KR940005010B1 - Forming method for wire - Google Patents
Forming method for wire Download PDFInfo
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- KR940005010B1 KR940005010B1 KR1019920005654A KR920005654A KR940005010B1 KR 940005010 B1 KR940005010 B1 KR 940005010B1 KR 1019920005654 A KR1019920005654 A KR 1019920005654A KR 920005654 A KR920005654 A KR 920005654A KR 940005010 B1 KR940005010 B1 KR 940005010B1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
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- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
Description
제1도는 열적-기계적 공정에 의한 고온초전도 선재 가공공정.1 is a high temperature superconducting wire processing process by a thermal-mechanical process.
제2도는 가공된 Bi계 초전도 선재의 단면사진.2 is a cross-sectional photograph of the processed Bi-based superconducting wire.
제3도는 초전도 선재의 77K에서의 전류-전압 특성곡선.3 is a current-voltage characteristic curve at 77K of a superconducting wire.
본 발명은 열적-기계적 공정을 이용한 고온초전도 선재의 가공방법에 관한 것이다.The present invention relates to a method for processing high temperature superconducting wire using a thermo-mechanical process.
초전도체는 자기부상열차, 초전도전력저장 시스템, 송전선, 초전도자석 등에 사용되어진다.Superconductors are used in magnetic levitation trains, superconducting power storage systems, transmission lines and superconducting magnets.
이와 같은 응용을 위해서는 초전도체를 가느다란선 형태로 가공하여야 하는데 산화물 세라믹인 고온초전도체는 가공이 용이하지 않을 뿐만 아니라 종래의 초전도체 가공기술은 초전도체 자체를 원하는 형상으로 제조하기 때문에 가공이 어렵고 초전도체에 전류가 흐를 때 발생가능한 사고에 대해 부가적인 안전장치가 필요한 등의 문제점이 있는 것이다.For such applications, superconductors should be processed in the form of thin wires. High-temperature superconductors, which are oxide ceramics, are not easy to process, and conventional superconductor processing techniques are difficult to process because the superconductors themselves are manufactured in the desired shape. There is a problem such as the need for additional safety devices for accidents that may occur when flowing.
본원 발명의 목적은 상기한 문제점을 개선하기 위하여 세라믹 고온초전도체를 금속은관에 충진한 후 열적-기계적 방법을 이용하여 초전도체를 가느다란 선재로 가공하는 방법을 제공하므로서 가공기술을 단순화할 수 있고 기계적 성질을 향상시킬 수 있으므로 특별한 보완장치 없이 사용할 수 있으며 또한 기계적 가공과 열처리에 의하여 초전도체의 미세조직을 제어할 수 있으므로 고온초전도체의 단점인 이방성 전류흐름과 약한 결합을 제거할 수 있는 것이다.An object of the present invention is to provide a method for processing a superconductor into a thin wire by using a thermo-mechanical method after filling the ceramic high temperature superconductor in a metal silver tube in order to improve the above problems can simplify the processing technology and mechanical Because it can improve the properties, it can be used without any special complementary device, and can control the microstructure of the superconductor by mechanical processing and heat treatment, thereby eliminating the weak coupling of the anisotropic current flow which is a disadvantage of the high temperature superconductor.
