Alloy accumulating hydrogen

FIELD: metallurgy.

SUBSTANCE: alloy contains the following, wt %: titanium 46.3-48.8; aluminium 0.14-2.87, calcium 0.06-1.24; magnesium 0.08-1.61; and iron is the rest.

EFFECT: reducing activation time and increasing alloy sorption capacity.

1 tbl

 

The invention relates to the field of metallurgy, in particular to compositions of alloys based on titanium, used for hydrogen storage in order to apply it in various clean energy devices and chemical technologies.

The TiFe intermetallic is one of the most famous Bogorodskaya alloys based on titanium. However, this connection is characterized by a significant pressure difference of hydrogen (hysteresis) in the processes of absorption and release of hydrogen and the difficulty in activation.

Known alloy based on titanium, the composition of which is described by the formula TiFe1-XAlXwhere X=0,04 ÷ 0,2 [1, page 94]. It also indicates that the substitution of iron by aluminum in connection TiFe lowers the plateau pressure, reduces the sorption capacity and facilitates activation. This alloy is adopted for the prototype, and its chemical composition comprises, by weight. %: titanium 46,7-48,9; aluminum 1,1-5,5; iron - rest. Activation of the alloy was carried out for 5 days. For full (completed) activation you should spend approximately 25 cycles "absorption-desorption of hydrogen [2]. Were subsequently made some clarifications in the field of stability of the hydride phases, namely: "the Plateau pressure of the hydride phase compounds TiFe0,98Al0,02and TiFe0,96Al0,04everywhere higher than that of TiFe, whereas the TiFe0,94Al0,06The TiFe 0,90Al0,10they are below" [3]. The sorption capacity during desorption of hydrogen at 50°C was as follows: TiFe0,96Al0,04- 1,072 wt. % H2(121 DM3H2/kg alloy); for TiFefor 0.9Ala 0.1- 0,991 wt. % H2(112 DM3H2/kg alloy); for TiFe0,8Alof 0.2- 0,666 wt. % H2(75 DM3H2/kg alloy) [1, page 186].

Alloy-the prototype has a very high activation and low sorption capacity, especially at high aluminium content.

The technical result which sent the invention is to increase the activity of the alloy to reduce the time of activation and the increase in sorption capacity of the alloy based on titanium.

This object is achieved in that the alloy containing titanium, iron and aluminum, additionally contains calcium and magnesium in the following ratio, wt. %: titanium 46,3-48,8; aluminum 0,14-2,87; calcium 0,06-1,24; magnesium 0,08-1,61; iron - rest.

Pre-made ligature, which came fully aluminum, calcium and magnesium. We offer alloy can be expressed by the formula TiFe1-XAndXwhere a ligature having the following composition, wt. %: calcium 21-23, magnesium 28-30, aluminum - else; X=0,01÷0,2.

To obtain the alloy were prepared by three components containing titanium, iron, and aluminum, ka is icy and magnesium, included in the ligature. These compounds and their influence on the sorption properties of the alloy are presented in the table.

Each composition of the alloy floated in arc furnace with prashadam tungsten electrode on a water-cooled copper hearth in an argon atmosphere.

The alloy was activated with hydrogen at a pressure of 3 MPa and a temperature of 20°C. the activation Time was the period from the beginning of the processing of the alloy with hydrogen to heat the reactor.

Table

ComponentsThe composition of the alloy, by weight. %
123
Titanium46,347,548,8
Aluminum0,141,472,87
Calcium0,060,641,24
Magnesium0,080,821,61
Ironrestremained the Noah rest
Sorption properties
The time of activation, h484340
Absorptive capacity, DM3H2/kg alloy212225230
Desorption capacity, DM3H2/kg alloy165160152

Determination of the sorption capacity of the alloy when the absorption of hydrogen was carried out at 20°C by means of direct absorption of hydrogen, whereby the amount of absorbed hydrogen is determined by the equation of state of gas, depending on changes in pressure in the system known volume [4, pages 14-19]. The time of approach to equilibrium was 15 hours or more. To determine the hydrogen pressure was applied to the exemplary gauge type MO model 1231. To determine the gas flow during desorption of hydrogen at 50°C was used drum gas meter type GSB-400.

Sources of information

1. Alloys drives hydrogen. Ref. ed.: B. A. Kolachev, R. E. Yakovlev, A. A. Ilyin. - M.: Metallurgy, 1995. - 384 S.

2. G. Bruzzone, G. Costa, M. Ferretti and G. L.'olcese. Hydrogen storage in aluminium-substituted TiFe compounds // Int. J. Hydrogen Energy, Vol.6. P. 181-184. Pergamon Press Ltd. 1981. Printed in Great Britain. © International Association for Hydrogen Energy.

3. S. H. Lim and Jai-Young Lee. The effects of aluminium substitution in TiFe on its hydrogen absorption properties // Journal of the Less-Common Metals, Vol.97. 1984. P. 65-71.

4. C. I. Mikheeva. Hydrides of transition metals. M.: Izd-vo an SSSR. - 1960. - 212 C.


Alloy based on titanium containing aluminum, iron, characterized in that it additionally contains calcium and magnesium in the following ratio, wt. %: titanium 46,3-48,8; aluminum 0,14-2,87; calcium 0,06-1,24; magnesium 0,08-1,61; iron - rest.



 

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