JPH07122109B2 - Cu-alkaline earth metal master alloy for superconducting materials - Google Patents
Cu-alkaline earth metal master alloy for superconducting materialsInfo
- Publication number
- JPH07122109B2 JPH07122109B2 JP16200887A JP16200887A JPH07122109B2 JP H07122109 B2 JPH07122109 B2 JP H07122109B2 JP 16200887 A JP16200887 A JP 16200887A JP 16200887 A JP16200887 A JP 16200887A JP H07122109 B2 JPH07122109 B2 JP H07122109B2
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- powder
- superconducting materials
- eutectic
- earth metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229910045601 alloy Inorganic materials 0.000 title claims description 55
- 239000000956 alloy Substances 0.000 title claims description 55
- 239000000463 material Substances 0.000 title claims description 18
- 229910052784 alkaline earth metal Inorganic materials 0.000 title claims description 3
- 239000000203 mixture Substances 0.000 claims description 24
- 230000005496 eutectics Effects 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 19
- 229910000941 alkaline earth metal alloy Inorganic materials 0.000 claims description 2
- 239000000843 powder Substances 0.000 description 28
- 238000000034 method Methods 0.000 description 24
- 238000002844 melting Methods 0.000 description 11
- 230000008018 melting Effects 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 10
- 229910000600 Ba alloy Inorganic materials 0.000 description 8
- 229910001278 Sr alloy Inorganic materials 0.000 description 6
- 238000005452 bending Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000011282 treatment Methods 0.000 description 5
- 239000007791 liquid phase Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 3
- 235000012255 calcium oxide Nutrition 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000010587 phase diagram Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229910052712 strontium Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910000765 intermetallic Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910000858 La alloy Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000006023 eutectic alloy Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000013077 target material Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
Landscapes
- Pressure Welding/Diffusion-Bonding (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は超電導材料用Cu−アルカリ土類金属（以下、
「AE」と略記することがある。）系母合金に係り、特
に、高強度で加工性、均一性に優れた超電導材料用Cu−
AE系母合金に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a Cu-alkaline earth metal (hereinafter,
It may be abbreviated as "AE". ) System master alloys, especially Cu- for superconducting materials with high strength and excellent workability and uniformity.
AE-based master alloy.
［従来の技術］ 超電導状態で電力消費なしに高密度の電流を流す超電導
現象を示す金属材料は、高磁界を経済的に発生できるこ
とから、極めて幅広い利用法が提案されており、特にCu
−Ba−Ｙ−Ｏ系、Cu−La−Sr−Ｏ系等のセラミックス高
温超電導材料の研究開発が注目を集めている。[Prior Art] A metal material that exhibits a superconducting phenomenon in which a high-density current is passed in a superconducting state without power consumption can generate a high magnetic field economically, and therefore an extremely wide range of applications have been proposed.
The research and development of ceramics high temperature superconducting materials such as -Ba-Y-O system and Cu-La-Sr-O system have attracted attention.
従来提供されている酸化物系の高温超電導材料は、加工
性、均一性の点で問題があり、その製造方法の確立が強
く要望されている。最近になって、超電導材料の実用化
のために、スパッタリング法により箔とする方法、ある
いは、シース加工により線材とする方法が提案されてい
るが、いずれの方法においても、均質な母合金を用いる
ことが極めて重要となる。Conventionally provided oxide-based high temperature superconducting materials have problems in workability and uniformity, and there is a strong demand for establishment of a manufacturing method thereof. Recently, in order to put the superconducting material into practical use, a method of forming a foil by sputtering or a method of forming a wire by sheathing has been proposed. In both methods, a homogeneous mother alloy is used. Is extremely important.
従来、Cu−Ba−Ｙ、Cu−La−Sr等のCu−AE−希土類金属
系合金の製造原料となるCu−Ba合金、Cu−La合金等のCu
−AE合金を製造する方法としては、アーク溶解法、黒鉛
坩堝を用いる溶解法等が提案されている。その他、純金
属あるいは合金の粉末を用いて、これをHIP法又はHP法
で焼結体とする焼結法も考えられている。Conventionally, Cu-Ba alloys such as Cu-Ba-Y and Cu-La-Sr, which are raw materials for producing Cu-AE-rare earth metal alloys, Cu such as Cu-La alloys, etc.
As a method for producing an AE alloy, an arc melting method, a melting method using a graphite crucible, and the like have been proposed. In addition, a sintering method in which a powder of pure metal or an alloy is used and the powder is made into a sintered body by the HIP method or the HP method is also considered.
［発明が解決しようとする問題点］ しかしながら、アーク溶解でも、黒鉛坩堝による溶解法
では、いずれも均質な合金が得られ難く、得られる合金
は超電導材料のための母合金やターゲット材としては使
用に耐え得ないものであった。また、割れ易く、取り扱
い性にも難があった。しかも、Ba等のAEは反応性が高
く、溶解による所定量の合金化が極めて難しいという問
題があった。[Problems to be Solved by the Invention] However, even in arc melting, it is difficult to obtain a homogeneous alloy by the melting method using a graphite crucible, and the obtained alloy is used as a master alloy or a target material for a superconducting material. I couldn't stand it. In addition, it was easily broken and was difficult to handle. Moreover, AE such as Ba has a high reactivity, and it is extremely difficult to alloy a predetermined amount by melting.
一方、焼結法では、粉末プロセスを採用する以上、その
純度にも限度があり、粉末の粒径のばらつきや焼成条件
のばらつきのために均質なものを得るのが困難である上
に、得られる焼結体の気孔率にも限度があり、多孔質と
なって十分に緻密なものが得られない。On the other hand, in the sintering method, since the powder process is adopted, its purity is also limited, and it is difficult to obtain a homogeneous material due to the variation in the particle diameter of the powder and the variation in the firing conditions. There is a limit to the porosity of the obtained sintered body, and it becomes porous and cannot be sufficiently dense.
最近になって、カルシア坩堝を用いる溶解法も提案され
ているが、この方法では溶解時に均質な合金が得られる
ものの、鋳造時に均一な母合金、ターゲットを作成する
のに多くの困難があった。Recently, a melting method using a calcia crucible has also been proposed. Although this method can obtain a homogeneous alloy during melting, it has many difficulties in producing a uniform mother alloy and target during casting. .
［問題点を解決するための手段］ 本発明は上記従来の問題点を解決し、高強度で加工性、
均一性に優れた超電導材料用Cu−AE系母合金を提供する
ものであって、Cu粒子間を、共晶点付近の組成のCu−ア
ルカリ土類金属合金で埋めてなることを特徴とする。[Means for Solving Problems] The present invention solves the above-mentioned conventional problems, and has high strength and workability,
Provided is a Cu-AE-based master alloy for superconducting materials having excellent uniformity, wherein Cu particles are filled with Cu-alkaline earth metal alloy having a composition near the eutectic point. .
以下、本発明につき詳細に説明する。Hereinafter, the present invention will be described in detail.
本発明の超電導材料用Cu−AE系母合金は、Cu粒子間が共
晶点付近の組成のCu−AE合金で埋められているものであ
る。なお、本発明において、超電導材料用Cu−AE系母合
金は、AE金属の２種以上を含む合金であっても良い。The Cu-AE-based master alloy for superconducting materials of the present invention is one in which Cu particles are filled with a Cu-AE alloy having a composition near the eutectic point. In the present invention, the Cu-AE-based master alloy for superconducting materials may be an alloy containing two or more kinds of AE metals.
本発明において、AEとしては、Ca,Sr,Ba,Ra等が挙げら
れ、これらのAEのうち、特にSr,Baが挙げられる。In the present invention, examples of AE include Ca, Sr, Ba, Ra and the like, and among these AEs, Sr and Ba are particularly mentioned.
本発明の超電導材料用Cu−AE系母合金は、これらのAE
を、１種又は２種以上含んだものとすることができ、特
に、AEを５〜80重量％含有するCu−AE系合金に好適であ
る。The Cu-AE-based master alloy for superconducting materials of the present invention is
Can be contained alone or in combination of two or more, and is particularly suitable for a Cu-AE alloy containing 5 to 80% by weight of AE.
本発明の超電導材料用Cu−AE系母合金組成としては、具
体的には次のようなものが挙げられる。Specific examples of the Cu-AE based master alloy composition for superconducting materials of the present invention include the following.
Ba1.5Cu，Ba0.4Cu，Sr3.2Cu，Ba1Cu1，Sr1Cu1，cu5S
r1，Ca1Cu1，Mg1Cu2，Ca2Cu1，Mg2Cu1，Cu5Ca1 なお、本発明の超電導材料用Cu−AE系母合金は、AE以外
の第３成分を必要に応じて含有していても良い。Ba 1.5 Cu, Ba 0.4 Cu, Sr 3.2 Cu, Ba 1 Cu 1 , Sr 1 Cu 1 , cu 5 S
r 1 , Ca 1 Cu 1 , Mg 1 Cu 2 , Ca 2 Cu 1 , Mg 2 Cu 1 , Cu 5 Ca 1 The Cu-AE system master alloy for superconducting materials of the present invention contains a third component other than AE. You may contain as needed.
このような本発明の超電導材料用Cu−AE系母合金は、例
えば、以下に説明する方法により容易に製造される。Such a Cu-AE-based master alloy for superconducting materials of the present invention can be easily manufactured by the method described below, for example.
即ち、まず、Cu粉末と、Cu−AEの共晶組成付近、好まし
くは共晶組成のCu−AE合金粉末、更に必要に応じて特性
改善のための他の金属粉末等を調製する。（なお、この
場合、Cu−AE合金粉末は、CuとAEの２種以上とからなる
合金の粉末であっても良い。） Cu−AE合金粉末の調製のためのCu−AE母合金は、アーク
溶解法等により製造することができるが、得られる合金
の純度、均質性等の面からは、カルシア坩堝による溶解
法や、溶融塩電解等を採用するのが有利である。That is, first, a Cu powder, a Cu-AE alloy powder having a Cu-AE eutectic composition vicinity, preferably a eutectic composition, and further other metal powders for improving the characteristics are prepared. (In this case, the Cu-AE alloy powder may be a powder of an alloy composed of two or more kinds of Cu and AE.) The Cu-AE mother alloy for preparing the Cu-AE alloy powder is Although it can be manufactured by an arc melting method or the like, it is advantageous to adopt a melting method using a calcia crucible, a molten salt electrolysis, or the like from the viewpoint of the purity and homogeneity of the obtained alloy.
Cu粉末、Cu−AE合金粉末の粒径は、その混合性の点か
ら、ほぼ等しいことが望ましく、一般には平均粒径５〜
300μｍ程度の粉末とするのが適当である。It is desirable that the particle diameters of the Cu powder and the Cu-AE alloy powder are almost equal from the viewpoint of the mixing property, and generally, the average particle diameter is 5 to 5.
A powder of about 300 μm is suitable.
次いで、これらの原料粉末を所望の合金組成が得られる
ように配合して、十分に混合した後、混合物の加熱、加
圧処理を行なう。加熱、加圧処理HIP法を採用しても良
いが、本発明においては、後述の如く、共晶部が液相と
なるので、HP法でもHIP法と同等の効果を得ることがで
きる。加熱、加圧処理において、混合物は、容器からの
汚染を防止するために、Cu製コンテナを用いるのが好ま
しい。その他、カルシア容器を用いることもできる。Next, these raw material powders are blended so as to obtain a desired alloy composition and sufficiently mixed, and then the mixture is heated and pressurized. Although the heat and pressure treatment HIP method may be adopted, in the present invention, since the eutectic part becomes a liquid phase as described later, the HP method can also obtain the same effect as the HIP method. In the heat and pressure treatments, the mixture preferably uses a Cu container in order to prevent contamination from the container. In addition, a calcia container can also be used.
加熱温度は、Cu−AE共晶組成の共晶点以上で、原料Cu粉
末の融点（約1085℃）以下とする。このような温度で加
熱することにより、共晶組成Cu−AE粉末は溶融して液相
となり、一方、Cu粉末は表面が若干共晶成分と反応する
ものの、溶融せずにそのままの状態で存在するため、Cu
粒子間が共晶組成のCu−AE合金で埋められた、本発明の
超電導材料用Cu−AE系母合金が得られる。The heating temperature is not lower than the eutectic point of the Cu-AE eutectic composition and not higher than the melting point (about 1085 ° C) of the raw material Cu powder. By heating at such a temperature, the eutectic composition Cu-AE powder melts into a liquid phase, while the surface of the Cu powder slightly reacts with the eutectic component, but remains as it is without melting. For Cu
The Cu-AE-based master alloy for superconducting materials of the present invention in which the particles are filled with the Cu-AE alloy having the eutectic composition is obtained.
なお、この加熱は、あまり長時間行なうと、共晶液相が
Cu粒子と反応して金属間化合物を生成してしまい、好ま
しくない。このため、加熱は、加熱温度や合金組成を勘
案して、このような反応が進まないうちに終了させるの
が重要である。If this heating is performed for too long, the eutectic liquid phase
It is not preferable because it reacts with Cu particles to form an intermetallic compound. For this reason, it is important to finish the heating before the reaction proceeds in consideration of the heating temperature and the alloy composition.
なお、加熱、加圧処理の加圧の程度は、通常のHP又はHI
P法で採用される加圧範囲内で適宜決定される。In addition, the degree of pressurization during heating and pressurization is the same as normal HP or HI
It is appropriately determined within the pressurizing range adopted in the P method.
［作用］ 共晶組成の合金は、金属間化合物を生成しており、粘い
ので、極めて強固な相となる。本発明の合金はこのよう
な強固な相であるCu−AE共晶合金属で、Cu粒子間が埋め
られたものであるので、緻密で極めて高強度で割れ難い
ものとなる。[Operation] An alloy having a eutectic composition forms an intermetallic compound and is viscous, so that it becomes an extremely strong phase. Since the alloy of the present invention is such a strong phase Cu-AE eutectic composite metal and the Cu particles are filled with each other, it is dense, has extremely high strength and is difficult to crack.
しかして、このような合金はCu−AE共晶合金の共晶点温
度より高い温度であれば製造することができ、比較的低
温処理による製造が可能とされる。このため、高温で反
応活性が高くなる傾向を有するAEを含有する合金を安定
に製造することができる。Therefore, such an alloy can be manufactured at a temperature higher than the eutectic point temperature of the Cu-AE eutectic alloy, and can be manufactured by a relatively low temperature treatment. Therefore, it is possible to stably produce an alloy containing AE, which tends to have high reaction activity at high temperatures.
また、製造にあたっては、共晶組成合金が液相となるの
で、HP法によってもHIP法と同等の効果が得られ、極め
て均質で緻密な合金を得ることができ、しかも、Cu粒子
表面とこの共晶成分とが反応することにより、共晶部と
Cu粒子との間に著しく高い密着性が得られる。Further, in the production, since the eutectic composition alloy is in the liquid phase, the HP method has the same effect as the HIP method, and an extremely homogeneous and dense alloy can be obtained. By reacting with the eutectic component,
Remarkably high adhesion is obtained with Cu particles.
［実施例］ 以下、実施例について説明する。[Examples] Examples will be described below.
実施例１ Cu−Ba合金の製造 下記粒径のCu粉末及び下記組成及び粒径のCu−Ba合金粉
末の所定量を配合し、十分に混合した後、Cu製コンテナ
でこれを加熱、加圧処理して、Cu−30重量％Ba合金を製
造した。なお、加熱、加圧条件は以下の通りとした。ま
た、Cu−Ba合金の状態図は第１図に示す通りである。Example 1 Production of Cu-Ba alloy A predetermined amount of Cu powder having the following particle size and a predetermined amount of Cu-Ba alloy powder having the following composition and particle size were mixed and sufficiently mixed, and then heated and pressed in a Cu container. Processed to produce Cu-30 wt% Ba alloy. The heating and pressurizing conditions were as follows. The phase diagram of the Cu-Ba alloy is as shown in FIG.
Cu粉末 平均粒径:100μｍ Cu−Ba合金粉末 組成:Cu−89.3重量％Ba （共晶組成、共晶温度:458℃） 平均粒径:70μｍ 処理条件 加熱温度:500〜600℃ 加圧力:300kg/cm2 処理時間:15分 その結果、得られた合金はCu粒子間がCu−Ba合金相で埋
められた、極めて均一で緻密な合金であった。Cu powder Average particle size: 100 μm Cu-Ba alloy powder Composition: Cu-89.3 wt% Ba (eutectic composition, eutectic temperature: 458 ° C) Average particle size: 70 μm Processing conditions Heating temperature: 500-600 ° C Pressing force: 300 kg / cm 2 Treatment time: 15 minutes As a result, the obtained alloy was an extremely uniform and dense alloy in which Cu particles were filled with a Cu—Ba alloy phase.
この合金について下記試験方法により曲げ強度を測定
し、従来の粉末焼結法による同一組成の合金の曲げ強度
と比較した。The bending strength of this alloy was measured by the following test method and compared with the bending strength of an alloy having the same composition by a conventional powder sintering method.
結果を第１表に示す。The results are shown in Table 1.
試験方法 5mm×5mm×40mmの試料について３点曲げ試験を行なっ
た。（なお、曲げの間隔は20mmとした。） 実施例２ Cu−Sr合金の製造 下記粒径のCu粉末及びCu−Sr合金粉末の所定量を配合
し、十分に混合した後、Cu製コンテナでこれを加熱、加
圧処理して、Cu−80重量％Sr合金を製造した。なお、加
熱、加圧条件は以下の通りとした。また、Cu−Sr合金の
状態図は第２図に示す通りである。Test method A 3-point bending test was conducted on a sample of 5 mm x 5 mm x 40 mm. (Note that the bending interval was 20 mm.) Example 2 Production of Cu-Sr Alloy After mixing predetermined amounts of Cu powder and Cu-Sr alloy powder having the following particle sizes and thoroughly mixing them, a Cu container was used. This was heated and pressure treated to produce a Cu-80 wt% Sr alloy. The heating and pressurizing conditions were as follows. The phase diagram of the Cu-Sr alloy is as shown in FIG.
Cu粉末 平均粒径:100μｍ Cu−Sr合金粉末 組成:Cu−84重量％Sr （共晶組成、共晶温度:507℃） 平均粒径:70μｍ 処理条件 加熱温度:520〜600℃ 加圧力:300kg/cm2 処理時間:15分 その結果、得られた合金はCu粉末間がCu−Sr合金相で埋
められた、極めて均一で緻密な合金であった。Cu powder Average particle size: 100 μm Cu-Sr alloy powder Composition: Cu-84 wt% Sr (eutectic composition, eutectic temperature: 507 ° C) Average particle size: 70 μm Processing conditions Heating temperature: 520-600 ° C Pressing force: 300 kg / cm 2 Treatment time: 15 minutes As a result, the obtained alloy was a very uniform and dense alloy in which the Cu powder was filled with the Cu—Sr alloy phase.
この合金について実施例１と同様にして曲げ強度を測定
し、従来の粉末焼結法による同一組成の合金の曲げ強度
と比較した。The bending strength of this alloy was measured in the same manner as in Example 1 and was compared with the bending strength of an alloy having the same composition by the conventional powder sintering method.
結果を第１表に示す。The results are shown in Table 1.
第１表より、本発明の合金は極めて高強度であることが
明らかである。 From Table 1, it is clear that the alloy of the present invention has extremely high strength.
［発明の効果］ 以上詳述した通り、本発明の超電導材料用Cu−AE系母合
金は、Cu粒子間がCu−AE共晶組成の合金で埋められてい
るため、緻密で均質な合金とすることができ、しかも、
粘いCu−AE共晶組成合金による接合効果により、極めて
高強度で割れ難い。[Effects of the Invention] As described in detail above, since the Cu-AE-based master alloy for superconducting materials of the present invention is filled with an alloy having a Cu-AE eutectic composition between Cu particles, a dense and homogeneous alloy is obtained. You can, and
Due to the bonding effect of the viscous Cu-AE eutectic composition alloy, it has extremely high strength and is difficult to crack.
本発明によれば、加工性、機械的特性に優れ、均質かつ
緻密で高特性な超電導材料用Cu−AE系母合金が提案され
る。According to the present invention, a Cu-AE-based master alloy for superconducting materials, which is excellent in workability and mechanical properties, is homogeneous, dense, and has high properties is proposed.
第１図及び第２図はそれぞれCu−Ba合金、Cu−Sr合金の
状態図である。1 and 2 are phase diagrams of Cu-Ba alloy and Cu-Sr alloy, respectively.
Claims (1)
カリ土類金属合金で埋めてなることを特徴とする超電導
材料用Cu−アルカリ土類金属系母合金。1. A Cu-alkaline earth metal master alloy for superconducting materials, wherein Cu particles are filled with a Cu-alkaline earth metal alloy having a composition near the eutectic point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16200887A JPH07122109B2 (en) | 1987-06-29 | 1987-06-29 | Cu-alkaline earth metal master alloy for superconducting materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16200887A JPH07122109B2 (en) | 1987-06-29 | 1987-06-29 | Cu-alkaline earth metal master alloy for superconducting materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS648234A JPS648234A (en) | 1989-01-12 |
| JPH07122109B2 true JPH07122109B2 (en) | 1995-12-25 |
Family
ID=15746292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16200887A Expired - Lifetime JPH07122109B2 (en) | 1987-06-29 | 1987-06-29 | Cu-alkaline earth metal master alloy for superconducting materials |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07122109B2 (en) |
-
1987
- 1987-06-29 JP JP16200887A patent/JPH07122109B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS648234A (en) | 1989-01-12 |
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