Alloy for hydrogen absorption and desorption

FIELD: metallurgy.

SUBSTANCE: alloy contains, wt %: titanium 46.3-49.0; copper 0.14-4.5; aluminium 0.15-4.7; calcium 0.03-1.0; magnesium 0.03-0.9; iron - the rest.

EFFECT: increased activity of alloy and its sorption capacity.

1 tbl

 

The invention relates to the field of metallurgy, in particular to compositions of alloys based on titanium used for the absorption and desorption of hydrogen, for the purpose of its application in energy devices that consume hydrogen, and chemical processes.

Promising a battery and a source of hydrogen among base alloys titanium is an intermetallic compound TiFe, characterized by the availability and low cost [1, p. 259, 265].

The disadvantage of this alloy is that it shows very low activity at the initial stage of hydrogenation, which makes it necessary to conduct complex degassing of the alloy are Present prior to hydrogenation reaction.

The prior art discloses a degassing treatment consists of heating the alloy at 350aboutWith or at even higher temperatures for several hours; while, in the working chamber, where degassing is carried out, must be created in a vacuum with a residual pressure of ~ 0,133 PA (10-3mm Hg. calendar) or at even lower residual pressure.

In addition, even if the hydrogenation starts, TiFe alloy exhibits a very slow rate of reaction with hydrogen, and it can take from 3 to 10 weeks to complete the reaction of hydrogenation [2].

Known alloy based on intermetallic compound TiFe with copper, the composition of which is described by the formula TiFeFor 0.9CuA 0.1[2]. Ibid wook�ivalsa, what this alloy is considerably improved as compared with TiFe more rapid achievement of the early hydrogenation and greater speed of reaction with hydrogen. The chemical composition of the alloy TiFeFor 0.9CuA 0.1adopted for the prototype, the following, wt. %: titanium 45,8-45,9; copper 6,0-6,1; iron - the rest. Its sorption capacity for hydrogen desorption (400C) is - 0,938 wt. % H2[3, p. 186], which corresponds to the volume of the hydrogen - 106 DM3N2/kg of the alloy.

Alloy TiFeFor 0.9CuA 0.1(prototype) has a very low sorption capacity, as also indicated in the patent [2].

The object of the invention is the determination of the activation time of the alloy and increase its sorption capacity.

The technical result is achieved in that the alloy containing titanium, iron and copper, additionally contains aluminum, calcium and magnesium in the following ratio of components, wt. %: titanium 46,3-49,0; copper 0,14-4,5; aluminum 0,15-4,7; calcium 0,03-1,0; magnesium 0,03-0,9; iron - the rest.

Was previously made by the ligature, which was fully included aluminum, copper, calcium and magnesium. The proposed alloy can be expressed by the formula TiFe1-XAndX, where A is the alloy having the following composition of components, wt. %: copper 40-42; 8-10 calcium; magnesium 8-9; aluminium - the rest; X=0.01-0.3 to.

The table shows the composition of the alloy and sorbtion� properties.

ComponentsThe composition of the alloy, wt. %
123
Titanium46,347,649,0
Copper0,142,24,5
Aluminum0,152,44,7
Calcium0,030,51,0
Magnesium0,030,40,9
Ironelseelseelse
Sorption properties
Activation time, h706458
Absorptive capacity, sup> 3N2/kg alloy201211216
The desorption capacity, DM3N2/kg alloy172157145

To increase the sorption capacity of the alloy is carried out by introducing into the alloy in a strong hydride forming components such as calcium and magnesium.

The alloy compositions were prepared by melting the starting components, including the ligature, in an electric arc furnace with a nonconsumable tungsten electrode in an atmosphere of pre-purified argon at a residual pressure of 30 - 40 kPa.

Immediately before the activation and hydrogenation of the pieces of the alloy was crushed to pieces the size of 0.5 - 3.0 mm, and then loaded into the reactor.

Activation of the alloy consisted in holding it in an atmosphere of hydrogen filed with the rector, for the hydrogenation under a pressure of 3 MPa and a temperature of 20aboutC. the Activation period was defined by the time from the start of processing of the alloy by hydrogen to heat the reactor.

To determine the amounts of absorbed hydrogen at 20aboutWith used the method of direct absorption of hydrogen under which these quantities are determined by the equation of state of gas, depending on the change in his blood pressure�I in the system of known volume. Means of measuring pressure was exemplary manometer type MO model 1231 (accuracy class - 0,4). To determine the gas flow rate during desorption of hydrogen (50about(C) were used drum gas meter type GSB-400 (accuracy class - 1,0). This means that the pressure was measured with allowable error of less than ± 0.4%, and the gas flow rate with an error of less than ± 1,0%.

Sources of information

1. A. S. Chernikov, V. N. Fadeev, V. I. Savin. Hydride materials as a hydrogen storage //Atomic-hydrogen energy and technology. - Vol. 3. - M.: Atomizdat, 1980, 272.

2. U.S. Patent 4370163, SS 14/00, 1983. Moriwaki et al. Hydrogen storage alloy and process for making same.

3. Alloys-hydrogen accumulators. Ref. ed.: B. A. Kolachev, R. E. Shalin, A. A. Ilyin. - M.: Metallurgy, 1995. - 384 p.


Alloy based on titanium containing copper and iron, characterized in that it additionally contains aluminum, calcium and magnesium in the following ratio of components, wt. %:

Titanium46,3-49,0
Copper0,14-4,5
Aluminum0,15-4,7
Calcium0,03-1,0
MagnesiumOf 0.03 to 0.9
Ironelse



 

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1 tbl, 1 ex

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2 tbl

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