JPH01224221A - Preparation of bi-alkaline earth element-cu oxide based high-temperature superconducting ceramic raw material powder - Google Patents
Preparation of bi-alkaline earth element-cu oxide based high-temperature superconducting ceramic raw material powderInfo
- Publication number
- JPH01224221A JPH01224221A JP63045773A JP4577388A JPH01224221A JP H01224221 A JPH01224221 A JP H01224221A JP 63045773 A JP63045773 A JP 63045773A JP 4577388 A JP4577388 A JP 4577388A JP H01224221 A JPH01224221 A JP H01224221A
- Authority
- JP
- Japan
- Prior art keywords
- raw material
- material powder
- alkaline earth
- earth element
- compound
- 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 29
- 239000002994 raw material Substances 0.000 title claims abstract description 26
- 239000000919 ceramic Substances 0.000 title claims abstract description 25
- 150000001875 compounds Chemical class 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 239000005749 Copper compound Substances 0.000 claims abstract description 10
- 150000001880 copper compounds Chemical class 0.000 claims abstract description 10
- 150000001622 bismuth compounds Chemical class 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 230000004907 flux Effects 0.000 abstract description 19
- 239000002245 particle Substances 0.000 abstract description 16
- 239000010949 copper Substances 0.000 abstract description 14
- 229910052788 barium Inorganic materials 0.000 abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052802 copper Inorganic materials 0.000 abstract description 2
- 150000004820 halides Chemical class 0.000 abstract description 2
- 229910052708 sodium Inorganic materials 0.000 abstract description 2
- 238000001354 calcination Methods 0.000 abstract 3
- 238000000354 decomposition reaction Methods 0.000 abstract 1
- 230000004927 fusion Effects 0.000 abstract 1
- 238000002156 mixing Methods 0.000 abstract 1
- 238000005245 sintering Methods 0.000 description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 229910052761 rare earth metal Inorganic materials 0.000 description 4
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 150000002910 rare earth metals Chemical class 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- IATRAKWUXMZMIY-UHFFFAOYSA-N strontium oxide Chemical compound [O-2].[Sr+2] IATRAKWUXMZMIY-UHFFFAOYSA-N 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 229910020012 Nb—Ti Inorganic materials 0.000 description 1
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 1
- 229910001626 barium chloride Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910000416 bismuth oxide Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 235000011148 calcium chloride Nutrition 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 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
- 150000004679 hydroxides Chemical class 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- -1 methanol or ethanol Chemical compound 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 229910001281 superconducting alloy Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Inorganic Compounds Of Heavy Metals (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、Ｂｉ−アルカリ土類元素−Ｃｕ酸化物系超電
導セラミックス原料粉末の調製法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for preparing a Bi-alkaline earth element-Cu oxide superconducting ceramic raw material powder.
（従来技術及びその問題点）
Ｙ−Ｂａ−Ｃｕ−０系に代表される稀土類元素−アルカ
リ土類元素−Ｃｕ酸化物からなる酸素欠損型層状ペロブ
スカイト構造を有する高温超電導セラミックス及びＢ
１−Ｃａ−３ｒ−Ｃｕ−０系に代表されるＢｉ−アルカ
リ土類元素−Ｃｕ酸化物系高温超を環セラミックスは、
交通機関、重電機器、コンピューター、医療機器の多方
面への応用が期待されている。(Prior art and its problems) High-temperature superconducting ceramics having an oxygen-deficient layered perovskite structure consisting of rare earth element-alkaline earth element-Cu oxides represented by Y-Ba-Cu-0 system, and B
Bi-alkaline earth element-Cu oxide-based high-temperature ring ceramics, represented by the 1-Ca-3r-Cu-0 system, are
It is expected to have many applications in transportation, heavy electrical equipment, computers, and medical equipment.
これらの酸化物系超を環セラミックスは、液体窒素のよ
うな安価な冷媒で冷却することによっても超電導状態に
なるため、液体ヘリウム中でしか超を導状態を示さない
Ｎｂ Ｔｉ系超電導合金などの代わりに、超電導マグ
ネットなどに使えれば、経済的に大きなメリットがある
。These oxide-based super-ring ceramics become superconducting when cooled with an inexpensive coolant such as liquid nitrogen, so Nb-Ti-based superconducting alloys, etc., which only exhibit a superconducting state in liquid helium, Instead, if it could be used in things like superconducting magnets, there would be significant economic benefits.
