33 KB301 KB29 KB200020242011Jenko, MonikaKevorkijan, VaružanPaulin, IrenaŠkapin, Srečo D.Šuštaršič, Borivojštevilka:1letnik:45str. 13-19COBISSID:14820630ISSN:1580-2949URN:URN:NBN:SI:doc-6MYQ03L1enInštitut za kovinske materiale in tehnologijeMateriali in tehnologijealuminijeve penealuminijeve zlitinealuminium alloymetalurgija prahovsintranjestiskanjeSynthesis of aluminium foams by the powder-metallurgy process| compacting of precursors| Sinteza aluminijevih pen po postopku metalurgije prahov| stiskanje prekurzorjev|Aluminium foams, produced by the powder-metallurgy route, have a good potential for use in weight-sensitive structural parts. The goal of this study was to evaluate the properties and to optimize the preparation of precursors by a powder-compacting process. Various compacting pressures, from 200 MPa to 900 MPa, were used in the double-axial powder-compacting process for two different aluminium powders: pure aluminium and an AlSi12 alloy with the addition of 1 % of TiH2 as a foaming agent. The green density of the precursors and the distribution of the foaming agent were examined. The powder particles was also characterised. The results of the effective preparation of precursors are shown as the effectiveness of the foaming of the precursors. The relation between the powder characteristics, the aluminium-alloy properties and the preparation of precursors was studied by SEM/EDS analysis, powder-metallurgy standard testing of metallic powders, granulometry, etc. Different parameters were used for the precursor preparation and foaming. The foaming temperature varied between 680 °C and 770°C, and the foaming time was from 6 min to 13 min. The relation between the properties and the applied production parameters was studied in detail and is described in this paperAluminijeve pene, narejene po postopku metalurgije prahov, imajo velik potencial v uporabi lahkih konstrukcij. Cilj raziskave je ugotoviti lastnosti in parametre za optimizacijo priprave prekurzorja po postopku hladnega stiskanja. Za pripravo prekurzorjev smo uporabili obojestransko stiskanje s tlaki od 200 MPa do 900 MPa. Stiskali smo mešanico prahov tehnično čistega aluminija 99,7 % in zlitine AlSi12, v obeh primerih z dodatkom 1 % TiH2 kot penila. Določili smo zelene gostote in porazdelitev penila v prekurzorjih. Naredili smo tudi karakterizacijo vseh treh uporabljenih prahov kot vstopnega materiala. Rezultat uspešne priprave prekurzorjev se kaže v uspešnosti penjenja materiala. Povezavo med lastnostmi prahov, lastnostmi aluminijevih zlitin in priprave prekurzorjev smo raziskovali s SEM/EDS-analizami, s preizkušanjem prahov s standardnimi metodami, uveljavljenimi v metalurgiji prahov, granulometrijo itd. Uporabljeni so bili različni parametri za pripravo in penjenje prekurzorjev. Temperature penjenja so bile med 680 °C in 770 °C, čas penjenja pa med 6 min in 13 min. Povezava med lastnostmi in uporabljenimi parametri za pripravo aluminijevih pen je bila raziskana in je podrobno opisana v tem člankuTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije