JPH08298076A - Impregnation type cathode body structure - Google Patents
Impregnation type cathode body structureInfo
- Publication number
- JPH08298076A JPH08298076A JP10425695A JP10425695A JPH08298076A JP H08298076 A JPH08298076 A JP H08298076A JP 10425695 A JP10425695 A JP 10425695A JP 10425695 A JP10425695 A JP 10425695A JP H08298076 A JPH08298076 A JP H08298076A
- Authority
- JP
- Japan
- Prior art keywords
- electron
- impregnated
- electron emission
- moisture
- emitting substance
- 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
- Electrodes For Cathode-Ray Tubes (AREA)
- Solid Thermionic Cathode (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、酸化物を有する電子放
射物質を含浸した含浸型陰極構体に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impregnated type cathode assembly impregnated with an electron emitting material having an oxide.
【０００２】[0002]
【従来の技術】従来、例えば、特開平４−１７４９３７
号公報に記載された含浸型陰極構体が知られている。こ
の種の含浸型陰極構体は、電子管に用いられるもので、
例えば、炭酸バリウムを主成分とした電子放射物質を大
気雰囲気中で高温処理して酸化物化したのち、この電子
放射物質を多孔質タングステンからなる基体に水素雰囲
気中で含浸して構成されている。2. Description of the Related Art Conventionally, for example, Japanese Patent Laid-Open No. 4-174937.
The impregnated-type cathode assembly described in Japanese Patent Publication is known. This type of impregnated cathode structure is used for electron tubes.
For example, an electron emitting substance mainly containing barium carbonate is subjected to a high temperature treatment in an air atmosphere to be oxidized, and then the substrate made of porous tungsten is impregnated with this electron emitting substance in a hydrogen atmosphere.
【０００３】しかしながら、上記従来のように、酸化物
化した電子放射物質を含浸する構成では、例えば、炭酸
バリウムが水酸化バリウムに変化するなど、酸化物化し
た電子放射物質が大気中などの水分と反応して水酸化物
に変化しやすく、電子放射物質が水酸化物に変化した含
浸型陰極構体を用いた電子管は、電子放射特性が低下す
る問題を有している。そこで、電子管の電子放射特性を
安定させるためには、作業環境の湿度、時間などが制約
される問題を有している。However, in the structure in which the oxidized electron emitting material is impregnated as in the above-mentioned conventional method, the oxidized electron emitting material reacts with moisture in the atmosphere, for example, when barium carbonate is changed to barium hydroxide. The electron tube using the impregnated cathode structure in which the electron emitting material is changed to hydroxide and the electron emitting substance is changed to hydroxide has a problem that the electron emitting characteristics are deteriorated. Therefore, in order to stabilize the electron emission characteristics of the electron tube, there is a problem that the humidity and time of the working environment are restricted.
【０００４】この点、例えば、特開平２−６６８２９号
公報に記載されているように、電子放射物質と水分との
反応を防止するために、ディスクの表面に、水分を弾く
有機系で耐湿性の被膜を形成する構成が知られている。In this respect, for example, as described in Japanese Patent Application Laid-Open No. 2-66829, in order to prevent the reaction between the electron-emitting substance and water, the surface of the disk is made of an organic material that repels water and has moisture resistance. There is known a structure for forming a coating film.
【０００５】しかしながら、上記従来のように、基体の
表面に有機系で耐湿性の被膜を形成した構成では、被膜
が分解する時に、基体の表面に残渣として炭素が残りや
すく、電子放射特性が低下するなどの問題を有してい
る。However, in the structure in which a moisture-resistant coating of organic type is formed on the surface of the substrate as in the above-mentioned conventional technique, carbon easily remains as a residue on the surface of the substrate when the coating is decomposed, and the electron emission characteristic is deteriorated. There is a problem such as doing.
