DE1483232B1 - Use of an easily deformable zirconium titanium niobium alloy as a material for the production of superconductors - Google Patents

Description

1 2

The invention relates to the use to be melted, after which the blank is through

of alloys of zirconium, titanium and niobium brought to suitable dimensions as forging, too

Material for the production of superconductors. rolled into a bar and finally made into wire with

Numerous metals and alloys are drawn to the desired cross-section. The wire

knows, which is superconducting at low temperatures 5 is then in a strongly cold-deformed supply

but their normal conductivity was restored, in which the critical currents on the

are sufficient if a critical current is exceeded. highest value.
For many applications it is desirable that
this critical current is as high as possible. One

Group of alloys with a high critical io example
Electricity consists of niobium and zirconium. To the

highest possible critical currents with niobium-zirconia A blank of 200 g made of an alloy with

nium alloys, it is necessary to use 25% zirconium and 15% titanium as well as a residual

That the alloy is as largely as possible in niobium content was easily forged at 1000 ° C

is in a cold-deformed state. The alloy 15 and rolled into a bar without difficulty,

wrestling with the best properties pointed This became a wire with a diameter

relatively large proportions of zirconium (for example drawn from 0.25 mm, with a stearate lubricant

be 25, 33 or 50 percent by weight), are medium on an anodic film,

however difficult in wires or other for elec- In the drawing the critical current is as radio-

tric windings to process suitable shapes. 20 tion of the magnetic field strength for the on this

In particular, the forging of wise produces wire that is wound as a coil

Cast blanks made of such alloys are heavily applied. The blank experienced during forging

swaying cracks, so that it is generally necessary to dens, roll and pull without in between

a reduction in cross-section following the more complex extrusion process

to fall back on. 25 of more than 95%>. In contrast, a

The invention relates to the use of an alloy with 25% zirconium and 75% niobium

1000 ° C hot and cold deformable alloy, not satisfactory without prior extrusion

standing from 5 to 75% zirconium, 5 to 75% titanium, are forged and during the drawing

Remainder at least 20% niobium in addition to inevitable process significantly damaged.

Impurities, as a material for the production of 30 When using blanks with a Ge superconductor. In particular, the used weight of 200 g was found to be used for alloys Alloy of 20 to 60% zirconium, 10 to 50, with 25% zirconium not sufficient, 6% titanium preferably 15 to 50% titanium, the remainder at least to make the alloy malleable at 1000 ° C 20% niobium in addition to unavoidable impurities. to do that, however, after adding 10% titanium

The alloy is especially suitable for this purpose.
It was preferred to use an alloy consisting of 25% smaller blanks of 15 g were generally zirconium, 15% titanium, the balance niobium in addition to inevitably easier to forge, and it turned out that there were already some impurities. 5% titanium have a favorable influence on forged alloys with a similar composition. However, 3.5% titanium was not sufficient from the USA patents 2,985,531 and 4 ° to make the alloy malleable or rollable to 3,038,798. However, it is possible to make use of the above.

Patents do not indicate that the compounds are thus the lower limit at which titanium

Advantageously used for superconductors, an improvement in processability is achieved

that could. about 5%, however, is to ensure good

The alloys mentioned are relatively forgeable, easy to deform, especially for larger transverse sections, and for low temperature sections, a titanium content of 15% is preferable.
reveal superconducting properties. The limit temperature of the alloy temperature to be used according to the invention, at which the normal resistance of the stanchions contain at least 20% niobium, is significantly higher than the limit temperature of the normal to superconductor boiling point of liquid helium of 4.2 ° K, 50 ability to keep it reasonably high. An increase in which temperature increases the working temperature for the super- zirconium content generally represents the critically conductive alloys. see electricity, but worsens the processability

The superconductors can be in the form of fine wire. Improved with constant zirconium content

Foils and the like in electrical windings and other- titanium the processability, with the good supra-

Ren electrical devices are used. 55 conductive properties were retained. The Pro

The alloys are heavily cold worked, in order to lie of titanium also allows an increase in the to give them a shape. Optionally, zirconium content can be added to the superconducting properties a heat treatment known per se to improve shafts while the good processing is carried out in order to maintain a second phase.

cases, with a further slight improvement in the 60 interstitial impurities can be beneficial

Superconductivity is achieved. Apply properties to superconductivity. at

It is possible because of its good forgeability, but it is against the alloys used so far

the step of extrusion, which is necessary to keep the impurities at a low

normally to be considered value in the manufacturing process in order to ensure adequate processability.

Niobium-zirconium alloys are inserted to ensure 65 speed. The inventively used

omit and reduce processing costs. Deten alloys have the advantage that a

During the wire production, the named le- higher proportion of such impurities can be added.

Alloys can be turned into blanks in the vacuum arc furnace.

Claims (3)

3 4 alloy, consisting of 20 to 60% zirconium, claims: 10 to 50, preferably 15 to 50,% titanium, the remainder at least 20% niobium in addition to the unavoidable 1. Use of a warm at 1000 ° C and impurities for the cold-deformable in claim 1 Alloy consisting of 5 to 5 named purpose. 75% zirconium, 5 to 75% titanium, the remainder at least 3. Use of those mentioned in claim 1 at least 20% niobium in addition to the unavoidable alloy, consisting of 25% zirconium, 15% impurities, as a material for the production of titanium, the remainder niobium in addition to unavoidable impurities Superconductors. cleaning for the one mentioned in claim 1 2. Use of the purpose mentioned in claim 1. 1 sheet of drawings