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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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TL;DR: In this paper, an experimental investigation was carried out on the Al-C-Si ternary system under atmospheric pressure and at temperatures up to 1900 K. From the results obtained, a thermodynamic model based on stable and metastable phase equilibria was set up in order to provide a general description of the chemical interaction between aluminium and SiC.
Abstract: An experimental investigation was carried out on the Al-C-Si ternary system under atmospheric pressure and at temperatures up to 1900 K. From the results obtained, a thermodynamic model based on stable and metastable phase equilibria in the Al-C-Si ternary system was set up in order to provide a general description of the chemical interaction between aluminium and SiC. According to this model, aluminium and SiC are in thermodynamic equilibrium at every temperature lower than 923 K. At 923±3 K, i.e. at 10 K below the melting point of pure aluminium, a quasiperitectic invariant transformation occurs in the Al-C-Si system. In this transformation, solid aluminium reacts with SiC to give Al4C3 and a ternary (Al-C-Si) liquid phase. The carbon content of this liquid phase is very low; its silicon content is 1.5±0.4 at%. From 923 to about 1620 K, aluminium partially reacts with an excess of SiC, leading to a metastable monovariant equilibrium involving SiC, Al4C3 and an aluminium-rich (Al-C-Si) ternary liquid phase, L. The carbon content of this liquid phase, L, remains very low whereas its silicon content increases with temperature from 1.5±0.4 at% at 923 K to 16.5±1 at% at 1620 K. In the temperature range 1670 to 1900 K, two other three-phased monovariant equilibria can be reached by reacting aluminium and SiC. These equilibria involve on the one hand SiC, Al4SiC4 and a liquid phase, L′, and on the other hand, Al4SiC4, Al4C3 and a liquid phase, L″. The former is a stable equilibrium, the latter is a metastable one. At temperatures higher than about 2200 K, the latter metastable equilibrium is replaced by two monovariant stable phase equilibria including the ternary carbide Al8SiC7.

234 citations

Patent
Munkyu Joo1, Minsoo Kang2, Jeamin Moon1, Yun Hye Hahm1, Seongsu Jang1, Jina You1, Jaein Lee1 
27 Feb 2013
TL;DR: An organic light-emitting diode comprising a first (102) and second barrier coating (110), wherein the barrier coating is selected from (i) amorphous silicon carbide, (ii) an ammorphous silicon carbonide alloy comprising at least one element selected from F, N, B, and P, (iii) hydrogenated silicon oxycarbide, and (iv) a coating prepared by (a) curing a hydrogen silsesquioxane resin with an electron beam or (b) reacting a hydrogen-silioxane resin using a chemical vapor
Abstract: An organic light-emitting diode comprising a first (102) and second barrier coating (110),wherein the barrier coating is selected from (i) amorphous silicon carbide, (ii) an amorphous silicon carbide alloy comprising at least one element selected from F, N, B, and P, (iii) hydrogenated silicon oxycarbide, (iv) a coating prepared by (a) curing a hydrogen silsesquioxane resin with an electron beam or (b) reacting a hydrogen silsesquioxane resin using a chemical vapor deposition process; and (v) a mutilayer combination of at least two of (i), (ii), (iii), and (iv).

234 citations

Journal ArticleDOI
TL;DR: In this paper, the phase transformations in two types of catalysts, a model supported catalyst with a nonporous silica support and a precipitated catalyst with no support, were investigated under identical CO-TPR conditions.

229 citations

Journal ArticleDOI
TL;DR: In this paper, high surface area carbides are shown to be promising candidates for development as commercial water-gas shift catalysts for a synthetic steam reformer exhaust stream, and they were shown to have a higher surface area than a commercial Cu-Zn-Al shift catalyst under the conditions employed.
Abstract: Molybdenum carbide (Mo2C) was demonstrated to be highly active for the water–gas shift of a synthetic steam reformer exhaust stream. This catalyst was more active than a commercial Cu–Zn–Al shift catalyst under the conditions employed (220–295°C and atmospheric pressure). In addition, Mo2C did not catalyze the methanation reaction. There was no apparent deactivation or modification of the structure during 48 h on‐stream. The results suggest that high surface area carbides are promising candidates for development as commercial water–gas shift catalysts.

229 citations

Journal ArticleDOI
TL;DR: In this paper, a wide range of magnetic iron-doped molybdenum carbide (Mo2-xFexC) nanomaterials were synthesized by a unique amine-metal oxide composite method.
Abstract: Molybdenum-based materials have been widely investigated recently as promising alternatives to platinum for catalyzing the hydrogen evolution reaction (HER). Molybdenum carbide is one of the most studied transition-metal carbides because of its cheap price, high abundance, good conductivity, and catalytic activity. In order to further improve the catalytic activity of molybdenum carbide, some modifications have been applied. In this paper, a wide range of magnetic iron-doped molybdenum carbide (Mo2–xFexC) nanomaterials were synthesized by a unique amine–metal oxide composite method. The amount of iron dopants was controlled by setting different iron/molybdenum ratios in the precursors. Iron-doped molybdenum carbide nanomaterials were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy-dispersive spectroscopy, Raman microscopy, and X-ray photoelectron spectroscopy. Electrocatalytic HER tests were used to demonstrate the catalytic activity upon addition ...

228 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231,218
20222,462
2021994
20201,277
20191,413
20181,471