JPH06295657A - Oxide coated cathode body structure - Google Patents
Oxide coated cathode body structureInfo
- Publication number
- JPH06295657A JPH06295657A JP5100085A JP10008593A JPH06295657A JP H06295657 A JPH06295657 A JP H06295657A JP 5100085 A JP5100085 A JP 5100085A JP 10008593 A JP10008593 A JP 10008593A JP H06295657 A JPH06295657 A JP H06295657A
- Authority
- JP
- Japan
- Prior art keywords
- oxide
- electron tube
- body structure
- cathode body
- reo2
- 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
Landscapes
- Solid Thermionic Cathode (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ブラウン管やマイクロ
波管等の電子管の熱電子放射性陰極として使用される酸
化物陰極構体に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oxide cathode assembly used as a thermionic emission cathode of an electron tube such as a cathode ray tube or a microwave tube.
【０００２】[0002]
【従来の技術】熱電子放射性酸化物陰極では、そこを流
れる電流の密度がその酸化物の層抵抗（厚さ方向の電気
抵抗）により制限されることから、従来では、ニッケル
（Ｎｉ）、モリブデン（Ｍｏ）等の金属粉末を導電材料
として５％〜６０％の割合（重量比）で混合して、層抵
抗を減少させることが行われていた。2. Description of the Related Art In a thermionic emissive oxide cathode, the density of the current flowing therethrough is limited by the layer resistance (electrical resistance in the thickness direction) of the oxide. It has been performed that metal powder such as (Mo) is mixed as a conductive material at a ratio (weight ratio) of 5% to 60% to reduce the layer resistance.
【０００３】図３は電子管に組み込む前の従来のこの種
の酸化物陰極構体の一例の構造を示す図である。１は三
元炭酸塩粒子、２は導電材料としてのニッケル粒子、３
は内側にヒータ（図示せず）が位置するニッケル等から
なるベースメタル（陰極支持体）である。FIG. 3 is a diagram showing the structure of an example of a conventional oxide cathode assembly of this type before being incorporated in an electron tube. 1 is ternary carbonate particles, 2 is nickel particles as a conductive material, 3
Is a base metal (cathode support) made of nickel or the like in which a heater (not shown) is located.
【０００４】このような酸化物陰極構体を製造するため
には、（Ｂａ、Ｃａ、Ｓｒ）ＣＯ3で表される三元炭酸
塩の粉末に、重量比で５％〜６０％のニッケル粉末をバ
インダ（ニトロセルロース）により混合し、ベースメタ
ル３の上面に電着法、吹付法等により約１００μｍの厚
さに被着させていた。上記三元炭酸塩は、電子管への組
み込み時に排気の際の熱分解により酸化物（ＢａＯ、Ｃ
ａＯ、ＳｒＯ）に変えられる。In order to manufacture such an oxide cathode assembly, ternary carbonate powder represented by (Ba, Ca, Sr) CO 3 is mixed with 5% to 60% by weight of nickel powder. It was mixed with a binder (nitrocellulose), and deposited on the upper surface of the base metal 3 to a thickness of about 100 μm by an electrodeposition method, a spraying method, or the like. The above-mentioned ternary carbonate is an oxide (BaO, C) due to thermal decomposition at the time of exhaust when incorporated into an electron tube.
aO, SrO).
【０００５】このようにして製造した陰極構体を電子管
に組み込んで動作させると、層抵抗が小さくなっている
ため、通常の酸化物陰極構体と比較して約１．５倍〜２
倍の高電流密度で安定に動作させることができる。When the cathode assembly manufactured in this manner is incorporated into an electron tube and operated, the layer resistance is small, so that it is about 1.5 times to 2 times that of an ordinary oxide cathode assembly.
It is possible to operate stably with a double high current density.
