JPH01123643A - Method for selecting superconductive powder - Google Patents
Method for selecting superconductive powderInfo
- Publication number
- JPH01123643A JPH01123643A JP62281205A JP28120587A JPH01123643A JP H01123643 A JPH01123643 A JP H01123643A JP 62281205 A JP62281205 A JP 62281205A JP 28120587 A JP28120587 A JP 28120587A JP H01123643 A JPH01123643 A JP H01123643A
- Authority
- JP
- Japan
- Prior art keywords
- superconducting
- powder
- mesh
- superconductive
- superconducting powder
- 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.)
- Pending
Links
- 239000000843 powder Substances 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims description 15
- 239000000919 ceramic Substances 0.000 claims abstract description 10
- 239000011812 mixed powder Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 7
- 239000000203 mixture Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 230000005484 gravity Effects 0.000 description 5
- 239000002887 superconductor Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000013590 bulk material Substances 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005339 levitation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/021—Separation using Meissner effect, i.e. deflection of superconductive particles in a magnetic field
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、セフミックス系の超電導粉体中に含まれた非
超電導粉体を取り除く、超電導粉体の選別方法である。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a method for sorting superconducting powder, which removes non-superconducting powder contained in Cefmix-based superconducting powder.
従来の技術
従来の超電導材料としてはｐｂやＮｂなどのような金属
系のものがあった。最近発見されたＹＢａＣ！ｕｏ。BACKGROUND OF THE INVENTION Conventional superconducting materials include metal-based materials such as PB and Nb. Recently discovered YBaC! Uo.
ＬａＢａＣｕＯやＥｕＢａＣｕＯなどのセラミクス系の
超電導材料は、その臨界温度が常温を上回るという報告
もちゃ、さまざまな応用が期待されている。Ceramic superconducting materials such as LaBaCuO and EuBaCuO are expected to have a variety of applications, as it has been reported that their critical temperatures exceed room temperature.
特にこの種の超電導材料の粉体は、−次的な原料として
大きな需要が見込まれる。具体的な粉体の製法としては
、焼結したバルク材を粉砕して適当な粉体としたことが
考えられる。In particular, this type of superconducting material powder is expected to be in great demand as a secondary raw material. As a specific method for producing powder, it is conceivable that a sintered bulk material is pulverized to obtain a suitable powder.
発明が解決しようとした問題点
しかしながら、セラミックス系の超電導材料では焼結後
のバｌレク材は必ずしもすべてが超電導とはならず、一
部に非超電導材料も含まれているので、上記のような製
法では純砕な超電導粉体が得られないという問題点を有
していた。Problems that the invention sought to solve However, in the case of ceramic-based superconducting materials, not all of the bulk material after sintering becomes superconducting, and some non-superconducting materials are also included. This manufacturing method has the problem that pure superconducting powder cannot be obtained.
本発明はかかる点に鑑み、超電導と非超電導とが混合し
た粉体から超電導粉体だけを選別して取り出す超電導粉
体の選別方法である。In view of this, the present invention is a method for sorting superconducting powder, in which only superconducting powder is selected and extracted from a mixture of superconducting and non-superconducting powder.
問題点を解決するだめの手段
本発明は、超電導メツシュを使って、セラミクス系の超
電導粉体とその一部に含まれる非超電導粉体とを選別す
る超電導粉体の選別方法である。Means for Solving the Problems The present invention is a superconducting powder sorting method that uses a superconducting mesh to separate ceramic-based superconducting powder from non-superconducting powder contained therein.
作 用
本発明は前記した方法により、本質的に弱磁性を示す非
超電導のセラミクス粉体が、超電導メツシュの示すマイ
ナス効果によって反発され、超電導の粉体だけが超電導
メツシュを通り、結果的に純砕な超電導粉体を選別でき
る。According to the method described above, the non-superconducting ceramic powder, which is essentially weakly magnetic, is repelled by the negative effect of the superconducting mesh, and only the superconducting powder passes through the superconducting mesh, resulting in a pure state. Capable of sorting coarse superconducting powder.
実施例
第１図は本発明の第１の実施例における超電導粉体の選
別方法の原理図である。第１図において、１は超電導材
料で作った超電導メツシュ、２はセラミクス系の非超電
導粉体と超電導粉体の混合粉体である。これを超電導メ
ツシュ１上に投入すると、超電導粉体４はそのまま落下
してしまう。これに対して非超電導粉体３は超電導メツ
シュ１を通らず浮上する。すなわち、非超電導のセラミ
クス粉体そのものの持つ弱磁性に対して、超電導メツシ
ュ１がマイナス効果を表わし、非超電導粉体３に反作用
を及ぼす。この力が重力にうち勝って非超電導粉体３を
浮上させる。Embodiment FIG. 1 is a principle diagram of a method for sorting superconducting powder in a first embodiment of the present invention. In FIG. 1, 1 is a superconducting mesh made of a superconducting material, and 2 is a mixed powder of ceramic-based non-superconducting powder and superconducting powder. When this is thrown onto the superconducting mesh 1, the superconducting powder 4 falls as it is. On the other hand, the non-superconducting powder 3 does not pass through the superconducting mesh 1 and floats. In other words, the superconducting mesh 1 has a negative effect on the weak magnetism of the non-superconducting ceramic powder itself, and has a negative effect on the non-superconducting powder 3. This force overcomes gravity and causes the non-superconducting powder 3 to float.
