Topic
Carbide
About: Carbide is a research topic. Over the lifetime, 36331 publications have been published within this topic receiving 503586 citations.
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13 Nov 2013TL;DR: In this paper, the methods of forming carbon films, structures and devices including the carbon films and systems for forming the carbon film are disclosed. But they do not discuss how to obtain a uniform thickness over a substrate.
Abstract: Methods of forming carbon films, structures and devices including the carbon films, and systems for forming the carbon films are disclosed. A method includes depositing a metal carbide film using atomic layer deposition (ALD). Metal from the metal carbide film is removed from the metal carbide film to form a carbon film. Because the films are formed using ALD, the films can be relatively conformal and can have relatively uniform thickness over the surface of a substrate.
149 citations
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TL;DR: It is concluded that titanium carbide forms during a short (approximately 100 years) phase of catastrophic mass loss in dying, low-mass stars.
Abstract: Meteorites contain micrometer-sized graphite grains with embedded titanium carbide grains Although isotopic analysis identifies asymptotic giant branch stars as the birth sites of these grains, there is no direct observational identification of these grains in astronomical sources We report that infrared wavelength spectra of gas-phase titanium carbide nanocrystals derived in the laboratory show a prominent feature at a wavelength of 201 micrometers, which compares well to a similar feature in observed spectra of postasymptotic giant branch stars It is concluded that titanium carbide forms during a short (approximately 100 years) phase of catastrophic mass loss (>0001 solar masses per year) in dying, low-mass stars
148 citations
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TL;DR: In this article, the effect of niobium element on the as-cast microstructure of the hypereutectic high chromium cast irons containing 4.0 and 20.0% Cr was studied.
148 citations
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TL;DR: The microstructure and crystallography of carbides in 30.3%C cast irons with up to 3.7wt.%V additions have been studied by scanning electron microscopy and transmission electron microscope as mentioned in this paper.
148 citations
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01 Jul 1988-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, a study of the mechanistic role of silicon carbide (SiC) particles during fatigue crack propagation in powder metallurgy Al-Zn-Mg-Cu metal matrix composites reinforced with 20 vol.% SiC particulates, with varying sizes of reinforcement phase, was made.
Abstract: A study has been made of the mechanistic role of silicon carbide (SiC) particles during fatigue crack propagation in powder metallurgy AlZnMgCu metal matrix composites reinforced with 20 vol.% SiC particulates (SiC p ), with varying sizes of reinforcement phase. Crack growth and accompanying crack tip shielding (principally by crack deflection, closure and bridging) are examined in peak-aged alloys over a wide spectrum of growth rates from 10 −12 to 10 −4 m cycle −1 and are compared with corresponding behavior in the unreinforced matrix alloy. Crack growth resistance in the composites is found to be both superior and inferior to that of the unreinforced alloy, depending on how the SiC and SiC-matrix interface fracture. At low stress intensity ranges ΔK, the predominant fracture of carbides close to the crack tip results in low levels of crack closure and rapid growth kinetics for fine SiC p distributions, whereas for coarse SiC p distributions the rougher fracture surface promotes crack closure from asperity wedging and improved crack growth resistance. With increasing ΔK, the fracture of large carbides farther ahead of the crack tip leads to the development of non-uniform crack fronts, thereby promoting crack bridging via uncracked ligaments and a small improvement in crack growth resistance. At high ΔK levels approaching K Ic , growth rates are faster in the composites owing to their low toughness. On the basis of these results, the overall fatigue crack growth performance of the SiC p Al composites compared with that of the traditional monolithic aluminum alloys is briefly discussed.
148 citations