【０００６】[0006]
【発明が解決しようとする課題】ところが、上記従来の
製造方法による陰極構体では、その製造工程中は空気中
の酸素との反応によりニッケル粒子の表面に酸化膜が形
成され、また組み込み後の動作中は電子管内部に放出さ
れる酸性ガスとの反応により同様の酸化膜が形成され、
これによって抵抗値が増大する傾向があった。この結
果、混入したニッケル粒子の層抵抗を減少させる効果が
経時的に薄れ、熱電子放射特性が不安定になるという問
題があった。However, in the cathode assembly manufactured by the above conventional manufacturing method, an oxide film is formed on the surface of nickel particles during the manufacturing process due to reaction with oxygen in the air, and the operation after the assembly is completed. Inside, a similar oxide film is formed by the reaction with the acidic gas released inside the electron tube,
This tends to increase the resistance value. As a result, there is a problem in that the effect of reducing the layer resistance of the mixed nickel particles is weakened over time and the thermoelectron emission characteristics become unstable.
【０００７】本発明の目的は、上記した問題を解決し、
高電流密度動作が安定して長期間に亙って行われるよう
にした酸化物陰極構体を提供することである。The object of the present invention is to solve the above problems,
It is an object of the present invention to provide an oxide cathode assembly in which high current density operation is stably performed for a long period of time.
【０００８】[0008]
【課題を解決するための手段】このために、本発明の酸
化物陰極構体は、バリウム、カルシウム及びストロンチ
ウムのうち２種以上を含む炭酸塩をベースメタルに被着
させ、該炭酸塩を熱分解させて熱電子放射性酸化物陰極
とした酸化物陰極構体において、上記熱電子放射性酸化
物に対して、ＲｅＯ2 、ＲｅＯ3 、ＲｕＯ2 、ＲｕＯ3
及びＩｒＯ2 から選んだ１種、又は２種以上を、５％〜
５０％だけ含有させて構成した。To this end, in the oxide cathode assembly of the present invention, a carbonate containing two or more of barium, calcium and strontium is deposited on the base metal, and the carbonate is thermally decomposed. in the oxide cathode assembly was thermally emissive oxide cathode by, with respect to the thermal electron emitting oxide, ReO 2, ReO 3, RuO 2, RuO 3
And one or more selected from IrO 2 is 5% to
It was constituted by containing only 50%.
【０００９】[0009]
【作用】本発明の酸化物陰極構体では、ＲｅＯ2 、Ｒｅ
Ｏ3 、ＲｕＯ2 、ＲｕＯ3 及びＩｒＯ2 から選んだ１
種、又は２種以上が導電性物質としてその特性を長期間
に亙って安定的に保持し、高電流密度動作が安定して長
期間に亙って行われるようになる。In the oxide cathode structure of the present invention, ReO 2 , Re
1 selected from O 3 , RuO 2 , RuO 3 and IrO 2
As a conductive substance, one or two or more of them can be stably held for a long period of time, and a high current density operation can be stably performed for a long period of time.
【００１０】[0010]
【実施例】以下に、本発明の実施例について詳しく説明
する。図１はその一実施例の電子管に組み込む前の酸化
物陰極構体の構造を示す図である。前述した図３に示し
たものと同一のものには同一の符号を付した。４は酸化
レニウム（ＲｅＯ2 ）粒子である。EXAMPLES Examples of the present invention will be described in detail below. FIG. 1 is a view showing the structure of an oxide cathode assembly before being incorporated in the electron tube of the embodiment. The same parts as those shown in FIG. 3 described above are designated by the same reference numerals. 4 is a rhenium oxide (ReO 2 ) particle.
【００１１】これを製造するに当たっては、まず、バリ
ウム（Ｂａ）、ストロンチウム（Ｓｒ）、カルシウム
（Ｃａ）、硝酸塩により、アンモン法、ソーダ法によっ
て、（Ｂａ、Ｓｒ、Ｃａ）ＣＯ3 で表される三元炭酸塩
を生成し、この三元炭酸塩粉末と酸化レニウム（ＲｅＯ
2 ）粉末とを２：１の重量比にて混合する。In producing this, first, it is represented by (Ba, Sr, Ca) CO 3 by barium (Ba), strontium (Sr), calcium (Ca) and nitrate by the Ammon method and the soda method. The ternary carbonate is produced, and the ternary carbonate powder and rhenium oxide (ReO 3
2 ) Mix powder with a 2: 1 weight ratio.