【０００６】[0006]
【発明が解決しようとする課題】上記のように、酸化物
化した電子放射物質を含浸した含浸型陰極構体では、酸
化物化した電子放射物質が大気中の水分と反応して水酸
化物に変化しやすく、電子放射物質が水酸化物に変化し
た含浸型陰極構体を用いた電子管は、電子放射特性が低
下するため、安定した電子放射特性を得るためには、作
業環境の湿度、時間などが制約される問題を有してい
る。また、基体の表面に、水分を弾く有機系で耐湿性の
被膜を形成した構成では、この被膜が分解する時に、基
体の表面に残渣として炭素が残りやすく、電子放射特性
が低下するなどの問題を有している。As described above, in the impregnated cathode structure impregnated with the oxided electron-emitting substance, the oxided electron-emitting substance reacts with moisture in the atmosphere to change into hydroxide. Since the electron tube using the impregnated cathode structure in which the electron emitting substance is changed to hydroxide is easily deteriorated, the electron emission characteristics are deteriorated.Therefore, in order to obtain stable electron emission characteristics, the humidity and time of the working environment are restricted. Have a problem. In addition, in the structure in which a moisture-resistant organic moisture-resistant coating is formed on the surface of the substrate, when the coating is decomposed, carbon tends to remain on the surface of the substrate as a residue, resulting in deterioration of electron emission characteristics. have.
【０００７】本発明は、このような点に鑑みなされたも
ので、取り扱いが容易で、電子放射特性が良好な含浸型
陰極構体を提供することを目的とする。The present invention has been made in view of the above points, and an object thereof is to provide an impregnated-type cathode assembly which is easy to handle and has good electron emission characteristics.
【０００８】[0008]
【課題を解決するための手段】本発明の含浸型陰極構体
は、多孔質の基体と、この基体に含浸された酸化物を有
する電子放射物質と、この電子放射物質の表面に形成さ
れ前記電子放射物質の他の部分より炭素塩を多く含む被
覆層とを具備したものである。The impregnated-type cathode assembly of the present invention comprises a porous substrate, an electron-emitting substance having an oxide impregnated into the substrate, and the electron formed on the surface of the electron-emitting substance. And a coating layer containing a larger amount of carbon salt than the other part of the radiation material.
【０００９】[0009]
【作用】本発明の含浸型陰極構体では、多孔質の基体に
含浸された酸化物を有する電子放射物質の表面に、この
電子放射物質の他の部分より炭素塩を多く含む被覆層を
形成したので、水分に安定な炭素塩により、電子放射物
質が水分と反応して水酸化物に変化することが抑制さ
れ、電子放射特性の低下が抑制される。炭素塩は、熱分
解すると炭酸ガスとなって排出されるため、分解後の残
渣による電子放射特性の低下が抑制される。In the impregnated-type cathode assembly of the present invention, a coating layer containing a larger amount of carbon salt than the other part of the electron emitting substance is formed on the surface of the electron emitting substance having an oxide impregnated in a porous substrate. Therefore, the water-stable carbon salt suppresses the reaction of the electron-emitting substance with water to change into hydroxide, thereby suppressing the deterioration of the electron emission characteristic. Since carbon salt is discharged as carbon dioxide gas when thermally decomposed, deterioration of electron emission characteristics due to the residue after decomposition is suppressed.
【００１０】[0010]
【実施例】以下、本発明の含浸型陰極構体の一実施例の
構成を図面を参照して説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of one embodiment of the impregnated cathode structure of the present invention will be described below with reference to the drawings.
【００１１】図１において、11は多孔質タングステンか
らなる基体で、この基体11は、多数の空孔部12を有し、
例えば、圧縮成形したタングステン粉末を焼結した後に
薄板のディスク状に切断し、さらに、電子管に取り付け
る所定の形状に切り抜き形成されるようになっている。In FIG. 1, 11 is a base made of porous tungsten, and this base 11 has a large number of pores 12,
For example, after compression-molded tungsten powder is sintered, it is cut into a thin disk shape and further cut out into a predetermined shape to be attached to an electron tube.
【００１２】また、14は電子放射物質で、この電子放射
物質14は、アルミナ（Ａｌ２Ｏ３）、酸化バリウム（Ｂ
ａＯ）、酸化カルシウム（ＣａＯ）など、バリウムを主
成分とする酸化物を含み、基体11の空孔部12などに含浸
されている。Further, 14 is an electron emitting substance, and this electron emitting substance 14 is alumina (Al 2 O 3 ) or barium oxide (B
aO), calcium oxide (CaO), and the like, and oxides containing barium as a main component are included and impregnated into the pores 12 of the substrate 11.
【００１３】さらに、この電子放射物質14の表面部に
は、炭酸塩である炭酸バリウム（ＢａＣＯ３）からな
る、いわゆる炭酸塩リッチな被覆層15が形成され、この
被覆層15により電子放射物質14の表面が覆われて、ディ
スク状の含浸型陰極構体が構成されている。Further, a so-called carbonate rich coating layer 15 made of barium carbonate (BaCO 3 ) which is a carbonate is formed on the surface of the electron emitting material 14, and the electron emitting material 14 is formed by the coating layer 15. The surface is covered to form a disk-shaped impregnated cathode assembly.
【００１４】そして、この被覆層15は、電子放射物質14
を含浸したディスク状の基体11を、露点２０度の湿潤炭
酸ガス雰囲気中で、２００℃で２時間処理を行い、電子
放射物質14の表面部に形成されている。The coating layer 15 is composed of the electron emitting material 14
The disk-shaped substrate 11 impregnated with is subjected to a treatment at 200 ° C. for 2 hours in a wet carbon dioxide gas atmosphere with a dew point of 20 ° C. to form on the surface portion of the electron emitting substance 14.
【００１５】また、この反応は、電子放射物質14の表面
のＸ線回折の結果、電子放射物質14の表面に炭酸バリウ
ムのピークが認められることにより確認され、 ＢａＯ＋Ｈ２Ｏ＋ＣＯ３→ＢａＣＯ３＋Ｈ２Ｏ あるいは、 Ｂａ（ＯＨ）２＋ＣＯ２→ＢａＣＯ３＋Ｈ２Ｏ の反応により、炭酸バリウムが低温処理条件で容易に生
成することが確認される。This reaction was confirmed by the fact that a peak of barium carbonate was observed on the surface of the electron emitting material 14 as a result of X-ray diffraction on the surface of the electron emitting material 14, and BaO + H 2 O + CO 3 → BaCO 3 + H 2 It is confirmed that barium carbonate is easily produced under the low temperature treatment condition by the reaction of O or Ba (OH) 2 + CO 2 → BaCO 3 + H 2 O.
【００１６】そして、この含浸型陰極構体は、所定の形
状に切り抜かれた上で、ブラウン管、撮像管などの電子
管において、高電流密度を必要とする陰極として用いら
れるようになっている。The impregnated cathode structure is cut out into a predetermined shape and then used as a cathode requiring a high current density in electron tubes such as cathode ray tubes and image pickup tubes.
【００１７】そして、この含浸型陰極構体について、所
定の形状に切り抜いた状態で、耐湿試験、電子管エミッ
ション特性を評価したところ、被覆層15を形成していな
い従来の含浸型陰極構体で生ずる水酸化物の形成や、エ
ミッション特性の低下はなく、安定したエミッション特
性を得ることができた。また、気温３０℃、湿度７０
％、期間３か月の条件の環境試験の後にも、エミッショ
ン特性の低下はなく、環境の影響、水分との反応を防止
し得ることが確認できた。With respect to this impregnated-type cathode assembly, a moisture resistance test and electron tube emission characteristics were evaluated in a state of being cut out into a predetermined shape. Stable emission characteristics could be obtained without formation of objects or deterioration of emission characteristics. Also, the temperature is 30 ° C and the humidity is 70.
%, Even after the environmental test under the condition of the period of 3 months, it was confirmed that the emission characteristics were not deteriorated and the influence of the environment and the reaction with water could be prevented.
