CN1034088A

CN1034088A - The preparation method of high field conductor Nb 3 Sn

Info

Publication number: CN1034088A
Application number: CN88105619A
Authority: CN
Inventors: 何牧
Original assignee: Shanghai Institute of Metallurgy of CAS
Current assignee: Shanghai Institute of Optics and Fine Mechanics of CAS
Priority date: 1988-12-23
Filing date: 1988-12-23
Publication date: 1989-07-19
Also published as: CN1013905B

Abstract

The present invention is that "Nb tube rich in Sn" process prepares Nb ₃The improvement of Sn high field conductor method belongs to the processing technology of superconducting conductor, and the present invention has obviously improved Nb by simultaneously element Ti and the plain Mg of quaternary being joined in Nb material and the mother metal ₃The Sn conductor is at the current capacity of the whole practical magnetic field range in the special Lars of 0-20.

Description

The preparation method of high field conductor Nb 3 Sn

The present invention is that "Nb tube rich in Sn" process prepares Nb ₃The improvement of the method for Sn high field conductor belongs to the superconducting conductor processing technology.

Adding element is to improve Nb ₃The effective way of Sn high-field performance.Adopt N _bThe Guan Fuxi legal system is equipped with Nb ₃The Sn conductor is at N _bAdd element Ti(Proc, of Joint Japan-China Seminar IIon Superconductivity, Sendai in the material, Japan, 1986, add element Ti(low-temperature physics P8) or in rich ashbury metal, V7,1985,274) all can obviously improve Nb ₃The Sn conductor is at the current capacity greater than 12 tesla's field regions, and its reason mainly is to have improved upper critical field Hc ₂, and in rich ashbury metal, add element Mg, can obviously improve Nb ₃The Sn conductor is at the current capacity less than 12 tesla's field regions, and this is owing to entering Nb ₃The Mg of Sn conversion zone is with Mg-N _b-O compound precipitation phase particle dispersion is distributed in Nb ₃The Sn layer is near in the crystal grain of Cu-Sn-Mg mother metal side, and refinement this part crystal grain, thereby strengthened flux pinning (low-temperature physics journal V9,1987,107).

Because Ti and Mg improve Nb ₃The mechanism of Sn material current capacity is different; In addition, because Ti enters A15 type (N _b, Ti) ₃Sn compound lattice, and occupy N _bThe crystallography position of atom (J.Appl.Phys V55,1984,4330) enters Nb ₃The Mg of Sn conversion zone is with Mg-N _bThe disperse of-O compound precipitation phase is distributed in the Nb of Cu-Sn-Mg mother metal side ₃In the Sn crystal grain, therefore, Ti and Mg are at Nb ₃Exist form also different among the Sn.Thereby, can be at Nb ₃Add Ti and Mg among the Sn simultaneously, thereby improve Nb in the whole field regions of 0-20 tesla ₃The current capacity of Sn.

The inventor had once improved "Nb tube rich in Sn" process and had prepared Nb in CN85107979A ₃The method of Sn high field conductor.The objective of the invention is to further "Nb tube rich in Sn" process be improved, simultaneously Ti and Mg are joined in mother metal and the niobium material as element and quaternary element, Ti and Mg are united improving Nb ₃The current capacity of Sn conductor is had an effect, thereby obviously improves Nb ₃The Sn conductor promptly improves Nb at the current capacity of the whole practical field region of 0-20 tesla ₃The critical current density of Sn conductor.

Below the general "Nb tube rich in Sn" process of explanation prepares binary or adds a kind of Nb of alloying element ₃The method of Sn high field conductor.

Fig. 1 is that "Nb tube rich in Sn" process prepares binary Nb ₃The method of Sn high field conductor.1 is that copper content is that 5-8wt%(wt% is a percentage by weight with the Sn-Cu alloy of the rich Sn of intermediate frequency furnace melting among the figure), the 2nd, rich ashbury metal railway carriage, cold forging are become rod, the 3rd, acid cleaning process with cold drawn.4 is the copper tube of certain size, generally select Cu pipe size should guarantee the homogenizing of Cu pipe and rich ashbury metal after, the name of Sn on average composition less than 38wt%, the 5th, acid cleaning process.6,7,8 is respectively Cu pipe and rich ashbury metal rod.9 and 10 is N _bPipe and acid cleaning process thereof.11 and 12 is OFHC copper pipe and acid cleaning process thereof.The 30th, the rich ashbury metal rod of internal layer copper-clad, middle N _bPipe and outer OFHC Cu manage single core compound bar, and the 31st, with the hexagonal rod of the cold drawn one-tenth certain size of the single core compound bar line length scale of going forward side by side, the 32nd, compound bar pickling.40 and 41 is OFHC Cu pipe and pickling thereof.50 for OFHC Cu pipe and many single core compound bar to carry out multicore compound, 51 and 52 is the cold drawn and stubborn technology of turning round of multicore composite rod.61 are the coiling magnet, and 62 and 63 is Nb ₃Sn generates diffusion heat treatments.

Element Ti is added to N separately _b"Nb tube rich in Sn" process in the material prepares Nb ₃Technological process and Fig. 1 of Sn conductor are basic identical, only need with containing the N of Ti for (0.5-1.5) wt% _b-Ti compo pipe replaces the niobium pipe 9 among Fig. 1.Contain the N of Ti for (0.5-1.5) wt% _bThe preparation method of-Ti compo pipe as shown in Figure 2.20 is high-purity N of beam bombardment among the figure _bMaterial, the 21st, titanium sponge is through the pure Ti material of vacuum consumable electrode arc furnace melting, and the 22nd, with pure N _bThe N that gets through the vacuum consumable electrode arc furnace melting with pure Ti _b-(0.5-1.5) wt%Ti alloy pig, the 23rd, the alloy pig central punch also is hot extruded into tubing and continues to be cold worked into required size under 500-800 ℃.

Element Ti or Mg are joined the N in the Sn-Cu alloy of rich tin separately _bThe Guan Fuxi legal system is equipped with Nb ₃The technological process of Sn conductor is also basic identical with Fig. 1, just to contain the Ti amount for (0.5-1.5) wt% or contain the Mg amount and replace Sn-Cu alloy 1 among Fig. 1 for the rich ashbury metal of (0.4-1.2) wt%.Fig. 3 has illustrated the rich ashbury metal preparation method who contains Ti or contain Mg, 70 is Cu-(30-100 with the non-consumable arc furnace melting among the figure) wt%Ti or Cu-(40-100) the wt%Mg intermediate alloy, the 71st, intermediate alloy adds Sn and Cu is smelted into Sn-(0-5) wt%Cu-(0.5-1.5) wt%Ti or Sn-(0-5) wt%Cu-(0.4-1.2) the rich ashbury metal of wt%Mg.

The "Nb tube rich in Sn" process of a kind of element of above-mentioned interpolation prepares Nb ₃The method of Sn is existing narration in CN85107979.

The invention is characterized in Ti and Mg are joined mother metal or N simultaneously as third and fourth element _bIn the material, make the Nb that contains Ti and Mg simultaneously ₃The Sn high field conductor.

Use method of the present invention, Nb ₃The critical current density of Sn conductor and the relation in magnetic field are as shown in Figure 4.Curve a is not for adding two element nbs of element among the figure ₃The Sn conductor, curve b is for to add Mg to make in the rich ashbury metal Nb ₃The Sn conductor, curve c is at N _bAdd the Nb that Ti obtains in the material ₃Sn conductor, curve d are to add the Nb that Ti obtains in rich ashbury metal ₃The Sn conductor.The present invention adds the Nb that contains Ti, Mg of two kinds of elements simultaneously ₃The relation curve of Sn conductor is e among the figure.As seen from the figure, adopt the Nb that contains Ti, Mg of method preparation of the present invention ₃The Sn high field conductor is at the practical magnetic field range of the special Lars of 0-20, and its critical current density significantly improves, thereby has improved Nb ₃The Sn conductor adds the current-carrying ability.

Below in conjunction with description of drawings a plurality of embodiment of the present invention:

Embodiment 1: the N that makes with Fig. 2 method _b-(0.5-1.5) wt%Ti compo pipe 23 replaces the N among Fig. 1 _bPipe 9, the Sn-(0-5 that makes in order to Fig. 3 method) wt%Cu-(0.4-1.2) the rich Sn alloy of wt%Mg replaces the Cu-Sn alloy 1 among Fig. 1.Promptly at Nb ₃In the Sn conductor preparation process, Ti adds N to as element _bIn the time of in the material, Mg joins in the rich ashbury metal of mother metal as the quaternary element.All the other technologies are identical with Fig. 1.

Embodiment 2: flow preparation Cu-Ti or the Cu-Mg alloy of pressing earlier Fig. 5,80 is with vacuum medium frequency induction furnace melting Cu-(30-50 among the figure) wt%Ti or Cu-(40-60) the wt%Mg intermediate alloy, the 81st, intermediate alloy adds Cu and is smelted into Cu-(0.4-1.5) wt%Ti or Cu(0.2-3) the wt%Mg compo pipe.

With the Cu-(0.4-1.5 that makes by Fig. 5 method) wt%Ti or Cu-(0.2-3) wt% Mg compo pipe 82 replaces the copper tube 4 among Fig. 1, with the rich ashbury metal Sn-(0-5 that contains Mg or Ti that makes by Fig. 3 method) wt%Cu-(0.4-1.2) wt%Mg or Sn-(0-5) wt%Cu-(0.5-1.5) wt%Ti replaces the rich ashbury metal 1 among Fig. 1, promptly at Nb ₃Among the Sn conductor preparation technology, Ti and Mg add N respectively to as element and quaternary element _bIn the Cu material and rich Sn alloy in the pipe.The point of addition of the plain Mg of element Ti and quaternary can exchange, and promptly as replace the copper tube 4 among Fig. 1 with the Cu-Ti alloy, then replaces 1 among Fig. 1 with the rich Sn alloy that contains Mg; As replace the copper tube 4 among Fig. 1 with the Cu-Mg alloy, then replace 1 among Fig. 1 with the rich ashbury metal that contains Ti.

Embodiment 3: as shown in Figure 6, it is the high-purity N of using through beam bombardment _bThe ingot central punch is made single core Cu/N _b/ Cu-(0.4-1.5) the wt%Ti extruded tube replaces the N of the interior overcoat Cu among Fig. 1 _bPipe uses Sn-(0-5 simultaneously) wt%Cu-(0.4-1.2) the rich ashbury metal of the rich ashbury metal rod of wt%Mg replacement Sn-Cu.71 is Sn-(0-5 among Fig. 3 among Fig. 6) wt%Cu-(0.4-1.2) the rich ashbury metal rod of wt%Mg, 2,3rd, be that the rich ashbury metal railway carriage, cold forging among Fig. 1 becomes rod and acid cleaning process with cold drawn, be to contain Mg in the present rich ashbury metal.82 is the resulting Cu-(0.4-1.5 of Fig. 5 technology) wt%Ti alloy tubulose inner sleeve, the 5th, as acid cleaning process identical among Fig. 1.The 90th, through the N of beam bombardment melting _bThe ingot central punch has replaced the 9(niobium pipe among Fig. 1).10,11,12 is identical with Fig. 1.The 16th, with interior, in, outer Cu-(0.4-1.5) the Nb ingot and the OFHC Cu pipe of wt%Ti sleeve, punching match, and carries out electron beam soldering and sealing in a vacuum, makes Cu/N _b/ Cu-(0.4-1.5) wt%Ti composite tube extrusion ingot, the 17th, the tubular extrusion ingot is 500-800 ℃ of following hot extrusion, and the 18th, extruded tube is cold drawn and cold rollingly become required size, the 19th, acid cleaning process.The 33rd, will contain rich ashbury metal rod and the Cu/N of Mg _b/ Cu-(0.4-1.5) the wt%Ti extruded tube is combined into single core compound bar.The flow process of all the

other labels

31,32,40,41,50,51,52,61,62,63 is identical with Fig. 1.

Embodiment 4: the same Fig. 6 of technological process, and just with the N that punches _b-(0.5-1.5) the wt%Ti alloy pig replaces the N of central punch _bIngot 90 is with pure red copper inner sleeve replaced C u-(0.4-1.5) wt%Ti alloy tubulose inner sleeve 82.Promptly form Cu/N _b-(0.5-1.5) the wt%Ti/Cu extruded tube is compound with the rich ashbury metal that contains Mg again.

Claims

1, the present invention is that "Nb tube rich in Sn" process prepares Nb ₃The improvement of Sn high field conductor method belongs to the processing technology of superconducting conductor, the invention is characterized in Ti and Mg are joined in mother metal and the niobium material simultaneously as third and fourth element.

2, by the described preparation of claim 1 Nb ₃The method of Sn high field conductor is characterized in that Ti adds N as element _bIn the material, Mg adds in the rich ashbury metal of mother metal as the quaternary element.

3, by claim 1 or 2 described preparation Nb ₃The method of Sn high field conductor is characterized in that joining N _bTi in the material is with N _b-(0.5-1.5) form of wt%Ti compo pipe adds, and the Mg that joins in the rich ashbury metal is with Sn-(0-5) and wt%Cu-(0.4-1.2) formation of wt%Mg alloy adds.

4, by the described preparation of claim 1 Nb ₃The method of Sn high field conductor is characterized in that Ti and Mg are joined N respectively simultaneously as third and fourth element _bIn the Cu material and rich ashbury metal in the pipe, the point of addition of third and fourth element ti and Mg can exchange.

5, by claim 1 or 4 described preparation Nb ₃The method of Sn high field conductor, it is characterized in that joining the plain Mg of element Ti in the copper material or quaternary is with Cu-(0.4-1.5) wt%Ti or Cu-(0.2-3) formation of wt%Mg adds, and is with Sn-(0-5 and add the plain or element Ti of quaternary in the rich ashbury metal to) wt%Cu-(0.4-1.2) wt%Mg or Sn-(0-5) wt%Cu-(0.5-1.5) formation of wt%Ti adds.

6, by the described preparation of claim 1 Nb ₃The method of Sn high field conductor is characterized in that element Ti is with Cu/N _b/ Cu-(0.4-1.5) the wt%Ti extruded tube form to add, and the plain Mg of quaternary is with Sn-(0-5) wt%Cu-(0.4-1.2) formation of wt%Mg joins in the rich Sn alloy.

7, by the described preparation of claim 1 Nb ₃The method of Sn high field conductor is characterized in that element Ti is with Cu/N _b-(0.5-1.5) form of wt%Ti/Cu extruded tube adds, and the plain Mg of quaternary is with Sn-(0-5) wt%Cu-(0.4-1.2) the wt%Mg form joins in the rich Sn alloy.