Both erosive and abrasive wear are common in mechanical systems moving components industrial production. Once they occur machine parts, the task of breakdown maintenance should be carried out, leading to high production costs. Previous research has shown that high-chromium cast iron (HCCI), a commonly used wear-resistant material, experiences repeated particle impacts break up chromium carbides...

Endohedral metal carbides suggest an intriguing relationship to the growth mechanism of endohedral fullerenes; however, due to crystal quality requirements, only a half dozen of these have been characterized by single crystal X-ray diffraction. Likewise, few examples of nonisolated pentagon rule (non-IPR) endohedral fullerenes have been crystallographically characterized, beginning with Sc3N@C6...

Ultrafine tungsten carbide-nickel (WC-Ni) cemented carbides with varied fractions of silicon carbide (SiC) nanowhisker (0-3.75 wt.%) were fabricated by spark plasma sintering at 1350°C under a uniaxial pressure of 50 MPa with the assistance of vanadium carbide (VC) and tantalum carbide (TaC) as WC grain growth inhibitors. The effects of SiC nanowhisker on the microstructure and mechanical prope...

Ultrafiie WC powders were produced from WCla-C3Hs-H2 gas mixtures in a conventional tubular hot-wall downstream CVD reactor. At reaction temperatures between 1100 and 1550°C powders containing W, WZC, WC and carbon were produced. The overall chemical compositions of the tungsten coinpounds as well as the free carbon contents depended strongly on the reaction temperature and the ratio of the rea...

Together with the transition metal carbides and borides, the transition metal nitrides belong to a family of materials that features an unusual combination of outstanding properties, among which are exceptional hardness, high melting point, metallic luster with sometimes vivid colors, and simple metallic structures combined with excellent electrical and thermal conductivities. This combination ...

Layers of Fe-Cr-C Hard facing material containing various amounts of chromium were deposited on mild steel base metal. Optical Microscope (OM), Scanning Electron Microscope (SCM) and X-ray diffraction (XRD) were used to investigate the effect of chromium content of micro structural characteristics of Fe-Cr-C hard facing layers. The M7C3 carbide refinement mechanism exists on base metal. The exp...

The hydrogen evolution reaction (HER) is one of the two important half reactions in current water-alkali and chlor-alkali electrolyzers. To make this reaction energy-efficient, development of highly active and durable catalytic materials in an alkaline environment is required. Herein we report the synthesis of carbon-coated cobalt-tungsten carbide nanoparticles that have proven to be efficient ...

The Ni-based coatings with different content of spherical tungsten carbide were deposited by plasma transfer arc welding (PTAW) method on 304 austenitic stainless steel sheets in this study. The microstructure and wear property of spherical tungsten carbide particle reinforced composite coatings were investigated by means of optical microscope, scanning electron microscope (SEM), X-ray diffract...

Z. Naturforsch. 52 b, 231-236 (1997); received November 15, 1996 Crystal Structure, Magnetic Properties, Rare Earth Metal Rhenium Carbides, Polymeric Rhenium-Carbon Polyanions ErsReiCy, TmsRe2C7, and LusReaC? were prepared by arc-melting of the elemental compo­ nents and subsequent annealing at 800 °C. ErsRe^Cy forms only after the annealing process, whereas the other two carbides were already ...

The paper report on the studies of effect severe plastic deformation structure and properties, including corrosion behavior, 110C-18Cr-Mo bearing steel. Various structural states were formed by methods (SPD) subsequent heat treatment. It is shown that SPD treatment lead to formation a homogeneous with uniform distribution carbides. In this case, leads reduction volume fraction carbides an incre...