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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TL;DR: A facile wet-chemical route for the synthesis of Hägg iron carbide nanoparticles, in which bromide was found to be the key inducing agent for the conversion of Fe(CO)(5) to Fe(5)C(2) in the synthetic process, showing enhanced catalytic performance in terms of CO conversion and product selectivity.
Abstract: Iron carbide nanoparticles have long been considered to have great potential in new energy conversion, nanomagnets, and nanomedicines. However, the conventional relatively harsh synthetic conditions of iron carbide hindered its wide applications. In this article, we present a facile wet-chemical route for the synthesis of Hagg iron carbide (Fe5C2) nanoparticles, in which bromide was found to be the key inducing agent for the conversion of Fe(CO)5 to Fe5C2 in the synthetic process. Furthermore, the as-synthesized Fe5C2 nanoparticles were applied in the Fischer–Tropsch synthesis (FTS) and exhibited intrinsic catalytic activity in FTS, demonstrating that Fe5C2 is an active phase for FTS. Compared with a conventional reduced-hematite catalyst, the Fe5C2 nanoparticles showed enhanced catalytic performance in terms of CO conversion and product selectivity.
496 citations
TL;DR: Cemented carbides cover a wide range of applications in many relevant industries, such as cutting tools (turning, milling, drilling) for machining of metal components in the automotive and/or aerospace industry, as components of drill bits or road headers in the rock tools and mining area or as wear parts in wire drawing dies or punch tools.
Abstract: Cemented carbides cover a wide range of applications in many relevant industries, i.e. as cutting tools (turning, milling, drilling) for machining of metal components in the automotive and/or aerospace industry, as components of drill bits or road headers in the rock tools and mining area or as wear parts in wire drawing dies or punch tools. In this review selected cemented carbide and cermet microstructures are presented. The focus is on microstructures, both those that are already established in the cemented carbide industry and those which have drawn scientific attention due to new potential applications. Cemented carbides are here divided in four groups based on microstructure and chemistry: WC morphology and chemistry, cubic carbide containing cemented carbide and cermets, functionally graded cemented carbides, and binder design of cemented carbides. Furthermore, this review covers some historical background that motivated the microstructure design as well as the status of each class of materials nowadays. The paper aims at categorising cemented carbides in a structured way and to serve as an introduction to cemented carbide microstructures for engineers, researchers and scientists.
494 citations
15 Oct 2011-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the composites of graphene platelets and powdered aluminum were made using ball milling, hot isostatic pressing and extrusion and the mechanical properties and microstructure were studied using hardness and tensile tests, as well as electron microscopy, X-ray diffraction and differential scanning calorimetry.
Abstract: Composites of graphene platelets and powdered aluminum were made using ball milling, hot isostatic pressing and extrusion. The mechanical properties and microstructure were studied using hardness and tensile tests, as well as electron microscopy, X-ray diffraction and differential scanning calorimetry. Compared to the pure aluminum and multi-walled carbon nanotube composites, the graphene–aluminum composite showed decreased strength and hardness. This is explained in the context of enhanced aluminum carbide formation with the graphene filler.
492 citations
TL;DR: In this article, it has been shown that a relatively simple atomic model does account for the sign of the heat of formation, ΔH, in a wide variety of alloy systems.
Abstract: In Part I of this paper [1] it has been shown that a relatively simple atomic model does account for the sign of the heat of formation, ΔH, in a wide variety of alloy systems. Here we consider numerical values of ΔH for solid alloys; a quite satisfactory agreement is obtained for the heat of formation of intermetallic compounds of transition metals, including their borides, carbides and nitrides. Transition metal suicides, germanides, carbides, and nitrides, can be treated in the same way as the other compounds if one allows for an additional positive energy contribution required to convert elementary Si, Ge, C or N2 into a metal (8, 6, 24 and 57 kcal per gram-atom of these four elements, respectively). As an example, predictions for heats of formation of binary intermetallic compounds containing a rare-earth element have been tabulated.
472 citations
TL;DR: In this paper, the superconductivity of a quaternary intermetallic, yttrium palladium boride carbide, was observed at 23 K in a multiple-phase bulk sample.
Abstract: COPPER oxide compounds have dominated superconductivity research since 1986 because of their very high transition temperatures (Tcs). In contrast, no new families of high-Tc intermetallic compounds have been discovered since the A15-type Nb3X compounds were first reported in 19531. The intermetallies with highest Jcs have all been based on niobium, with the highest Tcs being 20.7 K for bulk Nb3Ga and 23.2 K for sputtered films of Nb3Ge (refs 2, 3). Here we report the observation of superconductivity at 23 K in a multiple-phase bulk sample of a quaternary intermetallic, yttrium palladium boride carbide. This is higher than any Tc reported previously for a bulk intermetallic compound. Although the materials are not yet single-phase, the superconducting volume fraction is large. We propose that this compound may represent the first of a new family of superconducting intermetallics with relatively high Tcs.
468 citations