JPH0782809B2 - Impregnated cathode assembly - Google Patents
Impregnated cathode assemblyInfo
- Publication number
- JPH0782809B2 JPH0782809B2 JP5482786A JP5482786A JPH0782809B2 JP H0782809 B2 JPH0782809 B2 JP H0782809B2 JP 5482786 A JP5482786 A JP 5482786A JP 5482786 A JP5482786 A JP 5482786A JP H0782809 B2 JPH0782809 B2 JP H0782809B2
- Authority
- JP
- Japan
- Prior art keywords
- metal
- cup
- metal sleeve
- sleeve
- metal cup
- 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.)
- Expired - Fee Related
Links
Landscapes
- Solid Thermionic Cathode (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は含浸形陰極構体に係わり、特に、電子放射物質
を含浸したカソード基体を収納する金属カップと、この
金属カップを支持しかつヒーターを内包する金属スリー
ブとをろう付けし、それらの固着を強固にした信頼性の
高い含浸形陰極構体に関する。Description: TECHNICAL FIELD The present invention relates to an impregnated cathode assembly, and more particularly to a metal cup for housing a cathode substrate impregnated with an electron emitting substance, and a metal cup supporting the metal cup and a heater. The present invention relates to a highly reliable impregnated cathode assembly in which a metal sleeve to be encapsulated is brazed to firmly fix them.
従来の含浸形陰極構体としては、特開昭59−108233号公
報で提案されているように、電子放射物質を含浸したカ
ソード基体を収納する金属カップと、この金属カップを
支持しかつヒーターを内包する金属スリーブとをレーザ
ー溶接によって固着する方法が知られている。また、同
じ含浸形陰極構体として、特開昭54−67757号公報で提
案されているように、有底金属スリーブの底面外側にカ
ソード基体を溶接する際に、予め、金属スリーブの底面
外側にエンボス加工を施し、このエンボス内にろう材を
充填させた状態にして底面外側にカソード基体を載置
し、次に、金属スリーブの底面内側からエンボスにレー
ザー照射し、金属スリーブの底面外側にカソード基体を
レーザー溶接させる方法も知られている。As a conventional impregnated cathode assembly, as proposed in JP-A-59-108233, a metal cup housing a cathode substrate impregnated with an electron emitting material, and a metal cup supporting the metal cup and enclosing a heater are included. There is known a method of fixing a metal sleeve to be welded by laser welding. Further, as the same impregnated cathode structure, as proposed in JP-A-54-67757, when the cathode substrate is welded to the outer surface of the bottom surface of the bottomed metal sleeve, it is previously embossed on the outer surface of the bottom surface of the metal sleeve. After processing, the embossing is filled with the brazing filler metal, and the cathode base is placed on the outside of the bottom surface.Next, the embossing is irradiated with laser from the inside of the bottom surface of the metal sleeve, and the cathode base is placed on the outside of the bottom surface of the metal sleeve. There is also known a method of laser welding.
上記特開昭59−108233号公報の提案による方法は、レー
ザービームを用いたレーザー溶接時に、高融点金属から
なる金属カップや金属スリーブを急熱または急冷する
と、微小なクラックを生じることがあり、固着溶接の信
頼性を損ねるとともに、カソード基体に含浸された電子
放射物質がヒーター側に洩れ出すという問題がある。ま
た、特開昭54−67757号公報の提案による方法は、レー
ザービームによるレーザーを用いているために、上記問
題が必ずしも全面解決されておらず、しかも、カソード
基体と金属スリーブの底面外側とはエンボス部分のみろ
う材が介在しているに過ぎないので、カソード基体と金
属スリーブの底面外側との固着は必ずしも強固でなく、
信頼性も充分でないという問題がある。The method proposed by the above-mentioned JP-A-59-108233, when laser welding using a laser beam, when a metal cup or a metal sleeve made of a refractory metal is rapidly heated or rapidly cooled, minute cracks may occur, There is a problem that the reliability of the fixed welding is impaired and the electron emitting material impregnated in the cathode substrate leaks to the heater side. Further, the method proposed by Japanese Patent Laid-Open No. 54-67757 does not always solve the above problems because a laser beam is used, and moreover, the cathode substrate and the outside of the bottom surface of the metal sleeve are different from each other. Since the brazing filler metal is only interposed in the embossed portion, the adhesion between the cathode base and the outside of the bottom surface of the metal sleeve is not always strong,
There is a problem that reliability is not sufficient.
本発明は、これらの問題点を除くもので、この目的は、
溶接時に金属カップや金属スリーブにクラックを生じる
ことなく、金属カップの側面と金属スリーブの内面間を
十分な量のろう材を用いてろう付け固着した含浸形陰極
構体を提供することにある。The present invention eliminates these problems.
An object of the present invention is to provide an impregnated cathode assembly in which the side surface of the metal cup and the inner surface of the metal sleeve are brazed and fixed with a sufficient amount of brazing material without causing cracks in the metal cup or the metal sleeve during welding.
上記目的の達成のために、本発明は、電子放射物質をが
含浸する高融点金属の多孔質焼結体からなる陰極基体
と、前記陰極基体を収納する金属カップと、内面に前記
金属カップの側面が固着され、かつ、ヒーターを内包す
る金属スリーブとによって構成される含浸形陰極構体に
おいて、前記金属カップの側面が固着される前記金属ス
リーブ内面の一部に、前記金属スリーブの外面方向に突
出した凹状部を設け、前記金属スリーブと前記金属カッ
プとを固着する際に、前記凹状部内にろう材を充填さ
せ、このろう材を加熱することにより、前記金属カップ
の全側面と、この側面に相対する前記金属スリーブの内
面との間にろう材を介在させ、前記金属スリーブと前記
金属カップとを固着させる手段を備える。In order to achieve the above object, the present invention provides a cathode base made of a porous sintered body of a refractory metal impregnated with an electron emitting material, a metal cup housing the cathode base, and an inner surface of the metal cup. In an impregnated-type cathode assembly having a side surface fixed and a metal sleeve enclosing a heater, a part of the inner surface of the metal sleeve to which the side surface of the metal cup is fixed protrudes toward the outer surface of the metal sleeve. When the metal sleeve and the metal cup are fixed to each other, a brazing material is filled in the concave portion, and the brazing material is heated so that the entire side surface of the metal cup and this side surface are provided. A brazing material is interposed between the metal sleeve and the inner surface of the metal sleeve which face each other, and means for fixing the metal sleeve and the metal cup to each other is provided.
ろう材に一般的な粉末形状のものを用いると、溶解、凝
固時にろう材の見かけ上の体積が大きく減少する。そこ
で、溶解前においてろう材の貯蔵部となる凹状部を、金
属カップが固着溶接される金属スリーブの内面に設け、
この凹状部にろう材を供給することによって、金属カッ
プの全側面とそれに相対する金属スリーブの内面との間
に十分なろう材を介在させ、金属カップと金属スリーブ
とが強固にろう付け固着させるものである。When a general brazing powder is used, the apparent volume of the brazing material is greatly reduced during melting and solidification. Therefore, a concave portion that serves as a storage portion for the brazing material before melting is provided on the inner surface of the metal sleeve to which the metal cup is fixedly welded,
By supplying the brazing material to the concave portion, a sufficient brazing material is interposed between the entire side surface of the metal cup and the inner surface of the metal sleeve opposed thereto, and the metal cup and the metal sleeve are firmly brazed and fixed. It is a thing.
以下、本発明の一実施例を第１図により説明する。カソ
ード基体１は、空孔率20〜25％のタングステンの多孔質
基体２の空孔にバリウム・カルシウム・アルミネート等
の電子放射物質３を含浸した構成より成る。４は金属カ
ップ、５は金属スリーブ、6,7はろう材、８は凹状部で
ある。An embodiment of the present invention will be described below with reference to FIG. The cathode substrate 1 is composed of a porous substrate 2 made of tungsten having a porosity of 20 to 25% and the pores of the porous substrate 2 impregnated with an electron emissive material 3 such as barium calcium aluminate. 4 is a metal cup, 5 is a metal sleeve, 6 and 7 are brazing filler metals, and 8 is a concave portion.
