JPH0439646Y2 - - Google Patents

Info

Publication number
JPH0439646Y2
JPH0439646Y2 JP3828485U JP3828485U JPH0439646Y2 JP H0439646 Y2 JPH0439646 Y2 JP H0439646Y2 JP 3828485 U JP3828485 U JP 3828485U JP 3828485 U JP3828485 U JP 3828485U JP H0439646 Y2 JPH0439646 Y2 JP H0439646Y2
Authority
JP
Japan
Prior art keywords
heater
cathode
impregnated
cylindrical body
embedding agent
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
Application number
JP3828485U
Other languages
Japanese (ja)
Other versions
JPS61156149U (en
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP3828485U priority Critical patent/JPH0439646Y2/ja
Publication of JPS61156149U publication Critical patent/JPS61156149U/ja
Application granted granted Critical
Publication of JPH0439646Y2 publication Critical patent/JPH0439646Y2/ja
Expired legal-status Critical Current

Links

Description

【考案の詳細な説明】 〔考案の技術分野〕 この考案は、特に高信頼性が要求される進行波
管やクライストロンなどの電子管に好適な含浸型
陰極構体に関する。
[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an impregnated cathode structure suitable for electron tubes such as traveling wave tubes and klystrons that particularly require high reliability.

〔考案の技術的背景とその問題点〕[Technical background of the invention and its problems]

人工衛星などに搭載される高出力進行波管など
には高電流密度が要求され、それに適する陰極と
して含浸型陰極構体がある。特にこの陰極に要求
される特性は、長寿命であること、また衛星に搭
載される場合には太陽電池が電源となるので、低
消費電力型であることが必要である。さらに高信
頼性であることが要求され、打上げ時の衝撃に対
して変形しないこと、ヒータの埋込剤が脱落する
と、陰極基体への熱伝達が低下して陰極の温度が
下がり、特性劣化をおこし、また脱落物が管内異
物となつて、電子管の動作を妨げたり、管内放電
を発生したりするので、衝撃に対して十分な強度
をもつことなどが必要である。
High current density is required for high-power traveling wave tubes mounted on artificial satellites, etc., and an impregnated cathode structure is suitable for this purpose. In particular, the characteristics required of this cathode are that it has a long lifespan, and that it has low power consumption since solar cells will be the power source when it is mounted on a satellite. Furthermore, high reliability is required, and it must not be deformed by impact during launch.If the heater embedding agent falls off, heat transfer to the cathode substrate will decrease, causing the cathode temperature to drop and causing property deterioration. It is necessary to have sufficient strength to withstand shocks, as the falling objects may become foreign objects in the tube, which may interfere with the operation of the electron tube or cause discharge within the tube.

ところで、従来の含浸型陰極構体は、第4図に
示すように、タングステン粉末を焼結して得られ
た多孔質の金属基体の空孔部に、BaO,CaO,
Al2O3などからなる電子放射物質を含浸させ、凹
球面状に形成された一端面を電子放射面1とする
陰極基体2の他端面側にヒータ部3が取り付けら
れた構造になつており、ヒータ部3は、モリブデ
ン・ルテニウム合金からなるろう材4により、上
記陰極基体2の他端面側に接合されたモリブデン
などの高融点金属からなる筒状のヒータ容器5
と、このヒータ容器5内に挿入されたヒータ6
と、アルミナ粉末を有機バインダで泥状化し、こ
れを上記ヒータ容器5内に充填したのち、水素あ
るいは真空中で高温加熱して焼結させたヒータ埋
込剤7とからなる。
By the way, in the conventional impregnated cathode structure, as shown in FIG. 4, BaO, CaO,
It has a structure in which a cathode substrate 2 is impregnated with an electron emitting substance such as Al 2 O 3 and formed into a concave spherical shape, with one end surface serving as an electron emitting surface 1 and a heater section 3 attached to the other end surface side. The heater section 3 includes a cylindrical heater container 5 made of a high-melting point metal such as molybdenum, which is bonded to the other end surface of the cathode substrate 2 by a brazing filler metal 4 made of a molybdenum-ruthenium alloy.
and a heater 6 inserted into this heater container 5.
and a heater embedding agent 7, which is made by turning alumina powder into a slurry with an organic binder, filling it into the heater container 5, and then sintering it by heating it at high temperature in hydrogen or vacuum.

このようにヒータ6を埋込むと、陰極基体2を
通常の酸化物陰極より高い980〜1050℃に加熱す
るヒータ6の温度を下げることができ、ヒータ6
の断線を防止することができる。
By embedding the heater 6 in this way, the temperature of the heater 6 that heats the cathode substrate 2 to 980 to 1050°C, which is higher than that of a normal oxide cathode, can be lowered.
It is possible to prevent wire breakage.

しかしながら上記のようなアルミナ粉末を有機
バインダで泥状化してヒータ容器5に充填する
と、埋込剤7は、バインダが乾燥するときに収縮
して、ヒータ容器5の開口縁からの深さが一定し
ない。そのためバインダ乾燥後、上記開口から先
のとがつた金属棒やガラス棒などで余剰の埋込剤
を除去するが、直径3〜5mm程度であつて、かつ
ヒータ6の脚部が露出しているヒータ容器5内か
ら余剰の埋込剤を除去することはきわめて困難で
ある。またその表面を平坦化することも困難であ
る。またバインダが乾燥して収縮するとき、表面
容器5の内面にアルミナ微粒子が大量のバインダ
により結着されるが、このアルミナ微粒子はほと
んど除去することができず、そのまま焼結され
る。そのためこれが打上げ時の衝撃で脱落しやす
く、管内異物となつて電子管動作に悪影響を与え
る。さらにまた、埋込剤の余剰部分の除去が正確
におこなわれないと、熱伝達にばらつきを生じ、
ヒータ6オン後陰極基体2が所定の動作温度にな
るまでの時間が異なるようになり、電子管の動作
開始時間が変化する。また充填量の不均一により
ヒータの消費電力が変化するなどの問題点があ
る。
However, when the above alumina powder is made into a slurry with an organic binder and filled into the heater container 5, the embedding agent 7 contracts when the binder dries, and the depth from the opening edge of the heater container 5 remains constant. do not. Therefore, after the binder dries, excess embedding material is removed from the opening using a pointed metal rod or glass rod, but the diameter is approximately 3 to 5 mm, and the legs of the heater 6 are exposed. It is extremely difficult to remove excess embedding material from inside the heater container 5. It is also difficult to flatten the surface. Further, when the binder dries and shrinks, a large amount of alumina particles are bound to the inner surface of the surface container 5 by the binder, but these alumina particles can hardly be removed and are sintered as they are. Therefore, this material tends to fall off due to impact during launch, becoming a foreign object inside the tube and adversely affecting the operation of the electron tube. Furthermore, if excess mounting material is not removed accurately, heat transfer may vary.
The time it takes for the cathode substrate 2 to reach a predetermined operating temperature after the heater 6 is turned on becomes different, and the operation start time of the electron tube changes. Further, there are problems such as variations in power consumption of the heater due to non-uniform filling amount.

〔考案の目的〕[Purpose of invention]

この考案は、ヒータ埋込剤の量を一定にするこ
とができ、しかも脱落を生ぜず、高信頼性かつ高
品位にして製作容易な含浸型陰極構体を構成する
ことにある。
The purpose of this invention is to construct an impregnated cathode structure that can keep the amount of heater embedding agent constant, does not fall off, is highly reliable, has high quality, and is easy to manufacture.

