JPH02244536A - Manufacture of dispenser cathod - Google Patents
Manufacture of dispenser cathodInfo
- Publication number
- JPH02244536A JPH02244536A JP29476289A JP29476289A JPH02244536A JP H02244536 A JPH02244536 A JP H02244536A JP 29476289 A JP29476289 A JP 29476289A JP 29476289 A JP29476289 A JP 29476289A JP H02244536 A JPH02244536 A JP H02244536A
- Authority
- JP
- Japan
- Prior art keywords
- kinds
- pellet
- blended
- powders selected
- metal powder
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000008188 pellet Substances 0.000 claims abstract description 20
- 239000000843 powder Substances 0.000 claims abstract description 15
- 229910052751 metal Inorganic materials 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 13
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 11
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 9
- -1 aluminum compound Chemical class 0.000 claims abstract description 8
- 229910052715 tantalum Inorganic materials 0.000 claims abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 7
- 229910052788 barium Inorganic materials 0.000 claims abstract description 7
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 7
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 11
- 239000007864 aqueous solution Substances 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 6
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract description 5
- 239000000956 alloy Substances 0.000 abstract description 4
- 229910045601 alloy Inorganic materials 0.000 abstract description 4
- 239000010406 cathode material Substances 0.000 abstract description 4
- 238000002156 mixing Methods 0.000 abstract description 4
- 150000001875 compounds Chemical class 0.000 abstract description 2
- 239000002904 solvent Substances 0.000 abstract description 2
- 150000005323 carbonate salts Chemical class 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 239000011575 calcium Substances 0.000 description 5
- 238000010304 firing Methods 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052716 thallium Inorganic materials 0.000 description 1
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/045—Alloys based on refractory metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
- H01J9/042—Manufacture, activation of the emissive part
- H01J9/047—Cathodes having impregnated bodies
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明はディスペンサー陰極の製造方法に係るものであ
り、詳細には高温熱処理による電子放出効率の低下を抑
制し得るディスペンサー陰極の製造方法に係るものであ
る。[Detailed Description of the Invention] Industrial Application Field The present invention relates to a method of manufacturing a dispenser cathode, and more particularly, to a method of manufacturing a dispenser cathode that can suppress a decrease in electron emission efficiency due to high-temperature heat treatment. be.
従来の技術
第１図に図示されたような一般的なディスペンサー陰極
は、陰極物質であるバリウム、カルシウム、アルミン酸
塩が含まれている多孔性ペレット３、これを貯蔵するカ
ップ２及びヒーター４を内蔵するスリーブ１で構成され
ている。これらの中の重要な部品である上記のペレット
３は、タングステン（Ｗ）等の高融点の金属粉末を焼結
処理してなったものであり、素材自体が高融点の耐熱性
金属であるので大変高い温度の熱処理工程を経ることに
なる。これらのペレットの製造方法には各種の方法があ
る。例えば、タングステン等の耐熱性金属になった多孔
性べＬノットに陰極物質の素材であるＢａＣ０，、、Ｃ
ａＣ０ｚ 、 Ａ＃ ２ＣＯ３を混合してなった混合物
やこの混合物を焼成処理してなったバリウム、カルシウ
ム、アルミン酸塩を溶融含浸させる方法と、タングステ
ン、モリブデン、タリウム等の耐熱金属粉末に陰極物質
の素材を適正比率に混合してなった混合物を所定形状に
圧縮成形した後、これを焼結処理する方法等がある（米
国特許筒４．７３７．６７９号及び第４．４００．６４
８号参照）。BACKGROUND OF THE INVENTION A typical dispenser cathode as shown in FIG. It consists of a built-in sleeve 1. The pellet 3 mentioned above, which is an important part among these, is made by sintering high melting point metal powder such as tungsten (W), and the material itself is a high melting point heat resistant metal. This requires a heat treatment process at extremely high temperatures. There are various methods for producing these pellets. For example, a porous knot made of heat-resistant metal such as tungsten is coated with BaC0,...
aC0z, A# A method of melting and impregnating a mixture formed by mixing CO3, barium, calcium, and aluminate formed by firing this mixture, and a method of melting and impregnating a heat-resistant metal powder such as tungsten, molybdenum, and thallium with a cathode material. There is a method in which a mixture made by mixing materials in an appropriate ratio is compressed into a predetermined shape and then sintered (U.S. Patent Nos. 4.737.679 and 4.400.64).
(See No. 8).
発明が解決しようとする課題
このような従来の製造方法においては１７００℃以上の
焼成処理段階を伴うため、高温処理における負反応に因
って電子放出効率が大変低下してしまうという問題が発
生する。これは自体の溶融温度と他の物質との反応温度
が大変高いＡ Ｉ！ ｚＯｙ（アルミナ）を使用するた
めである。従って、陰極物質の素材としてＡ ｌ 、０
３が使用される限り、上記のような逆作用を起こす高温
の焼成工程を排除することができない。Problems to be Solved by the Invention Since such conventional manufacturing methods involve a step of calcination treatment at temperatures of 1,700°C or higher, a problem arises in that the electron emission efficiency is greatly reduced due to negative reactions during the high-temperature treatment. . This is because the melting temperature of AI itself and the reaction temperature with other substances are very high. This is because zOy (alumina) is used. Therefore, as the material for the cathode material, A l ,0
As long as No. 3 is used, a high-temperature firing step that causes the above-mentioned adverse effects cannot be excluded.
本発明の目的は、高温熱処理による陰極物質の電子放出
効率の低下を抑制し得るディスペンサー陰極の製造方法
を提供することである。An object of the present invention is to provide a method for manufacturing a dispenser cathode that can suppress reduction in electron emission efficiency of a cathode material due to high-temperature heat treatment.
課題を解決するための丁７段
上記の目的を達成するための本発明のディスペンサー陰
極の製造方法は、Ｍｏ、Ｔａ、Ｗ中から択一された金属
粉末又はＭｏ、Ｔａ、Ｗ中から選択された少なくとも２
種の合金粉末にＳｒ、Ｂａ。A method for manufacturing a dispenser cathode according to the present invention to achieve the above object includes a metal powder selected from Mo, Ta, and W, or a metal powder selected from Mo, Ta, and W. at least 2
Sr and Ba are added to the seed alloy powder.
Ｃａの炭酸塩中から選択された少なくとも２種の混合粉
末を混合してなった混合体、又はこれの成形体であるペ
レットをアルミニウム化合物が溶解されている水溶液に
浸して水溶液中のアルミニウム成分がＬ記金属の混合体
またはこれの成形体であるペレットに浸漬されるように
する工程を包含することである。A mixture prepared by mixing at least two types of mixed powder selected from Ca carbonates, or a pellet formed from the mixture, is immersed in an aqueous solution in which an aluminum compound is dissolved, so that the aluminum component in the aqueous solution is dissolved. This method includes the step of immersing a mixture of the metals listed in L or pellets formed therein.
実施例１：
５ｒＮＯ＝、 ＢａＮ０ａ、 ＣａＮ０＋の混合液にＮ
ａＣ０，を溶解させて上記Ｓｒ、Ｂａ、Ｃａがカーボネ
ー［・（炭酸塩）と共に析出されるようにし、その析出
された炭酸塩化合物を回収乾燥した後、Ｍｏ、Ｔａ。Example 1: Adding N to a mixture of 5rNO=, BaN0a, and CaN0+
aC0, is dissolved so that the above-mentioned Sr, Ba, and Ca are precipitated together with carbonate [.(carbonate), and the precipitated carbonate compound is collected and dried, and then Mo and Ta are dissolved.
Ｗ等の金属粉末と混合して所定形状のペレットに加圧成
形する。そして、Ａｌ化合物を適当な溶媒に溶解させて
上記ペレットを浸して浸漬させ、次いで１２００−１３
００℃程度の温度帯で焼成させてＣＯ８を除去すること
によってペレットを完成する。It is mixed with metal powder such as W and pressure-molded into pellets of a predetermined shape. Then, the above pellets were immersed in the Al compound dissolved in a suitable solvent, and then 1200-13
Pellets are completed by firing at a temperature range of about 00°C to remove CO8.
実施例２：
５ｖＮＯ，、ＢａＮ０＝、 ＣａＮ０ｚの混合液にＮａ
Ｃ０＊を溶解させて化学反応によって上記Ｓｒ、Ｂａ、
Ｃａが炭酸塩と共に析出されるようにしてこれを回収乾
燥し、その乾燥された炭酸塩化合物をＭｏ 、 Ｔ’ａ
。Example 2: Adding Na to the mixture of 5vNO,, BaN0=, CaN0z
The above Sr, Ba,
Ca is collected and dried so that it is precipitated together with carbonate, and the dried carbonate compound is converted into Mo and T'a.
.
Ｗ等の金属粉末と混合して所定形状のペレットに加圧成
形する。そして、ペレットを１２００〜１３００℃に焼
成してＣ０２を除去するとともにこれをアルミニウム化
合物が溶解されてある水溶液に浸して浸漬させた後、乾
燥させ、後続工程で１２００〜１３００℃より若干高い
温度の水素雰囲気で還元処理をして残余の酸素原子を除
去する。It is mixed with metal powder such as W and pressure-molded into pellets of a predetermined shape. Then, the pellets are calcined at 1200-1300°C to remove CO2, and the pellets are immersed in an aqueous solution in which an aluminum compound is dissolved, dried, and heated at a temperature slightly higher than 1200-1300°C in the subsequent process. Residual oxygen atoms are removed by reduction treatment in a hydrogen atmosphere.
実施例３：
５ｒＮＯ３，ＢａＮ０ｚ、 ＣａＮ０：＋の混合液にＮ
ａＮ０：＋を溶解させて化学反応によって上記Ｓｒ、Ｂ
ａ、Ｃａが炭酸塩と共に析出されるようにしてこれを回
収乾燥し、その乾燥された炭酸塩化合物にＭｏ、ＴａＷ
等の金属粉末を混合し、次いで上記混合物をアルミニウ
ム化合物が溶解されてある水溶液に浸し７て浸漬させ、
これを更に再回収乾燥させる。そして、上記混合物を所
定形状のペレットに加工した後にこれを焼成及び還元工
程を通じて完成する。Example 3: Adding N to the mixed solution of 5rNO3, BaN0z, CaN0:+
aN0:+ is dissolved and the above Sr, B is formed by a chemical reaction.
a, Ca is collected and dried so that it is precipitated together with carbonate, and Mo, TaW are added to the dried carbonate compound.
and the like, and then immerse the mixture in an aqueous solution in which an aluminum compound is dissolved,
This is further recovered and dried. After processing the mixture into pellets of a predetermined shape, the pellets are completed through a firing and reduction process.
このような過程を通じて形成されるペレット３は、第１
図に図示されたようにスリーブ１の先端部に結合された
カフブ２に挿入された後に抵抗溶接またはレーザー溶接
によって固定される。The pellets 3 formed through this process are the first
As shown in the figure, the cuff 2 is inserted into the cuff 2 connected to the tip of the sleeve 1, and then fixed by resistance welding or laser welding.
発明の効果
このように本発明によると、従来とは異なり１７００℃
以上の熱処理が必要なく、僅が１２００〜１３００℃程
度の温度帯で全ての焼成工程及び還元工程が成されるよ
うになる。したがって、高温熱処理における負反応に囚
って励起されていた低い電子放出の効率は大幅に向上さ
れ、よりよい性能の陰極製作が可能である。Effects of the Invention As described above, according to the present invention, unlike the conventional method, the temperature
There is no need for the above heat treatment, and all the firing steps and reduction steps can be performed at a temperature range of only about 1200 to 1300°C. Therefore, the efficiency of low electron emission that is excited due to negative reactions during high-temperature heat treatment is greatly improved, and a cathode with better performance can be manufactured.
第１図は一般的なディスペンサー陰極の断面図である。 １・・・・・・スリーブ、 ２・・・・・・カップ、 ３・・・・・・ペレット、 ４・・・・・・ヒーター 第 FIG. 1 is a cross-sectional view of a typical dispenser cathode. 1...Sleeve, 2...Cup, 3... Pellets, 4... Heater No.
Claims (1)
、Ｔａ、Ｗ中の選択された最小に２種以上の合金粉末に
Ｓｒ、Ｂａ、Ｃａの炭酸塩中から選択された最小に２種
以上の混合粉末を混合してなった混合体又は、この成形
体であるペレットをアルミニウム化合物が溶解されてあ
る水溶液に浸して水溶液中のアルミニウム成分が上記金
属混合体またはこれの成形体であるペレットに浸漬され
るようにする工程を包含することを特徴とするディスペ
ンサー陰極の製造方法。(1) Selected metal powder among Mo, Ta, and W or Mo
, Ta, and W, and a mixture of at least two or more selected from carbonates of Sr, Ba, and Ca, or a mixture thereof; It is characterized by including the step of immersing a pellet, which is a molded object, in an aqueous solution in which an aluminum compound is dissolved, so that the aluminum component in the aqueous solution is immersed into the metal mixture or the pellet, which is a molded object thereof. A method for manufacturing a dispenser cathode.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR8815259A KR910003699B1 (en) | 1988-11-19 | 1988-11-19 | Manufacturing method of dispenser cathode |
| KR15259 | 1988-11-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02244536A true JPH02244536A (en) | 1990-09-28 |
Family
ID=19279420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29476289A Pending JPH02244536A (en) | 1988-11-19 | 1989-11-13 | Manufacture of dispenser cathod |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH02244536A (en) |
| KR (1) | KR910003699B1 (en) |
| GB (1) | GB2226573B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2583161C1 (en) * | 2014-12-30 | 2016-05-10 | Акционерное общество "Научно-производственное предприятие "Исток" имени А.И. Шокина" (АО "НПП "Исток" им. Шокина") | Method for producing metal porous cathode |
| RU2724980C1 (en) * | 2019-10-15 | 2020-06-29 | Акционерное общество "Научно-производственное предприятие "Алмаз" (АО "НПП "Алмаз") | Two-layer dispensed cathode and method of its manufacturing |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS551029A (en) * | 1978-06-19 | 1980-01-07 | New Japan Radio Co Ltd | Manufacture of impregnated cathode |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1465473A (en) * | 1922-07-12 | 1923-08-21 | Thomas C Hansen | Means for molding backings for artificial teeth |
| US2813807A (en) * | 1954-07-19 | 1957-11-19 | Philips Corp | Method of making a dispenser cathode |
| NL274464A (en) * | 1961-02-07 | |||
| IT712524A (en) * | 1962-08-24 |
-
1988
- 1988-11-19 KR KR8815259A patent/KR910003699B1/en not_active IP Right Cessation
-
1989
- 1989-10-30 GB GB8924407A patent/GB2226573B/en not_active Expired - Lifetime
- 1989-11-13 JP JP29476289A patent/JPH02244536A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS551029A (en) * | 1978-06-19 | 1980-01-07 | New Japan Radio Co Ltd | Manufacture of impregnated cathode |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2226573B (en) | 1992-12-02 |
| KR910003699B1 (en) | 1991-06-08 |
| GB2226573A (en) | 1990-07-04 |
| GB8924407D0 (en) | 1989-12-20 |
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