JPH01183484A - Surface treatment of superconducting ceramic - Google Patents
Surface treatment of superconducting ceramicInfo
- Publication number
- JPH01183484A JPH01183484A JP63007537A JP753788A JPH01183484A JP H01183484 A JPH01183484 A JP H01183484A JP 63007537 A JP63007537 A JP 63007537A JP 753788 A JP753788 A JP 753788A JP H01183484 A JPH01183484 A JP H01183484A
- Authority
- JP
- Japan
- Prior art keywords
- superconducting
- ceramic
- superconducting ceramic
- air
- water
- 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
- 239000000919 ceramic Substances 0.000 title claims abstract description 32
- 238000004381 surface treatment Methods 0.000 title claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000010422 painting Methods 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 24
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 238000000576 coating method Methods 0.000 abstract description 9
- 239000011248 coating agent Substances 0.000 abstract description 8
- 238000001035 drying Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- 239000008188 pellet Substances 0.000 description 5
- 230000006378 damage Effects 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000004590 silicone sealant Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は超電導セラミックスの表面処理方法に係るもの
である。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for surface treatment of superconducting ceramics.
（従来の技術）
最近発見されたＬａ−Ｂａ −（Ｓｒ） Ｃｕ−０系
及びＹ−Ｈａ−Ｃｕ−０系超電導セラミツクスは、高温
で超電導現象を示す物質として産業界の注目を浴びてい
る。(Prior Art) Recently discovered La-Ba-(Sr)Cu-0-based and Y-Ha-Cu-0-based superconducting ceramics are attracting attention in industry as materials that exhibit superconductivity at high temperatures.
特にＹ−Ｈａ−Ｃｕ−０系超電導セラミツクスは、液体
窒素温度（−１９６°Ｃ）以上で超電導現象を示し、従
来冷媒として用いられていた液体ヘリウムに代り、安価
な液体窒素が使用できるため、超電導の応用へ多大なる
期待が寄せられ、実用化の研究が盛んに行なわれている
。In particular, Y-Ha-Cu-0-based superconducting ceramics exhibit superconductivity above the liquid nitrogen temperature (-196°C), and inexpensive liquid nitrogen can be used instead of liquid helium, which has traditionally been used as a refrigerant. There are great expectations for the application of superconductivity, and research into practical application is being actively conducted.
（発明が解決しようとする課題）
しかしながら従来の金属、合金、化合物系の超電導物質
に比して、前記超電導物質はセラミックスであるため、
実用化に際して大きな問題点が２つ挙げられる。(Problems to be Solved by the Invention) However, compared to conventional metal, alloy, and compound-based superconducting materials, since the superconducting materials are ceramics,
There are two major problems in practical application.
その１つは脆い性質のため、加工しに（いこと、もう１
つは経時変化の問題であり、空気中の水分と反応して性
質が変っていくことである。One is that it is difficult to process due to its brittle nature.
The first problem is that it changes over time, and its properties change as it reacts with moisture in the air.
但し後者については未だ完全に明確化されておらず、液
体窒素中、または水中にドブ漬けしたものは数ケ月経時
変化なしというデータもあり、今後の解明が待たれると
ころである。However, the latter has not yet been completely clarified, and there is data showing that there is no change over time for several months after soaking in liquid nitrogen or water, so further clarification is awaited.
従来はこの２点が実用化のネックとされていた。Previously, these two points were considered to be the bottlenecks for practical application.
しかしながら、本発明者等が前記超電導物質を取り扱っ
ている間に、もう１つの大きな課題があることが判明し
た。However, while the inventors were working with the superconducting materials, it became clear that there was another major problem.
即ち液体窒素中への繰返しドブ漬は試験で、液体窒素か
ら前記超電導物質を大気中に出すと、直ちに同物質の表
面に着霜し、しばらくすると霜が融けて水になり、セラ
ミックス中に浸透する。これを再度液体窒素中に入れる
と直ちに水は氷となり、その際、体積膨張を生起する。That is, repeated immersion in liquid nitrogen was a test, and when the superconducting material was released from liquid nitrogen into the atmosphere, frost immediately formed on the surface of the material, and after a while, the frost melted and turned into water, which penetrated into the ceramic. do. When this water is placed in liquid nitrogen again, the water immediately turns into ice, causing volumetric expansion.
以上の繰り返しで超電導セラミックスは内部から破壊し
ていき、このことは実用化に際して解決すべき重大な課
題である。Repeating the above process destroys the superconducting ceramic from the inside, and this is a serious issue that must be solved before it can be put into practical use.
（課題を解決するための手段）
本発明はこのような課題を解決するために提案されたも
ので、超電導セラミックスの表面にフッ素樹脂を焼付は
塗装することを特徴とする超電導セラミックスの表面処
理方法に係るものである。(Means for Solving the Problems) The present invention was proposed to solve the above problems, and provides a method for surface treatment of superconducting ceramics, which comprises baking or painting a fluororesin on the surface of superconducting ceramics. This is related to.