이하 첨부된 도면에 의하여 상세히 설명하여 보면 제1도는 열적-기계적 공정에 의한 초전도 선재의 가공공정에 관한 것으로서, 먼저 초전도 분말의 혼합비는 Bi1.8Pb0.2Sr2Ca2Cu3O10의 초전도체를 만들 수 있는 조성으로 원료분말인 Bi2O3,PbO,SrCO3,CaCo3와 CuO를 정량 혼합하여 공기중 800-830℃에서 24시간 하소하여 80K급의 초전도상인(Bi,Pb)2Sr2Ca1Cu2O8와 제2상들이 혼합된 덩어리를 만들고 하소된 덩어리를 알루미나 막자사발에서 분쇄한 후 200메쉬의 시브에 통과시켜 75마이크론 이하의 입자를 분리하여 시브를 통과시킨 분말을 외경이 5-10mm인 실린더형 온관에 충진한 후 초전도-은 복합체를 스웨징 공정으로 외경을 3mm 정도로 감소시킨 다음, 인발 공정으로 외경 1mm 이하의 가느다란 선으로 가공하고 인발로 가공된 초전도-은 복합선재를 냉간가압이나 냉간압연으로 최종 두께가 100마이크론 이하인 테이프형 선재로 가공한 후 테이프형 선재내의 초전도 분말을 접합시키기 위해 830-860℃ 온도에서 최대 300시간 동안 열처리하는데 이때 열처리는 산소/알곤=1/13의 저산소압이나 대기중에서 실시하며 이 공정은 초전도-은 복합초전도 선재를 가느다란 선재로 가공할 수 있을 뿐만 아니라, 열적-기계적 공정에 의하여 초전도 입자들이 일방향으로 배열되기 때문에 고임계 전류밀도를 얻을 수 있는 장점이 있다.Referring to the accompanying drawings in detail, Figure 1 relates to the processing of superconducting wire by thermal-mechanical process, the mixing ratio of the superconducting powder first to make a superconductor of Bi 1.8 Pb 0.2 Sr 2 Ca 2 Cu 3 O 10 In order to quantitatively mix Bi 2 O 3 , PbO, SrCO 3, CaCo 3 and CuO as raw materials, it is calcined at 800-830 ℃ for 24 hours in the air to produce 80K superconductor (Bi, Pb) 2 Sr 2 Ca 1 Cu 2 O 8 and a mixture of the second phase to form a mass, the calcined mass was pulverized in an alumina mortar and passed through a 200 mesh sieve to separate particles of 75 microns or less to pass through the sieve powder 5 After filling the 10mm-cylindrical heat pipe, the superconducting-silver composite was reduced to about 3mm by the swaging process, and then the superconducting-silver composite wire processed with a thin line having an outer diameter of 1mm or less was drawn by the drawing process. Cold Or by cold rolling to a tape-shaped wire with a final thickness of 100 microns or less, and then heat-treating for up to 300 hours at a temperature of 830-860 ° C to bond the superconducting powder in the tape-shaped wire. This process can be performed at low oxygen pressure or in the atmosphere. This process can not only process superconducting-silver composite superconducting wires into thin wires, but also achieves high critical current density because the superconducting particles are arranged in one direction by a thermo-mechanical process. There is an advantage.
제2도는 가공된 Bi-계 초전도 선재의 단면 사진으로서 테이프의 정체 두께는 100마이크론 정도로 복합체내의 순수 초전도체의 두께는 약 50마이크론이 된다.FIG. 2 is a cross-sectional photograph of a processed Bi-based superconducting wire, the stagnant thickness of the tape being about 100 microns and the thickness of the pure superconductor in the composite being about 50 microns.
제3도는 초전도 선재의 77K에서의 전류-전압 특성 곡선으로서 측정용 시편의 크기는 35×4×0.1mm이며 초전도체에 흘려준 최대 전류치는 4.2A로 임계 전류밀도는 2,000A/cm2이다.3 is a current-voltage characteristic curve at 77K of a superconducting wire. The test specimen has a size of 35 × 4 × 0.1 mm, the maximum current flowing to the superconductor is 4.2 A, and the critical current density is 2,000 A / cm 2 .
이하 실시예에 의하여 본원 발명의 요지를 상세히 설명하면 다음과 같다.Hereinafter, the gist of the present invention will be described in detail with reference to the following Examples.