本実施例の含浸形陰極構体を製造するには、始めに、多
孔質基体２と、多孔質基体２を収納するモリブテン（M
o）製の金属カップ４と、金属カップ４が固着される内
面に、第１図に示すように、外面側に突出した凹状部８
を設けたモリブテン（Mo）製の金属スリーブ５とを準備
する。次に、金属カップ４の底面部に十分な量のろう材
を設けるとともに、金属スリーブ５の凹状部８内にそれ
ぞれ十分な量のろう材を充填させる。続いて、ろう材を
設けた金属カップ４内に多孔質基体２を収納させ、多孔
質基体２を収納した金属カップ４を金属スリーブ５の固
着部に嵌め込む。次いで、金属カップ４の底面部及び金
属カップ４が固着される金属スリーブ５の外周部分を既
知の加熱手段によって加熱し、この加熱により、金属ス
リーブ５の凹状部８内に充填されているろう材が解け出
し、互いに接している金属カップ４の側面と金属スリー
ブ５の内面間にろう材が一様に行き渡った状態でろう付
けが行われ、同時に、金属カップ４の底面部にあるろう
材も解け、金属カップ４の底面部とそれに接している多
孔質基体２の底面間にろう材が一様に行き渡った状態で
ろう付けが行われる。In order to manufacture the impregnated cathode assembly of this embodiment, first, the porous substrate 2 and molybdenum (M
As shown in FIG. 1, the metal cup 4 made of o) and the concave portion 8 protruding to the outer surface side are fixed to the inner surface to which the metal cup 4 is fixed.
And a metal sleeve 5 made of molybden (Mo) provided with. Next, a sufficient amount of brazing material is provided on the bottom surface of the metal cup 4, and the concave portions 8 of the metal sleeve 5 are filled with a sufficient amount of brazing material. Then, the porous substrate 2 is housed in the metal cup 4 provided with the brazing material, and the metal cup 4 housing the porous substrate 2 is fitted into the fixing portion of the metal sleeve 5. Next, the bottom surface portion of the metal cup 4 and the outer peripheral portion of the metal sleeve 5 to which the metal cup 4 is fixed are heated by a known heating means, and by this heating, the brazing material filled in the concave portion 8 of the metal sleeve 5 is heated. Is melted, and brazing is performed with the brazing filler metal evenly distributed between the side surfaces of the metal cup 4 and the inner surface of the metal sleeve 5 which are in contact with each other, and at the same time, the brazing filler metal on the bottom surface of the metal cup 4 is also removed. After the melting, the brazing is performed with the brazing filler metal evenly distributed between the bottom surface of the metal cup 4 and the bottom surface of the porous substrate 2 in contact with it.
しかる後に、多孔質基体２の空孔に、バリウム・カルシ
ウム・アルミネートよりなる電子放射物質３を含浸させ
る。After that, the pores of the porous substrate 2 are impregnated with the electron emitting substance 3 made of barium-calcium-aluminate.
なお本実施例では、多孔質基体２とカップ４及びカップ
４とスリーブ５の固着を同時にろう付けにより行った
が、別々に行っても良い。In this embodiment, the porous substrate 2 and the cup 4 and the cup 4 and the sleeve 5 are simultaneously fixed by brazing, but they may be fixed separately.
本発明によれば、カップ４とスリーブ５の固着におい
て、スリーブの一部に凹状部を設けることにより、十分
なろう材が供給され、信頼性の高い固着が可能となり、
また、金属スリーブ５や金属カップ４にクラックが発生
することはないので、電子放射物質がヒーター側に洩れ
出すこともない。According to the present invention, when the cup 4 and the sleeve 5 are fixed to each other, by providing a concave portion in a part of the sleeve, a sufficient brazing material is supplied, and the fixing can be performed with high reliability.
Further, since the metal sleeve 5 and the metal cup 4 are not cracked, the electron emitting material does not leak to the heater side.
本発明によれば、金属カップ４の側面を金属スリーブ５
の内面に固着する際に、レーザー溶接を採用していない
ので、金属カップ４や金属スリーブ５にクラックが生じ
ることはなく、また、金属カップ４の側面と金属スリー
ブ５の内面のほぼ全域に十分な量のろう材を供給したろ
う付け固着を行っているので、固着面が極めて強固にな
り、高い信頼性を有する含浸形陰極構体が得られるとい
う効果がある。According to the present invention, the side surface of the metal cup 4 is attached to the metal sleeve 5.
