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amorphous carbon

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Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ems.t53730081
EISBN: 978-1-62708-283-9
... Abstract This chapter discusses the composition, properties, and uses of crystalline ceramics, glasses, clay, and concrete mixes. It also discusses the carbon structure of diamond, graphite, fullerenes, and nanotubes. amorphous carbon clay concrete mixes crystalline ceramics diamond...
Image
Published: 01 December 2003
Fig. 21 Specific wear rates of hybrid composites formulated by two structures, sandwich and layer, (composite aramid fiber/carbon fiber polyamide amorphous). AF, aramid fiber; CF, carbon fiber; N, normal; V f , volume fraction; P, parallel. Source: Ref 5 More
Image
Published: 01 June 1983
Figure 2.1 Specific heat as a function of temperature for several types of material. Typical behaviors are illustrated for metals (aluminum, beryllium, and copper), semiconductors (carbon and silicon), an amorphous inorganic (Pyrex glass) ( Corruccini and Gniewek, 1960 ), and for an organic More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ems.t53730099
EISBN: 978-1-62708-283-9
... → | -CH 2 -CH 2 - | n where n is a very large number. This reaction is called an addition reaction. It must be initiated by breaking the double carbon-carbon bond in the ethylene monomer. This may be broken by stimulation of an initiator such as a radical, R − , which produces...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ems.t53730001
EISBN: 978-1-62708-283-9
... and the relative levels of force they produce. It describes the difference between crystalline and noncrystalline or amorphous materials and discusses common crystal structures, including face-centered cubic, body-centered cubic, hexagonal close packed, and diamond cubic. It also describes the structure of sodium...
Series: ASM Technical Books
Publisher: ASM International
Published: 23 January 2020
DOI: 10.31399/asm.tb.stemsem.t56000020
EISBN: 978-1-62708-292-1
... Basic imaging and diffraction with the p-STEM detector are demonstrated in Fig. 3 which shows images of carbon nanotube synthesis byproducts depos- ited on a lacey carbon substrate. A large agglomerate of amorphous carbon is visible in the SE image (Fig. 3a), and faint spots (presumably catalyst...
Series: ASM Technical Books
Publisher: ASM International
Published: 23 January 2020
DOI: 10.31399/asm.tb.stemsem.9781627082921
EISBN: 978-1-62708-292-1
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780028
EISBN: 978-1-62708-281-5
... Submolecular Structure As noted in the preceding article, most engineering plastics are based on organic (carbonbase) polymers, where the carbon atom plays a critical role in developing final properties. Hydrogen, oxygen, nitrogen, fluorine, and chlorine are among the many atoms that are built...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870063
EISBN: 978-1-62708-314-0
... as ablators and as precursors for carbon-carbon (C-C) components. Polyesters, epoxies, bismaleimides, and cyanate esters are all classified as addition-curing polymers, while polyimides and phenolics are condensation-curing systems. The most distinct difference between the two types of reactions...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870573
EISBN: 978-1-62708-314-0
... nitride (Si 3 N 4 ), and alumina are the most commonly used whiskers for ceramic matrix composites. Monofilament silicon carbide fibers are produced by chemical vapor deposition of silicon carbide on a 1.3 mil (33.0 μm) diameter amorphous carbon substrate, resulting in a large 5.5 mil (139.7 μm...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 August 2023
DOI: 10.31399/asm.tb.mdsbktmse.t56070001
EISBN: 978-1-62708-451-2
... laboratory showed that the addition of 0.5 wt% cyclopropane carboxylic acid (CPCa) to a polyalphaolefin (PAO) base oil reduced friction and wear ( Ref 7 ). Reactive MD simulations revealed that CPCa forms a lubricious amorphous carbon structure, or a tribofilm, that reduces friction and wear. Molecular...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780146
EISBN: 978-1-62708-281-5
... with alternate ethylenic groups (–CH=CH–CH=CH–). Hydrogen cyanide is evolved when PAN is heated, and the unsaturated product then forms black graphitelike rings. Cellulose and starch also lose water when heated, and the final product is carbon (char). In all instances, the amorphous degradation processes...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550325
EISBN: 978-1-62708-307-2
...-, or three-dimensional molecules. The mer units of polymers are bonded to one another with strong covalent bonds. Most polymers contain mainly carbon in their backbone structures because of the unique ability of carbon to form extensive, stable covalent bonds. While covalent bonds are stronger than metallic...
Series: ASM Technical Books
Publisher: ASM International
Published: 23 January 2020
DOI: 10.31399/asm.tb.stemsem.t56000001
EISBN: 978-1-62708-292-1
... two ADF images of a sample comprising nine pads of amorphous carbon/platinum. Both images show mass-thickness contrast, and the contrast is curiously reversed in the images. To better understand the reversal, a procedure similar to the one fol- lowed for the polycrystalline aluminum sample can...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870183
EISBN: 978-1-62708-314-0
... be well above the glass transition temperature T g for amorphous resins or above the melt temperature T m for semicrystalline materials. Fig. 6.1 Typical thermoplastic composite process cycle. Source: Ref 1 As a general rule, the processing temperature for an amorphous thermoplastic...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2020
DOI: 10.31399/asm.tb.bpapp.t59290035
EISBN: 978-1-62708-319-5
... of individual repeat units times the number of repeat units. For example, in polyethylene, each CH 2 –CH 2 unit has a mass of 28 g/mol (2 carbons at 12 each and 4 hydrogen at 1 each, so 2 × 12 + 4 × 1 = 28). If the repeat value N = 100, then the molecular weight for the molecule is 2830 g/mol (100 CH 2 –CH 2...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870401
EISBN: 978-1-62708-314-0
... matrix absorbs moisture from the atmosphere, it reduces the glass transition temperature T g in the manner shown for the carbon/epoxy and carbon/bismaleimide composites in Fig. 15.2 . As moisture is absorbed, the temperature at which the matrix changes from a glassy solid to a softer, more viscous...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.tm.t52320001
EISBN: 978-1-62708-357-7
... / Thermodynamics of Microstructures Amorphous carbon Graphite Carbon fiber Diamond Fullerene (a) Matter (b) Materials Fig. 1.1 The distinction between matter (characterized by structure) and materials (charac- terized by microstructure) a1: Single polymers Linear polymers Branched polymers b1: Crystalline polymers...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780003
EISBN: 978-1-62708-281-5
...) near neighbors. The very low CNs of polymers, in addition to the prevalence of light atoms such as carbon and hydrogen as the backbone of most polymers, tends to result in lower density relative to metals and ceramics. The localized nature of electrons in polymers also renders them good electrical...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.tm.9781627083577
EISBN: 978-1-62708-357-7