JPS6358725A - Heater for electron tube cathode - Google Patents
Heater for electron tube cathodeInfo
- Publication number
- JPS6358725A JPS6358725A JP61201415A JP20141586A JPS6358725A JP S6358725 A JPS6358725 A JP S6358725A JP 61201415 A JP61201415 A JP 61201415A JP 20141586 A JP20141586 A JP 20141586A JP S6358725 A JPS6358725 A JP S6358725A
- Authority
- JP
- Japan
- Prior art keywords
- heater
- alumina
- layer
- cathode
- whiskers
- 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
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 40
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical group [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 15
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 7
- 229910052721 tungsten Inorganic materials 0.000 claims description 6
- 239000010937 tungsten Substances 0.000 claims description 6
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 4
- 238000009413 insulation Methods 0.000 abstract description 15
- 239000000203 mixture Substances 0.000 abstract description 6
- 238000005245 sintering Methods 0.000 abstract description 5
- 239000002245 particle Substances 0.000 abstract description 4
- 239000011248 coating agent Substances 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 239000006185 dispersion Substances 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 17
- 238000001816 cooling Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 239000011247 coating layer Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 101100514056 Rhodobacter capsulatus modD gene Proteins 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 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
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Solid Thermionic Cathode (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、芯線を被覆するアルミナ絶縁層にクランクが
生じ難く、芯線の断線や、陰極とヒータの間の絶縁不良
が発生し難い電子管陰極用ヒータに関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides an electron tube cathode in which cranking is less likely to occur in the alumina insulating layer covering the core wire, breakage of the core wire, and poor insulation between the cathode and the heater. related to heaters.
電子管の傍熱形陰極に用いられるヒータは、タングステ
ン芯線の熱膨張係数とアルミナの熱膨張係数とが相違す
るために、ヒータの加熱、冷却の度に内部に大きな熱応
力が発生し、そのため、加熱、冷却のサイクルを繰り返
している間に、漸次、アルミナ被覆にクランクが発生し
、更に、ヒータの断線や、ヒータと陰極の間の絶縁不良
などに進展する事故が発生していた。In the heater used in the indirectly heated cathode of an electron tube, the thermal expansion coefficient of the tungsten core wire is different from that of alumina, so a large thermal stress is generated inside the heater each time the heater is heated or cooled. As the heating and cooling cycles were repeated, cracks gradually occurred in the alumina coating, which led to further accidents such as disconnection of the heater and poor insulation between the heater and the cathode.
このような問題の対策として、従来から、アルミナの中
に他の材料を混合して焼結することが試みられてきた。As a countermeasure to such problems, attempts have been made to mix other materials into alumina and sinter the mixture.
例えば、特公昭４４−８７８１号公報には、アルミナに
０．１〜０．８ ｆｆｌｆｆｉ％の酸化カルシウムを混
合して焼結することが記載されている。しかし、近年、
電子管の高性能化に伴って、ヒータ使用温度を高くする
傾向にあり、焼結したアルミナ絶縁被覆層にとってクラ
ックが一層生じ易い条件下で使用されるようになって、
上記のような手段では、ヒータのアルミナのクランク発
生を抑制するには不十分になっている。For example, Japanese Patent Publication No. 44-8781 describes that 0.1 to 0.8 fflffi% of calcium oxide is mixed with alumina and sintered. However, in recent years,
As the performance of electron tubes improves, there is a trend toward higher operating temperatures for heaters, and the sintered alumina insulation coating layer is used under conditions that are more likely to cause cracks.
The above-mentioned measures are insufficient to suppress the occurrence of cranking of alumina in the heater.
本発明は上記のような従来の電子管陰極用ヒータの問題
点すなわち使用中のヒータの加熱、冷却の繰り返しに伴
うアルミナ絶縁焼結層のクラックの発生、ヒータ芯線の
断線、更に絶縁不良の発生などを解決し、アルミナ絶縁
液ｒｉ層にクラックが発生せず、従ってヒータ芯線の断
線も、絶縁不良も発生しないようにした電子管陰極用ヒ
ータを提供することを目的とする。The present invention solves the problems of conventional electron tube cathode heaters as described above, such as cracks in the alumina insulation sintered layer due to repeated heating and cooling of the heater during use, disconnection of the heater core wire, and poor insulation. It is an object of the present invention to provide a heater for an electron tube cathode in which cracks do not occur in the alumina insulating liquid RI layer, and therefore neither disconnection of the heater core wire nor poor insulation occurs.