〔考案の概要〕[Summary of the idea]

高融点多孔質金属基体の空孔部に電子放射物質
が含浸され、一端面を電子放射面とする陰極基体
の他端側面に、ヒータ容器内に耐熱絶縁性の埋込
剤によりヒータが埋込まれたヒータ部が取り付け
られた含浸型陰極構体において、上記ヒータ容器
を同軸に接合される一対の筒体で構成し、かつ上
記陰極基体側に位置する第1筒体に上記埋込剤を
ほぼ完全に充填し、上記陰極基体から離れて位置
する第2筒体に埋込剤が存在しないように構成す
ることにより、ヒータ容器に埋込剤を一定量かつ
脱落を生じないように充填できるようにした。
The pores of the high melting point porous metal substrate are impregnated with an electron emitting substance, and one end surface is the electron emitting surface, and the other end surface of the cathode substrate is embedded with a heater in a heater container using a heat-resistant insulating embedding material. In the impregnated cathode assembly to which the heater section is attached, the heater container is composed of a pair of cylinders coaxially joined, and the embedding agent is substantially filled in the first cylinder located on the cathode base side. By completely filling the heater container and configuring the second cylindrical body located away from the cathode substrate so that no embedding agent is present, the heater container can be filled with a constant amount of embedding agent without falling out. I made it.

〔考案の実施例〕[Example of idea]

以下、図面を参照してこの考案を実施例に基づ
いて説明する。
Hereinafter, this invention will be explained based on examples with reference to the drawings.

第1図にこの考案の一実施例である含浸型陰極
構体を示す。この陰極構体は、一端面を電子放射
面1とする陰極基体2と、この陰極基体2の他端
面側に取り付けられたヒータ部10とを有する。
FIG. 1 shows an impregnated cathode structure which is an embodiment of this invention. This cathode assembly includes a cathode base 2 having one end surface as an electron emitting surface 1, and a heater section 10 attached to the other end surface of the cathode base 2.

上記陰極基体2は、タングステンからなる高融
点多孔質金属基体の空孔部に、BaO,CaO,Al2
O3からなる電子放射物質を含浸させたものであ
つて、電子放射面1は、その一端面に凹球面状に
形成され、また他端面側には、ヒータ部10が取
り付けられる径小部が形成されている。
The cathode substrate 2 has BaO, CaO, Al 2 in the pores of a high melting point porous metal substrate made of tungsten.
The electron emitting surface 1 is impregnated with an electron emitting material made of O 3 , and the electron emitting surface 1 has a concave spherical shape on one end surface, and a small diameter portion on the other end surface to which the heater section 10 is attached. It is formed.

ヒータ部10は、上記陰極基体2の径小部に嵌
合するモリブデンからなる筒状のヒータ容器11
と、このヒータ容器11内に挿入されたヒータ6
と、このヒータ6を埋込む如く上記ヒータ容器1
1に充填されたアルミナ粉末からなる耐熱絶縁性
の埋込剤12とからなる。上記ヒータ容器11
は、上記陰極基体2の径小部に嵌合し、陰極基体
2の他端面を被覆するモリブデン・ルテニウム合
金からなる高融点ろう材4により陰極基体2に同
軸に接合され、内側に埋込剤12がその開口端ま
でほぼ完全に充填された第1筒体14と、この第
1筒体14の開口端側に形成された径小部の外側
に嵌合されて、たとえばレーザ溶接により第1筒
体14と同軸一体に取り付けられ、内側に埋込剤
12が存在しない第2筒体15とから構成されて
いる。
The heater section 10 includes a cylindrical heater container 11 made of molybdenum that fits into the small diameter portion of the cathode substrate 2.
and the heater 6 inserted into this heater container 11
Then, the heater container 1 is inserted so as to embed the heater 6 therein.
1 and a heat-resistant insulating embedding agent 12 made of alumina powder. The heater container 11
is coaxially joined to the cathode substrate 2 by a high melting point brazing material 4 made of a molybdenum-ruthenium alloy that fits into the small diameter portion of the cathode substrate 2 and covers the other end surface of the cathode substrate 2, and has an embedding agent inside. 12 is almost completely filled up to its open end, and the first cylinder 12 is fitted onto the outside of a small-diameter portion formed on the open end side of the first cylinder body 14, and the first The second cylinder 15 is attached coaxially with the cylinder 14 and has no implant 12 inside.

