JPH04249022A - Oxide cathode for electronic tube - Google Patents
Oxide cathode for electronic tubeInfo
- Publication number
- JPH04249022A JPH04249022A JP3014134A JP1413491A JPH04249022A JP H04249022 A JPH04249022 A JP H04249022A JP 3014134 A JP3014134 A JP 3014134A JP 1413491 A JP1413491 A JP 1413491A JP H04249022 A JPH04249022 A JP H04249022A
- Authority
- JP
- Japan
- Prior art keywords
- nickel
- molybdenum
- layer
- cathode
- cathode substrate
- 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
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 74
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 35
- 239000000758 substrate Substances 0.000 claims abstract description 24
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 23
- 239000011733 molybdenum Substances 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 9
- DDTIGTPWGISMKL-UHFFFAOYSA-N molybdenum nickel Chemical compound [Ni].[Mo] DDTIGTPWGISMKL-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910000990 Ni alloy Inorganic materials 0.000 claims abstract description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 4
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 239000011572 manganese Substances 0.000 claims description 4
- 229910052726 zirconium Inorganic materials 0.000 claims description 4
- 239000010410 layer Substances 0.000 abstract description 32
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract description 12
- 229910001182 Mo alloy Inorganic materials 0.000 abstract description 8
- 229910000019 calcium carbonate Inorganic materials 0.000 abstract description 6
- NEDFZELJKGZAQF-UHFFFAOYSA-J strontium;barium(2+);dicarbonate Chemical compound [Sr+2].[Ba+2].[O-]C([O-])=O.[O-]C([O-])=O NEDFZELJKGZAQF-UHFFFAOYSA-J 0.000 abstract description 3
- 239000002344 surface layer Substances 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 abstract 2
- 239000000956 alloy Substances 0.000 abstract 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 5
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Inorganic materials [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 3
- 229910052788 barium Inorganic materials 0.000 description 2
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Inorganic materials [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229910000018 strontium carbonate Inorganic materials 0.000 description 2
- IATRAKWUXMZMIY-UHFFFAOYSA-N strontium oxide Chemical compound [O-2].[Sr+2] IATRAKWUXMZMIY-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005240 physical vapour deposition Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Landscapes
- Solid Thermionic Cathode (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は電子管用酸化物カソード
に関し、特にニッケル焼結層又は還元剤が添加されたニ
ッケル焼結層がモリブデン製カソード基板上に配置され
た電子管用酸化物カソードに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oxide cathode for an electron tube, and more particularly to an oxide cathode for an electron tube in which a sintered nickel layer or a sintered nickel layer to which a reducing agent is added is disposed on a cathode substrate made of molybdenum.
【０００２】0002
【従来の技術】従来、電子管用酸化物カソード（以下酸
化物カソードと記す）は、図２に示すように、ニッケル
又はジルコニウム，マンガン等の還元剤が添加されたニ
ッケル製カソード基板５上に炭酸バリウム・ストロンチ
ウムと炭酸カルシウムからなる電子放射物質層４が吹付
けられ、電子管中に組込まれたのち、真空中でニッケル
製カソード基板５背後に設置されたヒータ６により加熱
され、炭酸バリウム・ストロンチウムと炭酸カルシウム
が酸化バリウム・ストロンチウムと酸化カルシウムに還
元され、さらに、酸化バリウムとニッケルの反応により
遊離バリウムを生じさせ、遊離バリウムより電子を放出
させるものである。[Prior Art] Conventionally, an oxide cathode for an electron tube (hereinafter referred to as an oxide cathode) has been produced by depositing carbonate on a nickel cathode substrate 5 to which a reducing agent such as nickel, zirconium, or manganese has been added, as shown in FIG. After the electron emitting material layer 4 consisting of barium strontium and calcium carbonate is sprayed and incorporated into the electron tube, it is heated in a vacuum by a heater 6 installed behind the nickel cathode substrate 5, and barium strontium carbonate and calcium carbonate are formed. Calcium carbonate is reduced to barium/strontium oxide and calcium oxide, and further, free barium is generated by the reaction of barium oxide and nickel, and electrons are released from the free barium.