Since it does not employ laser welding when it is fixed to the inner surface of the, the metal cup 4 and the metal sleeve 5 are not cracked, and the side surface of the metal cup 4 and the inner surface of the metal sleeve 5 are almost entirely covered. Since brazing and fixing are performed by supplying a large amount of brazing material, the fixing surface becomes extremely strong, and there is an effect that an impregnated cathode assembly having high reliability can be obtained.
第１図は本発明の一実施例の縦断面図である。 １……カソード基体、２……多孔質基体、３……電子放
射物質、４……カップ、５……スリーブ、６……ろう
材、７……ろう材、８……凹状部。FIG. 1 is a vertical sectional view of an embodiment of the present invention. 1 ... Cathode substrate, 2 ... Porous substrate, 3 ... Electron emitting material, 4 ... Cup, 5 ... Sleeve, 6 ... Brazing material, 7 ... Brazing material, 8 ... Recessed portion.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 鈴木 行男 千葉県茂原市早野3300番地 株式会社日立 製作所茂原工場内 (72)発明者 川崎 浩 千葉県茂原市早野3681番地 日立デバイス エンジニアリング株式会社内 (56)参考文献 特開 昭58−218267（ＪＰ，Ａ) 特開 昭54−67757（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yukio Suzuki 3300 Hayano, Mobara-shi, Chiba Hitachi Mobara factory (72) Inventor Hiroshi Kawasaki 3681 Hayano, Mobara-shi, Chiba Hitachi Device Engineering Co., Ltd. ( 56) References JP-A-58-218267 (JP, A) JP-A-54-67757 (JP, A)
Claims (1)
質焼結体からなる陰極基体と、前記陰極基体を収納する
金属カップと、内面に前記金属カップの側面が固着さ
れ、かつ、ヒーターを内包する金属スリーブとによって
構成される含浸形陰極構体において、前記金属カップの
側面が固着される前記金属スリーブの内面の一部に、前
記金属スリーブの外面方向に突出した凹状部を設け、前
記金属スリーブと前記金属カップとを固着する際に、前
記凹状部内にろう材を充填させ、このろう材を加熱する
ことにより、前記金属カップの全側面と、この側面に相
対する前記金属スリーブの内面との間にろう材を介在さ
せ、前記金属スリーブと前記金属カップとを固着させる
ようにしたことを特徴とする含浸形陰極構体。1. A cathode base made of a porous sintered body of a refractory metal impregnated with an electron emitting material, a metal cup housing the cathode base, a side surface of the metal cup fixed to an inner surface, and a heater. In an impregnated cathode structure constituted by a metal sleeve enclosing, a part of the inner surface of the metal sleeve to which the side surface of the metal cup is fixed is provided with a concave portion protruding in the outer surface direction of the metal sleeve, When fixing the metal sleeve and the metal cup, the concave portion is filled with a brazing material, and by heating the brazing material, the entire side surface of the metal cup and the inner surface of the metal sleeve facing the side surface. An impregnated-type cathode assembly characterized in that a brazing material is interposed between the metal sleeve and the metal cup to fix the metal sleeve and the metal cup together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5482786A JPH0782809B2 (en) | 1986-03-14 | 1986-03-14 | Impregnated cathode assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5482786A JPH0782809B2 (en) | 1986-03-14 | 1986-03-14 | Impregnated cathode assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62213032A JPS62213032A (en) | 1987-09-18 |
| JPH0782809B2 true JPH0782809B2 (en) | 1995-09-06 |
Family
ID=12981501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5482786A Expired - Fee Related JPH0782809B2 (en) | 1986-03-14 | 1986-03-14 | Impregnated cathode assembly |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0782809B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6054737B2 (en) * | 1977-11-09 | 1985-12-02 | 株式会社東芝 | Manufacturing method of impregnated cathode |
| JPS58218267A (en) * | 1982-06-11 | 1983-12-19 | Hitachi Ltd | Support structure for impregnated cathode |
-
1986
- 1986-03-14 JP JP5482786A patent/JPH0782809B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62213032A (en) | 1987-09-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |