CN102756512A - Low-magnetism or magnetism-free and high-strength Ni-W alloy composite base band and preparation method thereof - Google Patents
Low-magnetism or magnetism-free and high-strength Ni-W alloy composite base band and preparation method thereof Download PDFInfo
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Abstract
The invention provides a low-magnetism or magnetism-free and high-strength Ni-W alloy composite base band and a preparation method thereof, belonging to the technical field of a high-temperature super-conductive coating conductor texture metal base band. According to the Ni-W alloy composite base band disclosed by the invention, a surface layer is a Ni-W alloy with high W content and the atom percentage content of the W is 7.5-9.3%; and a core layer is a nickel-tungsten alloy with the tungsten atom percentage content of 9.3-12%. The preparation method comprises the following steps of sequentially placing a high-W-content Ni-W alloy blank ingot (A) which is prepared by a smelting method and has the atom percentage content of the W of 7.5-9.3%, and Ni-W mixed powder (B) with the atom percentage content of the W of 9.3-12% into a mould according to the sequence of A-B-A; utilizing a discharge plasma sintering technology to sinter to obtain a composite blank ingot; then, carrying out hot rolling and carrying out cold rolling treatment on a hot rolling blank ingot; and then, crystallizing and annealing, carrying out cold rolling to obtain the composite base band, and re-crystallizing and annealing the base band under the protection of Ar/H2 mixed gas to obtain the Ni-W alloy composite base band. The composite base band has the advantages of high strength, low magnetism or no magnetism and strong cubic structure, and can further meet the requirement of further improving the performance of an YBCO (Yttrium Barium Copper Oxide) coating conductor.
Description
Technical field
The present invention relates to a kind of low or nonmagnetic, high strength Ni-W alloy composite baseband and preparation method thereof, belong to conductor of high-temperature superconductor coat texture metal base band technical field.
Background technology
Along with the raising of high temperature superconducting materia performance and the continuous progress of Refrigeration Technique; And itself intrinsic superior physical characteristic; High temperature superconductor technology will be applied to the every field in our life day by day, like electric power, traffic, transportation, magnet technology, military affairs etc.The people such as Amit Goyal of U.S.'s Oak Ridge National Laboratory in 1996 have obtained to have the metal base band of sharp keen biaxial texture through the technology to the rolling and follow-up recrystallization annealing of pure nickel aximal deformation value; On metallic substrates, obtained to have the transition zone of orientation then through epitaxial growth mode successively; Obtain depositing the template of YBCO; Method epitaxial growth with chemistry or physics goes out to have the texture superconducting layer again, and this technology path also is known as the RABiTS technology.And the technology of preparing of base band is the key of RABiTS technology, and pure nickel is easy to form strong cubic texture, but pure nickel has ferromagnetism; In the application of alternating current, can cause magnetic hystersis loss, and yield strength is also lower, can not satisfies the production and the application of YBCO high temperature coating conductor band; People solved the problems referred to above through the molten admittedly thought of solute afterwards, and the NiW alloy base band is to study the most a kind of alloy base band, and the preparation technology of Ni-5at.%W (Ni5W) alloy base band is very ripe at present; And commercially produce, but, have ferromagnetism (under the T=77K) because its Curie temperature is 330K; Yield strength is not very high, can only satisfy the certain applications of high temperature coating conductor, and along with the yield strength of W atom content rising alloy base band raises; Magnetic also reduces; When the atomic percentage conc of W reaches 9.3% alloy base band under 77K for nonmagnetic, but when the W atomic percentage conc greater than 5% the time, cold rolling and recrystallization annealing is difficult to obtain strong cubic texture through traditional aximal deformation value.In order to prepare high strength, low/nonmagnetic alloy base band, (referring to document Trans. Indian Inst. Met. Vol.57, No. 6 in 2004 in Germany; December 2004, pp. 651-657) adopt tiretube process promptly with Ni-5%W as sheath material, high strength, non-magnetic Ni-10%W rod are inserted in the sheath material as core; Obtain compound billet through hot rolling; Because ectonexine is simple mechanical bond, in follow-up cold-rolled process, be easy to cracking, the base band recrystallization process receives the property effect of ectonexine material more serious; And processing technology is complicated, and the length of band also receives restriction to a certain degree.Chinese patent CN1844430 (open day: on October 11st, 2006) disclose a kind of preparation method of Ni base alloy composite baseband; Through successively placing raw material; Adopt isostatic cool pressing or discharge plasma sintering technology to combine the RABiTS technology to prepare composite baseband; This composite baseband top layer is that the W atomic percent is 3% ~ 5% nickel tungsten, and sandwich layer is that the W atomic percentage conc is the nickel tungsten of 9.3-12%, and this method has overcome the problem of compound billet easy of crack in cold-rolled process; And preparation technology is simpler; And for preparing more high strength, low/non-magnetic alloy base band, outer Ni base alloy composite baseband for high W content (atomic percentage conc of W greater than 7% nickel tungsten) has very big research prospect, and has very big difficulty.
Summary of the invention
The objective of the invention is to have the Ni-W alloy composite baseband of sandwich construction through the preparation of discharge plasma sintering technology; Improve the yield strength of alloy base band; Reduce the whole magnetic of base band, a kind of preparation method of low or nonmagnetic, high strength Ni-W alloy composite baseband is provided for YBCO coating conductor band.
Low or nonmagnetic, high strength Ni-W alloy composite baseband provided by the present invention is composited by top layer and sandwich layer, and the top layer is that the atomic percentage conc of W is 7.5% ~ 9.3% nickel tungsten, and sandwich layer is that the atomic percentage conc of W is the nickel tungsten of 9.3-12%.
The preparation method of low or nonmagnetic, high strength Ni-W alloy composite baseband provided by the present invention may further comprise the steps:
(1) proportioning of initial feed and mould are filled:
With Ni piece and W piece, be 7.5% ~ 9.3% to carry out proportioning according to the atomic percentage conc of W, two kinds of raw material are placed the melting of electromagnetic induction vacuum melting furnace; Obtain the Ni-W alloy cast ingot and forge the top layer Ni-W alloy billet that the doubling cutting obtains high W content subsequently; Code name is A, is the NiW mixed-powder of 9.3-12% with the atomic percentage conc of the W that adopts high-energy ball milling to obtain, and code name is B; As sandwich layer, the order branch of ready raw material according to A-B-A is placed in the mould.
(2) sintering of compound billet:
Adopt the discharge plasma sintering technology, the mould of having filled the A-B-A sample is put into agglomerating plant, sintering under vacuum condition, sintering temperature is 850-950 ℃, the time is 10-20min;
(3) the rolling and recrystallization annealing of compound billet:
The compound billet that sintering is obtained carries out hot rolling, and pass deformation is 5-15%, and total deformation is greater than 30%; Obtain the hot rolling billet, the billet after the hot rolling is carried out cold-rolling treatment, pass deformation is 5-15%; Total deformation is 70%; Carrying out recrystallization annealing subsequently comes the crystallite dimension of the initial billet of refinement (temperature and time can not be too high long, otherwise crystal grain can alligatoring, and temperature and time can not be crossed low too short; Otherwise just can not perfect recrystallization), crystallization processes is again: be warming up to 800 ℃ ~ 1000 ℃ insulation 30min with stove and obtain being used for the initial alloy billet of aximal deformation value before cold rolling.
(4) aximal deformation value of compound billet is cold rolling:
The initial alloy billet that step (3) is obtained carries out that aximal deformation value is cold rolling, and pass deformation is 5-15%, and total deformation is more than 97%, obtains cold rolling composite baseband.
(5) recrystallization annealing of cold rolling base band:
The composite baseband that step (4) is obtained is at Ar/H
2Mixed gas protectedly adopt down the recrystallization annealing of 1100 ℃ ~ 1200 ℃ insulation 2h to obtain to have high strength, the Ni-W alloy composite baseband of low/nonmagnetic, strong cubic texture.
The present invention adopts the method for successively placing material to realize the metallurgical binding and the mechanical bond of ectonexine alloy through the discharge plasma sintering technology; Obtained ectonexine and combined good compound billet, the skin that compound billet metallographic microstructure shape appearance figure (like Fig. 1) demonstrates billet combines well with core material.
The present invention introduces suitable middle recrystallization annealing through cold rolling and comes the crystallite dimension of the initial billet of refinement, more easily obtains strong cubic texture at follow-up aximal deformation value after the cold rolling and recrystallization annealing and have compact grained initial alloy billet.
The present invention is with the Ni-W alloy of high W content (atomic percentage conc of W is 7.5% ~ 9.3%) cladding material as composite baseband, is that the NiW alloy of 9.3-12% has increased the yield strength of base band as the core material of composite baseband and reduced the whole magnetic of base band with the W atomic percentage conc.Adopt the yield strength of the composite baseband of the inventive method preparation to see table 1, than the Ni5W alloy base band, the yield strength of this composite baseband is more than the twice of Ni5W alloy base band.
Description of drawings
Fig. 1 is the compound billet metallographic microstructure of a present invention shape appearance figure.
Fig. 2 is gained alloy base band (111) face utmost point figure among the embodiment 1.
Fig. 3 is gained alloy base band (111) face utmost point figure among the embodiment 2.
Fig. 4 is gained alloy base band (111) face utmost point figure among the embodiment 3.
The specific embodiment
Embodiment 1
With Ni piece and W piece, be 7.5% to carry out proportioning according to the atomic percentage conc of W, two kinds of raw material are placed the melting of electromagnetic induction vacuum melting furnace; Obtain the Ni-7.5at.%W alloy cast ingot and forge the top layer Ni-W alloy billet that the doubling cutting obtains high W content subsequently; Code name is A, is 9.3% NiW mixed-powder with the atomic percentage conc of the W that adopts high-energy ball milling to obtain, and code name is B; As sandwich layer, the order branch of ready raw material according to A-B-A is placed in the mould; Adopt the discharge plasma sintering technology, the mould of populated raw material is put into agglomerating plant (SPS-3.20-MV type discharge plasma agglomerating plant), sintering under vacuum condition; Sintering temperature is 850 ℃; Time is 10min, and the compound billet that sintering is obtained carries out hot rolling, and pass deformation is 5-15%; Total deformation obtains the hot rolling billet greater than 30%; Billet after the hot rolling is carried out cold-rolling treatment; Pass deformation is 5-15%, and total deformation is 70%, carries out suitable recrystallization annealing subsequently; Concrete recrystallization annealing process is: be warming up to 800 ℃ of insulation 30min with stove, obtain being used for the cold rolling preceding initial alloy billet of aximal deformation value; It is cold rolling then the initial alloy billet to be carried out aximal deformation value, and pass deformation is 5-15%, and total deformation is 97%, obtains cold rolling composite baseband; At last with the composite baseband that obtains at Ar-4%H
2Mist (is H in the mist
2Volume content is 4%) protection adopts down that the recrystallization annealing of 1100 ℃ of insulation 2h obtains to have high strength, the Ni-W alloy composite baseband of low magnetic, strong cubic texture.(111) face utmost point figure of this alloy base band is as shown in Figure 2; This composite baseband yield strength at room temperature is 310MPa, is 2.1 times of individual layer Ni-5at.%W alloy base band.
Embodiment 2
With Ni piece and W piece, be 8.5% to carry out proportioning according to the atomic percentage conc of W, two kinds of raw material are placed the melting of electromagnetic induction vacuum melting furnace; Obtain the Ni-8.5at.%W alloy cast ingot and forge the top layer Ni-W alloy billet that the doubling cutting obtains high W content subsequently; Code name is A, is 12% NiW mixed-powder with the atomic percentage conc of the W that adopts high-energy ball milling to obtain, and code name is B; As sandwich layer, the order branch of ready raw material according to A-B-A is placed in the mould; Adopt the discharge plasma sintering technology, the mould of populated raw material is put into agglomerating plant (SPS-3.20-MV type discharge plasma agglomerating plant), sintering under vacuum condition; Sintering temperature is 900 ℃; Time is 10min, and the compound billet that sintering is obtained carries out hot rolling, and pass deformation is 5-15%; Total deformation obtains the hot rolling billet greater than 30%; Billet after the hot rolling is carried out cold-rolling treatment; Pass deformation is 5-15%, and total deformation is 70%, carries out suitable recrystallization annealing subsequently; Concrete recrystallization annealing process is: be warming up to 900 ℃ of insulation 30min with stove, obtain being used for the cold rolling preceding initial alloy billet of aximal deformation value; It is cold rolling then the initial alloy billet to be carried out aximal deformation value, and pass deformation is 5-15%, and total deformation is 98%, obtains cold rolling composite baseband; At last with the composite baseband that obtains at Ar-4%H
2The mixed gas protected Ni-W alloy composite baseband that adopts the recrystallization annealing acquisition of 1150 ℃ of insulation 2h to have high strength down, hangs down magnetic, strong cubic texture.(111) face utmost point figure of this alloy base band is as shown in Figure 3; This composite baseband yield strength at room temperature is 330MPa, is 2.2 times of individual layer Ni-5at.%W alloy base band.
Embodiment 3
With Ni piece and W piece, be 9.3% to carry out proportioning according to the atomic percentage conc of W, two kinds of raw material are placed the melting of electromagnetic induction vacuum melting furnace; Obtain the Ni-9.3at.%W alloy cast ingot and forge the top layer Ni-W alloy billet that the doubling cutting obtains high W content subsequently; Code name is A, is 12% NiW mixed-powder with the atomic percentage conc of the W that adopts high-energy ball milling to obtain, and code name is B; As sandwich layer, the order branch of ready raw material according to A-B-A is placed in the mould; Adopt the discharge plasma sintering technology, the mould of populated raw material is put into agglomerating plant (SPS-3.20-MV type discharge plasma agglomerating plant), sintering under vacuum condition; Sintering temperature is 900 ℃; Time is 10min, and the compound billet that sintering is obtained carries out hot rolling, and pass deformation is 5-15%; Total deformation obtains the hot rolling billet greater than 30%; Billet after the hot rolling is carried out cold-rolling treatment; Pass deformation is 5-15%; Total deformation is 70%, carries out suitable recrystallization annealing subsequently, and concrete recrystallization annealing process is: be warming up to 1000 ℃ of insulation 30min with stove and obtain being used for the cold rolling preceding initial alloy billet of aximal deformation value; It is cold rolling then the initial alloy billet to be carried out aximal deformation value, and pass deformation is 5-15%, and total deformation is 99%, obtains cold rolling composite baseband; At last with the composite baseband that obtains at Ar-4%H
2The mixed gas protected Ni-W alloy composite baseband that adopts the recrystallization annealing acquisition of 1200 ℃ of insulation 2h to have high strength down, hangs down magnetic, strong cubic texture.(111) face utmost point figure of this alloy base band is as shown in Figure 4; This composite baseband yield strength at room temperature is 345MPa, is 2.3 times of individual layer Ni-5at.%W alloy base band.
Table 1: composite baseband yield strength
Claims (2)
1. one kind low or nonmagnetic, high strength Ni-W alloy composite baseband; It is characterized in that: this composite baseband is composited by top layer and sandwich layer; The top layer is that the atomic percentage conc of W is 7.5% ~ 9.3% nickel tungsten, and sandwich layer is that the atomic percentage conc of W is the nickel tungsten of 9.3-12%.
2. according to the preparation method of said low or nonmagnetic, the high strength Ni-W alloy composite baseband of claim 1, it is characterized in that, may further comprise the steps:
(1) proportioning of initial feed and mould are filled:
With Ni piece and W piece, be 7.5% ~ 9.3% to carry out proportioning according to the atomic percentage conc of W, two kinds of raw material are placed the melting of electromagnetic induction vacuum melting furnace; Obtain the Ni-W alloy cast ingot and forge the top layer Ni-W alloy billet that the doubling cutting obtains high W content subsequently; Code name is A, is the NiW mixed-powder of 9.3-12% with the atomic percentage conc of the W that adopts high-energy ball milling to obtain, and code name is B; As sandwich layer, the order branch of ready raw material according to A-B-A is placed in the mould;
(2) sintering of compound billet:
Adopt the discharge plasma sintering technology, the mould of having filled the A-B-A sample is put into agglomerating plant, sintering under vacuum condition, sintering temperature is 850-950 ℃, the time is 10-20min;
(3) the rolling and recrystallization annealing of compound billet:
The compound billet that sintering is obtained carries out hot rolling, and pass deformation is 5-15%, and total deformation is greater than 30%; Obtain the hot rolling billet; Billet after the hot rolling is carried out cold-rolling treatment, and pass deformation is 5-15%, and total deformation is 70%; Carry out recrystallization annealing subsequently, technology is: be warming up to 800 ℃ ~ 1000 ℃ insulation 30min with stove and obtain being used for the cold rolling preceding initial alloy billet of aximal deformation value;
(4) aximal deformation value of compound billet is cold rolling:
The initial alloy billet that step (3) is obtained carries out that aximal deformation value is cold rolling, and pass deformation is 5-15%, and total deformation is more than 97%, obtains cold rolling composite baseband;
(5) recrystallization annealing of cold rolling base band:
The composite baseband that step (4) is obtained is at Ar/H
2Mixed gas protectedly adopt down the recrystallization annealing of 1100 ℃ ~ 1200 ℃ insulation 2h to obtain to have high strength, the Ni-W alloy composite baseband of low/nonmagnetic, strong cubic texture.
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| CN113278864A (en) * | 2021-04-30 | 2021-08-20 | 西安理工大学 | High-strength high-conductivity titanium diboride copper-based composite material deformation strengthening and toughening method |
| CN113278864B (en) * | 2021-04-30 | 2022-02-22 | 西安理工大学 | High-strength high-conductivity titanium diboride copper-based composite material deformation strengthening and toughening method |
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