【０００３】近年速動型カソードとして図３に示すよう
に、カソード基板をモリブデン製とし、モリブデン製カ
ソード基板１上にニッケル粒子を吹付け、焼結させてニ
ッケル焼結層３を形成し、さらに、炭酸バリウム・スト
ロンチウムと炭酸カルシウムを吹付けて電子放射物質層
４を形成した酸化物カソードが用いられてきた。このモ
リブデンを基板とする酸化物カソードは、モリブデンの
熱伝導率がニッケルよりはるかに大きいため、ヒータ点
火からカソードが動作温度に達するまでの時間を短縮で
きるというメリットがある。In recent years, as shown in FIG. 3, a fast-acting cathode has been developed in which the cathode substrate is made of molybdenum, nickel particles are sprayed onto the molybdenum cathode substrate 1 and sintered to form a nickel sintered layer 3. , an oxide cathode in which an electron emitting material layer 4 is formed by spraying barium/strontium carbonate and calcium carbonate has been used. An oxide cathode using molybdenum as a substrate has the advantage of shortening the time from heater ignition until the cathode reaches operating temperature, since molybdenum has a much higher thermal conductivity than nickel.
【０００４】0004
【発明が解決しようとする課題】この従来のモリブデン
製カソード基板を使用した酸化物カソードでは、加熱，
冷却といった熱ショックによりモリブデン製カソード基
板上のニッケル焼結層がはがれるという欠点を有してい
た。[Problems to be Solved by the Invention] In this conventional oxide cathode using a molybdenum cathode substrate, heating,
The drawback was that the nickel sintered layer on the molybdenum cathode substrate peeled off due to thermal shock caused by cooling.
【０００５】この欠点を防止するため、モリブデン製カ
ソード基板表面をサンドブラスト等により凸凹にしてニ
ッケル焼結層との接触面積を増加させていたが充分では
なかった。In order to prevent this drawback, the surface of the molybdenum cathode substrate has been made uneven by sandblasting or the like to increase the contact area with the nickel sintered layer, but this has not been sufficient.
【０００６】本発明の目的は、ニッケル焼結層のはがれ
のない酸化物カソードを提供することにある。An object of the present invention is to provide an oxide cathode in which the nickel sintered layer does not peel off.
【０００７】[0007]
【課題を解決するための手段】本発明は、モリブデン製
カソード基板上にニッケルと、ジルコニウムとマンガン
を含む還元剤が添加されたニッケルとのうちのいずれか
一方の焼結層が配置され、該焼結層上に電子放射物質が
被覆された電子管用酸化物カソードにおいて、前記モリ
ブデン製カソード基板と前記焼結層との間にモリブデン
・ニッケル合金層が形成されている。[Means for Solving the Problems] The present invention provides a method in which a sintered layer of either nickel or nickel to which a reducing agent containing zirconium and manganese is added is disposed on a cathode substrate made of molybdenum. In an oxide cathode for an electron tube in which a sintered layer is coated with an electron emitting material, a molybdenum-nickel alloy layer is formed between the molybdenum cathode substrate and the sintered layer.
【０００８】[0008]
【実施例】次に、本発明の実施例について図面を参照し
て説明する。Embodiments Next, embodiments of the present invention will be described with reference to the drawings.
【０００９】図１は本発明の一実施例の要部断面図であ
る。FIG. 1 is a sectional view of a main part of an embodiment of the present invention.
【００１０】図１に示すように、まず、モリブデン製カ
ソード基板１の電子放射面側のみにニッケルを３μｍの
厚さにめっきした後、還元性雰囲気中で１，３００℃に
加熱することでめっきしたニッケルとモリブデン製カソ
ード基板１の表面層を溶融，合金化させたニッケル・モ
リブデン合金層２を形成する。As shown in FIG. 1, first, only the electron emitting surface side of the molybdenum cathode substrate 1 is plated with nickel to a thickness of 3 μm, and then the plating is completed by heating to 1,300° C. in a reducing atmosphere. A nickel-molybdenum alloy layer 2 is formed by melting and alloying the nickel and the surface layer of the molybdenum cathode substrate 1.
【００１１】次に、ニッケル・モリブデン合金層２上に
平均粒径１０μｍのニッケル粉末を３０μｍの厚さに吹
付けた後、還元性雰囲気中で１，２００℃に加熱するこ
とでニッケル焼結層３を形成する。Next, nickel powder with an average particle size of 10 μm is sprayed onto the nickel-molybdenum alloy layer 2 to a thickness of 30 μm, and then heated to 1,200° C. in a reducing atmosphere to form a sintered nickel layer. form 3.
