Influence of Processing Parameters on the Conduct of Electrical Resistance Sintering of Iron Powders

Metals

FranciscoG. Cuevas¹  Raquel Astacio²  Fátima Ternero²  EduardoS. Caballero²  JuanM. Montes² 

[1] Department of Chemical Engineering, Physical Chemistry and Materials Science, Higher Technical School of Engineering, University of Huelva, Campus El Carmen, Avda. 3 de marzo s/n, 21071 Huelva, Spain;Engineering of Advanced Materials Group, Higher Technical School of Engineering, University of Seville. Camino de los Descubrimientos s/n, 41092 Sevilla, Spain;

关键词: electrical resistance sintering;    electrical consolidation;    MF-ERS;    FAST;    powder metallurgy;    hot pressing;   

DOI  :  10.3390/met10040540

来源: DOAJ

【 摘 要 】

The influence of the applied pressure and electrical parameters on the macrostructure of specimens consolidated by the medium-frequency electrical resistance sintering technique (MF-ERS) is analysed in this work. This technique is based on the application of pressure to a mass of conductive powder that, simultaneously, is being crossed by a high intensity and low voltage electric current. The simultaneous action of the pressure and the heat released by the Joule effect causes the densification and consolidation of the powder mass in a very short time. The effect of the current intensity and heating time on the global porosity, the porosity distribution, and the microhardness of sintered compacts is studied for two applied pressures (100 and 150 MPa). For the different experiments of electrical consolidation, a commercially available pure iron powder was chosen. For comparison purposes, the properties of the compacts consolidated by MF-ERS are compared with the results obtained by the conventional powder metallurgy route (cold pressing and furnace sintering). Results show that, as expected, higher current intensities and dwelling times, as well as higher pressures and the consolidation of compacts with lower aspects ratios, produce denser materials.

【 授权许可】

Unknown