[실시예 1]Example 1
원료분말인 Bi2O3, PbO, SrCO3,CaCo3,CuO 분말을 혼합비가 Bi1.8Pb0.2Sr2Ca2Cu3O10의 초전체를 만들수 있는 조성으로 균일하게 혼합하여 알루미나 도가니에 장입한 후 공기중 810℃에서 24시간 소결한다. 하소한 덩어리를 막자사발에서 곱게 갈아서 200메쉬(75마이크론)시브를 통과시켜 균일한 입자를 얻는다. 이 분말을 길이 150mm, 외경 5mm, 내경 3mm인 실린더형의 온관에 장입한 후 양 끝단을 봉한다. 준비된 초전도-은 복합체는 제1도의 가공 공정도에 의해 가느다란 선으로 가공한다.Bi 2 O 3 , PbO, SrCO 3, CaCo 3 and CuO powders, which are raw powders, were mixed into alumina crucibles by uniformly mixing the composition to make a pyroelectric material of Bi 1.8 Pb 0.2 Sr 2 Ca 2 Cu 3 O 10 . After sintering at 810 ℃ in air for 24 hours. The calcined mass is ground finely in a mortar and passed through a 200 mesh (75 micron) sieve to obtain uniform particles. The powder is charged into a cylindrical heat pipe having a length of 150 mm, an outer diameter of 5 mm, and an inner diameter of 3 mm, and then sealed at both ends. The prepared superconducting-silver composite is processed into thin lines by the processing flowchart of FIG.
먼저 스웨징으로 외경을 3mm까지 줄인 후 인발공정을 반복실시하여 점진적을 외경을 1mm까지 감소시킨다. 이후 냉각압연이나 냉간가압공정으로 제2도와 같은 테이프형의 선재로 가공한다.First, the outer diameter is reduced to 3mm by swaging, and the drawing process is repeated to gradually reduce the outer diameter to 1mm. Thereafter, by cold rolling or cold pressing process is processed into a tape-like wire rod as shown in FIG.
이 공정으로 가공된 테이프의 전체 두께는 100마이크론 정도로 복합체내의 순수 초전도체의 두께는 약 50마이크론이 된다. 이 테이프형 초전도체를 공기중 835℃에서 168시간 동안 열처리한 후 다시 냉간가압하며, 이러한 냉간가압과 열처리를 3-5회 반복하여 실시하면 초전도체 내부에 성장하는 초전도 입자들의 배열성이 향상되어 초전도선에 다량의 전류를 흘릴 수 있는 것이다.The total thickness of the tape processed by this process is about 100 microns, and the thickness of the pure superconductor in the composite is about 50 microns. The tape-type superconductor is heat-treated at 835 ° C. for 168 hours and then cold-pressed again. If the cold pressing and heat treatment are repeated 3-5 times, the superconductivity of the superconducting particles growing inside the superconductor is improved. A large amount of current can flow through.
이러한 본원 발명 가공기술을 단순화할 수 있을 뿐만 아니라 금속-은이 초전도체를 둘러 쌓고 있으므로 외부의 충격으로부터 초전도체가 보호되며, 초전도체를 수용할 수 있는 임계전류 이상으로 전류가 흐를시에도 피복된 금속매질이 초과전류를 흡수할 수 있으므로 발생 가능한 사고에 대한 안전성을 확보할 수 있으며, 열처리에 의하여 초전도체의 미세조직을 제어할 수 있으므로 고온 초전도체의 단점인 이 방성 전류 흐름과 입계의 약한 결합을 제거할 수 있는 등의 효과가 있는 것이다.In addition to simplifying the processing technology of the present invention, since the metal-silver surrounds the superconductor, the superconductor is protected from external impact, and the coated metal medium is exceeded even when a current flows above a critical current that can accommodate the superconductor. As it can absorb current, it can secure safety against possible accidents, and it can control microstructure of superconductor by heat treatment, thus eliminating weak coupling of anisotropic current flow and grain boundary, which is a disadvantage of high temperature superconductor. Is effective.
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KR1019920005654A KR940005010B1 (en) | 1992-04-04 | 1992-04-04 | Forming method for wire |
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KR100779912B1 (en) * | 2006-07-19 | 2007-11-29 | 신수정 | A manufacture process of steel bar by cold rolling and cold drawing method |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR100779912B1 (en) * | 2006-07-19 | 2007-11-29 | 신수정 | A manufacture process of steel bar by cold rolling and cold drawing method |
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