CN102637566B - Barium-tungsten cathode with high current density and preparation method thereof - Google Patents
Barium-tungsten cathode with high current density and preparation method thereof Download PDFInfo
- Publication number
- CN102637566B CN102637566B CN201210090817.3A CN201210090817A CN102637566B CN 102637566 B CN102637566 B CN 102637566B CN 201210090817 A CN201210090817 A CN 201210090817A CN 102637566 B CN102637566 B CN 102637566B
- Authority
- CN
- China
- Prior art keywords
- tungsten
- powder
- cathode
- barium
- current density
- 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.)
- Active
Links
Landscapes
- Powder Metallurgy (AREA)
- Solid Thermionic Cathode (AREA)
Abstract
The invention discloses a barium-tungsten cathode with high current density and a preparation method thereof, wherein the barium-tungsten cathode comprises a cathode molybdenum cylinder (3) and a double-layer substrate filled in the cathode molybdenum cylinder (3), the double-layer substrate comprises an upper layer and a lower layer, the upper layer is a spherical tungsten powder layer (1) formed by pressing spherical tungsten powder serving as a substrate material, and the particle size of the tungsten powder is 4 mu m; the lower layer is a tungsten-rhenium alloy layer (2) formed by pressing tungsten powder and rhenium powder which are mixed as a base material, and the tungsten powder and the rhenium powder are uniformly mixed according to the proportion of 20 percent to 80 percent. The barium-tungsten cathode with the special structure and the large current density adopts a double-layer substrate, the upper layer is formed by pressing tungsten powder with specific particles in a specific shape as a substrate material, and the lower layer is formed by pressing tungsten powder and rhenium powder which are mixed as the substrate material, so that the current density of 100A/cm2 can be stably provided, the requirements of high-power and high-frequency microwave devices on the cathode are met, and the strong guarantee is provided for the development of the microwave devices.
Description
Technical field
The present invention relates to a kind of barium-tungsten dispense cathode, especially relate to barium-tungsten dispense cathode of a kind of high current density and preparation method thereof.
Background technology
Development along with the epoch, the progress of science, microwave device more and more strides forward towards high-power, high-frequency direction, this is a huge test to the negative electrode as microwave device electron source, especially enter after millimere-wave band, terahertz wave band, very large to the current density requirements of electron beam, need the stable current density that every square centimeter of dozens or even hundreds of ampere is provided of negative electrode energy.Traditional barium-tungsten dispense cathode is because the blind hole of negative electrode cavernous body is more, pore structure is inhomogeneous, the deposit of cathode active material is abundant not, barium content in cathode active material is low, and cathode active material reacts too fast with traditional pure tungsten cathode substrate, and a large amount of active materials have evaporated very soon, negative electrode not only emission current is less than normal, drawing under the state of large electric current, can't lasting stability work, be difficult to meet that microwave device is high-power, the needs of high-frequency development.
Summary of the invention
Technical problem to be solved by this invention is barium-tungsten dispense cathode providing for problems of the prior art a kind of high current density and preparation method thereof, its objective is and makes current density can reach 100A/cm
2, meet the needs that microwave device is high-power, high-frequency develops.
Technical scheme of the present invention is that the barium-tungsten dispense cathode of this kind of high current density comprises negative electrode molybdenum cylinder and is filled in the double base in negative electrode molybdenum cylinder, described double base comprises the upper and lower, upper strata is the tungsten powder globular tungsten powder layer that compacting forms as base material that adopts ball shape, and lower floor adopts tungsten powder to mix the tungsten-rhenium alloy layer that compacting forms as base material with rhenium powder.
The particle diameter of described upper strata globular tungsten powder is 2 μ m～10 μ m, is preferably 4 μ m.
Tungsten powder and rhenium powder in described tungsten-rhenium alloy layer mix according to the ratio of 10%～50%:90%～50%, and the proportion optimization of tungsten powder and rhenium powder is 20%:80%.
A kind of method for the preparation of above-mentioned barium-tungsten dispense cathode comprises:
1) get tungsten powder and rhenium powder arbitrary shape, that granularity is less than 50 μ m and in hydrogen, purify annealing, in 800 ℃～950 ℃ environment, be incubated 20min～30min;
2) tungsten powder and rhenium powder after purifying are mixed according to the ratio of 10%～50%:90%～50%, preferred proportion is 20%:80%, prepares tungsten-rhenium alloy powder;
3) get the globular tungsten powder of particle diameter 2 μ m～10 μ m, similar ball shape, in hydrogen, purify annealing, in 800 ℃～950 ℃ environment, be incubated 20min～30min, the preferable particle size 4 μ m of globular tungsten powder;
4) take appropriate globular tungsten powder, be filled in negative electrode molybdenum cylinder, and make powder plain;
5) take again appropriate W-Re mixed powder, be filled in step 4) after negative electrode molybdenum cylinder in, and make powder plain;
6) use 8～15T/cm
2pressure target suppress, the cell size of cathode substrate is controlled to 28%～40%, be preferably controlled at 33%～35%;
7) in hydrogen, the negative electrode after compacting is carried out to sintering, in 1400 ℃～1600 ℃ environment, be incubated 30～70min;
8) adopt 3.5BaCO
30.5CaCO
3the aluminate of 2Al floods the negative electrode after sintering in lower than the dry hydrogen of-60 ℃ at dew point, impregnation technology is in the time of 1250 ℃～1300 ℃, to be incubated 7min～12min, then within 2min, rise to 1740 ℃～1780 ℃, insulation 30s～70s, subsequently cooling;
9) remove the unnecessary cathode salt of cathode surface, and carry out machining according to figure paper size;
10) use nitrogen as medium, ion etching cleaning is carried out on target surface, makes cathode emission surface expose fresh perforate.
The barium-tungsten dispense cathode with this kind of high current density of above-mentioned special construction adopts double base, upper strata adopts the tungsten powder of the specific particle of given shape to suppress and form as base material, lower floor adopts tungsten powder to mix the compacting as base material with rhenium powder and forms, and 100A/cm can be stably provided
2current density, meet high-power, the anticathode demand of High power microwavs device, for the development of microwave device provides strong guarantee.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 is the structural representation of barium-tungsten dispense cathode in the present invention.
In Fig. 1,1: globular tungsten powder layer; 2: tungsten-rhenium alloy layer; 3: negative electrode molybdenum cylinder.
Embodiment
Figure 1 shows that the structural representation of barium-tungsten dispense cathode in the present invention, the barium-tungsten dispense cathode of this kind of high current density comprises negative electrode molybdenum cylinder 3 and is filled in the double base in negative electrode molybdenum cylinder 3, double base comprises the upper and lower, upper strata is the tungsten powder globular tungsten powder layer 1 that compacting forms as base material that adopts ball shape, and lower floor adopts tungsten powder to mix the tungsten-rhenium alloy layer 2 that compacting forms as base material with rhenium powder.
The particle diameter of the globular tungsten powder of upper strata globular tungsten powder layer 1 is 2 μ m～10 μ m, is preferably 4 μ m; Tungsten powder and rhenium powder in lower floor's tungsten-rhenium alloy layer 2 mix according to the ratio of 10%～50%:90%～50%, and proportion optimization is 20%:80%.
A kind of method of the barium-tungsten dispense cathode for the preparation of high current density comprises:
1) get tungsten powder and rhenium powder arbitrary shape, that granularity is less than 50 μ m and in hydrogen, purify annealing, in 800 ℃～950 ℃ environment, be incubated 20min～30min;
2) tungsten powder and rhenium powder after purifying are mixed according to the ratio of 10%～50%:90%～50%, prepare tungsten-rhenium alloy powder; The proportion optimization of tungsten powder and rhenium powder is 20%:80%.
3) get the globular tungsten powder of particle diameter 2 μ m～10 μ m, similar ball shape, purify annealing in hydrogen, in 800 ℃～950 ℃ environment, be incubated 20min～30min, the particle diameter of globular tungsten powder is preferably 4 μ m;
4) take appropriate globular tungsten powder, be filled in negative electrode molybdenum cylinder 3, and make powder plain;
5) take again appropriate W-Re mixed powder, be filled in step 4) after negative electrode molybdenum cylinder 3 in, and make powder plain;
6) use the pressure target of 8～15T/cm2 to suppress, the cell size of cathode substrate is controlled to 28%～40%, be preferably controlled at 33%～35%;
7) in hydrogen, the negative electrode after compacting is carried out to sintering, in 1400 ℃～1600 ℃ environment, be incubated 30～70min;
8) adopt 3.5BaCO
30.5CaCO
3the aluminate of 2Al floods the negative electrode after sintering in lower than the dry hydrogen of-60 ℃ at dew point, impregnation technology is in the time of 1250 ℃～1300 ℃, to be incubated 7min～12min, then within 2min, rise to 1740 ℃～1780 ℃, insulation 30s～70s, subsequently cooling;
9) remove the unnecessary cathode salt of cathode surface, and carry out machining according to figure paper size;
10) use nitrogen as medium, ion etching cleaning is carried out on target surface, makes cathode emission surface expose fresh perforate.
The barium-tungsten dispense cathode of this kind of high current density adopts double base, and upper strata adopts the tungsten powder of the specific particle of given shape to suppress and form as base material, and lower floor adopts tungsten powder to mix the compacting as base material with rhenium powder and forms, and 100A/cm can be stably provided
2current density, meet high-power, the anticathode demand of High power microwavs device, for the development of microwave device provides strong guarantee.
Claims (6)
1. the barium-tungsten dispense cathode of a high current density, it is characterized in that: described barium-tungsten dispense cathode comprises negative electrode molybdenum cylinder (3) and is filled in the double base in negative electrode molybdenum cylinder (3), described double base comprises the upper and lower, upper strata is the tungsten powder globular tungsten powder layer (1) that compacting forms as base material that adopts ball shape, and lower floor adopts tungsten powder to mix the tungsten-rhenium alloy layer (2) that compacting forms as base material with rhenium powder;
The preparation method of the barium-tungsten dispense cathode of described high current density comprises:
1) get tungsten powder and rhenium powder arbitrary shape, that granularity is less than 50 μ m and in hydrogen, purify annealing, in 800 ℃～950 ℃ environment, be incubated 20min～30min;
2) tungsten powder and rhenium powder after purifying are mixed according to the ratio of 10%～50%:90%～50%, prepare tungsten-rhenium alloy powder;
3) get the globular tungsten powder of particle diameter 2 μ m～10 μ m, similar ball shape, in hydrogen, purify annealing, in 800 ℃～950 ℃ environment, be incubated 20min～30min;
4) take appropriate globular tungsten powder, be filled in negative electrode molybdenum cylinder (3), and make powder plain;
5) take again appropriate W-Re mixed powder, be filled in step 4) after negative electrode molybdenum cylinder (3) in, and make powder plain;
6) use 8～15T/cm
2pressure target suppress, the cell size of cathode substrate is controlled to 28%～40%;
7) in hydrogen, the negative electrode after compacting is carried out to sintering, in 1400 ℃～1600 ℃ environment, be incubated 30～70min;
8) adopt 3.5BaCO
30.5CaCO
3the aluminate of 2Al floods the negative electrode after sintering in lower than the dry hydrogen of-60 ℃ at dew point, impregnation technology is in the time of 1250 ℃～1300 ℃, to be incubated 7min～12min, then within 2min, rise to 1740 ℃～1780 ℃, insulation 30s～70s, subsequently cooling;
9) remove the unnecessary cathode salt of cathode surface, and carry out machining according to figure paper size;
10) use nitrogen as medium, ion etching cleaning is carried out on target surface, makes cathode emission surface expose fresh perforate.
2. the barium-tungsten dispense cathode of a kind of high current density according to claim 1, is characterized in that: the particle diameter of described upper strata globular tungsten powder is 2 μ m～10 μ m.
3. the barium-tungsten dispense cathode of a kind of high current density according to claim 1 and 2, is characterized in that: tungsten powder and rhenium powder in described tungsten-rhenium alloy layer (2) mix according to the ratio of 10%～50%:90%～50%.
4. the barium-tungsten dispense cathode of a kind of high current density according to claim 2, is characterized in that: the particle diameter of described upper strata globular tungsten powder is preferably 4 μ m.
5. the barium-tungsten dispense cathode of a kind of high current density according to claim 3, is characterized in that: the tungsten powder in described tungsten-rhenium alloy layer (2) and the proportion optimization of rhenium powder are 20%:80%.
6. the barium-tungsten dispense cathode of a kind of high current density according to claim 1, is characterized in that: the cell size of described cathode substrate is preferably controlled at 33%～35%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210090817.3A CN102637566B (en) | 2012-03-30 | 2012-03-30 | Barium-tungsten cathode with high current density and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210090817.3A CN102637566B (en) | 2012-03-30 | 2012-03-30 | Barium-tungsten cathode with high current density and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102637566A CN102637566A (en) | 2012-08-15 |
| CN102637566B true CN102637566B (en) | 2014-11-19 |
Family
ID=46621921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210090817.3A Active CN102637566B (en) | 2012-03-30 | 2012-03-30 | Barium-tungsten cathode with high current density and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102637566B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105185675A (en) * | 2015-07-28 | 2015-12-23 | 安徽华东光电技术研究所 | Multi-injection cathode used for ultra-high-power microwave tube, and preparation method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485269A (en) * | 2014-11-11 | 2015-04-01 | 安徽华东光电技术研究所 | Multi-beam cathode rhenium powder treatment method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101145490A (en) * | 2007-08-03 | 2008-03-19 | 安徽华东光电技术研究所 | TWT impregnated Ba-W cathode and its preparation method |
| CN102024640A (en) * | 2009-09-09 | 2011-04-20 | 中国科学院电子学研究所 | Method for preparing impregnated cathode matrix |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0777115B2 (en) * | 1985-05-20 | 1995-08-16 | 株式会社日立製作所 | Impregnated cathode |
| GB2188771B (en) * | 1986-04-01 | 1990-12-19 | Ceradyne Inc | Dispenser cathode and method of manufacture therefor |
-
2012
- 2012-03-30 CN CN201210090817.3A patent/CN102637566B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101145490A (en) * | 2007-08-03 | 2008-03-19 | 安徽华东光电技术研究所 | TWT impregnated Ba-W cathode and its preparation method |
| CN102024640A (en) * | 2009-09-09 | 2011-04-20 | 中国科学院电子学研究所 | Method for preparing impregnated cathode matrix |
Non-Patent Citations (4)
| Title |
|---|
| JP昭61-264625A 1986.11.22 * |
| JP昭62-237634A 1987.10.17 * |
| 张红卫等.新型二元混合基钡钨阴极的发射性能研究.《电子器件》.2006,第29卷(第2期), * |
| 新型二元混合基钡钨阴极的发射性能研究;张红卫等;《电子器件》;20060630;第29卷(第2期);308-310 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105185675A (en) * | 2015-07-28 | 2015-12-23 | 安徽华东光电技术研究所 | Multi-injection cathode used for ultra-high-power microwave tube, and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102637566A (en) | 2012-08-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Li et al. | A synergistic strategy for stable lithium metal anodes using 3D fluorine-doped graphene shuttle-implanted porous carbon networks | |
| Li et al. | Assembling a double shell on a diatomite skeleton ternary complex with conductive polypyrrole for the enhancement of supercapacitors | |
| Li et al. | Sulphur-doped reduced graphene oxide sponges as high-performance free-standing anodes for K-ion storage | |
| Wang et al. | Structural and chemical synergistic encapsulation of polysulfides enables ultralong-life lithium–sulfur batteries | |
| Ngo et al. | Mass-scalable synthesis of 3D porous germanium–carbon composite particles as an ultra-high rate anode for lithium ion batteries | |
| Ji et al. | Flexible electrocatalytic nanofiber membrane reactor for lithium/sulfur conversion chemistry | |
| KR102346840B1 (en) | Porous Carbon, Positive Electrode Comprising the Same and Lithium-sulfur Battery Comprising the Same | |
| Lyu et al. | Supramolecular hydrogel directed self-assembly of C-and N-doped hollow CuO as high-performance anode materials for Li-ion batteries | |
| WO2012116156A3 (en) | Porous structures for energy storage devices | |
| Lei et al. | Iron oxide nanoconfined in carbon nanopores as high capacity anode for rechargeable alkaline batteries | |
| Xu et al. | Achieving ultralong‐cycle zinc‐ion battery via synergistically electronic and structural regulation of a MnO2 nanocrystal–carbon hybrid framework | |
| CN105826523A (en) | Lithium-sulfur battery positive pole material and preparation method thereof | |
| CN104393304A (en) | Lithium-selenium battery positive electrode material, preparation method thereof and lithium-selenium battery | |
| Ying et al. | 3D hierarchical CuS microflowers constructed on copper powders-filled nickel foam as advanced binder-free electrodes | |
| CN103390752A (en) | Graphene-based composite material, preparation method of same and application of same in lithium-sulfur battery | |
| CN109659546B (en) | Sulfur/nitrogen/silicon co-doped graphite composite negative electrode material and preparation method thereof | |
| CN108807006A (en) | A kind of preparation method of carbon-based flexible electrode | |
| CN102157736A (en) | Ferrous disulfide/carbon composite cathode material of primary lithium battery and preparation method and application thereof | |
| Xue et al. | Template-directed fabrication of porous gas diffusion layer for magnesium air batteries | |
| CN106159277A (en) | Porous current collector and preparation method thereof | |
| CN102637566B (en) | Barium-tungsten cathode with high current density and preparation method thereof | |
| Cai et al. | In situ exsolution of metallic Cu in mixed oxides as battery-type electrode for energy storage devices | |
| JP2016115417A (en) | Positive electrode used for lithium sulfur secondary battery, and lithium sulfur secondary battery | |
| Wang et al. | In situ synthesis of tin dioxide submicrorods anchored on nickel foam as an additive-free anode for high performance sodium-ion batteries | |
| CN106505182A (en) | A kind of carbon-sulfur complex with microcapsule structure and its preparation and application |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 241000 No.01 Eshan Road, high tech Development Zone, Yijiang District, Wuhu City, Anhui Province Patentee after: ANHUI HUADONG PHOTOELECTRIC TECHNOLOGY INSTITUTE Co.,Ltd. Address before: 241000 Anhui Province, Wuhu city Yijiang District South high tech Development Zone Technology Park mansion Patentee before: Anhui Huadong Polytechnic Institute |