以上のように本実施例による方法によれば、超電導を示
す粉体だけを選別して得られる。As described above, according to the method of this embodiment, only powder exhibiting superconductivity can be selected and obtained.
なお、本実施例では特に周囲温度を規定していないが、
周囲温度は、超電導メツシュあるいは超電導粉体の臨界
温度のいずれか小さい値より低ければよい。たとえば、
臨界温度がともに９０’にであれば、この選別を液体窒
素中で実施すればよい。Note that although the ambient temperature is not particularly specified in this example,
The ambient temperature need only be lower than the smaller of the critical temperature of the superconducting mesh or the superconducting powder. for example,
If both critical temperatures are 90', this selection may be performed in liquid nitrogen.
第２図は、本発明の第２の実施例における超電導粉体の
選別方法の原理図である。同図において超電導粉体、非
超電導粉体、およびその混合粉体そして超電導メツシュ
の番号は、第１図のものと同じとした。第１の実施例と
異なる点は、連続的に選別できる点である。すなわち、
投入口６に混合体２を投入すると、傾斜させた超電導メ
ツシュ上に混合体２が連続して供給できる。。非超電導
粉体３は超電導メツシュの反作用によって浮上しながら
受は口６ａを通って集められる。一方、超電導体４は超
電導メツシュ１をくぐり抜けて受は口６ｂを通して集め
ることができる。FIG. 2 is a principle diagram of a method for sorting superconducting powder in a second embodiment of the present invention. In the same figure, the numbers of superconducting powder, non-superconducting powder, mixed powder thereof, and superconducting mesh are the same as those in FIG. 1. The difference from the first embodiment is that continuous selection is possible. That is,
When the mixture 2 is introduced into the input port 6, the mixture 2 can be continuously supplied onto the inclined superconducting mesh. . The non-superconducting powder 3 floats up due to the reaction of the superconducting mesh and is collected through the opening 6a. On the other hand, the superconductor 4 passes through the superconducting mesh 1 and can be collected through the opening 6b.
以上のように本実施例によれば、超電導粉体を連続的に
選別、収集できる。As described above, according to this embodiment, superconducting powder can be continuously sorted and collected.
第３図は、本発明の第３の実施例における超電導粉体の
選別方法を示す原理図である。この実施例は、混合粉体
２に入っている非超電導粉体３と、臨界温度の低い低温
超電導粉体４ａと、臨界温度の高い高温超電導粉体４ｂ
とをそれぞれ選別する方法である。第１および第２の実
施例と同じ原理を用いて選別する。まず、混合粉体２を
投入口６に投入する。混合粉体２は、超電導メツシュ１
ａ上に流す。ここは、低温雰囲気ＴＬすなわち低温とし
ておき、非超電導粉体３だけを受は口６ａから取り出す
。低温超電導粉体４ａと高温超電導粉体４ｂは超電導メ
ツシュ１ａの穴を通って超電導メツシュ１ｂ上に落下す
る。超電導メツシュ１ｂ上は高温雰囲気ＴＨとしである
ので、低温超電導体４ａは超電導状態を示さず、非超電
導粉体と同じふるまいをして、受は口６ｂに落ちる。高
温超電導粉体４ｂは受は口６Ｃから得られる。FIG. 3 is a principle diagram showing a method for sorting superconducting powder in a third embodiment of the present invention. This embodiment consists of a non-superconducting powder 3 contained in a mixed powder 2, a low-temperature superconducting powder 4a with a low critical temperature, and a high-temperature superconducting powder 4b with a high critical temperature.
This is a method of selecting each. Sorting is performed using the same principle as in the first and second embodiments. First, the mixed powder 2 is charged into the input port 6. Mixed powder 2 is superconducting mesh 1
Flow onto a. Here, a low temperature atmosphere TL is maintained, that is, a low temperature, and only the non-superconducting powder 3 is taken out from the receiving port 6a. The low temperature superconducting powder 4a and the high temperature superconducting powder 4b pass through the holes in the superconducting mesh 1a and fall onto the superconducting mesh 1b. Since there is a high temperature atmosphere TH above the superconducting mesh 1b, the low temperature superconductor 4a does not exhibit a superconducting state and behaves the same as a non-superconducting powder, and the receiver falls into the opening 6b. The high temperature superconducting powder 4b is obtained from the receiving port 6C.
