CN212648179U - Cathode emitter - Google Patents
Cathode emitter Download PDFInfo
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- CN212648179U CN212648179U CN202022096208.1U CN202022096208U CN212648179U CN 212648179 U CN212648179 U CN 212648179U CN 202022096208 U CN202022096208 U CN 202022096208U CN 212648179 U CN212648179 U CN 212648179U
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Abstract
The utility model discloses a cathode emitter, including two at least cathode emitter units. The cathode emitter units are sequentially spliced and connected and fixed on the emitter tray, and the spliced cathode emitter units form a complete cathode emitter. The cathode emitter unit comprises a splicing part and an assembling part, the splicing part of the cathode emitter unit is of an equal-width strip-shaped structure, grooves matched with the assembling part of the cathode emitter unit are formed in the surface of the emitter tray, the axes of the grooves are parallel to each other, the distance between the axes of adjacent grooves is equal to the width of the cathode emitter unit, the cathode emitter unit is fixed on the grooves of the emitter tray through the assembling part, and the splicing parts of the cathode emitter units are sequentially spliced to form a complete cathode emitter. The utility model discloses be a plurality of equal width emitter units with the emitter split, obtain the cathodic emission face of large tracts of land through the mode of concatenation, solved the cracked problem of the lanthanum hexaboride emitter of large tracts of land under high low temperature strikes repeatedly easily.
Description
Technical Field
The utility model relates to a large-scale developments vacuum electronic equipment, concretely relates to structure of cathode emitter.
Background
The cathode is widely applied to devices such as electronic analysis, ion implantation, ion plating, material treatment, nuclear physics science, technical research and the like. In military, the cathode is the heart of various vacuum microwave electronic devices, vacuum low-light night vision devices, vacuum infrared imaging devices and vacuum ultraviolet imaging devices. Meanwhile, in industrial and medical devices, an X-ray tube, an image intensifier, an accelerator tube, and a display, which use a cathode as an emission source, play a very important role. In scientific research, cathodes are also indispensable key components in various analytical instruments, electron beam processing, electron beam exposure, electron beam evaporation and other equipment.
The lanthanum hexaboride cathode has the advantages of large emission current density, strong poisoning resistance and ion bombardment resistance, small material evaporation rate, long service life and the like, is an ideal electron source in the existing various cathodes, and is particularly suitable for large-scale equipment under the working condition of large emission current.
The lanthanum hexaboride cathode has wide application in large accelerators, nuclear physical science and technology research, electron beam heating, electron beam melting, electron beam coating and the like. For a long time, people have made a great deal of research and development work on the research and development of lanthanum hexaboride cathodes used for small emission current, and the research and development work is successfully applied, and good results are obtained. However, in the research and development of a high-current large-emission lanthanum hexaboride cathode which needs to reach tens, hundreds or thousands of amperes, the technical problem is not broken through at present:
the large emission current needs a large emission area, the lanthanum hexaboride material is prepared by adopting a powder metallurgy high-temperature high-pressure preparation process, the lanthanum hexaboride material is conductive ceramic in property, and a large-area lanthanum hexaboride emitter is easy to crack under repeated impact at high and low temperatures; and lanthanum hexaboride emitters can chemically react with refractory metals in contact with them at high temperatures, resulting in damage to the base metal and lanthanum hexaboride cathode.
SUMMERY OF THE UTILITY MODEL
For solving the current little problem of cathode emission current, satisfy the demand of market to big emission current negative pole, the utility model provides a cathode emitter.
The utility model discloses a following technical scheme realizes:
a cathode emitter comprises at least two cathode emitter units, and the number of the cathode emitter units is not more than 10. The cathode emitter units are sequentially spliced and connected and fixed on the emitter tray, the spliced cathode emitter units form a complete cathode emitter, and the diameter or the width of the emitter is not more than 100 mm.
The cathode emitter unit comprises a splicing part and an assembling part, the splicing part of the cathode emitter unit is of an equal-width strip-shaped structure, grooves matched with the assembling part of the cathode emitter unit are formed in the surface of the emitter tray, the axes of the grooves are parallel to each other, the distance between the axes of adjacent grooves is equal to the width of the cathode emitter unit, the cathode emitter unit is fixed on the grooves of the emitter tray through the assembling part, and the splicing parts of the cathode emitter units are sequentially spliced to form a complete cathode emitter.
The cathode emitter unit is made of lanthanum hexaboride, and the emitter tray is made of molybdenum. In order to avoid the chemical reaction between the cathode emitter and the emitter tray in a high-temperature environment, the upper surface of the emitter tray is coated with an isolation layer which does not react with lanthanum hexaboride and molybdenum at a high temperature.