【００１２】次に、これらを、ニトロセルロース等から
なるバインダと混合して、これをベースメタル３の上面
に約１００μｍの厚さに電着法、吹付法等により被着さ
せる。そして、この陰極構体を電子管に組み込んでその
電子管を排気する際の熱分解により、上記三元炭酸塩を
酸化物（ＢａＯ、ＣａＯ、ＳｒＯ）に変える。Next, these are mixed with a binder made of nitrocellulose or the like, and this is deposited on the upper surface of the base metal 3 to a thickness of about 100 μm by an electrodeposition method, a spray method or the like. Then, the cathode structure is incorporated into an electron tube, and the ternary carbonate is converted into an oxide (BaO, CaO, SrO) by thermal decomposition when the electron tube is exhausted.
【００１３】このような製法で製作した酸化物陰極構体
を電子管内で動作させると、ＢａＯ、ＣａＯ、ＳｒＯ等
と混合或いは結合した状態の酸化レニウムは非常に安定
であり、動作中に管内で放射されるガスとの反応は全く
無く、且つ比抵抗も１０-6Ω・ｃｍと小さく、更に抵抗
値の温度依存性も小さく、長期間に亙って安定して高い
電流密度動作が行われる。When the oxide cathode assembly manufactured by such a manufacturing method is operated in an electron tube, rhenium oxide mixed or combined with BaO, CaO, SrO, etc. is very stable and radiates in the tube during operation. There is no reaction with the generated gas, the specific resistance is as small as 10 −6 Ω · cm, the temperature dependence of the resistance value is also small, and stable high current density operation is performed for a long period of time.
【００１４】また、酸化レニウムが安定した酸化物であ
るために、従来用いられているニッケル等の金属粉末に
比べて、蒸発量が少なく、電子管内の汚染を抑える効果
もある。更にこの酸化レニウムは、ニッケル等の金属と
比較して二次電子放出率が高いため、マグネトロン等の
二次電子放射を利用した電子管の陰極として好適であ
る。Further, since rhenium oxide is a stable oxide, the amount of evaporation is smaller than that of conventionally used metal powder such as nickel, and the effect of suppressing contamination in the electron tube is also obtained. Further, since rhenium oxide has a higher secondary electron emission rate than metals such as nickel, it is suitable as a cathode of an electron tube utilizing secondary electron emission such as magnetron.
【００１５】この酸化レニウムの酸化物陰極への含有率
と熱電子放射変化率との特性を図２に示す。含有率を増
大するにつれて電子放射が低下しているが、５０％を越
えるとこれが顕著になっている。このように、酸化レニ
ウムの含有率が５０％を越えると本来の熱電子放射性能
の犠牲が大きくなる。実験によれば、５％〜５０％の範
囲において、熱電子放射を犠牲にすることなく層抵抗を
効果的に減少させることができた。The characteristics of the content of rhenium oxide in the oxide cathode and the rate of change of thermionic emission are shown in FIG. Although the electron emission decreases as the content increases, this becomes remarkable when the content exceeds 50%. Thus, if the content of rhenium oxide exceeds 50%, the original thermionic emission performance is largely sacrificed. According to the experiment, in the range of 5% to 50%, the layer resistance could be effectively reduced without sacrificing thermionic emission.
【００１６】なお、上記実施例では、導電材料として酸
化レニウム（ＲｅＯ2 ）を用いたが、ＲｅＯ3 、ＲｕＯ
2 、ＲｕＯ3 、ＩｒＯ2 等を用いても、同様の効果が得
られることは言うまでもない。In the above embodiment, rhenium oxide (ReO 2 ) was used as the conductive material, but ReO 3 and RuO were used.
Needless to say, the same effect can be obtained by using 2 , RuO 3 , IrO 2, or the like.
【００１７】また、（Ｂａ、Ｃａ、Ｓｒ）ＣＯ3 とＲｅ
Ｏ2 等との化合物を形成し、これを酸化物陰極材料とし
た場合も同様の効果が得られる。Further, (Ba, Ca, Sr) CO 3 and Re
Similar effects can be obtained when a compound with O 2 or the like is formed and used as an oxide cathode material.
