Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

Optimization of Fe and Al elemental powders sintering parameters by DTA analysis

nr katalogowy: 52715

Sintered iron aluminides are very promising novel structural materials mainly because of their attractive physical and mechanical properties, but also because of the low price of raw materials used for their manufacture [1]. Powder metallurgy (PM) eliminates many of the limitations during the fabrication process [2]. For example, PM enables forming of products with complex shape, choosing almost arbitrary chemical compositions, deals with problem of grain overgrowth, gives better chemical and structure homogeneity as well it is an energy-saving process [3÷5]. However, in case of the Fe-Al phases, the use of this method is limited by the necessity of controlling of the SHS (self-propagating high-temperature synthesis) reaction [3]. SHS occurring during sintering of Fe and Al elemental powders mixture is very rapid and strongly exothermic, which unfortunately may cause unwanted porosity of the sinters [6]. Our previous studies [7÷10] show the great complexity of phenomena taking place during presintering process of Fe and Al powders. These effects correlated with diffusion and phase transformations were also studied by other researchers [1, 3, 4]. It was concluded that the mechanism of exothermic phase transformations is strongly correlated with many factors, such as chemical composition of the sample, elemental powder particles size, atmosphere, and the heating rate. It is important that only the formation of the exothermic Fe2Al5 phase was reported prior to the formation of finally-wanted FeAl phase [1]. Our last investigations show however that not only Fe2Al5 but also other high aluminum phases - FeAl3 and FeAl2 could be found in the samples structure sintered at temperature lower than the SHS reaction temperature. In order to limit unfavorable influence of the SHS on sinter structure, the optimization of the powders particles size, the compact pressure and the heating rate was done in this work. EXPERIMENTAL Investigation[...]

Jeśli masz wykupiony/przyznany dostęp - zaloguj się. Skorzystaj z naszych propozycji zakupu!

Publikacja


e-Publikacja (format pdf) - nr 52715 "Optimization of Fe and Al..." licencja: Osobista Produkt cyfrowy	10.00 zł

Zeszyt


INŻYNIERIA MATERIAŁOWA - e-zeszyt (pdf) 2010-3 licencja: Osobista Produkt cyfrowy	65.00 zł

Prenumerata

INŻYNIERIA MATERIAŁOWA - prenumerata cyfrowa
licencja: Osobista

Produkt cyfrowy
Nowość

402.00 zł

INŻYNIERIA MATERIAŁOWA - papierowa prenumerata roczna + wysyłka
licencja: Osobista

Szczegóły pakietu

Nazwa
INŻYNIERIA MATERIAŁOWA - papierowa prenumerata roczna	492.00 zł brutto 455.56 zł netto 36.44 zł VAT (stawka VAT 8%)
INŻYNIERIA MATERIAŁOWA - pakowanie i wysyłka	21.00 zł brutto 17.07 zł netto 3.93 zł VAT (stawka VAT 23%)

513.00 zł

INŻYNIERIA MATERIAŁOWA - PAKIET prenumerata PLUS
licencja: Osobista

Szczegóły pakietu

Nazwa
INŻYNIERIA MATERIAŁOWA - PAKIET prenumerata PLUS (Prenumerata papierowa + dostęp do portalu sigma-not.pl + e-prenumerata)	600.00 zł brutto 555.56 zł netto 44.44 zł VAT (stawka VAT 8%)

600.00 zł

Zeszyt

2010-3

Twój Koszyk

Publikacja

Zeszyt

Prenumerata

Zeszyt

Czasopisma