（作用）
本発明は前記したように、超電導セラミックスの表面に
、液体窒素温度に耐え、耐水性を有するフッ素樹脂を焼
付は塗装することによって、超電導セラミックスの内外
への水分の出入が防止され、大気中の水分の影響が遮断
され、同水分の凍結融解作用による超電導セラミックス
の内部破壊が防止される。(Function) As described above, the present invention prevents moisture from entering and exiting the superconducting ceramic by baking or coating the surface of the superconducting ceramic with a fluororesin that can withstand liquid nitrogen temperatures and has water resistance. The influence of moisture in the atmosphere is blocked, and internal destruction of the superconducting ceramics due to the freezing and thawing effect of the moisture is prevented.
（実施例） 以下本発明を実施例について説明する。(Example) The present invention will be described below with reference to Examples.
Ｙ−Ｂａ−Ｃｕ−０系超電導セラミツクスのエツジ部を
サンドペーパーで研磨し、アセトンによって付着物を除
去し、均一な膜厚が作られるように、スプレーでエアー
圧２．８〜４．２ ｋｇ／ｃｄ程度をかけて、プライマ
ーのＩＯμ霧程度の塗膜を作る。Polish the edges of the Y-Ba-Cu-0 based superconducting ceramics with sandpaper, remove deposits with acetone, and spray with air pressure of 2.8 to 4.2 kg to create a uniform film thickness. /cd to create a coating film about the size of primer IOμ mist.
なおプライマーとしては、例えばデュポン社製、ライン
プライマー（商品名）が使用される。As the primer, for example, Line Primer (trade name) manufactured by DuPont is used.
補記プライマーを自然乾燥、または８２°Ｃ未満の強制
乾燥し、２５０°Ｃで約２０分焼付けたのち空気冷却す
る。・
かくして得られた超電導セラミックスペレット（１）に
均一な膜厚が作られるように、第１図に示す如く、スプ
レー（２）によってエアー圧２．８〜３．５ｋｇ／ｃｄ
程度をかけて、フッ素樹脂系のコーテイング材によるト
ップコートを、前記ペレット（１）のＡ面（表面）及び
Ｂ面（外周面）に３０μｍ程度の塗膜となるように吹付
ける。Supplementary note: The primer is air-dried or forced-dried at a temperature below 82°C, baked at 250°C for about 20 minutes, and then air cooled. - In order to create a uniform film thickness on the superconducting ceramic pellets (1) thus obtained, spray (2) is applied at an air pressure of 2.8 to 3.5 kg/cd, as shown in Figure 1.
A top coat made of a fluororesin coating material is sprayed on the A side (surface) and B side (outer peripheral surface) of the pellet (1) to form a coating film of about 30 μm.
しかるのち５０〜６０°Ｃで強制乾燥をし、３２０°Ｃ
で約３０分焼付けたのち空気冷却する。Then, force dry at 50-60°C, then dry at 320°C.
Bake for about 30 minutes and then cool in the air.
次いで前記ペレット（１）の０面（裏面）に前記同様の
方法でフッ素樹脂系のコーテイング材を吹付け、５０〜
６０°Ｃで強制乾燥したのち３８５°Ｃで約３０分焼付
け、空気冷却する。Next, a fluororesin coating material was sprayed on the 0 side (back side) of the pellet (1) in the same manner as described above, and
After forced drying at 60°C, bake at 385°C for about 30 minutes and cool in air.
なお前記コーテイング材として、デュポン社製のテフロ
ンＰＴＦＥ （商品名）を使用した。Note that Teflon PTFE (trade name) manufactured by DuPont was used as the coating material.
またここで２工程に分けてフッ素樹脂系コーテイング材
を焼付けるのは、焼付けるときペレット（１）の１面が
下になるためで、第１の工程で温度を３２０℃と少し低
い目で生焼きし、第２の工程で３８５°Ｃで本焼きする
ものである。Also, the reason why the fluororesin coating material is baked in two steps is because one side of the pellet (1) will be facing down during baking, so in the first step, the temperature is set at a slightly lower temperature of 320℃. It is first baked raw and then fully baked at 385°C in the second step.
また注意しなければならないのは、前記超電導セラミッ
クスは４００〜５００°Ｃで酸素の出入りが生じ、性質
が変化するため、焼付温度はそれ以下で行なう必要があ
る。It should also be noted that the superconducting ceramics undergoes oxygen inflow and outflow at 400 to 500°C, changing its properties, so the baking temperature must be lower than that.
前記超電導セラミックスに焼付けられるフッ素樹脂は、
−２４０″Ｃ〜２６０°Ｃと低温、高温において耐熱性
を有するため、液体窒素中でも十分性能を保持し、また
撥水性を有するため、水分を超電導セラミックスの内部
に入れず、内部破壊を生じない。The fluororesin baked onto the superconducting ceramics is
It has heat resistance at low and high temperatures of -240"C to 260°C, so it maintains sufficient performance even in liquid nitrogen. It also has water repellency, so moisture does not enter inside the superconducting ceramic and internal destruction does not occur. .
