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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
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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
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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...
Abstract
This chapter discusses the structural classifications, molecular configuration, degradation, properties, and uses of polymers. It describes thermoplastic and thermosetting polymers, degree of polymerization, branching, cross-linking, and copolymers. It also discusses glass transition temperatures, additives, and the effect of stretching on thermoplastics.
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...
Abstract
This chapter discusses the foundational principles of materials science. It begins with a review of the periodic table and the fundamental particles, including atoms, ions, and molecules, that constitute matter. It also reviews the types of bonds that form between atoms 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 chloride and includes a list of structurally similar compounds.
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...
Abstract
This chapter discusses the setup and use of a transmission electron detector in a typical scanning electron microscope (SEM). It describes the arrangement and function of the primary components in the detector, following the signal path from the sample to a micromirror array where it is directed by the user to either a CMOS sensor (to record diffraction patterns) or a photomultiplier tube (to observe real-space images). The chapter discusses some of the nuances of digital imaging and diffraction and includes examples in which transmission electron detectors are used to analyze gold films, carbon nanotubes, zeolite sheets, and monolayer graphene. It also describes emerging techniques, including four-dimensional STEM, thermal diffuse scattering, energy filtering, aberration correction, and atomic resolution imaging.
Book
Series: ASM Technical Books
Publisher: ASM International
Published: 23 January 2020
DOI: 10.31399/asm.tb.stemsem.9781627082921
EISBN: 978-1-62708-292-1
Book Chapter
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...
Abstract
This article describes in more detail the fundamental building-block level, atomic, then expands to a discussion of molecular considerations, intermolecular structures, and finally supermolecular issues. An explanation of important thermal, mechanical, and physical properties of engineering plastics and commodity plastics follows, and the final section briefly outlines the most common plastics manufacturing processes.
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...
Abstract
This chapter discusses the use of thermoset and thermoplastic resins in polymer matrix composites. It begins by explaining how the two classes of polymer differ and how it impacts their use as matrix materials. It then goes on to describe the characteristics of polyester, vinyl ester, epoxy, bismaleimide, cyanate ester, polyimide, and phenolic resins and various toughening methods. The chapter also covers thermoplastic matrix materials and product forms and provides an introduction to the physiochemical tests used to characterize resins and cured laminates.
Book Chapter
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...
Abstract
This chapter discusses the types of fibers and matrix materials used in ceramic matrix composites and the role of interfacial coatings. It describes the methods used to produce ceramic composites, including powder processing, slurry infiltration and consolidation, polymer infiltration and pyrolysis, chemical vapor infiltration, directed metal oxidation, and liquid silicon infiltration.
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...
Abstract
This chapter familiarizes readers with the basic theory of molecular dynamics and its application in the study of materials. It explains how material properties and behaviors are determined through the iterative calculation of motion equations for a collection of atoms under a given set of conditions. It also provides a walk-through on the use of LAMMPS, an open-source molecular dynamics simulator, discussing the selections and inputs of relevance to practical materials problems.
Book Chapter
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...
Abstract
This article discusses the chemical susceptibility of a polymeric material. The discussion covers significant absorption and transportation of an environmental reagent by the polymer; the chemical susceptibility of additives; and thermal degradation, thermal oxidative degradation, photo-oxidative degradation, environmental corrosion, and chemical corrosion of polymers. It also includes some of the techniques used to detect changes in structure during polymer exposure to hostile environments. In addition, the article describes the effects of environment on polymer performance, namely plasticization, solvation, swelling, environmental stress cracking, polymer degradation, surface embrittlement, and temperature effects.
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...
Abstract
This chapter describes the molecular structures and chemical reactions associated with the production of thermoset and thermoplastic components. It compares and contrasts the mechanical properties of engineering plastics with those of metals, and explains how fillers and reinforcements affect impact and tensile strength, shrinkage, thermal expansion, and thermal conductivity. It examines the relationship between tensile modulus and temperature, provides thermal property data for selected plastics, and discusses the effect of chemical exposure, operating temperature, and residual stress. The chapter also includes a section on the uses of thermoplastic and thermosetting resins and provides information on fabrication processes and fastening and joining methods.
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...
Abstract
This chapter discusses the principles of scanning transmission electron microscopy (STEM) as implemented using conventional scanning electron microscopes (SEMs). It describes the pros and cons of low-energy imaging and diffraction, addresses basic hardware requirements, and provides information on imaging modes, detector positioning and alignment, and the effect of contrast reversal. It also discusses beam convergence and angular selectivity, the use of application-specific masks, and how to generate grain orientation maps for different material systems.
Book Chapter
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...
Abstract
Generally, binders consist of at least three ingredients: a backbone to provide strength (compounds such as polyethylene, polypropylene, ethylene vinyl acetate, and polystyrene); a filler, such as polyacetal and paraffin wax, to occupy space between particles; and additives, such as stearates, stearic acid, or magnesium stearate, as well as phosphates and sulfonates, to adjust viscosity, lubricate tooling, disperse particles, or induce binder wetting of the powder. In the case of binders deposited via ink jet printing, the binder contains solvents to lower the viscosity for easier jetting. The chapter provides a detailed description of these constituents. The requirements of a binder as well as the factors determining the physical and thermal properties of polymers are discussed. Then, two factors associated with solvation of polymers, namely solubility parameter and wetting, are covered. The chapter ends with information on the specification of polymers used in binders.
Book Chapter
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...
Abstract
This chapter describes the conditions under which environmental degradation is likely to occur in polymer matrix composites and the potential damage it can cause. It discusses the problems associated with moisture absorption and exposure to solvents, fuels, ultraviolet radiation, lightning strikes, thermal oxidation, and extreme temperatures. It also discusses the factors that influence flammability.
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...
Abstract
This chapter explains the distinction between materials and matter through the concept of microstructure. It presents the history of matter science and the establishment of metallography. The chapter provides an overview of the progress of steel technology, progress in synthetic polymers and ceramics, and establishment and development of materials science.
Book Chapter
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...
Abstract
This introductory article describes the various aspects of chemical structure and composition that are important to an understanding of polymer properties and their eventual effect on the end-use performance of engineering plastics, namely thermoplastics and thermosets. The most important properties of polymers and the most significant influences of structure on those properties are covered. The article also includes some general information on the classification and naming of polymers and plastics.
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.tm.9781627083577
EISBN: 978-1-62708-357-7
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