【００１８】このように、多孔質タングステンの基体11
に含浸された電子放射物質14は水分と反応しやすい酸化
物であるが、本実施例では、特に水分の影響を受けやす
い電子放射物質14の表面部に、炭酸ガスと反応させて炭
酸塩に変化させる炭酸塩化処理により、炭酸バリウムを
多く含む炭酸塩リッチな被覆層15を形成したため、水分
に安定な炭素塩により、電子放射物質14の酸化物が水分
と反応して水酸化物に変化することを最小限度に抑制す
ることができる。そこで、水分による電子放射特性の低
下を抑制でき、大気中など水分のある環境における作業
性を向上できるとともに、長期保管が可能になり、取り
扱いを容易にできるとともに、電子放射特性などエミッ
ション特性の安定性および信頼性を向上することができ
る。Thus, the porous tungsten substrate 11
The electron emissive material 14 impregnated in is an oxide that easily reacts with moisture, but in the present embodiment, the surface of the electron emissive material 14 that is particularly susceptible to moisture is converted into carbonate by reacting with carbon dioxide gas. Since the carbonate-rich coating layer 15 containing a large amount of barium carbonate was formed by the changing carbonation treatment, the water-stable carbon salt causes the oxide of the electron-emitting substance 14 to react with water and change to a hydroxide. This can be suppressed to the minimum. Therefore, deterioration of electron emission characteristics due to moisture can be suppressed, workability in environments with moisture such as the atmosphere can be improved, long-term storage is possible, handling is easy, and emission characteristics such as electron emission characteristics are stable. Reliability and reliability can be improved.
【００１９】また、生成した炭素塩は、電子管製造中の
排気中のライティング処理で容易に熱分解し、この熱分
解により炭酸ガスとなって排出されるとともに、分解生
成した酸化物は電子放射に寄与するため、基体11の表面
を損なうことがない。そこで、電子放射特性の低下を抑
制することができ、信頼性のある陰極を構成することが
できる。Further, the produced carbon salt is easily pyrolyzed by the lighting treatment in the exhaust during the production of the electron tube, and is discharged as carbon dioxide gas by this pyrolysis, and the oxide produced by the decomposition is converted into electron emission. Since it contributes, the surface of the base 11 is not damaged. Therefore, a decrease in electron emission characteristics can be suppressed, and a reliable cathode can be configured.
【００２０】[0020]
【発明の効果】本発明の含浸型陰極構体によれば、多孔
質の基体に含浸された酸化物を有する電子放射物質の表
面に、この電子放射物質の他の部分より炭素塩を多く含
む被覆層を形成したため、水分に安定な炭素塩により、
電子放射物質が水分と反応して水酸化物に変化すること
を抑制できる。そこで、大気中などでの作業および保管
などを容易にでき、取り扱いを容易にできるとともに、
水分による電子放射特性の低下を抑制でき、安定性およ
び信頼性を向上することができる。また、炭素塩は、熱
分解しても炭酸ガスとなって排出されるため、電子放射
特性の低下を抑制することができる。According to the impregnated-type cathode assembly of the present invention, the surface of the electron-emitting substance having an oxide impregnated in the porous substrate is coated with a larger amount of carbon salt than the other parts of the electron-emitting substance. Due to the formation of the layer, the water-stable carbon salt
It can suppress that an electron emitting substance reacts with moisture and changes into a hydroxide. Therefore, work and storage in the atmosphere, etc. can be facilitated and handling is facilitated.
It is possible to suppress deterioration of electron emission characteristics due to moisture and improve stability and reliability. Further, since the carbon salt is discharged as carbon dioxide gas even if it is thermally decomposed, it is possible to suppress deterioration of electron emission characteristics.
【図１】本発明の含浸型陰極構体の一実施例を示す説明
図である。FIG. 1 is an explanatory view showing an example of an impregnated-type cathode assembly of the present invention.
11 基体 14 電子放射物質 15 被覆層 11 Substrate 14 Electron emitting material 15 Coating layer
Claims (1)
他の部分より炭素塩を多く含む被覆層とを具備したこと
を特徴とする含浸型陰極構体。1. A porous substrate, an electron-emitting substance having an oxide impregnated in the substrate, and a coating formed on the surface of the electron-emitting substance and containing a larger amount of carbon salt than other portions of the electron-emitting substance. An impregnated-type cathode assembly comprising a layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10425695A JPH08298076A (en) | 1995-04-27 | 1995-04-27 | Impregnation type cathode body structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10425695A JPH08298076A (en) | 1995-04-27 | 1995-04-27 | Impregnation type cathode body structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08298076A true JPH08298076A (en) | 1996-11-12 |
Family
ID=14375857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10425695A Pending JPH08298076A (en) | 1995-04-27 | 1995-04-27 | Impregnation type cathode body structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08298076A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003016921A (en) * | 2000-09-20 | 2003-01-17 | Canon Inc | Structure, electron emission element, image forming device, and manufacturing method thereof |
| DE10226123A1 (en) * | 2002-06-12 | 2004-01-08 | Mtu Cfc Solutions Gmbh | Production of a sealing material for a fuel cell involves impregnating a porous base material with a concentrated solution of metal ions, and subjecting to an atmosphere containing carbon dioxide |
-
1995
- 1995-04-27 JP JP10425695A patent/JPH08298076A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003016921A (en) * | 2000-09-20 | 2003-01-17 | Canon Inc | Structure, electron emission element, image forming device, and manufacturing method thereof |
| DE10226123A1 (en) * | 2002-06-12 | 2004-01-08 | Mtu Cfc Solutions Gmbh | Production of a sealing material for a fuel cell involves impregnating a porous base material with a concentrated solution of metal ions, and subjecting to an atmosphere containing carbon dioxide |
| DE10226123B4 (en) * | 2002-06-12 | 2006-04-06 | Mtu Cfc Solutions Gmbh | Method for producing a sealing material for a fuel cell assembly, in particular for a molten carbonate fuel cell assembly, and sealing material produced thereby |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Mueller et al. | A synchrotron radiation study of BaO films on W (001) and their interaction with H2O, CO2, and O2 | |
| JP2746186B2 (en) | Phosphor | |
| RU2005129088A (en) | COMPOSITION AND DEVICE FOR GAS SORPTION AND METHOD FOR PRODUCING COMPOSITION | |
| US2806970A (en) | Electron emission coatings and method of preparing air stabilized barium oxide | |
| JPH01197934A (en) | Cathode for electron tube | |
| JPH08298076A (en) | Impregnation type cathode body structure | |
| KR100294485B1 (en) | Oxide cathode | |
| EP0741403B1 (en) | Method of depositing a material on an electrode for an arc tube | |
| US2175696A (en) | Electron emitter | |
| CN1042871C (en) | Oxide cathode | |
| KR100244175B1 (en) | Cathode for cathode ray tube | |
| JPH073434A (en) | Oxide cathode and its preparation | |
| JPH07122177A (en) | Oxide cathode | |
| EP0720196B1 (en) | Thermion emitting oxide cathode and method for making the same | |
| US20030164668A1 (en) | Cathode-ray tube cathode and alloy therefor | |
| KR100346369B1 (en) | Oxide-coated cathode | |
| JPS6290819A (en) | Cathode for electron tube | |
| RU2010374C1 (en) | Suspension for manufacture of gas absorber | |
| CN117747381A (en) | Low-evaporation coated diffusion cathode, preparation and application | |
| KR19990053587A (en) | Cathode Structure for Cathode Ray Tube | |
| KR19990050870A (en) | Cathode Structure for Cathode Ray Tube | |
| JP2001214160A (en) | Fluorescent substance and fluorescent display tube | |
| JPH01143116A (en) | Electronic tube cathode | |
| JPH03295129A (en) | Cathode for electronic tube | |
| KR20020051704A (en) | cathod of color cathode ray tube |