Nickel Porous Compacts Obtained by Medium-Frequency Electrical Resistance Sintering
A commercially pure (c.p.) nickel powder was consolidated by Medium-Frequency Electrical Resistance Sintering (MF-ERS). In this consolidation technique, a pressure and the heat released by a high-intensity and low-voltage electrical current are concurrently applied to a metal powder mass. A nickel p...
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MDPI AG
2020-05-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/13/9/2131 |
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| author | Fátima Ternero Eduardo S. Caballero Raquel Astacio Jesús Cintas Juan M. Montes |
| author_facet | Fátima Ternero Eduardo S. Caballero Raquel Astacio Jesús Cintas Juan M. Montes |
| author_sort | Fátima Ternero |
| collection | DOAJ |
| description | A commercially pure (c.p.) nickel powder was consolidated by Medium-Frequency Electrical Resistance Sintering (MF-ERS). In this consolidation technique, a pressure and the heat released by a high-intensity and low-voltage electrical current are concurrently applied to a metal powder mass. A nickel powder with a high tap porosity (86%) and a low applied pressure (only 100 MPa) is chosen in order to be able to obtain compacts with different levels of porosity, to facilitate the study of the porosity influence on the compact properties. The influence of current intensity and heating time on the global porosity values, the porosity and microhardness distribution, and the electrical conductivity of the sintered compacts is studied. The properties of the compacts consolidated by MF-ERS are compared with the results obtained by the conventional powder metallurgy route, consisting of cold pressing and furnace sintering. A universal equation to describe the porosity influence on all the analyzed properties of powder aggregates and sintered compacts is proposed and validated. |
| first_indexed | 2024-03-10T20:02:56Z |
| format | Article |
| id | doaj.art-eefd2d67a8b64e069a0be5c6676a1593 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T20:02:56Z |
| publishDate | 2020-05-01 |
| publisher | MDPI AG |
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| spelling | doaj.art-eefd2d67a8b64e069a0be5c6676a15932023-11-19T23:28:16ZengMDPI AGMaterials1996-19442020-05-01139213110.3390/ma13092131Nickel Porous Compacts Obtained by Medium-Frequency Electrical Resistance SinteringFátima Ternero0Eduardo S. Caballero1Raquel Astacio2Jesús Cintas3Juan M. Montes4Engineering of Advanced Materials Group, Higher Technical School of Engineering, University of Seville, Camino de los Descubrimientos, s/n, 41092 Sevilla, SpainEngineering of Advanced Materials Group, Higher Technical School of Engineering, University of Seville, Camino de los Descubrimientos, s/n, 41092 Sevilla, SpainEngineering of Advanced Materials Group, Higher Technical School of Engineering, University of Seville, Camino de los Descubrimientos, s/n, 41092 Sevilla, SpainEngineering of Advanced Materials Group, Higher Technical School of Engineering, University of Seville, Camino de los Descubrimientos, s/n, 41092 Sevilla, SpainEngineering of Advanced Materials Group, Higher Technical School of Engineering, University of Seville, Camino de los Descubrimientos, s/n, 41092 Sevilla, SpainA commercially pure (c.p.) nickel powder was consolidated by Medium-Frequency Electrical Resistance Sintering (MF-ERS). In this consolidation technique, a pressure and the heat released by a high-intensity and low-voltage electrical current are concurrently applied to a metal powder mass. A nickel powder with a high tap porosity (86%) and a low applied pressure (only 100 MPa) is chosen in order to be able to obtain compacts with different levels of porosity, to facilitate the study of the porosity influence on the compact properties. The influence of current intensity and heating time on the global porosity values, the porosity and microhardness distribution, and the electrical conductivity of the sintered compacts is studied. The properties of the compacts consolidated by MF-ERS are compared with the results obtained by the conventional powder metallurgy route, consisting of cold pressing and furnace sintering. A universal equation to describe the porosity influence on all the analyzed properties of powder aggregates and sintered compacts is proposed and validated.https://www.mdpi.com/1996-1944/13/9/2131electrical resistance sinteringelectrical consolidationMF-ERSECASFASThot pressing |
| spellingShingle | Fátima Ternero Eduardo S. Caballero Raquel Astacio Jesús Cintas Juan M. Montes Nickel Porous Compacts Obtained by Medium-Frequency Electrical Resistance Sintering Materials electrical resistance sintering electrical consolidation MF-ERS ECAS FAST hot pressing |
| title | Nickel Porous Compacts Obtained by Medium-Frequency Electrical Resistance Sintering |
| title_full | Nickel Porous Compacts Obtained by Medium-Frequency Electrical Resistance Sintering |
| title_fullStr | Nickel Porous Compacts Obtained by Medium-Frequency Electrical Resistance Sintering |
| title_full_unstemmed | Nickel Porous Compacts Obtained by Medium-Frequency Electrical Resistance Sintering |
| title_short | Nickel Porous Compacts Obtained by Medium-Frequency Electrical Resistance Sintering |
| title_sort | nickel porous compacts obtained by medium frequency electrical resistance sintering |
| topic | electrical resistance sintering electrical consolidation MF-ERS ECAS FAST hot pressing |
| url | https://www.mdpi.com/1996-1944/13/9/2131 |
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