature flame, and propelling and depositing the material as a coating on a substrate. This article describes the properties of sprayed electronic materials, including dielectrics...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006913
EISBN: 978-1-62708-395-9
.... Electrical Tests In the electrical and electronics industry, the tests explained in the following section are widely used to determine the electrical properties of insulating materials, particularly plastics. Dielectric Breakdown Voltage and Dielectric Strength For materials used in applications...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003026
EISBN: 978-1-62708-200-6
... widely used dielectric (nonconducting) materials in the electrical and electronics industry. There are numerous plastic materials available with a wide variety of electrical, mechanical, and chemical properties. In terms of their electrical properties, plastics can be divided into thermosetting...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003465
EISBN: 978-1-62708-195-5
... in a resin-dominated direction. In fiber-dominated orientations, the superior fiber stiffness controls the composite stiffness and masks the effect of the resin. Dielectric Analysis Dielectric analysis measures dielectric properties of a material as a function of temperature, time, and frequency under...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003049
EISBN: 978-1-62708-200-6
... of any of the advanced ceramics. The ceramic properties that are important for electronic applications result from a variety of mechanisms that depend on the bulk materials, grain boundary properties, and surface effects. Important properties include dielectric constant, dielectric strength...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003062
EISBN: 978-1-62708-200-6
... superconducting devices CERAMIC MATERIALS serve important insulative, capacitive, conductive, resistive, sensor, electrooptic, and magnetic functions in a wide variety of electrical and electronic circuitry. Traditional voltage insulative uses have involved mainly dielectric isolation of conductors...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003435
EISBN: 978-1-62708-195-5
... electromagnetic sensing (FDEMS) NASA-Langley; Virginia Polytechnic Institute and State University; College of William and Mary; U.S. Air Force Materials Directorate; Hughes Similar to dielectric Fluorescence National Institute of Standards and Technology (NIST); Johns Hopkins University; McDonnell Douglas...
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002165
EISBN: 978-1-62708-188-7
... martensite. A single-phase alloy or precipitation-hardening alloy would have a different behavior. Small amounts of electrode material as well as carbon from the dielectric can be deposited on the EDM surface. In the case of steel, extra carbon in the surface layer can cause more martensite...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003007
EISBN: 978-1-62708-200-6
... the plastic part surface Dielectric properties Dielectric strength A measure of resistance to electrical breakdown with exposure to high voltage Dielectric constant A measure of electrical energy stored in a dielectric material Dielectric loss factor A measure of energy lost in an insulating...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003001
EISBN: 978-1-62708-200-6
... Abstract This article is a collection of tables that present information on the physical properties of periodic table elements, and maximum service temperatures, dielectric constants and typical dielectric properties of selected nonmetallic materials. dielectric constants dielectric...
Image
Published: 01 November 1995
Fig. 6 Propagation delay as a function of dielectric constant for different substrate materials. Source: Ref 16 More
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002166
EISBN: 978-1-62708-188-7
... grinding depends on current density, tool material, work material, and dielectric fluid. Volume-wear ratio (ratio of work volume removed to wheel volume removed) can range from 100:1 to 0.1:1. The average volume-wear ratio is about 3:1. Wheel wear, however, is spread over the entire periphery...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004175
EISBN: 978-1-62708-184-9
... difference between the terminals of a capacitor with tin terminations resulted in the migration of tin from the anode toward the cathode across the dielectric material (gray area) between the tin terminations (bright areas) in the left side of Fig. 4 . The right side of Fig. 4 shows a higher magnification...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005158
EISBN: 978-1-62708-186-3
... electrode and workpiece. The sparks travel through a dielectric fluid (typically a light oil) at a controlled distance. Both electrode and work must be electrically conductive. The EDM process has several advantages when machining difficult geometries or materials with poor machinability. Cavities with thin...