【００１８】更に、ここでは酸化物陰極材料として（Ｂ
ａ、Ｃａ、Ｓｒ）ＣＯ3 で表される三元炭酸塩を使用し
たが、（Ｂａ、Ｃａ）ＣＯ3 、（Ｂａ、Ｓｒ）ＣＯ3 、
（Ｃａ、Ｓｒ）ＣＯ3 等で表される二元炭酸塩を使用す
ることもできる。Further, as the oxide cathode material (B
The ternary carbonate represented by a, Ca, Sr) CO 3 was used, but (Ba, Ca) CO 3 , (Ba, Sr) CO 3 ,
It is also possible to use a binary carbonate represented by (Ca, Sr) CO 3 .
【００１９】更に、導電材料としてのＲｅＯ2 、ＲｅＯ
3 、ＲｕＯ2 、ＲｕＯ3 、ＩｒＯ2はその１種のみを使
用するのではなく、２種以上を使用しても同様の効果が
得られる。Further, ReO 2 and ReO as conductive materials are used.
With respect to 3 , RuO 2 , RuO 3 , and IrO 2 , the same effect can be obtained by using not only one kind but also two or more kinds.
【００２０】[0020]
【発明の効果】以上説明したように、本願発明によれ
ば、酸化物陰極の層抵抗を減少させるために、ＲｅＯ
2 、ＲｅＯ3 、ＲｕＯ2 、ＲｕＯ3 、ＩｒＯ2 から選択
した１種又は２種以上を混入しているので、電子管内残
留ガス等の影響を受けることなく、安定した低抵抗値を
維持させることができ、長期間に亙って安定した高電流
密度動作を行わせることができるようになるという利点
がある。As described above, according to the present invention, in order to reduce the layer resistance of the oxide cathode, ReO
Since one or more selected from 2 , ReO 3 , RuO 2 , RuO 3 , and IrO 2 are mixed, it is possible to maintain a stable low resistance value without being affected by residual gas in the electron tube. Therefore, there is an advantage that stable high current density operation can be performed over a long period of time.
【図１】 本発明の一実施例の酸化物陰極構体の構造を
示す断面図である。FIG. 1 is a cross-sectional view showing the structure of an oxide cathode assembly according to an embodiment of the present invention.
【図２】 酸化物陰極構体の酸化レニウム含有率に対す
る熱電子放射変化の特性図である。FIG. 2 is a characteristic diagram of changes in thermionic emission with respect to the rhenium oxide content of the oxide cathode assembly.
【図３】 従来の酸化物陰極構体の構造を示す断面図で
ある。FIG. 3 is a cross-sectional view showing a structure of a conventional oxide cathode assembly.
１：炭酸塩粒子、２：ニッケル粒子、３：ベースメタ
ル、４：酸化レニウム粒子。1: Carbonate particles, 2: Nickel particles, 3: Base metal, 4: Rhenium oxide particles.
Claims (1)
ムのうち２種以上を含む炭酸塩を陰極支持体に被着さ
せ、該炭酸塩を熱分解させて熱電子放射性酸化物陰極と
した酸化物陰極構体において、 上記熱電子放射性酸化物に対して、ＲｅＯ2 、ＲｅＯ
3 、ＲｕＯ2 、ＲｕＯ3及びＩｒＯ2 から選んだ１種、
又は２種以上を、重量比で５％〜５０％だけ含有させた
ことを特徴とする酸化物陰極構体。1. An oxide cathode assembly, wherein a carbonate containing two or more of barium, calcium and strontium is applied to a cathode support, and the carbonate is thermally decomposed to form a thermoelectron emitting oxide cathode. For the above thermionic emission oxides, ReO 2 , ReO
One selected from 3 , RuO 2 , RuO 3 and IrO 2 ,
Alternatively, the oxide cathode assembly is characterized by containing two or more kinds in an amount of 5% to 50% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5100085A JPH06295657A (en) | 1993-04-05 | 1993-04-05 | Oxide coated cathode body structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5100085A JPH06295657A (en) | 1993-04-05 | 1993-04-05 | Oxide coated cathode body structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06295657A true JPH06295657A (en) | 1994-10-21 |
Family
ID=14264602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5100085A Pending JPH06295657A (en) | 1993-04-05 | 1993-04-05 | Oxide coated cathode body structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06295657A (en) |
-
1993
- 1993-04-05 JP JP5100085A patent/JPH06295657A/en active Pending
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