上記問題点を解決するために本発明においては、ヒータ
芯線を、細長く、かつ強度の高いウィスカ（ｗｈｉｓｋ
ｅｒ）を添加、分散させたアルミナ層で被覆して焼結す
ることとした。In order to solve the above problems, in the present invention, the heater core wire is made of elongated and strong whisker.
er) was added and dispersed in an alumina layer and sintered.
この目的に使用するには、絶縁層を形成するアルミナと
高温でも反応しない点、高温息空中での使用に耐える点
などから、タングステン、アルミナ、炭化ケイ素のウィ
スカが適する。For this purpose, tungsten, alumina, and silicon carbide whiskers are suitable because they do not react with the alumina forming the insulating layer even at high temperatures and can withstand use in high-temperature air.
ウィスカ添加量は１〜３０ｍｏｌχとする。１ｍｏ１％
以下では添加した効果が得られず、３０ｍｏｌＸ以上に
なるとウィスカの分散性が悪く、耐熱衝撃特性が低下す
るからである。最も良好な耐熱衝撃特性が得られる、好
ましい添加９の範囲は１０〜１５ｍｏｌχである。The amount of whiskers added is 1 to 30 molχ. 1mo1%
This is because if the amount is less than 30 molX, the effect of addition cannot be obtained, and if it is more than 30 molX, the dispersibility of whiskers is poor and the thermal shock resistance is deteriorated. The preferred range of addition 9, which provides the best thermal shock resistance, is 10 to 15 molχ.
ウィスカの成分が炭化ケイ素の場合には、タングステン
芯線と反応する可能性がある。また、ウィスカの成分が
タングステンの場合には、ウィスカを添加分散させたア
ルミナ焼結層の絶縁性が低下する恐れがある。これらの
ウィスカを使用する場合には、芯線との反応や絶縁性の
低下を防止するために、タングステン芯線と、ウィスカ
を添加、分散させたアルミナ層との中間に、他物を添加
してないアルミナだけの層を介在させる。If the whisker component is silicon carbide, there is a possibility that it will react with the tungsten core wire. Furthermore, if the whisker component is tungsten, there is a risk that the insulation properties of the alumina sintered layer to which the whiskers are added and dispersed will be reduced. When using these whiskers, do not add any other substances between the tungsten core wire and the alumina layer in which the whiskers are added and dispersed, in order to prevent reactions with the core wire and deterioration of insulation. A layer of only alumina is interposed.
強度の高いウィスカを添加分散させて焼結したアルミナ
絶縁被覆層では、ヒータの昇温または冷却過程において
、熱応力によって破壊が開始する（クラックが生ずる）
際に必要なエネルギー値が増大し、クランク発生が抑制
される。また細くて丈夫なウィスカの添加、分散により
、アルミナ焼結層の弾性率が向上し、熱ｆｉｉ撃損傷抵
抗が大きくなり、クランクの伝搬が抑制される。The alumina insulation coating layer, which is sintered with strong whiskers added and dispersed, begins to break down (cracks occur) due to thermal stress during the heating or cooling process of the heater.
In this case, the required energy value increases and cranking is suppressed. Furthermore, the addition and dispersion of thin and strong whiskers improves the elastic modulus of the alumina sintered layer, increases resistance to heat damage, and suppresses crank propagation.
第１図は本発明一実施例のアルミナ焼結被覆層の拡大断
面図を示し、１はタングステン芯線、２はアルミナ粒子
、３はウィスカである。ヒータのタングステン芯線ｌに
、アルミナに炭化ケイ素のウィスカ３を１５ｍｏｌχ加
えた混合物を電着し、更に放射能を高めるためのダーク
アルミナ層を塗布した後、１７００°Ｃで焼結し、炭化
ケイ素ウィスカ３が分散したアルミナ焼結層を形成する
。ウィスカ２として炭化ケイ素を用いた場合、炭化ケイ
素がタングステンと反応するのを防止するために、タン
グステンと直接接する第１層として何も混合してないア
ルミナ層を設ける。また、タングステンのウィスカを用
いた場合には、ヒータと陰極の間の絶縁を保つために、
最外層に何も混合しないアルミナ層を設けることが好ま
しい。FIG. 1 shows an enlarged cross-sectional view of a sintered alumina coating layer according to an embodiment of the present invention, in which 1 is a tungsten core wire, 2 is an alumina particle, and 3 is a whisker. A mixture of alumina and silicon carbide whiskers 3 added in an amount of 15 molχ was electrodeposited onto the tungsten core wire of the heater, and a dark alumina layer was further applied to increase the radioactivity, and then sintered at 1700°C to form silicon carbide whiskers. 3 is dispersed to form an alumina sintered layer. When silicon carbide is used as whisker 2, in order to prevent silicon carbide from reacting with tungsten, an alumina layer without any mixture is provided as a first layer in direct contact with tungsten. In addition, when using tungsten whiskers, in order to maintain insulation between the heater and the cathode,
It is preferable to provide an alumina layer in which nothing is mixed as the outermost layer.
アルミナ粒子２とウィスカ３の混合物をタングステン芯
線１に付着させる方法は電着法に限らず、吹付は法また
はは浸漬法を用いても良い。The method for adhering the mixture of alumina particles 2 and whiskers 3 to the tungsten core wire 1 is not limited to the electrodeposition method, and a spraying method or a dipping method may also be used.
焼結温度は、１６００〜１７００℃が好ましい。１６０
０℃以下では焼結が進行せず、１７００℃以上では焼結
による収縮でアルミナ焼結層にクラックが生ずる。The sintering temperature is preferably 1600 to 1700°C. 160
At temperatures below 0°C, sintering does not proceed, and at temperatures above 1700°C, cracks occur in the alumina sintered layer due to shrinkage due to sintering.
このようにして製作したヒータを用いた傍熱形陰極を、
５分間通電加熱−１５分間通電中止冷却の強制寿命試験
をしたところ、従来のヒータが２０００時間で、ヒータ
断線やヒータ・陰極間絶縁不良等が発生したのに対して
、本実施例ヒータは５０００時間経過後も不良が発生し
なかった。An indirectly heated cathode using the heater manufactured in this way,
When we conducted a forced life test of heating with electricity for 5 minutes and cooling with electricity stopped for 15 minutes, we found that the conventional heater suffered from heater disconnection and poor insulation between the heater and cathode after 2,000 hours, whereas the heater of this example lasted only 5,000 hours. No defects occurred even after the lapse of time.
以上説明したように本発明によれば、ヒータ使用中に、
昇温・冷却の過程を繰り返しても、ヒ−夕のアルミナ焼
結絶縁層中でのクランクの発生と其の進展が抑制され、
ヒータ芯線の断線や、ヒータと陰極の間の絶縁不良が発
生し難くなり、ヒータの寿命が延び、信頼性が向上する
。As explained above, according to the present invention, while using the heater,
Even if the process of heating and cooling is repeated, the occurrence and progression of cranks in the alumina sintered insulation layer of the heater is suppressed.
Breakage of the heater core wire and poor insulation between the heater and the cathode are less likely to occur, extending the life of the heater and improving its reliability.
第１図は本発明一実施例のアルミナ絶縁被覆層の拡大断
面図である。
１・・・タングステン芯線、 ２−アルミナ粒子、３−
・ウィスカ。FIG. 1 is an enlarged sectional view of an alumina insulating coating layer according to an embodiment of the present invention. 1...Tungsten core wire, 2-Alumina particles, 3-
・Whisker.
Claims (1)
絶縁層で被覆した電子管陰極用ヒータにおいて、焼結さ
せるアルミナの中にウィスカを添加、分散させたものを
用いたことを特徴とする電子管陰極用ヒータ。 ２、タングステン、アルミナ、炭化ケイ素の何れかを成
分とするウィスカのなかの少なくとも１種類を用いた特
許請求の範囲第１項記載の電子管陰極用ヒータ。 ３、ウィスカを１〜３０ｍｏｌ％添加した特許請求の範
囲第１項記載の電子管陰極用ヒータ。 ４、ウィスカを１０〜１５ｍｏｌ％添加した特許請求の
範囲第１項記載の電子管陰極用ヒータ。 ５、タングステン芯線とウィスカを分散したアルミナ層
の中間に、アルミナだけからなる層を介在させた特許請
求の範囲第１項記載の電子管陰極用ヒータ。[Claims] 1. In an electron tube cathode heater in which a required portion of a tungsten core wire is covered with a sintered alumina insulating layer, whiskers are added and dispersed in the sintered alumina. Characteristic heater for electron tube cathode. 2. The heater for an electron tube cathode according to claim 1, which uses at least one type of whisker selected from the group consisting of tungsten, alumina, and silicon carbide. 3. The heater for an electron tube cathode according to claim 1, in which whiskers are added in an amount of 1 to 30 mol %. 4. The heater for an electron tube cathode according to claim 1, wherein 10 to 15 mol% of whiskers are added. 5. The heater for an electron tube cathode according to claim 1, wherein a layer consisting only of alumina is interposed between the tungsten core wire and the alumina layer in which whiskers are dispersed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61201415A JPS6358725A (en) | 1986-08-29 | 1986-08-29 | Heater for electron tube cathode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61201415A JPS6358725A (en) | 1986-08-29 | 1986-08-29 | Heater for electron tube cathode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6358725A true JPS6358725A (en) | 1988-03-14 |
Family
ID=16440705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61201415A Pending JPS6358725A (en) | 1986-08-29 | 1986-08-29 | Heater for electron tube cathode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6358725A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01304635A (en) * | 1988-06-01 | 1989-12-08 | Hitachi Ltd | Heater for heating cathode of cathode-ray tube and cathode-ray tube using same |
| KR100393990B1 (en) * | 2000-07-11 | 2003-08-09 | 엘지전자 주식회사 | heater for CRT |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59149602U (en) * | 1983-03-24 | 1984-10-06 | 株式会社村田製作所 | Sealed structure of electronic components |
| WO2008012873A1 (en) * | 2006-07-25 | 2008-01-31 | Panasonic Corporation | Circuit board and portable electronic apparatus |
| JP2008084964A (en) * | 2006-09-26 | 2008-04-10 | Alps Electric Co Ltd | Manufacturing method for high-frequency unit and high-frequency unit |
| JP2009009982A (en) * | 2007-06-26 | 2009-01-15 | Toshiba Lighting & Technology Corp | Printed wiring board, electrical instrument, and discharge lamp lighting apparatus |
| JP2010153448A (en) * | 2008-12-24 | 2010-07-08 | Shindengen Electric Mfg Co Ltd | Electronic circuit device and manufacturing method for the same |
-
1986
- 1986-08-29 JP JP61201415A patent/JPS6358725A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59149602U (en) * | 1983-03-24 | 1984-10-06 | 株式会社村田製作所 | Sealed structure of electronic components |
| WO2008012873A1 (en) * | 2006-07-25 | 2008-01-31 | Panasonic Corporation | Circuit board and portable electronic apparatus |
| JP2008084964A (en) * | 2006-09-26 | 2008-04-10 | Alps Electric Co Ltd | Manufacturing method for high-frequency unit and high-frequency unit |
| JP2009009982A (en) * | 2007-06-26 | 2009-01-15 | Toshiba Lighting & Technology Corp | Printed wiring board, electrical instrument, and discharge lamp lighting apparatus |
| JP2010153448A (en) * | 2008-12-24 | 2010-07-08 | Shindengen Electric Mfg Co Ltd | Electronic circuit device and manufacturing method for the same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01304635A (en) * | 1988-06-01 | 1989-12-08 | Hitachi Ltd | Heater for heating cathode of cathode-ray tube and cathode-ray tube using same |
| KR100393990B1 (en) * | 2000-07-11 | 2003-08-09 | 엘지전자 주식회사 | heater for CRT |
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