JPH11322439A - Ceramics sheet - Google Patents
Ceramics sheetInfo
- Publication number
- JPH11322439A JPH11322439A JP10127411A JP12741198A JPH11322439A JP H11322439 A JPH11322439 A JP H11322439A JP 10127411 A JP10127411 A JP 10127411A JP 12741198 A JP12741198 A JP 12741198A JP H11322439 A JPH11322439 A JP H11322439A
- Authority
- JP
- Japan
- Prior art keywords
- oxide powder
- ceramic sheet
- sheet
- powder
- oxide
- 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.)
- Withdrawn
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 26
- 239000000843 powder Substances 0.000 claims abstract description 33
- 239000011230 binding agent Substances 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 239000002245 particle Substances 0.000 claims abstract description 5
- 239000002887 superconductor Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 4
- 230000004927 fusion Effects 0.000 abstract description 5
- 238000009792 diffusion process Methods 0.000 abstract description 4
- 229920002678 cellulose Polymers 0.000 abstract description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 abstract 2
- 229910018404 Al2 O3 Inorganic materials 0.000 abstract 1
- 235000010980 cellulose Nutrition 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 19
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 6
- 229910052709 silver Inorganic materials 0.000 description 6
- 239000004332 silver Substances 0.000 description 6
- 238000004804 winding Methods 0.000 description 6
- 239000000470 constituent Substances 0.000 description 5
- 125000006850 spacer group Chemical group 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 235000012771 pancakes Nutrition 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000010292 electrical insulation Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002035 prolonged effect Effects 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
Landscapes
- Superconductors And Manufacturing Methods Therefor (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はセラミックスシート
に係り、詳しくは高温で熱処理が施される金属または合
金の線間、層間に配置される電気的絶縁性、拡散遮蔽性
および形状保持性に優れ、特に酸化物超電導ケーブルや
酸化物超電導コイルに好適するセラミックスシートに関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic sheet, and more particularly to a sheet or sheet of metal or alloy which is subjected to heat treatment at a high temperature and has excellent electrical insulation, diffusion shielding and shape retention properties. More particularly, the present invention relates to a ceramic sheet suitable for an oxide superconducting cable and an oxide superconducting coil.
【０００２】[0002]
【従来の技術】従来、酸化物超電導線材としては銀シー
ス法によるものが一般的に知られており、これは銀また
は銀基合金マトリッス中に多数本の酸化物超電導フィメ
ントを配置したものである。このような線材は、銀また
は銀基合金マトリックス中に焼成により超電導酸化物を
形成する物質からなるフィラメントを配置し、次いで所
望形状に成型加工した後、焼成のための熱処理を施すこ
とにより製造されており、この熱処理は高温で長時間施
される。2. Description of the Related Art Conventionally, a silver sheath method is generally known as an oxide superconducting wire, in which a large number of oxide superconducting filaments are arranged in a silver or silver-based alloy matrix. . Such a wire is manufactured by arranging a filament made of a material that forms a superconducting oxide by firing in a silver or silver-based alloy matrix, forming the filament into a desired shape, and then performing a heat treatment for firing. This heat treatment is performed at a high temperature for a long time.
【０００３】この熱処理は、長尺線材の場合、セラミッ
クス製の巻枠にソレノイド状に巻きつけて熱処理炉中に
収容して行われている。しかしながら、この方法では、
線材の長尺化に伴って熱処理炉も大型化する必要があ
り、製造コストが上昇する上、熱処理炉内の温度の不均
一等により超電導特性の低下を招くことになる。[0003] In the case of a long wire, this heat treatment is carried out by winding it around a ceramic winding frame in the form of a solenoid and housing it in a heat treatment furnace. However, in this method,
It is necessary to increase the size of the heat treatment furnace as the length of the wire becomes longer, which increases the manufacturing cost and causes a decrease in superconductivity due to uneven temperature in the heat treatment furnace.