なお、第1図において、17は支持体、18は
支持筒である。
In addition, in FIG. 1, 17 is a support body, and 18 is a support cylinder.

この含浸型陰極構体はつぎにように製作され
る。
This impregnated cathode structure is manufactured as follows.

まず所定粒径のタングステン粉末を棒状に圧縮
成形し、これを還元性雰囲気中で焼結する。そし
てこの焼結により得られた多孔質焼結体の空孔部
に銅を含浸し、これ銅含浸焼結体を切削加工によ
り所定形状に加工する。しかるのち含浸した銅を
硝酸および水素炉などによる高温加熱で除去し、
あらたにその空孔部にBaO,CaO,Al2O3などか
らなる電子放射物質を高温の還元性雰囲気中で溶
融含浸させて陰極基体2を製作する。
First, tungsten powder with a predetermined particle size is compression-molded into a rod shape, and this is sintered in a reducing atmosphere. Then, the pores of the porous sintered body obtained by this sintering are impregnated with copper, and the copper-impregnated sintered body is processed into a predetermined shape by cutting. The impregnated copper is then removed by high-temperature heating using nitric acid and a hydrogen furnace.
The cathode substrate 2 is then fabricated by melting and impregnating the hole with an electron-emitting substance made of BaO, CaO, Al 2 O 3 or the like in a high-temperature reducing atmosphere.

つぎにこの陰極基体2の径小部側の端面にモリ
ブデン・ルテニウム合金からなるろう材を塗布し
たのち、あらかじめ切削などの機械加工により形
成したモリブデンからなる第1筒体14を上記径
小部に嵌合し、これらを水素雰囲気中で加熱して
上記ろう材を溶融する。溶融したろう材4は、上
記陰極基体2の径小部側の端面を被覆するととも
に、陰極基体2と第1筒体14との嵌合部に浸入
してこれらをろう接する。
Next, after applying a brazing material made of a molybdenum-ruthenium alloy to the end face of the small diameter portion of the cathode substrate 2, a first cylindrical body 14 made of molybdenum, which has been previously formed by machining such as cutting, is attached to the small diameter portion. They are fitted together and heated in a hydrogen atmosphere to melt the brazing material. The molten brazing filler metal 4 covers the end face of the cathode base 2 on the small-diameter side, and also enters the fitting portion between the cathode base 2 and the first cylindrical body 14 to braze them together.

つぎに、この陰極基体2に一体に接合された第
1筒体14内にヒータ6を挿入し、さらに平均粒
径が10μmと30μmのアルミナ粉末を3:7の割合
で混合し、これにニトロセルローズをバインダと
して有機溶剤を加えて混練したものを、第1筒体
14の開口面上に盛り上がるように充填して乾燥
する。しかるのちこの埋込剤12を金属板または
ガラス板などからなる工具を用いて、第1筒体1
4の開口端縁と同一平面になるように余剰の埋込
剤を削り取る。その後真空中で加熱して、この第
1筒体14内の埋込剤12を焼結する。
Next, a heater 6 is inserted into the first cylindrical body 14 that is integrally joined to the cathode base 2, and alumina powders having an average particle size of 10 μm and 30 μm are mixed in a ratio of 3:7, and nitro A mixture of cellulose as a binder and an organic solvent is added and kneaded, and then filled so as to bulge on the opening surface of the first cylindrical body 14 and dried. Thereafter, this embedding agent 12 is inserted into the first cylindrical body 1 using a tool made of a metal plate, a glass plate, or the like.
Scrape off the excess embedding material so that it is flush with the opening edge of step 4. Thereafter, it is heated in a vacuum to sinter the embedding agent 12 within this first cylindrical body 14.

しかるのちこの第1筒体14の開口部に形成さ
れている径小部に、あらかじめ切削などの機械加
工により形成された第2筒体15を嵌合し、レー
ザ溶接によりこの第2筒体15を第1筒体14に
接合する。
Thereafter, a second cylinder 15 previously formed by machining such as cutting is fitted into the small diameter portion formed in the opening of the first cylinder 14, and the second cylinder 15 is assembled by laser welding. is joined to the first cylindrical body 14.