以上のように本実施例によれば、超電導粉体を臨界温度
ごとに選別できる。なお、本実施例では臨界温度を高温
と低温との２つだけに分けたが、超電導メツシュを何層
にも配して雰囲気の温度を細かく分類することによって
、臨界温度を細分化した超電導粉体が得られる。As described above, according to this embodiment, superconducting powder can be sorted by critical temperature. In this example, the critical temperature was divided into only two, high temperature and low temperature. You get a body.
第４図は、本発明の第４の実施例における超電導粉体の
選別方法を示す原理図である。第１〜第３の実施例では
、非超電導粉体の分離に、非超電導粉体の示す弱磁性と
超電導メツシュのマイナス果で生れる浮上刃と、超電導
粉体の重力との差を利用していたので、重力が浮上刃を
上回わる場合には超電導粉体に非超電導粉体が混ざるこ
とがありうる。本実施例は、この重力を排除する選別方
法である。第４図において、７は電磁石で、鉛直方向に
配置（重力の方向）し、磁界を超電導メツシュ１にほぼ
垂直にかける。８と９は遮へい板で、たとえばガラスの
ような非磁性体を用いる。FIG. 4 is a principle diagram showing a method for sorting superconducting powder in a fourth embodiment of the present invention. In the first to third embodiments, the difference between the weak magnetism of the non-superconducting powder and the levitation blade produced by the negative effect of the superconducting mesh and the gravity of the superconducting powder is used to separate the non-superconducting powder. Therefore, if the gravity exceeds the floating blade, non-superconducting powder may be mixed with superconducting powder. This embodiment is a sorting method that eliminates this gravity. In FIG. 4, an electromagnet 7 is arranged vertically (in the direction of gravity) and applies a magnetic field almost perpendicularly to the superconducting mesh 1. 8 and 9 are shielding plates made of a non-magnetic material such as glass.
ここで混合粉体２を遮へい板８と超電導メツシュ１の間
に投入すると、非超電導粉体３は電磁石に引き寄せられ
て、遮へい板に沿って受は口６ａに落ちる。一方、超電
導粉体４は電磁石７０発生する磁界に対して反発する（
マイスナ効果）。こうして超電導粉体４は超電導メツシ
ュ１を通り遮へい板９に沿って受は口６ｂに落ちる。When the mixed powder 2 is placed between the shielding plate 8 and the superconducting mesh 1, the non-superconducting powder 3 is attracted by the electromagnet and falls along the shielding plate into the opening 6a. On the other hand, the superconducting powder 4 repels the magnetic field generated by the electromagnet 70 (
Meisuna effect). In this way, the superconducting powder 4 passes through the superconducting mesh 1 and falls along the shielding plate 9 into the opening 6b.
なおこの選別方式では、超電導メツシュ１は、混合粉体
中に含まれる。可能性のある不純物１１すなわち非超電
導部を含む超電導体を通さないように働く。このような
不純物１０はその非超電導部分の割合が少ないと電磁石
７の反発力の方が強くなり、超電導メツシュ１側に動く
が、非超電導部分が少しでもあると超電導メッ７ュ１の
マイスナ効果によって遮へい板９側には通り抜けられな
い。In this sorting method, the superconducting mesh 1 is contained in the mixed powder. It acts to prevent the passage of possible impurities 11, ie superconductors containing non-superconducting parts. If such an impurity 10 has a small proportion of its non-superconducting portion, the repulsive force of the electromagnet 7 will be stronger and it will move toward the superconducting mesh 1, but if there is even a small amount of non-superconducting portion, the Meissner effect of the superconducting mesh 7 will occur. Therefore, it cannot pass through to the shielding plate 9 side.
以上のように本実施例によれば、全体が超電導を示す粉
体だけを選別して得ることができる。As described above, according to this embodiment, only powder exhibiting superconductivity as a whole can be selected and obtained.
なお、粉体の一粒の中に多少の非超電導部分があっても
よければ、超電導メツシュを取り除くことができる。こ
の場合は落下距離や電磁石７の磁界の強さを変えること
によって、−粉の中で超電導部分の割合が異なる粉体を
分類して採集することもできる。Note that the superconducting mesh can be removed if it is acceptable for some non-superconducting portions to exist in one grain of powder. In this case, by changing the falling distance and the strength of the magnetic field of the electromagnet 7, it is also possible to classify and collect powders with different proportions of superconducting parts among the powders.