【０００４】このような問題を解決するため、線材を同
心円状（いわゆるパンケーキ状）に巻回して熱処理を施
すことが行われている。しかし、パンケーキ状に線材を
巻回して熱処理を施す場合、隣接する線材間が融着し、
超電導線としての使用が不可能になる。この線材間の融
着を防止するために、線材間に耐熱性のスペーサーを配
置する必要がある。このようなスペーサーとして耐熱紙
が挙げられるが、この耐熱紙はＡｌ2Ｏ3とＳｉＯ2を主
成分とするものであり、これらの構成元素と酸化物超電
導体との反応性が高いため，線材表面および酸化物超電
導フィラメント中に不純物が生成し、製品の外観を著し
く損ねるばかりか超電導特性の低下をもたらす。In order to solve such a problem, it has been practiced to heat the wire by winding it in a concentric shape (so-called pancake shape). However, when heat treatment is performed by winding a wire in a pancake shape, adjacent wires are fused together,
Use as a superconducting wire becomes impossible. In order to prevent the fusion between the wires, it is necessary to arrange a heat-resistant spacer between the wires. As such a spacer, heat-resistant paper is cited. This heat-resistant paper is mainly composed of Al 2 O 3 and SiO 2 , and has high reactivity between these constituent elements and the oxide superconductor. Impurities are formed on the surface and in the oxide superconducting filament, which not only significantly impairs the appearance of the product, but also degrades superconducting properties.
【０００５】上記の耐熱紙の代りに、酸化物超電導体の
構成元素と反応性の小さいＭｇＯ等のセラミックスのペ
ーストを直接塗布する方法も行われているが、この場
合、熱処理後に除去することができず、端末処理等に著
しい不具合を生ずる結果となる。[0005] Instead of the above heat-resistant paper, a method of directly applying a paste of ceramics such as MgO having low reactivity with the constituent elements of the oxide superconductor is also performed. Cannot be performed, resulting in a remarkable trouble in terminal processing and the like.
【０００６】[0006]
【発明が解決しようとする課題】本発明は以上の問題を
解決するためになされたもので、酸化物超電導体と高温
で非反応性のセラミックスシートを提供することをその
目的とする。また、本発明は、電気的絶縁性、拡散遮蔽
性および形状保持性に優れたセラミックスシートを提供
することをその目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a ceramic sheet which is non-reactive at a high temperature with an oxide superconductor. Another object of the present invention is to provide a ceramic sheet having excellent electrical insulation, diffusion shielding properties and shape retention.
【０００７】本発明は、特に酸化物超電導体生成の高温
で長時間の焼成のための熱処理時に、線材間、層間また
は他の金属との間に配置してその融着を防止し、かつハ
ンドリングに耐える強度を有するとともに機械による巻
線作業が可能なセラミックスシートを提供することをそ
の目的とする。[0007] The present invention is to dispose between the wires, between layers or between other metals to prevent the fusion, and to handle, especially during the heat treatment for the prolonged firing at a high temperature for forming the oxide superconductor. It is an object of the present invention to provide a ceramic sheet which has strength enough to withstand the temperature and can be wound by a machine.
【０００８】[0008]
【課題を解決するための手段】以上の目的を達成するた
めに、本発明の第１のセラミックスシートは、酸化物超
電導体と高温で非反応性の粉末と有機バインダーを含む
シートであって、この粉末は粒状の酸化物粉末を主成分
とし、これに繊維状の酸化物粉末を混合した混合物より
なるものである。To achieve the above object, a first ceramic sheet of the present invention is a sheet containing an oxide superconductor, a non-reactive powder at a high temperature and an organic binder, This powder is composed of a mixture of a particulate oxide powder as a main component and a fibrous oxide powder mixed therewith.
【０００９】また、本発明の第２のセラミックスシート
は、酸化物超電導体と高温で非反応性の粉末と有機バイ
ンダーを含むスシートであって、このシートは、粒状の
酸化物粉末３５〜４５ｗｔ％と繊維状の酸化物粉末１５
〜２５ｗｔ％の混合物およびセルロース系有機バインダ
ー３０〜５０ｗｔ％からなるものである。粒状の酸化物
粉末および繊維状の酸化物粉末の配合量を上記のように
限定したのは以下の理由による。Further, the second ceramic sheet of the present invention is a sheet containing an oxide superconductor, a non-reactive powder at a high temperature, and an organic binder. And fibrous oxide powder 15
-25% by weight of a mixture and 30-50% by weight of a cellulosic organic binder. The mixing amounts of the granular oxide powder and the fibrous oxide powder are limited as described above for the following reasons.