上記のように含浸型陰極構体を構成すると、第
2筒体15を接合する前に、第1筒体14の開口
端縁を基準にして余剰の埋込剤を除去できるの
で、埋込剤12の充填量を一定にすることができ
る。したがつてヒータ部10の熱容量が一定とな
り、ヒータ6オン後陰極基体2が動作温度に到達
するまでの時間のばらつきを少くすることがで
き、またヒータの消費電力を一定にすることがで
きる。また第1筒体14に埋込剤12を充填した
のちに第2筒体15を接合することができ、この
第2筒体15には全然充填剤12が付着しないの
で、従来の含浸型陰極構体と異なり、衝撃が加わ
つてもアルミナが脱落することがない。また第2
筒体15にアルミナが全然付着していないので、
支持筒17を容易に溶接することができる。また
第1筒体14に充填された埋込剤12をその開口
端縁を基準にして、第2筒体15を接合する前に
削り取ることができるので、その作業を容易にお
こなうことができ、かつその面をアルミナの脱落
のない平坦面に仕上げることができる。
When the impregnated cathode structure is configured as described above, excess embedding agent can be removed with reference to the opening edge of the first cylindrical body 14 before joining the second cylindrical body 15. The filling amount can be kept constant. Therefore, the heat capacity of the heater section 10 becomes constant, and variations in the time it takes for the cathode substrate 2 to reach the operating temperature after the heater 6 is turned on can be reduced, and the power consumption of the heater can be made constant. Furthermore, the second cylinder 15 can be joined after filling the first cylinder 14 with the embedding agent 12, and since the filler 12 does not adhere to the second cylinder 15 at all, the conventional impregnated cathode Unlike the structure, the alumina does not fall off even if an impact is applied. Also the second
Since there is no alumina attached to the cylinder 15,
The support tube 17 can be easily welded. Furthermore, since the embedding agent 12 filled in the first cylindrical body 14 can be scraped off before joining the second cylindrical body 15 based on the opening edge of the first cylindrical body 14, this work can be easily performed. Moreover, the surface can be finished as a flat surface without any alumina falling off.

つぎに他の実施例について述べる。 Next, other embodiments will be described.

上記実施例では、第1筒体と第2筒体とを嵌合
形状に構成したが、第2図に示すように、第1筒
体14および第2筒体15の端部にそれぞれフラ
ンジ部20,21を設け、これらフランジ部2
0,21で溶接するように構成してもよい。
In the above embodiment, the first cylindrical body and the second cylindrical body are configured to fit together, but as shown in FIG. 20 and 21 are provided, and these flange portions 2
It may be configured to weld at 0.21.

〔考案の効果〕[Effect of idea]

含浸型陰極構体の陰極基体を加熱するヒータ部
を同軸に接合される一対の筒体で構成し、陰極基
体側に位置する第1筒体に埋込剤がほぼ完全に充
填され、陰極基体から離れて位置する第2筒体に
埋込剤が存在しないように構成したので、埋込剤
の量が一定でかつ脱落を生じない高信頼性かつ高
品位の所要の含浸型陰極構体を容易に製作するこ
とができる。
The heater part that heats the cathode base of the impregnated cathode assembly is composed of a pair of coaxially joined cylinders, and the first cylinder located on the cathode base side is almost completely filled with the embedding agent, and the embedding agent is completely filled with the embedding agent. Since the structure is such that no embedding agent is present in the second cylindrical body located apart, it is possible to easily create a highly reliable and high-quality impregnated cathode structure in which the amount of embedding agent is constant and does not fall off. It can be manufactured.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はこの考案の一実施例である含浸型陰極
構体の断面図、第2図は他の実施例の要部を示す
断面図、第3図は従来の含浸型陰極構体の断面図
である。 1……電子放射面、2……陰極基体、6……ヒ
ータ、10……ヒータ部、11……ヒータ容器、
12……埋込剤、14……第1筒体、15……第
2筒体。
Fig. 1 is a sectional view of an impregnated cathode assembly which is an embodiment of this invention, Fig. 2 is a sectional view showing the main parts of another embodiment, and Fig. 3 is a sectional view of a conventional impregnated cathode assembly. be. DESCRIPTION OF SYMBOLS 1... Electron emission surface, 2... Cathode base, 6... Heater, 10... Heater part, 11... Heater container,
12... Implanting agent, 14... First cylindrical body, 15... Second cylindrical body.

