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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, it was shown that the added titanium did not act as an inoculant to reduce the size of coarse primary carbides, but instead, as the titanium amount was increased, the cast iron changed from a hypereutectic microstructure to a hypoeutective one due to the depletion of carbon that was consumed by Ti to form titanium carbides.
120 citations
TL;DR: In this article, it was shown that carbon is the light element in the core of Earth's core and that a high-pressure phase of iron carbide modifies iron's elastic properties under inner core conditions.
Abstract: Earth’s core exhibits similar elastic properties to rubber. Experiments show that a high-pressure phase of iron carbide modifies iron’s elastic properties under inner-core conditions, suggesting that carbon is the light element in the core.
120 citations
15 Dec 2002-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the authors used high-resolution electron microscopy (HREM) and TEM and X-ray microanalysis on thin foils and carbon extraction replicas used for analysing the structure and metallic compounds of these precipitates.
Abstract: Microstructures developed in commercial 15-5 PH precipitation-hardened stainless steel after different heat treatments have been studied. In the as received condition, two types of carbides, NbC and M 7 C 3 , were present. Age hardening involves initial formation of fine precipitates rich in copper. Conventional transmission electron microscopy (TEM) and high resolution electron microscopy (HREM) studies have revealed the formation of a 9R structure copper precipitates (4 nm) in the samples aged at temperatures below 500 °C. However, at higher temperatures, in addition to the formation of these precipitates, the austenite phase was formed. After ageing at 500 °C for 128 h, M 23 C 6 carbides were observed. The majority of the M 23 C 6 carbides were in the interface of martensitic matrix and retained austenite. A second type of copper precipitate being, spherical in shape, were observed on ageing at 650 °C. TEM and X-ray microanalysis on thin foils and on carbon extraction replicas used for analysing the structure and metallic compounds of these precipitates. The mechanical properties following strain deformation has been carried out using scanning electron microscope (SEM), TEM and HREM. At peak aged, the 15-5 PH alloy exhibit brittle failure, the major fracture mode was cleavage and/or quasicleavage.
120 citations
TL;DR: In this paper, the authors investigated the hydrotreatment of liquefied lignocellulosic biomass at 300°C under the total pressure of 8MPa in a slurry reactor over unsupported molybdenum (disulphide, dioxide, carbide and carbide) and tungsten catalysts.
Abstract: Hydrotreatment of liquefied lignocellulosic biomass was investigated at 300 °C under the total pressure of 8 MPa in a slurry reactor over unsupported molybdenum (disulphide, dioxide and carbide) and tungsten (disulphide) catalysts. Novel nanostructured urchin-like MoS2 and inorganic-fullerene MoS2 interconnected with carbon materials were synthetized and tested, while the influence of metal variation and the sulphide replacement with carbide or oxide was also investigated by using commercially available MoS2, Mo2C, MoO2 and WS2. Catalysts were structurally characterised by field-emission scanning (SEM) and high-resolution transmission (HRTEM) electron microscopies, energy-dispersive X-ray (EDX) and Raman spectroscopies, as well as X-ray diffraction (XRD). The hydrodeoxygenation (HDO), decarbonylation, decarboxylation and hydrocracking kinetics of depolymerised cellulose, hemicellulose and lignin were determined according to the transformation of their functional groups in liquid phase, and the corresponding gaseous products by an innovative lumped kinetic model based on Fourier transform infrared spectroscopy. Unsupported MoS2 catalysts showed high hydrogenolysis selectivity, the morphology clearly affecting its rate. A high HDO activity reflected in the mass balance and phase distribution of the upgraded liquid product by reducing tar residue and increasing the yield of oil phase with the gross calorific value of 38 MJ kg−1 and oxygen content below 8.5 wt%.
120 citations
TL;DR: The NiSe2-CoSe2@C/Ti3C2Tx composites were prepared through a facile hydrothermal treatment and selenization reaction as mentioned in this paper.
120 citations