稀土類元素−アルカリ土類元素−Ｃｕ酸化物系高温超電
導セラミックスは、空気中の水分、炭酸ガスによって超
電導特性が損なわれる欠点があり、これは超電導セラミ
ックスの内部構造及び／あるいは化学組成が若干変化す
るためであると推定されている。一方Ｂｉ−アルカリ土
類元素−Ｃｕ酸化物系高温超電導セラミックスは、水分
に対して比較的安定であると言われている。また、稀土
類元素−アルカリ土類元素−Ｃｕ酸化物系高温超電導セ
ラミックスのように高価な稀土類元素を使用しないので
、より実用的である。Rare earth element-alkaline earth element-Cu oxide-based high-temperature superconducting ceramics have the disadvantage that their superconducting properties are impaired by moisture and carbon dioxide in the air, and this is due to slight changes in the internal structure and/or chemical composition of the superconducting ceramics. It is presumed that this is for the purpose of On the other hand, Bi-alkaline earth element-Cu oxide-based high-temperature superconducting ceramics are said to be relatively stable against moisture. Furthermore, it is more practical because it does not use expensive rare earth elements like rare earth element-alkaline earth element-Cu oxide-based high temperature superconducting ceramics.
しかし何れにしても、これまで作られてきた超電導セラ
ミックスは臣冨界電流密度が低く、常電導〜超電導の転
移の温度幅が広く急峻さに欠けているという点も問題で
あった。However, in any case, the superconducting ceramics that have been produced so far have a problem in that they have a low field current density and a wide temperature range of transition from normal conductivity to superconductivity and lack of steepness.
これらの問題点の原因の一つとしては、超電導セラミッ
クスが多孔質で密度が低いことが指摘されている。It has been pointed out that one of the causes of these problems is that superconducting ceramics are porous and have a low density.
これまでＢｉ−アルカリ土類元素−Ｃｕ酸化物系超電導
セラミックスは乾式法で調製した原料粉末を、加圧・焼
結して作られてきた。Until now, Bi-alkaline earth element-Cu oxide based superconducting ceramics have been made by pressurizing and sintering raw material powder prepared by a dry method.
乾式法は、超電導セラミックスの構成成分の酸化物ある
いは炭酸塩の粉末、例えばＢｉｚＯｉ、５ｒＣＯ＋、Ｃ
ａＣ０，、ＣｕＯの粉末を出発原料として、ボールミル
、播潰機あるいは乳棒・乳鉢などで粉砕、混合した後に
焼結して、超電導セラミックスの原料粉末を調製する方
法である。The dry method uses powders of oxides or carbonates of superconducting ceramic components, such as BizOi, 5rCO+, C
In this method, a powder of aC0, CuO is used as a starting material, and the powder is crushed and mixed using a ball mill, a crusher, or a pestle and mortar, and then sintered to prepare a raw material powder for superconducting ceramics.
乾式法は技術的に容易で安全性の高い方法であるが、得
られた原料粉末は、粒径が１〜５μｍ以上と大きく、粒
径分布も均一ではない。また、成分のばらつきも大きい
。Although the dry method is technically easy and highly safe, the obtained raw material powder has a large particle size of 1 to 5 μm or more, and the particle size distribution is not uniform. In addition, there are large variations in the components.
従って、この原料粉末を焼結して作られた裔温超電導セ
ラミックスは密度が低く臨界電流密度も低いという間通
がある。Therefore, it is generally accepted that the superconducting ceramics produced by sintering this raw material powder have a low density and a low critical current density.
（問題点解決のための技術的手段）
本発明は、従来の乾式法の欠点を解決した、易焼結性の
超を環セラミックス原料粉末の調製法である。(Technical Means for Solving Problems) The present invention is a method for preparing an easily sinterable super-ring ceramic raw material powder that solves the drawbacks of the conventional dry method.
本発明は、ビスマス化合物、アルカリ土類元素化合物及
び銅化合物の混合物を仮焼結して、Ｂｉ−アルカリ土類
元素−Ｃｕ酸化物系超電導セラミックス原料粉末を調製
する方法において、前記混合物に融剤が配合されている
ことを特徴とする原料粉末の調製法である。The present invention provides a method for preparing a Bi-alkaline earth element-Cu oxide superconducting ceramic raw material powder by pre-sintering a mixture of a bismuth compound, an alkaline earth element compound, and a copper compound. This is a method for preparing a raw material powder characterized in that the following is blended.