発明の詳細
な説明したように、本発明によれば、セラミクス系で非
超電導を含む超電導粉体から純砕あるいは部分的に超電
導を示す粉体を選別して収集することができる、As described in detail, according to the present invention, pure crushed or partially superconducting powder can be selected and collected from ceramic-based superconducting powder including non-superconducting powder.
第１図は本発明における第１の実施例の原理を示す原理
図、第２図は本発明における第２の実施例の原理図、第
３図は本発明における第３の実施例の原理図、第４図は
本発明における第４の実施例の原理図である。
１・・・・・・超電導メツシュ、２・・・・・・混合粉
体、３・・・・・・非超電導粉体、４・・・・・・超電
導粉体、７・・・・・・電磁石。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
８２図
第 ３１１Ａ
第４図Fig. 1 is a principle diagram showing the principle of the first embodiment of the present invention, Fig. 2 is a principle diagram of the second embodiment of the present invention, and Fig. 3 is a principle diagram of the third embodiment of the present invention. , FIG. 4 is a principle diagram of a fourth embodiment of the present invention. 1... Superconducting mesh, 2... Mixed powder, 3... Non-superconducting powder, 4... Superconducting powder, 7... ·electromagnet. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 82 Figure 311A Figure 4
Claims (2)
導粉体とその一部に含まれる非超電導粉体とを選別する
ことを特徴とした超電導粉体の選別方法。(1) A method for sorting superconducting powder, which uses a superconducting mesh to separate ceramic-based superconducting powder from non-superconducting powder contained therein.
ける磁界発生器を前記超電導メッシュと併用することを
特徴とした特許請求の範囲第１項記載の超電導粉体の選
別方法。(2) The method for sorting superconducting powder according to claim 1, characterized in that a magnetic field generator that applies a magnetic field in a substantially perpendicular direction to the superconducting mesh is used together with the superconducting mesh.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62281205A JPH01123643A (en) | 1987-11-06 | 1987-11-06 | Method for selecting superconductive powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62281205A JPH01123643A (en) | 1987-11-06 | 1987-11-06 | Method for selecting superconductive powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01123643A true JPH01123643A (en) | 1989-05-16 |
Family
ID=17635820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62281205A Pending JPH01123643A (en) | 1987-11-06 | 1987-11-06 | Method for selecting superconductive powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01123643A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5026681A (en) * | 1989-03-21 | 1991-06-25 | International Superconductor Corp. | Diamagnetic colloid pumps |
| US5049540A (en) * | 1987-11-05 | 1991-09-17 | Idaho Research Foundation | Method and means for separating and classifying superconductive particles |
-
1987
- 1987-11-06 JP JP62281205A patent/JPH01123643A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5049540A (en) * | 1987-11-05 | 1991-09-17 | Idaho Research Foundation | Method and means for separating and classifying superconductive particles |
| US5026681A (en) * | 1989-03-21 | 1991-06-25 | International Superconductor Corp. | Diamagnetic colloid pumps |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Clogston | Upper limit for the critical field in hard superconductors | |
| Anderson et al. | Superconductivity theories narrow down | |
| Tokiwa-Yamamoto et al. | Composition, crystal structure and superconducting properties of Hg Ba Cu O and Hg Ba Ca Cu O superconductors | |
| EP0660423A2 (en) | Superconductor and method of producing same | |
| US4828685A (en) | Method and apparatus for the enhancement of superconductive materials | |
| JPH01123643A (en) | Method for selecting superconductive powder | |
| JPH0312940B2 (en) | ||
| US6281171B1 (en) | MG-doped high-temperature superconductor having the superconducting anisotropy and method for producing the superconductor | |
| EP0320083B1 (en) | Purification apparatus for superconductor fine particles | |
| EP0564279B1 (en) | Rare earth superconducting body and process for production thereof | |
| Nies et al. | Glass-bonded composites containing superconducting YBa2Cu3O9− y for levitation and magnetic shielding applications | |
| EP0317643B1 (en) | Method of producing oxide superconductor | |
| JPH01119352A (en) | Method for separating superconductor | |
| JPH01258753A (en) | Method and device for selecting superconducting particles | |
| US5378682A (en) | Dense superconducting bodies with preferred orientation | |
| JPH01304060A (en) | Separation method and device for superconductive powder | |
| JPH01210044A (en) | Apparatus for separating superconductive powder | |
| JPH0446883B2 (en) | ||
| Rao | High-temperature ceramic oxide superconductors | |
| JPH01194951A (en) | Method for separating superconductive substance | |
| Oba et al. | Magnetic Separation of High-T c Superconducting Particles | |
| JPH01107856A (en) | Separation and recovery of superconductive material | |
| JP2966119B2 (en) | Manufacturing method of oxide superconductor | |
| Fleury | Superconductivity above the temperature of liquid nitrogen | |
| Lee | Magnetic Properties of YBCO Superconducting Bulk |