【００１０】即ち、粒状の酸化物粉末の量が３５ｗｔ％
未満であると、超電導体と高温で非反応性の粉末の量が
少なくなり、繊維状の酸化物粉末と超電導体とが反応し
て超電導特性の低下を招き、また粒状の酸化物粉末が４
５ｗｔ％を越えると、繊維状の酸化物粉末の量が少なく
なってブリッジ効果が小さくなり、熱処理後に脱落して
しまいスペーサーとしての役目を果さなくなる。That is, the amount of the granular oxide powder is 35 wt%
If it is less than the amount, the amount of the non-reactive powder at a high temperature with the superconductor becomes small, and the fibrous oxide powder reacts with the superconductor to cause a decrease in superconducting properties.
If the content exceeds 5 wt%, the amount of the fibrous oxide powder is reduced, and the bridging effect is reduced. The bridging effect drops off after the heat treatment and does not serve as a spacer.
【００１１】一方、繊維状の酸化物粉末の量が１５ｗｔ
％未満であるとブリッジ効果が小さくなり、２５ｗｔ％
を越えると超電導体との反応が生じ易くなる。また、セ
ルロース系有機バインダーは、粒状および繊維状の酸化
物粉末をシート状に加工するために加えられ、その配合
量は３０〜５０ｗｔ％の範囲が好ましい。有機バインダ
ーの量が３０ｗｔ％未満であると、引張り強さが低下し
て機械による巻線作業が不可能となり、５０ｗｔ％を越
えると、熱処理時に過剰な有機バインダーのガスが発生
して低酸素雰囲気となり、また超電導体内に炭素が侵入
することにより、超電導特性が低下するとともに、熱処
理後に粉末の脱落が生じ易くなる。On the other hand, the amount of fibrous oxide powder is 15 wt.
%, The bridging effect is reduced, and 25 wt%
If the ratio exceeds, a reaction with the superconductor is likely to occur. The cellulosic organic binder is added in order to process the granular and fibrous oxide powder into a sheet, and the amount thereof is preferably in the range of 30 to 50 wt%. If the amount of the organic binder is less than 30 wt%, the tensile strength is reduced and the winding operation by a machine becomes impossible. In addition, the penetration of carbon into the superconductor lowers the superconducting properties and makes it easier for the powder to fall off after the heat treatment.
【００１２】[0012]
【発明の実施の形態】以下、本発明の実施の形態につい
て説明する。 （イ）粒径φ０．１〜１０μｍのＺｒＯ2、ＭｇＯまた
はＹ2Ｏ3等のいずれか１種以上からなる酸化物粉末の３
５〜４５ｗｔ％と、（ロ）外径φ１〜１０μｍでかつ長
さ１０〜５００μｍのＡｌ2Ｏ3等からなる繊維状の酸化
物粉末の１５〜２５ｗｔ％を混合し、この混合物に
（ハ）セルロース系有機バインダーの３０〜５０ｗｔ％
を加えて、厚さ１０〜３００μｍに加工してセラミック
スシートを作成した。Embodiments of the present invention will be described below. (A) oxide powder 3 composed of any one or more of ZrO 2 , MgO, Y 2 O 3 and the like having a particle size of φ0.1 to 10 μm;
5 to 45 wt% and (b) 15 to 25 wt% of a fibrous oxide powder made of Al 2 O 3 or the like having an outer diameter of 1 to 10 μm and a length of 10 to 500 μm are mixed. 30-50 wt% of cellulosic organic binder
And processed to a thickness of 10 to 300 μm to form a ceramic sheet.
【００１３】このシートは、任意の大きさに加工するこ
とができ、テープ状に加工することも容易であり、ハン
ドリングおよび機械による巻き取り作業に耐えるだけの
十分な強度を有する。また、このシートは、熱処理時の
線材間の融着を防止するためのスペーサーとして使用し
た場合、熱処理時の線材の伸縮に対応してその形状を保
持する。即ち、熱処理時に起こる線材の伸縮に対応して
その形状を保持するＡｌ2Ｏ3 等の酸化物長繊維で形成
されるネットワークの中に、高温で超電導体と非反応性
のＭｇＯ等からなる酸化物粉末が充填されるため、熱処
理時に超電導体と反応せず超電導体の構成元素の欠乏や
線材表面に不純物が付着することが防止できる。This sheet can be processed into an arbitrary size, can be easily processed into a tape shape, and has sufficient strength to withstand handling and winding by a machine. When this sheet is used as a spacer for preventing fusion between wires during heat treatment, the sheet retains its shape corresponding to the expansion and contraction of the wire during heat treatment. In other words, in a network formed by long oxide fibers such as Al 2 O 3 that maintain the shape corresponding to the expansion and contraction of the wire that occurs during the heat treatment, the oxidation of MgO or the like that is non-reactive with the superconductor at high temperature. Since the material powder is filled, it does not react with the superconductor during the heat treatment, so that it is possible to prevent deficiency of constituent elements of the superconductor and adhesion of impurities to the surface of the wire.