Claims (1)

【実用新案登録請求の範囲】 高融点多孔質金属基体の空孔部に電子放射物質
が含浸され一端面を電子放射面とする陰極基体を
備え、この陰極基体の他端側にヒータ容器内に耐
熱絶縁性の埋込剤によりヒータが埋込まれたヒー
タ部が取り付けられた含浸型陰極構体において、 上記ヒータ容器は同軸に接合された一対の筒体
で構成され、上記陰極基体側に位置する第1筒体
に上記埋込剤がほぼ完全に充填され、上記陰極基
体から離れて位置する第2筒体に上記埋込剤が存
在しないように構成されていることを特徴とする
含浸型陰極構体。
[Claims for Utility Model Registration] A cathode substrate is provided in which the pores of a high melting point porous metal substrate are impregnated with an electron emitting substance and one end surface serves as an electron emission surface, and the other end of the cathode substrate is provided with a heater container. In an impregnated cathode assembly equipped with a heater part in which a heater is embedded with a heat-resistant insulating embedding material, the heater container is composed of a pair of coaxially joined cylinders, and is located on the cathode base side. An impregnated cathode characterized in that the first cylindrical body is almost completely filled with the embedding agent, and the second cylindrical body located away from the cathode substrate is free of the embedding agent. Structure.
JP3828485U 1985-03-19 1985-03-19 Expired JPH0439646Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3828485U JPH0439646Y2 (en) 1985-03-19 1985-03-19

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3828485U JPH0439646Y2 (en) 1985-03-19 1985-03-19

Publications (2)

Publication Number Publication Date
JPS61156149U JPS61156149U (en) 1986-09-27
JPH0439646Y2 true JPH0439646Y2 (en) 1992-09-17

Family

ID=30545142

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3828485U Expired JPH0439646Y2 (en) 1985-03-19 1985-03-19

Country Status (1)

Country Link
JP (1) JPH0439646Y2 (en)

Also Published As

Publication number Publication date
JPS61156149U (en) 1986-09-27

Similar Documents

Publication Publication Date Title
US2912611A (en) Thermionic cathodes
JP3718321B2 (en) End hat component for magnetron and manufacturing method thereof
JPH0439646Y2 (en)
US20090134800A1 (en) Electrode System for a Lamp
EP1150334B1 (en) Electrode for discharge tube and discharge tube using it
JPH047550Y2 (en)
JPS61216222A (en) Impregnated type cathode composition
JPS61216223A (en) Impregnated type cathode composition
JPS5842141A (en) Pierce type electron gun
JPS62217525A (en) Impregnated cathode
JPS61216221A (en) Impregnated type cathode and its manufacture
JPS6336606Y2 (en)
JPS5842132A (en) Direct-heated dispenser cathode and manufacturing method
JP3137406B2 (en) Manufacturing method of cathode assembly
JPH03250528A (en) Manufacture of impregnated cathode structure
JPS6062034A (en) Hot-cathode frame body
JPH05290717A (en) Impregnation type cathode structure and manufacture thereof
JP4233046B2 (en) Manufacturing method of gas discharge lamp
JPS63211534A (en) Impregnated type cathode structure body
JPS6247930A (en) Manufacture of impregnated cathode structure
JP3353303B2 (en) Impregnated cathode structure
JPH01319227A (en) Manufacture of electron tube cathode
JPH04322029A (en) Impregnated type cathode and manufacture thereof
JPS59108233A (en) Impregnated cathode structure
JPH01109633A (en) Impregnated type cathode structure