本発明におけるＢｉ−アルカリ土類元素−Ｃｕ酸化物系
高温超電導セラミックスは、次の一般式、Ｂ ｉ＋Ａｘ
Ｃｕ、Ｏｚで表され、式中ＡはＭｇ、Ｃａ、Ｂａ及びＳ
ｒから選択される少なくとも一種類のアルカリ土類元素
を示している。Ａとしては上記アルカリ土類元素の二種
を組み合わせて使用することが好ましく、特に好ましい
のは、ＣａとＳｒの組み合わせである。The Bi-alkaline earth element-Cu oxide-based high-temperature superconducting ceramic in the present invention has the following general formula, Bi+Ax
It is represented by Cu, Oz, where A is Mg, Ca, Ba and S.
At least one kind of alkaline earth element selected from r is shown. As A, it is preferable to use a combination of the above two types of alkaline earth elements, and particularly preferable is a combination of Ca and Sr.
上記式において、１＜ｘ＜４．０．８＜ｙ＜２．５・４
＜ｚ＜７の範囲が好ましい。Ａとしてアルカリ土類元素
の二種を組み合わせて使用する場合、その二種の元素の
組成比は、０．５より大きく、１．５より小さいことが
好ましいが、１付近が特に好ましい。In the above formula, 1<x<4.0.8<y<2.5・4
The range <z<7 is preferable. When two types of alkaline earth elements are used in combination as A, the composition ratio of the two types of elements is preferably larger than 0.5 and smaller than 1.5, and particularly preferably around 1.
本発明において、ビスマス化合物、アルカリ土類元素化
合物、及び銅化合物としては、酸化物、水酸化物、炭酸
塩、硝酸塩などが用いられる。In the present invention, oxides, hydroxides, carbonates, nitrates, etc. are used as the bismuth compound, alkaline earth element compound, and copper compound.
融剤としては、仮焼結温度で融解するが分解しない化合
物が用いられる。このような化合物としては、Ｎａ、に
、Ｂａ、５ｒＸＣａなどのハロゲン化物、特に好ましく
はＮａＣ１、ＢａＣ１゜ＳｒＣ／！２、ＣａＣｌ２、Ｎ
ａＦなどが用いられる。仮焼結においては、これらの融
剤を単独で用いてもよく２種以上併用してもよい。As the flux, a compound that melts at the pre-sintering temperature but does not decompose is used. Such compounds include halides such as Na, Ba, 5rXCa, and particularly preferably NaCl, BaCl°SrC/! 2, CaCl2, N
aF etc. are used. In the preliminary sintering, these fluxes may be used alone or in combination of two or more.
融剤の使用量は、融剤、ビスマス化合物、アルカリ土類
元素化合物、及び銅化合物の混合物に対して、１０〜８
０重量％の範囲であることが好ましく、２０〜７０重景
％の範囲であればより好ましい、融剤の使用量が８０重
量％よりも多いと、仮焼結後の融剤の除去に多大の労力
や時開を要し不経済である。融剤が１０重量％より少な
いと得られた原料粉末の粒子が大きくなったり、粒度分
布が広くなったりする問題がある。The amount of flux to be used is 10 to 8 for the mixture of flux, bismuth compound, alkaline earth element compound, and copper compound.
It is preferably in the range of 0% by weight, more preferably in the range of 20 to 70% by weight. If the amount of flux used is more than 80% by weight, it will take a lot of time to remove the flux after preliminary sintering. It is uneconomical as it requires a lot of labor and time. If the flux is less than 10% by weight, there is a problem that the particles of the obtained raw material powder become large or the particle size distribution becomes wide.
ビスマス化合物、アルカリ土類元素化合物、及び銅化合
物は、ぞれぞれの成分の原子比が、Ｂｉを１としたとき
、アルカリ土類元素が１〜４、銅が０．８〜２．５の範
囲になるように融剤と混合することが好ましい。In the bismuth compound, alkaline earth element compound, and copper compound, the atomic ratio of each component is 1 to 4 for Bi, 1 to 4 for alkaline earth element, and 0.8 to 2.5 for copper. It is preferable to mix the flux with the flux so that it falls within the range of .