【００１４】[0014]
【実施例】以下、本発明の一実施例および比較例につい
て説明する。 実施例 粒径φ１μｍ以下のＭｇＯからなる粒状の酸化物粉末
と、外径φ１μｍ以下でかつ長さ１００〜２００μｍの
範囲の繊維状の酸化物粉末およびセルロース系有機バイ
ンダーを表１に示す配合比で配合して、厚さ０．２ｍ
ｍ、幅４ｍｍのセラミックスシートを作成した。EXAMPLES Examples and comparative examples of the present invention will be described below. Example A particulate oxide powder composed of MgO having a particle diameter of φ1 μm or less, a fibrous oxide powder having an outer diameter of φ1 μm or less and a length in a range of 100 to 200 μm, and a cellulose-based organic binder in a compounding ratio shown in Table 1 0.2m thick
m, a ceramic sheet having a width of 4 mm was prepared.
【００１５】[0015]
【表１】 [Table 1]
【００１６】一方、厚さ０．２ｍｍ、幅３．０ｍｍの銀
マトリックス中に、Ｂｉ（２２２３）超電導体の構成元
素からなるフィラメントの５５本を配置したテープ状線
材を作成し、このテープ状線材の層間に上記のセラミッ
クスシートを配置してパンケーキ状に６００回巻いてコ
イルを形成した。このコイルに酸化物超電導体生成の熱
処理を、酸化性雰囲気中で８４０℃×１５０時間施して
テープ状超電導線を製造した。On the other hand, a tape-shaped wire having 55 filaments composed of the constituent elements of the Bi (2223) superconductor is prepared in a silver matrix having a thickness of 0.2 mm and a width of 3.0 mm. The above-mentioned ceramic sheet was arranged between the layers and rolled into a pancake shape 600 times to form a coil. The coil was subjected to a heat treatment for forming an oxide superconductor in an oxidizing atmosphere at 840 ° C. for 150 hours to produce a tape-shaped superconducting wire.
【００１７】このセラミックスシートの引張り強さおよ
び超電導線の臨界電流密度を測定した結果を表１に同時
に示した。 比較例 実施例と同一の粉末を使用して、表２に示す配合比で厚
さ０．２ｍｍ、幅４ｍｍのセラミックスシートを作成し
た。Table 1 also shows the results of measuring the tensile strength of the ceramic sheet and the critical current density of the superconducting wire. Comparative Example A ceramic sheet having a thickness of 0.2 mm and a width of 4 mm was prepared at the compounding ratio shown in Table 2 using the same powder as in the example.
【００１８】[0018]
【表２】 [Table 2]
【００１９】このセラミックスシートを用いて、実施例
と同様の方法でコイルを形成し、実施例と同一の条件で
テープ状超電導線を製造し、その引張り強さおよび臨界
電流密度を測定した。その結果を表２に同時に示した。Using this ceramic sheet, a coil was formed in the same manner as in the example, a tape-shaped superconducting wire was manufactured under the same conditions as in the example, and its tensile strength and critical current density were measured. The results are shown in Table 2 at the same time.
【００２０】[0020]
【発明の効果】以上の説明で明らかなように、本発明の
セラミックスシートは、形状保持性があるため、線材間
等の融着を防止することができる。また、超電導体と非
反応性であるため、熱処理時に線材間に配置して超電導
体の構成元素の欠乏を防止することができ、超電導特性
およびその均一性を向上させることができる。また、こ
の際の超電導線表面の不純物の付着も防止できる。As is clear from the above description, since the ceramic sheet of the present invention has a shape-retaining property, it is possible to prevent fusion between wires and the like. In addition, since it is non-reactive with the superconductor, it can be arranged between the wires during heat treatment to prevent the deficiency of the constituent elements of the superconductor, and the superconductivity and uniformity thereof can be improved. At this time, the adhesion of impurities on the surface of the superconducting wire can be prevented.
