CN102756512B - 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 is by the every field being day by day applied in our life, as electric power, traffic, transport, magnet technology, military affairs etc.The people such as the Amit Goyal of U.S.'s Oak Ridge National Laboratory in 1996 are by having obtained the metal base band with sharp keen biaxial texture to the technique of the rolling of pure nickel aximal deformation value and follow-up recrystallization annealing, then in metallic substrates, obtained by successively epitaxial growth mode the transition zone that has orientation, obtain depositing the template of YBCO, go out to have texture superconducting layer with the method epitaxial growth of chemistry or physics again, this technology path is also known as RABiTS technology.And the technology of preparing of base band is the key of RABiTS technology, 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 meet production and the application of YBCO high temperature coating conductor band, the thought that people were melted admittedly by solute afterwards solves the problems referred to above, NiW alloy base band is to study the most a kind of alloy base band, the preparation technology of Ni-5at.%W (Ni5W) alloy base band is very ripe at present, and commercially produce, but because its Curie temperature is 330K, there is ferromagnetism (under T=77K), yield strength is not very high, can only meet 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, in the time that the atomic percentage conc of W reaches 9.3%, alloy base band is nonmagnetic under 77K, but in the time that W atomic percentage conc is greater than 5%, by traditional aximal deformation value, cold rolling and recrystallization annealing is difficult to obtain strong cubic texture.In order to prepare high strength, low/nonmagnetic alloy base band, Germany in 2004 (referring to document Trans. Indian Inst. Met. Vol.57, No. 6, December 2004, pp. 651-657) adopt tiretube process using Ni-5%W as sheath material, by high strength, non-magnetic Ni-10%W rod inserts in sheath material as core, obtain compound billet by hot rolling, because ectonexine is simple mechanical bond, in follow-up cold-rolled process, be easy to cracking, it is more serious that base band recrystallization process is affected by the character of ectonexine material, and processing technology is more complicated, the length of band is also subject to restriction to a certain extent.Chinese patent CN1844430 (open day: on October 11st, 2006) discloses a kind of preparation method of Ni base alloy composite baseband, by successively placing raw material, adopt isostatic cool pressing or discharge plasma sintering technology to prepare composite baseband in conjunction with RABiTS technology, this composite baseband top layer is that W atomic percent is 3% ~ 5% nickel tungsten, sandwich layer is that W atomic percentage conc is the nickel tungsten of 9.3-12%, the method has overcome the problem that compound billet easily ftractures in cold-rolled process, and preparation technology is simpler, and for preparing more high strength, low/non-magnetic alloy base band, the outer Ni base alloy composite baseband for high W content (nickel tungsten that the atomic percentage conc of W is greater than 7%) has very large Research Prospects, and there is very large difficulty.
Summary of the invention
The object of the invention is to have by the preparation of discharge plasma sintering technology the Ni-W alloy composite baseband of sandwich construction, improve the yield strength of alloy base band, reduce the overall magnetic of base band, for YBCO coating conductor band provides a kind of preparation method of low or nonmagnetic, high strength Ni-W alloy composite baseband.
Low or nonmagnetic, high strength Ni-W alloy composite baseband provided by the present invention, is composited by top layer and sandwich layer, and top layer is the nickel tungsten that the atomic percentage conc of W is 7.5% ~ 9.3%, and sandwich layer is the nickel tungsten that the atomic percentage conc of W is 9.3-12%.
The preparation method of low or nonmagnetic, high strength Ni-W alloy composite baseband provided by the present invention, comprises the following steps:
(1) proportioning of initial feed and mold filling:
By 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 in to the melting of electromagnetic induction vacuum melting furnace, obtain the top layer Ni-W alloy billet that Ni-W alloy cast ingot forges the high W content of doubling cutting acquisition subsequently, code name is A, the NiW mixed-powder that is 9.3-12% by the atomic percentage conc of the W that adopts high-energy ball milling to obtain, and code name is B, as sandwich layer, ready raw material is divided and is placed in mould according to the order of A-B-A.
(2) sintering of compound billet:
Adopt discharge plasma sintering technology, the mould of having filled A-B-A sample is put into agglomerating plant, sintering under vacuum condition, sintering temperature is 850-950 DEG C, the time is 10-20min;
(3) rolling of compound billet and recrystallization annealing:
The compound billet that sintering is obtained carries out hot rolling, pass deformation is 5-15%, total deformation is greater than 30%, obtain hot rolling billet, billet after hot rolling is carried out to cold-rolling treatment, pass deformation is 5-15%, total deformation is 70%, carrying out subsequently recrystallization annealing carrys out the crystallite dimension of the initial billet of refinement (temperature and time can not be too high long, otherwise crystal grain meeting alligatoring, temperature and time can not be too low too short, otherwise just can not perfect recrystallization), recrystallization technique is: be warming up to 800 DEG C ~ 1000 DEG C insulation 30min with stove and obtain for the cold rolling front initial alloy billet of aximal deformation value.
(4) aximal deformation value of compound billet is cold rolling:
It is cold rolling that the initial alloy billet that step (3) is obtained carries out aximal deformation value, 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
2the recrystallization annealing of 1100 DEG C ~ 1200 DEG C of mixed gas protected lower employings insulation 2h obtain there is 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 metallurgical binding and the mechanical bond of ectonexine alloy by discharge plasma sintering technology, obtained ectonexine in conjunction with good compound billet, the skin that compound billet metallographic microstructure shape appearance figure (as Fig. 1) demonstrates billet is combined well with core material.
The present invention introduces suitable middle recrystallization annealing by cold rolling and carrys out the crystallite dimension of the initial billet of refinement, more easily obtains strong cubic texture and have compact grained initial alloy billet at follow-up aximal deformation value after cold rolling and recrystallization annealing.
The cladding material of the present invention using the Ni-W alloy of high W content (atomic percentage conc of W is as 7.5% ~ 9.3%) as composite baseband, the NiW alloy using W atomic percentage conc as 9.3-12% has increased the yield strength of base band and has reduced the overall magnetic of base band as the core material of composite baseband.The yield strength of composite baseband prepared by employing the inventive method is in table 1, and than Ni5W alloy base band, the yield strength of this composite baseband is more than the twice of Ni5W alloy base band.
Brief description of the drawings
Fig. 1 is the compound billet metallographic microstructure of the present invention shape appearance figure.
Fig. 2 is gained alloy base band (111) face utmost point figure in embodiment 1.
Fig. 3 is gained alloy base band (111) face utmost point figure in embodiment 2.
Fig. 4 is gained alloy base band (111) face utmost point figure in embodiment 3.
Detailed description of the invention
Embodiment 1
By 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 in to the melting of electromagnetic induction vacuum melting furnace, obtain the top layer Ni-W alloy billet that Ni-7.5at.%W alloy cast ingot forges the high W content of doubling cutting acquisition subsequently, code name is A, the NiW mixed-powder that is 9.3% by the atomic percentage conc of the W that adopts high-energy ball milling to obtain, and code name is B, as sandwich layer, ready raw material is divided and is placed in mould according to the order of A-B-A; Adopt 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 DEG C, time is 10min, and the compound billet that sintering is obtained carries out hot rolling, and pass deformation is 5-15%, total deformation is greater than 30%, obtains hot rolling billet; Billet after hot rolling is carried out to cold-rolling treatment, pass deformation is 5-15%, and total deformation is 70%, carries out subsequently suitable recrystallization annealing, concrete recrystallization annealing process is: be warming up to 800 DEG C of insulation 30min with stove, obtain for the cold rolling front initial alloy billet of aximal deformation value; Then initial alloy billet is carried out to aximal deformation value cold rolling, pass deformation is 5-15%, and total deformation is 97%, obtains cold rolling composite baseband; Finally by the composite baseband obtaining at Ar-4%H
2mist (is H in mist
2volume content is 4%) the lower Ni-W alloy composite baseband that adopts the recrystallization annealing acquisition of 1100 DEG C of insulation 2h to there is high strength, low magnetic, strong cubic texture of protection.(111) face utmost point figure of this alloy base band as shown in Figure 2; This composite baseband yield strength is at room temperature 310MPa, is 2.1 times of individual layer Ni-5at.%W alloy base band.
Embodiment 2
By 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 in to the melting of electromagnetic induction vacuum melting furnace, obtain the top layer Ni-W alloy billet that Ni-8.5at.%W alloy cast ingot forges the high W content of doubling cutting acquisition subsequently, code name is A, the NiW mixed-powder that is 12% by the atomic percentage conc of the W that adopts high-energy ball milling to obtain, and code name is B, as sandwich layer, ready raw material is divided and is placed in mould according to the order of A-B-A; Adopt 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 DEG C, time is 10min, and the compound billet that sintering is obtained carries out hot rolling, and pass deformation is 5-15%, total deformation is greater than 30%, obtains hot rolling billet; Billet after hot rolling is carried out to cold-rolling treatment, pass deformation is 5-15%, and total deformation is 70%, carries out subsequently suitable recrystallization annealing, concrete recrystallization annealing process is: be warming up to 900 DEG C of insulation 30min with stove, obtain for the cold rolling front initial alloy billet of aximal deformation value; Then initial alloy billet is carried out to aximal deformation value cold rolling, pass deformation is 5-15%, and total deformation is 98%, obtains cold rolling composite baseband; Finally by the composite baseband obtaining at Ar-4%H
2the recrystallization annealing of 1150 DEG C of insulation 2h of mixed gas protected lower employing obtains the Ni-W alloy composite baseband with high strength, low magnetic, strong cubic texture.(111) face utmost point figure of this alloy base band as shown in Figure 3; This composite baseband yield strength is at room temperature 330MPa, is 2.2 times of individual layer Ni-5at.%W alloy base band.