実験の結果、表面処理を施さない超電導セラミックス供
試体が、液体窒素への出し入れで、３日でクラックが生
じるのに対して、本方法で表面処理を施したものは２０
日以上変化しない。As a result of experiments, superconducting ceramic specimens without surface treatment cracked within 3 days when placed in and out of liquid nitrogen, whereas those with surface treatment using this method developed cracks within 3 days.
Does not change for more than a day.
また本方法によればシリコーン系シーリング材によって
表面処理を施した場合に比して均一な膜厚を作ることが
できる。Furthermore, according to this method, a more uniform film thickness can be produced than when surface treatment is performed with a silicone sealant.
（発明の効果）
本発明によればこのように、超電導セラミックスの表面
にフッ素樹脂を焼付けることによって、大気中の水分の
影響を遮断し、同水分の凍結融解作用による超電導セラ
ミックスの内部破壊を防止しうるとともに、超電導セラ
ミックスの大気中での経時変化をも抑止し、耐久性を向
上しうるものである。(Effects of the Invention) According to the present invention, by baking a fluororesin onto the surface of superconducting ceramics, the influence of moisture in the atmosphere is blocked, and internal destruction of superconducting ceramics due to the freezing and thawing action of the moisture is prevented. In addition to preventing this, it also suppresses the aging of superconducting ceramics in the atmosphere and improves its durability.
第１図は本発明に係る超電導セラミックスの表面処理方
法の一実施例の実施状況を示す斜面図である。
（１）−超電導セラミックスペレット
（２）−−−スプレー
代理人 弁理士 岡 本 重 文
外２名
第１図
０面（裏面）FIG. 1 is a perspective view showing an embodiment of the method for surface treatment of superconducting ceramics according to the present invention. (1) - Superconducting ceramic pellets (2) - Spray agent Patent attorney Shigeru Okamoto 2 people Figure 1 page 0 (back side)
Claims (2)
塗装することを特徴とする超電導セラミックスの表面処
理方法。(1) A method for surface treatment of superconducting ceramics, which comprises baking and painting a fluororesin on the surface of superconducting ceramics.
求項１に記載の超電導セラミッ クスの表面処理方法。(2) The method for surface treatment of superconducting ceramics according to claim 1, wherein the baking of the fluororesin is carried out at 400°C or lower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63007537A JPH01183484A (en) | 1988-01-19 | 1988-01-19 | Surface treatment of superconducting ceramic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63007537A JPH01183484A (en) | 1988-01-19 | 1988-01-19 | Surface treatment of superconducting ceramic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01183484A true JPH01183484A (en) | 1989-07-21 |
Family
ID=11668538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63007537A Pending JPH01183484A (en) | 1988-01-19 | 1988-01-19 | Surface treatment of superconducting ceramic |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01183484A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01246106A (en) * | 1988-03-29 | 1989-10-02 | Mitsubishi Mining & Cement Co Ltd | Superconducting oxide material |
| JP2006321668A (en) * | 2005-05-17 | 2006-11-30 | Nippon Steel Corp | Oxide superconductive bulk body and method of manufacturing the same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS647414A (en) * | 1987-06-30 | 1989-01-11 | Toshiba Corp | Superconductive element of oxide type |
| JPS6456385A (en) * | 1987-08-27 | 1989-03-03 | Semiconductor Energy Lab | Oxide superconductive material and its production |
| JPH0196082A (en) * | 1987-10-06 | 1989-04-14 | Mitsubishi Electric Corp | Oxide superconductor |
| JPH01126284A (en) * | 1987-11-10 | 1989-05-18 | Ube Ind Ltd | Stabilized ceramics superconductive at high temperature |
-
1988
- 1988-01-19 JP JP63007537A patent/JPH01183484A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS647414A (en) * | 1987-06-30 | 1989-01-11 | Toshiba Corp | Superconductive element of oxide type |
| JPS6456385A (en) * | 1987-08-27 | 1989-03-03 | Semiconductor Energy Lab | Oxide superconductive material and its production |
| JPH0196082A (en) * | 1987-10-06 | 1989-04-14 | Mitsubishi Electric Corp | Oxide superconductor |
| JPH01126284A (en) * | 1987-11-10 | 1989-05-18 | Ube Ind Ltd | Stabilized ceramics superconductive at high temperature |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01246106A (en) * | 1988-03-29 | 1989-10-02 | Mitsubishi Mining & Cement Co Ltd | Superconducting oxide material |
| JP2006321668A (en) * | 2005-05-17 | 2006-11-30 | Nippon Steel Corp | Oxide superconductive bulk body and method of manufacturing the same |
| JP4673668B2 (en) * | 2005-05-17 | 2011-04-20 | 新日本製鐵株式会社 | Oxide superconducting bulk body and manufacturing method thereof |
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