【００１２】さらに、炭酸バリウム・ストロンチウムと
炭酸カルシウムからなる電子放射物質を吹き付けて電子
放射物質層４を形成する。Furthermore, an electron emitting material layer 4 is formed by spraying an electron emitting material made of barium/strontium carbonate and calcium carbonate.
【００１３】本実施例では、ニッケル・モリブデン合金
層２を形成するニッケルは、モリブデン製カソード基板
１上にめっきしたが、物理蒸着，化学蒸着等の方法でモ
リブデン製カソード基板１上に被着してもよい。又、本
実施例ではニッケル焼結層３はニッケルのみからなるが
、ジルコニウム，マンガン等の還元剤を添加したニッケ
ルであってもよい。In this example, nickel forming the nickel-molybdenum alloy layer 2 was plated on the cathode substrate 1 made of molybdenum, but nickel was deposited on the cathode substrate 1 made of molybdenum by a method such as physical vapor deposition or chemical vapor deposition. It's okay. Further, in this embodiment, the nickel sintered layer 3 is made of only nickel, but it may be made of nickel to which a reducing agent such as zirconium or manganese is added.
【００１４】なお、図１ではヒータ及びカソード支持構
造は省略した。In FIG. 1, the heater and cathode support structure are omitted.
【００１５】[0015]
【発明の効果】以上説明したように本発明は、モリブデ
ン製カソード基板上にニッケル焼結層が配置された酸化
物カソードにおいて、モリブデン製カソード基板とニッ
ケル焼結層の間にニッケル・モリブデン合金層が形成さ
れているので、従来の酸化物カソードで生じていたニッ
ケル焼結層のはがれを防止できるという効果がある。As explained above, the present invention provides an oxide cathode in which a nickel sintered layer is arranged on a molybdenum cathode substrate, and a nickel-molybdenum alloy layer is provided between the molybdenum cathode substrate and the nickel sintered layer. is formed, which has the effect of preventing the peeling off of the nickel sintered layer that occurs in conventional oxide cathodes.
【図１】本発明の一実施例の要部断面図である。FIG. 1 is a sectional view of a main part of an embodiment of the present invention.
【図２】従来の酸化物カソードの一例の要部断面図であ
る。FIG. 2 is a sectional view of a main part of an example of a conventional oxide cathode.
【図３】従来の酸化物カソードの他の例の要部断面図で
ある。FIG. 3 is a sectional view of a main part of another example of a conventional oxide cathode.
１ モリブデン製カソード基板
２ ニッケル・モリブデン合金層３ ニッ
ケル焼結層
４ 電子放射物質層
５ ニッケル製カソード基板
６ ヒータ1 Molybdenum cathode substrate 2 Nickel-molybdenum alloy layer 3 Nickel sintered layer 4 Electron emissive material layer 5 Nickel cathode substrate 6 Heater
Claims (1)
ルと、ジルコニウムとマンガンを含む還元剤が添加され
たニッケルとのうちのいずれか一方の焼結層が配置され
、該焼結層上に電子放射物質が被覆された電子管用酸化
物カソードにおいて、前記モリブデン製カソード基板と
前記焼結層との間にモリブデン・ニッケル合金層が形成
されたことを特徴とする電子管用酸化物カソード。1. A sintered layer of either nickel or nickel to which a reducing agent containing zirconium and manganese is added is disposed on a molybdenum cathode substrate, and an electron emitting material is disposed on the sintered layer. What is claimed is: 1. An oxide cathode for an electron tube coated with molybdenum, characterized in that a molybdenum-nickel alloy layer is formed between the molybdenum cathode substrate and the sintered layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3014134A JPH04249022A (en) | 1991-02-05 | 1991-02-05 | Oxide cathode for electronic tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3014134A JPH04249022A (en) | 1991-02-05 | 1991-02-05 | Oxide cathode for electronic tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04249022A true JPH04249022A (en) | 1992-09-04 |
Family
ID=11852668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3014134A Pending JPH04249022A (en) | 1991-02-05 | 1991-02-05 | Oxide cathode for electronic tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04249022A (en) |
-
1991
- 1991-02-05 JP JP3014134A patent/JPH04249022A/en active Pending
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