【００２１】本発明のセラミックスシートは、熱処理時
に線材間、層間または他の金属との間に配置するスペー
サー、ワインド・アンド・リアクト法で超電導体コイル
製造する際の絶縁紙、または他の金属との間に配置して
熱処理を施す際の拡散障壁として使用することに適す
る。The ceramic sheet of the present invention may be a spacer disposed between wires, between layers or between other metals during heat treatment, an insulating paper for producing a superconducting coil by a wind-and-react method, or other metal. It is suitable to be used as a diffusion barrier when heat treatment is performed by disposing between them.
Claims (5)
有機バインダーを含むセラミックスシートであって、前
記粉末は粒状の酸化物粉末を主成分とし、これに繊維状
の酸化物粉末を混合した混合物よりなることを特徴とす
るセラミックスシート。1. A ceramic sheet comprising an oxide superconductor, a non-reactive powder at a high temperature and an organic binder, said powder comprising a particulate oxide powder as a main component, and a fibrous oxide powder added thereto. A ceramic sheet comprising a mixed mixture.
有機バインダーを含むセラミックスシートであって、前
記シートは、粒状の酸化物粉末３５〜４５ｗｔ％と繊維
状の酸化物粉末１５〜２５ｗｔ％の混合物およびセルロ
ース系有機バインダー３０〜５０ｗｔ％からなることを
特徴とするセラミックスシート。2. A ceramic sheet comprising an oxide superconductor, a non-reactive powder at a high temperature and an organic binder, said sheet comprising 35 to 45% by weight of a particulate oxide powder and 15 to 45% by weight of a fibrous oxide powder. A ceramic sheet comprising 25 wt% of a mixture and 30 to 50 wt% of a cellulosic organic binder.
ｍ、繊維状の酸化物粉末は外径φ１〜１０μｍでかつ長
さ１０〜５００μｍであることを特徴とする請求項１ま
たは２記載のセラミックスシート。3. The particulate oxide powder has a particle size of φ0.1 to 10 μm.
3. The ceramic sheet according to claim 1, wherein the fibrous oxide powder has an outer diameter φ1 to 10 μm and a length 10 to 500 μm.
はＹ2Ｏ3のいずれか１種以上からなり、繊維状の酸化物
粉末はＡｌ2Ｏ3からなることをことを特徴とする請求項
１乃至３いずれか１項記載のセラミックスシート。4. The method according to claim 1, wherein the granular oxide powder comprises at least one of ZrO 2 , MgO and Y 2 O 3 , and the fibrous oxide powder comprises Al 2 O 3. Item 4. The ceramic sheet according to any one of Items 1 to 3.
ことをことを特徴とする請求項１乃至４いずれか１項記
載のセラミックスシート。5. The ceramic sheet according to claim 1, wherein the thickness of the sheet is from 10 to 300 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10127411A JPH11322439A (en) | 1998-05-11 | 1998-05-11 | Ceramics sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10127411A JPH11322439A (en) | 1998-05-11 | 1998-05-11 | Ceramics sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11322439A true JPH11322439A (en) | 1999-11-24 |
Family
ID=14959315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10127411A Withdrawn JPH11322439A (en) | 1998-05-11 | 1998-05-11 | Ceramics sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11322439A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003023872A1 (en) * | 2001-09-10 | 2003-03-20 | Industrial Research Limited | Parting agents for metal-clad high-temperature superconductor wires and tapes |
| US8158035B2 (en) * | 2006-12-27 | 2012-04-17 | Kao Corporation | Light diffusing member with ceramic particles containing magnesium oxide and aluminum oxide |
-
1998
- 1998-05-11 JP JP10127411A patent/JPH11322439A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003023872A1 (en) * | 2001-09-10 | 2003-03-20 | Industrial Research Limited | Parting agents for metal-clad high-temperature superconductor wires and tapes |
| US8158035B2 (en) * | 2006-12-27 | 2012-04-17 | Kao Corporation | Light diffusing member with ceramic particles containing magnesium oxide and aluminum oxide |
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