ビスマス化合物、アルカリ土類元素化合物、及び銅化合
物と融剤との混合は、同時に行ってもよく、逐次行って
もよい、また、ビスマス化合物、アルカリ土類元素化合
物、及び銅化合物を先に混合しておき、これに融剤を混
合することも可能である。 Ｂｉ化合物、アルカリ土類
元素化合物、及び銅化合物を含む共沈澱物を共沈法など
の方法により調製し、これに融剤を混合してもよい。こ
のようにして得られたビスマス化合物、アルカリ土類元
素化合物、銅化合物及び融剤の混合物を仮焼結する。The bismuth compound, alkaline earth element compound, and copper compound may be mixed with the fluxing agent at the same time or sequentially, or the bismuth compound, alkaline earth element compound, and copper compound may be mixed first. It is also possible to mix a fluxing agent therein. A coprecipitate containing a Bi compound, an alkaline earth element compound, and a copper compound may be prepared by a method such as a coprecipitation method, and a flux may be mixed therein. The mixture of the bismuth compound, alkaline earth element compound, copper compound, and flux thus obtained is pre-sintered.
仮焼結温度は５００ ’Ｃ〜９５０℃、特に７５０°Ｃ
〜９５０°Ｃであることが好ましい。仮焼結温度が５０
０℃より低いと、高温超電導化合物への生成が遅くなる
。仮焼結温度が９５０ ’Ｃより高いと、仮焼結中に粒
子が融屏したり、融剤が昇華したりするので好ましくな
い。Pre-sintering temperature is 500'C to 950°C, especially 750°C
The temperature is preferably 950°C. Preliminary sintering temperature is 50
If the temperature is lower than 0°C, the formation of a high temperature superconducting compound will be slow. If the pre-sintering temperature is higher than 950'C, the particles may melt or the flux may sublimate during the pre-sintering, which is not preferable.
仮焼結は空気あるいは酸素雰囲気で行うことができる。Temporary sintering can be performed in air or oxygen atmosphere.
仮焼結によって得られた原料粉末は融剤を含んでいるた
め、メタノール、エタノール等のアルコールあるいは水
などを用いて充分に洗浄して融剤を除去する。このため
には、仮焼結後の原料粉末をボールミル、播潰機などを
用いて粉砕し、これに上記の融剤除去用の溶媒を加えラ
インミルあるいはラインミキサーによって乳化した後、
連続フィルタープレスによって洗浄する方法などが、好
適に用いられる。Since the raw material powder obtained by preliminary sintering contains a fluxing agent, the fluxing agent is removed by thorough washing with alcohol such as methanol or ethanol, or water. For this purpose, the raw material powder after pre-sintering is pulverized using a ball mill, crusher, etc., the above-mentioned solvent for removing the flux is added thereto, and the mixture is emulsified using a line mill or line mixer.
A method of washing using a continuous filter press is preferably used.
（本発明の効果）
本発明の方法によれば、仮焼結により生成した粒子は融
剤の存在のために、互いに融合して大きな粒子に成長す
ることが抑制される。そのため、粒子径が１μｍ以下で
粒子径の均一な原料粉末を得ることができる。(Effects of the Present Invention) According to the method of the present invention, particles generated by preliminary sintering are prevented from fusing with each other and growing into large particles due to the presence of the flux. Therefore, a raw material powder with a uniform particle size of 1 μm or less can be obtained.
この原料粉末は良好な焼結性をもっており、この原料粉
末を焼結して得られた超電導セラミックスは、従来のも
のに比べ＋’Ｒ界電流密度が、ずっと太き（なっている
。This raw material powder has good sinterability, and the superconducting ceramics obtained by sintering this raw material powder have a much thicker +'R field current density than conventional ones.
（実施例） 以下に本発明の実施例を示す。(Example) Examples of the present invention are shown below.
実施例１
酸化ビスマス（Ｂ １ｚｏｚ）０．１モル、酸化カルシ
ウム（Ｃａｂ）０．１モル、酸化ストロンチウム（Ｓｒ
○）０．１モル、酸化銅（ＣｕＯ）０．２モルをボール
ミルで混合し、これに融剤として塩化バリウム（ＢａＣ
ｊ！ｚ・２Ｈ２０）０゜４８モル、及び塩化ナトリウム
（ＮａＣｌ２）Ｏ。Example 1 Bismuth oxide (B 1zoz) 0.1 mol, calcium oxide (Cab) 0.1 mol, strontium oxide (Sr
0.1 mole of copper oxide (CuO) and 0.2 mole of copper oxide (CuO) were mixed in a ball mill, and barium chloride (BaC
j! z・2H20) 0°48 mol, and sodium chloride (NaCl2)O.
３２モルを加え、混合し、電気炉で８５０°Ｃ３時間仮
焼結した。32 mol was added, mixed, and pre-sintered at 850°C for 3 hours in an electric furnace.
仮焼結後の混合物を播潰機で粉砕し、エタノールを加え
てディスパーザ−で乳化させ、この乳化液を濾過した。The mixture after the temporary sintering was pulverized with a crusher, ethanol was added and emulsified with a disperser, and this emulsion was filtered.
この操作を繰り返して融剤を除去した後、濾過、乾燥し
てＢ １−Ｃａ−３ｒ−Ｃｕ系酸化物超電導セラミック
スの原料粉末を得た。After repeating this operation to remove the flux, it was filtered and dried to obtain a raw material powder for B1-Ca-3r-Cu based oxide superconducting ceramics.
この原料粉末を透過型電子顕微鏡により観察した結果、
粒子径が約０．２５μｍであり粒子径の均一な粒子から
なることが分かった。As a result of observing this raw material powder with a transmission electron microscope,
It was found that the particle size was approximately 0.25 μm, and the particles were uniform in size.
この原料粉末をＩｔ／ｃ１１１で成形し、８８０°Ｃで
２時間焼成したところ、密度５ 、４ ｇ ／ｃｉ、臨
界温度１０５に、臨界電流密度３ Ｂ ＯＡ／ｃｄの超
電導セラミックスが得られた。When this raw material powder was molded at It/c111 and fired at 880°C for 2 hours, a superconducting ceramic with a density of 5.4 g/ci, a critical temperature of 105, and a critical current density of 3 B OA/cd was obtained.
比較例１
融剤を使用しなかった以外は、実施例１と同様の方法を
繰り返してＢ １−Ｃａ−３ｒ−Ｃｕ系酸化物超電導セ
ラミックスの原料粉末を得た。Comparative Example 1 A raw material powder for B1-Ca-3r-Cu-based oxide superconducting ceramics was obtained by repeating the same method as in Example 1, except that no flux was used.
この原料粉末を透過型電子顕微鏡により観察した結果、
粒子径が約１．０μｍであった。As a result of observing this raw material powder with a transmission electron microscope,
The particle size was approximately 1.0 μm.
この原料粉末をｉｔ／ｃｕｔで成形し、８８０ ’Ｃで
２時間焼成したところ、密度５ 、０ ｇ ／ ｃｍ−
、臣冨３温度９０に、臨界電流密度１９０Ａ／ｃ−ｄの
超電導セラミックスが得られた。This raw material powder was molded by it/cut and fired at 880'C for 2 hours, resulting in a density of 5 and 0 g/cm-
A superconducting ceramic having a critical current density of 190 A/c-d was obtained at a temperature of 90°C.
Claims (1)
物の混合物を仮焼結して、Ｂｉ−アルカリ土類元素−Ｃ
ｕ酸化物系超電導セラミックス原料粉末を調製する方法
において、前記混合物に融剤が配合されていることを特
徴とする原料粉末の調製法。A mixture of a bismuth compound, an alkaline earth element compound, and a copper compound is pre-sintered to form Bi-alkaline earth element-C.
A method for preparing raw material powder for u-oxide superconducting ceramics, characterized in that a fluxing agent is blended into the mixture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63045773A JPH01224221A (en) | 1988-03-01 | 1988-03-01 | Preparation of bi-alkaline earth element-cu oxide based high-temperature superconducting ceramic raw material powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63045773A JPH01224221A (en) | 1988-03-01 | 1988-03-01 | Preparation of bi-alkaline earth element-cu oxide based high-temperature superconducting ceramic raw material powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01224221A true JPH01224221A (en) | 1989-09-07 |
Family
ID=12728614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63045773A Pending JPH01224221A (en) | 1988-03-01 | 1988-03-01 | Preparation of bi-alkaline earth element-cu oxide based high-temperature superconducting ceramic raw material powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01224221A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03150225A (en) * | 1989-08-28 | 1991-06-26 | General Electric Co <Ge> | Synthetic production of bi-ca-sr-cu-o superconductor |
-
1988
- 1988-03-01 JP JP63045773A patent/JPH01224221A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03150225A (en) * | 1989-08-28 | 1991-06-26 | General Electric Co <Ge> | Synthetic production of bi-ca-sr-cu-o superconductor |
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