JPH0218535B2 - - Google Patents
Info
- Publication number
- JPH0218535B2 JPH0218535B2 JP8486882A JP8486882A JPH0218535B2 JP H0218535 B2 JPH0218535 B2 JP H0218535B2 JP 8486882 A JP8486882 A JP 8486882A JP 8486882 A JP8486882 A JP 8486882A JP H0218535 B2 JPH0218535 B2 JP H0218535B2
- Authority
- JP
- Japan
- Prior art keywords
- end shield
- filament
- melting point
- ruthenium
- magnetron
- 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
Links
- 238000005219 brazing Methods 0.000 claims description 27
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 26
- 229910052751 metal Inorganic materials 0.000 claims description 22
- 239000002184 metal Substances 0.000 claims description 22
- 238000002844 melting Methods 0.000 claims description 19
- 229910052759 nickel Inorganic materials 0.000 claims description 12
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 239000011733 molybdenum Substances 0.000 claims description 10
- 239000006023 eutectic alloy Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 3
- 229910001182 Mo alloy Inorganic materials 0.000 claims description 2
- 229910000929 Ru alloy Inorganic materials 0.000 claims description 2
- 230000008018 melting Effects 0.000 description 18
- 239000000945 filler Substances 0.000 description 14
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 11
- 229910052707 ruthenium Inorganic materials 0.000 description 11
- 125000006850 spacer group Chemical group 0.000 description 10
- 229910052750 molybdenum Inorganic materials 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000005496 eutectics Effects 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- FPZWZCWUIYYYBU-UHFFFAOYSA-N 2-(2-ethoxyethoxy)ethyl acetate Chemical compound CCOCCOCCOC(C)=O FPZWZCWUIYYYBU-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- OUFGXIPMNQFUES-UHFFFAOYSA-N molybdenum ruthenium Chemical compound [Mo].[Ru] OUFGXIPMNQFUES-UHFFFAOYSA-N 0.000 description 1
- 150000002815 nickel Chemical class 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- WLTSUBTXQJEURO-UHFFFAOYSA-N thorium tungsten Chemical compound [W].[Th] WLTSUBTXQJEURO-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/15—Cathodes heated directly by an electric current
Landscapes
- Solid Thermionic Cathode (AREA)
- Microwave Tubes (AREA)
Description
【発明の詳細な説明】
本発明はマグネトロン、特にマグネトロン陰極
構体の接合部構造に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetron, and more particularly to a joint structure of a magnetron cathode assembly.
第１図および第２図は従来のマグネトロンの陰
極構体の一例を示す要部断面構成図である。これ
らの図において、１は熱電子を放射するらせん状
のフイラメント、２はフイラメント１の一端を保
持する上部エンドシールド、３はフイラメント１
の他端を保持する下部エンドシールド、３ａは下
部エンドシールド３の中空孔、４は上部エンドシ
ールド２を支持しかつフイラメント１に所定の電
力を通電するリードを兼ねたセンターサポート、
５は下部エンドシールド３を支持しかつフイラメ
ント１に所定の電力を通電するリードを兼ねたサ
イドサポート、第２図において、６はセンターサ
ポート４とサイドサポート５、下部エンドシール
ド３とを固定し外部からの振動、衝撃によるセン
ターサポート４、サイドサポート５の振れを防止
し、ひいては脆いフイラメント１の断線を防ぐ為
の絶縁スペーサ、７は絶縁スペーサ６の落下を防
止するためにセンターサポート４に設けた溝４ａ
に取付けられた金属金具である。 FIGS. 1 and 2 are cross-sectional configuration diagrams of essential parts showing an example of a conventional magnetron cathode structure. In these figures, 1 is a helical filament that emits thermoelectrons, 2 is an upper end shield that holds one end of filament 1, and 3 is filament 1.
a lower end shield that holds the other end; 3a is a hollow hole in the lower end shield 3; 4 is a center support that supports the upper end shield 2 and also serves as a lead for supplying a predetermined power to the filament 1;
5 is a side support that supports the lower end shield 3 and also serves as a lead for supplying a predetermined power to the filament 1. In FIG. An insulating spacer to prevent the center support 4 and side supports 5 from shaking due to vibrations and shocks, and also to prevent breakage of the fragile filament 1. 7 is a groove 4a provided in the center support 4 to prevent the insulating spacer 6 from falling.
It is a metal fitting attached to.
このように構成されたマグネトロン陰極構体に
おいて、前記フイラメント１は通常トリウム−タ
ングステン線などにより形成され、また、上部エ
ンドシールド２、下部エンドシールド３、センタ
ーサポート４およびサイドサポート５はモリブデ
ンまたはタングステンなどの高融点金属によつて
形成されている。そして、フイラメント１の両端
と上部エンドシールド２、下部エンドシールド３
との接合部および上部エンドシールド２とセンタ
ーサポート４との接合部は、ルテニウムとモリブ
デンとの共晶合金ろう材８により接着されて電気
的に接続されている。この場合、この共晶合金ろ
う材８の組成は、ルテニウムが約43重量％、モリ
ブデンが約57重量％で融点は約1945℃であるが、
ルテニウムが30〜50重量％の範囲では共晶ろう材
として十分に機能を有し、またフイラメント１お
よび上、下エンドシールド２，３に対する濡れ性
も極めて良好であり、強固な接続が得られ、極め
て優れたろう材である。 In the magnetron cathode structure constructed in this way, the filament 1 is usually made of thorium-tungsten wire, and the upper end shield 2, lower end shield 3, center support 4, and side supports 5 are made of high-quality materials such as molybdenum or tungsten. It is made of melting point metal. Then, both ends of filament 1, upper end shield 2, lower end shield 3
The joints between the upper end shield 2 and the center support 4 are bonded and electrically connected by a eutectic alloy brazing filler metal 8 of ruthenium and molybdenum. In this case, the composition of the eutectic alloy brazing filler metal 8 is approximately 43% by weight of ruthenium, approximately 57% by weight of molybdenum, and the melting point is approximately 1945°C.
When ruthenium is in the range of 30 to 50% by weight, it has a sufficient function as a eutectic brazing filler metal, and has extremely good wettability to the filament 1 and the upper and lower end shields 2 and 3, resulting in a strong connection. It is an extremely excellent brazing filler metal.
しかしながら、この共晶ろう材は、最も低い低
融点で溶ける共晶点でも約1945℃と高温度であ
り、ろう付の際に用いるタングステンヒータは白
金をろう材として使用したときよりも短寿命とな
つた。また、白金のコストに比較すればルテニウ
ムは廉価となるが、ルテニウムはかなり高価格で
ある。さらには第２図で示すような陰極構体にお
いては、アルミナセラミツクからなる絶縁スペー
サ６を用いたものでは、フイラメント１のろう付
けのときにスペーサ６を高温度から保護するため
にセンターサポート４の下方に点線で示すように
スペーサ６′をろう付け部分よりも遠ざけた位置
に配置しておく必要があり、ろう付け完了後に下
エンドシールド３に嵌合させて金具７で固定させ
ていた。 However, this eutectic brazing material has a high temperature of approximately 1945°C even at its lowest melting point, and the tungsten heater used during brazing has a shorter lifespan than when platinum is used as the brazing material. Summer. Furthermore, although ruthenium is inexpensive compared to platinum, ruthenium is quite expensive. Furthermore, in the cathode structure shown in FIG. 2, when the insulating spacer 6 made of alumina ceramic is used, the spacer 6 is placed under the center support 4 in order to protect the spacer 6 from high temperatures when the filament 1 is brazed. As shown by the dotted line in , it is necessary to place the spacer 6' at a position farther from the brazed portion, and after the brazing is completed, it is fitted into the lower end shield 3 and fixed with the metal fitting 7.
このように共晶合金ろう材８の融点が約1945℃
と極めて高いことから、
(1) ろう付け時のヒータの使用寿命が短かくな
る。 In this way, the melting point of the eutectic alloy brazing filler metal 8 is approximately 1945℃.
(1) The service life of the heater during brazing will be shortened.
(2) ルテニウムが比較的高価であり、より廉価な
ろう材が要求されている。(2) Ruthenium is relatively expensive, and cheaper brazing filler metals are required.
(3) アルミナセラミツクの焼結温度が約1780℃
で、これを陰極に用いるためには約1780℃以下
の融点のろう材が必要となる。(3) The sintering temperature of alumina ceramic is approximately 1780℃
To use this as a cathode, a brazing material with a melting point of approximately 1780°C or lower is required.
などの問題があつた。There were problems such as.
したがつて本発明は、ルテニウムとモリブデン
との共晶合金ろうにニツケルを重量％で５〜50％
の範囲で添加することによつて、本来の特性を低
減させることなく、融点を低下させ、マグネトロ
ン陰極構体を低コストで製作可能にしたマグネト
ロンを提供することを目的としている。 Therefore, in the present invention, 5 to 50% by weight of nickel is added to the eutectic alloy brazing material of ruthenium and molybdenum.
It is an object of the present invention to provide a magnetron in which the melting point is lowered without reducing the original characteristics by adding in a range of 1 to 100%, and the magnetron cathode structure can be manufactured at low cost.
以下図面を用いて本発明の実施例を説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第３図は本発明によるマグネトロンの陰極構体
の一例を示す要部断面構成図であり、前述の図と
同記号は同一要素となるのでその説明は省略す
る。同図において、フイラメント１と上部エンド
シールド２との接合部、フイラメント１と下部エ
ンドシールド３との接合部、および上部エンドシ
ールド２とセンターサポート４との各接合部に
は、例えばルテニウム粉末を約43重量％、モリブ
デン粉末を約57重量％を含む共晶割合の混合粉
に、ルテニウム、モリブデンよりも融点の低いニ
ツケル粉末を50〜５重量％の範囲で添加した組成
物に例えばカルビトールアセテートなどのバイン
ダーを加えてペースト状に生成したろう材９を塗
布して乾燥し、加熱して融着固化されている。こ
の場合、融着固化されたろう材９は、ルテニウム
とモリブデンとの共晶合金ろうにニツケルを添加
することによつて、第４図に示すようにニツケル
の含有量の増大に伴なつて融点を低下させること
ができる。そして、このニツケル含有量は、約50
重量％を超えると、ニツケルの融点にほぼ等しく
なるとともに、ろう材９がエンドシールド２，３
などのモリブデン母材を食つて表面が凹凸とな
り、品質の低下を招く恐れがあり、またニツケル
含有量が約５重量％以下となると、その分だけル
テニウムの低減効果が少なくなる。したがつて、
ニツケルの含有量は５〜50重量％の範囲が良好で
あり、またこの範囲でニツケルを添加させること
によつて、本来のろう材の特性、すなわちフイラ
メント１、上部エンドシールド２、下部エンドシ
ールド３およびセンターサポート４に対する濡れ
性も全く損ねることなく、ルテニウム・モリブデ
ン共晶合金ろうよりも低い融点を有するろう材を
得ることができた。発明者の実験によると、ニツ
ケル含有量が約５重量％では融点が約1865℃、約
30重量％では融点が約1630℃、約50重量％では約
1525℃でありNiの添加量に相応して、融点を低
下させることがわかつた。従つて、前述のタング
ステンヒータの寿命をのばす目的には、Niを５
％以上加えることにより顕著な効果をもたらし、
スペーサ６を形成するアルミナセラミツクの保護
の為には、Niを10％以上加えることによつて、
効果を得ることができる。また、このようにろう
材９の融点を低下させることにより、ろう付時に
スペーサ６を高温度から保護させるための上下移
動させる工程が不要となり、組立工数を低減させ
ることができるとともに、スペーサ６を支持させ
る金具７（第２図参照）が不要となり、組立部品
数を低減させることができる。さらには、第３図
において、ろう材９の融点の低下に伴ない、第２
図で示す金具７を不要とすることによつて、機械
的強度の弱いフイラメント１を固定させる下部エ
ンドシールド３とセンターサポート４との間にス
ペーサ６を、センターサポート４に前述の溝４ａ
及び金具７を設けることなく、折曲部４ａによつ
て嵌合固定することができるので、フイラメント
１の支持構造としてのセンターサポート４および
サイドサポート５のリード径を細くすることがで
きる。したがつてモリブデン材の使用量も低減で
き、廉価な陰極構体が得られる。 FIG. 3 is a cross-sectional configuration diagram of essential parts showing an example of a cathode assembly of a magnetron according to the present invention. Since the same symbols as those in the above-mentioned figures represent the same elements, a description thereof will be omitted. In the figure, approximately ruthenium powder is applied to the joints between the filament 1 and the upper end shield 2, the joints between the filament 1 and the lower end shield 3, and the joints between the upper end shield 2 and the center support 4. For example, carbitol acetate is added to a composition in which 50 to 5% by weight of nickel powder, which has a melting point lower than that of ruthenium and molybdenum, is added to a mixed powder with a eutectic ratio of 43% by weight and about 57% by weight of molybdenum powder. A brazing filler metal 9 made into a paste by adding a binder is applied, dried, and fused and solidified by heating. In this case, the melting point of the fused and solidified brazing filler metal 9 decreases as the content of nickel increases, as shown in FIG. 4, by adding nickel to a eutectic alloy of ruthenium and molybdenum. can be lowered. And this nickel content is about 50
If it exceeds the weight percentage, the melting point will be almost equal to that of nickel, and the brazing filler metal 9 will melt into the end shields 2 and 3.
It eats away at the molybdenum base material, making the surface uneven, which may lead to deterioration in quality, and if the nickel content is less than about 5% by weight, the effect of reducing ruthenium will decrease accordingly. Therefore,
The content of nickel is preferably in the range of 5 to 50% by weight, and by adding nickel in this range, the original properties of the brazing filler metal, i.e., filament 1, upper end shield 2, lower end shield 3, can be improved. Moreover, it was possible to obtain a brazing material having a melting point lower than that of the ruthenium-molybdenum eutectic alloy brazing material without impairing its wettability to the center support 4 at all. According to the inventor's experiments, when the nickel content is approximately 5% by weight, the melting point is approximately 1865℃, approximately
At 30% by weight, the melting point is approximately 1630℃, and at approximately 50% by weight, it is approximately
It was found that the melting point was lowered in proportion to the amount of Ni added. Therefore, for the purpose of extending the life of the tungsten heater mentioned above, N i should be added to 5
By adding % or more, it brings about a remarkable effect,
In order to protect the alumina ceramic forming the spacer 6, by adding 10% or more of Ni ,
effect can be obtained. In addition, by lowering the melting point of the brazing filler metal 9 in this way, the step of moving the spacer 6 up and down to protect it from high temperatures during brazing is no longer necessary, and the number of assembly steps can be reduced. The supporting metal fitting 7 (see FIG. 2) is not required, and the number of assembled parts can be reduced. Furthermore, in FIG. 3, as the melting point of the brazing filler metal 9 decreases, the second
By eliminating the need for the metal fitting 7 shown in the figure, a spacer 6 is provided between the lower end shield 3 and the center support 4, which fixes the filament 1 with low mechanical strength, and the groove 4a described above is provided in the center support 4.
Since fitting and fixing can be performed by the bent portions 4a without providing the metal fittings 7, the lead diameters of the center support 4 and side supports 5, which serve as support structures for the filament 1, can be made thinner. Therefore, the amount of molybdenum material used can be reduced, and an inexpensive cathode structure can be obtained.
以上説明したように本発明によるマグネトロン
によれば、ルテニウムとモリブデンとの共晶合金
ろう材よりも低融点でフイラメントとエンドシー
ルドとの間およびエンドシールドとリードとの間
の接合を行うことが出来るので、ろう付け時使用
するヒータの寿命を長くすることができる。ま
た、アルミナセラミツクの焼結温度以下の融点と
することにより、陰極構体の補強構造が簡潔化さ
れるなどの極めて優れた効果が得られた。 As explained above, according to the magnetron of the present invention, it is possible to bond between the filament and the end shield and between the end shield and the lead at a lower melting point than the eutectic alloy brazing filler metal of ruthenium and molybdenum. Therefore, the life of the heater used during brazing can be extended. Further, by setting the melting point to be lower than the sintering temperature of alumina ceramic, extremely excellent effects such as simplifying the reinforcement structure of the cathode structure were obtained.
第１図、第２図は従来のマグネトロン陰極構体
の一例を示す要部断面構成図、第３図は本発明に
よるマグネトロンの一例を示す要部断面構成図、
第４図は本発明におけるろう材のニツケル含有量
に対する融点の関係を示す特性図である。
１……フイラメント、２……上部エンドシール
ド、３……下部エンドシールド、４……センター
サポート、５……サイドサポート、６……スペー
サ、９……ろう材。
1 and 2 are cross-sectional configuration diagrams of essential parts showing an example of a conventional magnetron cathode structure, FIG. 3 is a cross-sectional configuration diagram of essential parts showing an example of a magnetron according to the present invention,
FIG. 4 is a characteristic diagram showing the relationship between the melting point and the nickel content of the brazing filler metal in the present invention. 1... Filament, 2... Upper end shield, 3... Lower end shield, 4... Center support, 5... Side support, 6... Spacer, 9... Brazing metal.
Claims (1)
ラメントを保持する高融点金属からなるエンドシ
ールドと、前記エンドシールドに所要の電力を通
電するリードとを備えるマグネトロンにおいて、
フイラメントとエンドシールドとの間の接合およ
びエンドシールドとリードとの間の接合の少なく
とも一方の接合のためのろう材にルテニウムとモ
リブデンとの共晶合金ろうにニツケルを添加した
組成物を用いたことを特徴とするマグネトロン。 ２ 前記ニツケルの添加量を重量％で５〜50％の
範囲としたことを特徴とする特許請求の範囲第１
項記載のマグネトロン。[Scope of Claims] 1. A magnetron comprising a filament that emits thermoelectrons, an end shield made of a high-melting point metal that holds the filament, and a lead that supplies a required power to the end shield,
A composition in which nickel is added to a eutectic alloy of ruthenium and molybdenum is used as a brazing material for at least one of the joining between the filament and the end shield and the joining between the end shield and the lead. A magnetron featuring 2. Claim 1, characterized in that the amount of nickel added is in the range of 5 to 50% by weight.
Magnetron described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8486882A JPS58204436A (en) | 1982-05-21 | 1982-05-21 | Brazing material for electron tube cathode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8486882A JPS58204436A (en) | 1982-05-21 | 1982-05-21 | Brazing material for electron tube cathode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58204436A JPS58204436A (en) | 1983-11-29 |
| JPH0218535B2 true JPH0218535B2 (en) | 1990-04-25 |
Family
ID=13842782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8486882A Granted JPS58204436A (en) | 1982-05-21 | 1982-05-21 | Brazing material for electron tube cathode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58204436A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5861716A (en) * | 1995-02-20 | 1999-01-19 | Hitachi, Ltd. | Magnetron having a cathode mount with a grooved recess for securely receiving a cathode filament |
| DE102007050487A1 (en) | 2007-10-19 | 2009-04-30 | W.C. Heraeus Gmbh | High temperature solder for the production of discharge lamp by a solder connection between a tungsten-based electrode and molybdenum-based supporting bar, comprises molybdenum and ruthenium as main component, and further metals |
-
1982
- 1982-05-21 JP JP8486882A patent/JPS58204436A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58204436A (en) | 1983-11-29 |
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