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For this research, the tungsten carbide coatings were deposited by the thermal spraying technique with an oxyacetylene flame on high-speed steel substrates, in order to improve wear resistance. For the deposit, a high-speed steel was used as a substrate and as a coating commercial tungsten carbide powders reference Eutalloy 10112, which were characterized to identify: composition, microstructure, properties and thermal behavior. The coating was deposited with a CastoDyn DS 8000 equipment, oxidizing flame and projection distance of 140 mm, to analyze aspects such as morphology, thickness and porosity by scanning electron microscopy, adhesion with a pull off test, composition with an X-ray diffraction and hardness with a Vickers-type indenter micro-durometer. To evaluate the resistance of the coating, tribological tests were carried out by pin on disk equipment, the parameters implemented in the test were: 15 N and 20 N for travel distances of 500 m and 300 m. [ABSTRACT FROM AUTHOR]

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This paper presents the opportunity to promote the Colombian industry towards the development of new high performance materials manufactured by powder metallurgy (PM) as an alternative to the conventional manufacturing processes, generating new needs for the national industry. The objective of this work is describe the manufacturing processes of composite materials, type CERMET, formed by a CERAMIC phase, which is tungsten carbide (WC), and a METAL phase which is cobalt (Co). Additionally, analyze at microstructural level the manufactured materials using vacuum sintering process. The designed alloy was a mixture of 88% WC and 12% Co according to ISO K40 standard. The process involved the control of precursor materials, found in powder form, followed by mixing and milling steps, and finally compaction and sintering. The microstructures and chemical compositions obtained by scanning electron microscopy (SEM-EDS) were studied in order to evaluate the mechanical behavior of the CerMet; for that, microhardness tests were performed reaching values of 1289HV0.5, which are related with the low porosity levels such as A02, B00, C00, and average grain size of 1.14 µm. These results indicate that is possible to manufacture wear resistance high performance materials in the country. It highlights the relevance of enhancing the synergy between government entities such as SENAColciencias -Universidad Nacional to create applied research in the country. [ABSTRACT FROM AUTHOR]

Copyright of Revista Tecno Lógicas is the property of Instituto Tecnologico Metropolitano and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Superficies y Vacío is the property of Sociedad Mexicana de Ciencia y Tecnologia de Superficies y Materiales and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Fuentes, El Reventón Energético is the property of Universidad Industrial de Santander and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Tungsten Carbide (W-C) thin films were obtained by r.f. (13.56 MHz) magnetron co-sputtering process in a argon background gas, from a mosaic targets of carbon C (99.9%) and tungsten W (99.9%) with different W and C concentrations. The thin films were deposited at temperatures between 300 and 500°C onto the silicon (100) and AISI D3 steel substrates. Energy Dispersive X-ray spectroscopy analysis showed that the different hexagonal WC and orthorhombic W2C subcarbide obtained phases, directly depended of tungsten concentration in the mosaic targets, and of the deposition temperature. Fourier Transform Infrared Spectroscopy (FTIR) results of films deposited from different mosaic targets reveled the presence of a peak at 1730 cm-1 associated to the C=O, carbonyls groups and a width band centered near 1340 cm-1 in which are two modes of cubic and hexagonal phases of WC at 1144 and 1220 cm-1, respectively. [ABSTRACT FROM AUTHOR]

Studies of the corrosion of the catalysts tungsten carbide in nitric acid are reported. The amount of formed oxide is analyzed by X-ray methods. Changes of the surface area, pore size and morphology of the particles are observed. A dependence between the concentration of the employed acid and the corrosion grad are founded. The results are discussed on the basis of future applications on the fields of the environmental remediation of the gas-diffusion electrodes catalyzed with tungsten carbide. [ABSTRACT FROM AUTHOR]