Embodiment 3
By 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 in to the melting of electromagnetic induction vacuum melting furnace, obtain the top layer Ni-W alloy billet that Ni-9.3at.%W alloy cast ingot forges the high W content of doubling cutting acquisition subsequently, code name is A, the NiW mixed-powder that is 12% by the atomic percentage conc of the W that adopts high-energy ball milling to obtain, and code name is B, as sandwich layer, ready raw material is divided and is placed in mould according to the order of A-B-A; Adopt 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 DEG C, time is 10min, and the compound billet that sintering is obtained carries out hot rolling, and pass deformation is 5-15%, total deformation is greater than 30%, obtains hot rolling billet; Billet after hot rolling is carried out to cold-rolling treatment, pass deformation is 5-15%, total deformation is 70%, carries out subsequently suitable recrystallization annealing, and concrete recrystallization annealing process is: be warming up to 1000 DEG C of insulation 30min with stove and obtain for the cold rolling front initial alloy billet of aximal deformation value; Then initial alloy billet is carried out to aximal deformation value cold rolling, pass deformation is 5-15%, and total deformation is 99%, obtains cold rolling composite baseband; Finally by the composite baseband obtaining at Ar-4%H
2the recrystallization annealing of 1200 DEG C of insulation 2h of mixed gas protected lower employing obtains the Ni-W alloy composite baseband with high strength, low magnetic, strong cubic texture.(111) face utmost point figure of this alloy base band as shown in Figure 4; This composite baseband yield strength is at room temperature 345MPa, is 2.3 times of individual layer Ni-5at.%W alloy base band.
Table 1: composite baseband yield strength
Claims (1)
1. the preparation method of low or nonmagnetic, high strength Ni-W alloy composite baseband, this composite baseband is composited by top layer and sandwich layer, top layer is the nickel tungsten that the atomic percentage conc of W is 7.5%～9.3%, and sandwich layer is the nickel tungsten that the atomic percentage conc of W is 9.3-12%;
It is characterized in that, comprise the following steps:
(1) proportioning of initial feed and mold filling:
By 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 in to the melting of electromagnetic induction vacuum melting furnace, obtain the top layer Ni-W alloy billet that Ni-W alloy cast ingot forges the high W content of doubling cutting acquisition subsequently, code name is A, the NiW mixed-powder that is 9.3-12% by the atomic percentage conc of the W that adopts high-energy ball milling to obtain, and code name is B, as sandwich layer, ready raw material is divided and is placed in mould according to the order of A-B-A;
(2) sintering of compound billet:
Adopt discharge plasma sintering technology, the mould of having filled A-B-A sample is put into agglomerating plant, sintering under vacuum condition, sintering temperature is 850-950 DEG C, the time is 10-20min;
(3) rolling of compound billet and recrystallization annealing:
The compound billet that sintering is obtained carries out hot rolling, pass deformation is 5-15%, total deformation is greater than 30%, obtain hot rolling billet, billet after hot rolling is carried out to cold-rolling treatment, and pass deformation is 5-15%, and total deformation is 70%, carry out subsequently recrystallization annealing, technique is: be warming up to 800 DEG C～1000 DEG C insulation 30min with stove and obtain for the cold rolling front initial alloy billet of aximal deformation value;
(4) aximal deformation value of compound billet is cold rolling:
It is cold rolling that the initial alloy billet that step (3) is obtained carries out aximal deformation value, 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
2the recrystallization annealing of 1100 DEG C～1200 DEG C of mixed gas protected lower employings insulation 2h obtain there is high strength, the Ni-W alloy composite baseband of low/nonmagnetic, strong cubic texture.
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| CN103008372B (en) * | 2012-12-29 | 2014-12-31 | 北京工业大学 | Method for preparing nonmagnetic cube-textured NiV alloy composite baseband |
| CN103531305B (en) * | 2013-09-28 | 2016-02-17 | 北京工业大学 | The preparation method of a kind of copper base used for coating conductor/long base band of Ni-based compound |
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| CN105200258A (en) * | 2015-08-11 | 2015-12-30 | 无锡桥阳机械制造有限公司 | Method for preparing sintered nickel alloy material |
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| CN109811310B (en) * | 2019-01-21 | 2020-09-01 | 河南工学院 | Non-ferromagnetic, high-strength and strong-cube-texture nickel-tungsten composite baseband and preparation method thereof |
| CN111112331B (en) * | 2019-12-30 | 2021-03-16 | 河南师范大学 | Preparation method of high-strength texture composite baseband |
| CN111185596A (en) * | 2020-01-06 | 2020-05-22 | 河南师范大学 | Method for improving surface quality of nickel-tungsten alloy base band |
| CN111101007B (en) * | 2020-01-13 | 2022-02-25 | 周口师范学院 | Preparation method of high-performance nickel-based alloy composite strip |
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Effective date of registration: 20221014 Address after: A1501, Innovation Plaza, No. 2007, Pingshan Avenue, Liulian Community, Pingshan Street, Pingshan District, Shenzhen, Guangdong 518118 Patentee after: Shenchuang Superconductor (Shenzhen) Technology Co.,Ltd. Address before: 4-2004, Nanhu Scenic Garden, No. 32, Shuangyong Road, Nanning City, 530000 Guangxi Zhuang Autonomous Region Patentee before: Guo Fuliang |