On the basis of the technical scheme, the method further comprises the following steps: the groove formed in the surface of the emitter tray is a dovetail groove.
On the basis of the technical scheme, the method further comprises the following steps: the top view of the cathode emitter is circular, the lengths of the top views of the cathode emitter units are sequentially reduced from the axis to the outer side, the long edges are parallel straight lines, the widths of the long edges are equal, and the wide edges are concentric arcs.
Optionally, the top view of the cathode emitter is rectangular, and the top view of the cathode emitter unit is rectangular with equal length and width.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
1. the utility model discloses be a plurality of equal width emitter units with the emitter split, obtain the cathodic emission face of large tracts of land through the mode of concatenation, solved the cracked problem of the lanthanum hexaboride emitter of large tracts of land under high low temperature strikes repeatedly easily.
2. The utility model discloses a coating the isolation layer on emitter tray upper surface, avoid the emitter of lanthanum hexaboride material and the emitter tray high temperature of metal molybdenum material to take place chemical reaction.
Drawings
A further understanding of the embodiments of the present invention may be obtained by reference to the following claims and the following description of the preferred embodiments of the invention, which are incorporated in and constitute a part of this specification. Individual features of the different embodiments shown in the figures may be combined in any desired manner in this case without going beyond the scope of the invention. In the drawings:
FIG. 1 is a top view of a cathode emitter of example 1;
FIG. 2 is a top view of the projectile of the present invention;
fig. 3 is a top view of a cathode emitter of example 2.
Description of reference numerals: 1-cathode emitter, 2-emitter tray, 15-cathode emitter unit.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Example 1:
as shown in fig. 1, in the present embodiment, a cathode emitter 1 includes 10 cathode emitter units 15, the cathode emitter units 15 are sequentially connected and fixed on an emitter tray 2, and the connected cathode emitter units 15 form a complete cathode emitter 1.
As shown in fig. 2, the cathode emitter unit 15 includes a splicing portion and an assembly portion, the splicing portion of the cathode emitter unit 15 is a strip structure with equal width, the width is 10mm, dovetail grooves matched with the assembly portion of the cathode emitter unit 15 are formed on the surface of the emitter tray 2, the axes of the dovetail grooves are parallel to each other, the distance between the axes of adjacent dovetail grooves is equal to the width of the cathode emitter unit 15, the cathode emitter unit 15 is fixed on the dovetail grooves of the emitter tray 2 through the assembly portion, the splicing portions of the cathode emitter units 15 are sequentially spliced to form a complete cathode emitter 1, and the diameter of the cathode emitter 1 is 100 mm.
The plan view of the cathode emitter 1 is circular, the length of the plan view of the cathode emitter unit 15 decreases from the axis to the outside direction in sequence, the long sides are parallel straight lines, the widths are equal, and the wide sides are concentric arcs with the radius of 50 mm.
It should be noted that the cathode emitter unit 15 is made of lanthanum hexaboride, and the emitter tray 2 is made of molybdenum. In order to avoid the chemical reaction between the cathode emitter 1 and the emitter tray 2 in a high-temperature environment, the upper surface of the emitter tray 2 is coated with a high-temperature-resistant metal isolation layer which is conducted at a high temperature and does not react with lanthanum hexaboride and molybdenum.
Example 2:
in this embodiment, a cathode emitter 1 includes 10 cathode emitter units 15, the cathode emitter units 15 are sequentially connected and fixed on an emitter tray 2, and the connected cathode emitter units 15 form a complete cathode emitter 1.
As shown in fig. 3, the cathode emitter 1 is rectangular in plan view, and the cathode emitter cell 15 is rectangular in plan view, having a length of 100mm and a width of 1.
It should be noted that the cathode emitter unit 15 is made of lanthanum hexaboride, and the emitter tray 2 is made of molybdenum. In order to avoid the chemical reaction between the cathode emitter 1 and the emitter tray 2 in a high-temperature environment, the upper surface of the emitter tray 2 is coated with a high-temperature-resistant metal isolation layer which is conducted at a high temperature and does not react with lanthanum hexaboride and molybdenum.
It should be noted that the emitter diameter can be controlled according to the number of emitter units to reach 40mm, 100mm, 150mm or even 200 mm.
Combine above-mentioned embodiment, can see that the utility model discloses with the emitter split into a plurality of equal width emitter units, obtain the cathodal emission face of large tracts of land through the mode of concatenation, solved the problem that lanthanum hexaboride emitter of large tracts of land is easy cracked under high low temperature strikes repeatedly. By coating the insulating layer on the upper surface of the emitter tray 2, the chemical reaction between the emitter made of lanthanum hexaboride and the emitter tray 2 made of molybdenum metal at high temperature is avoided.
The above-mentioned embodiments further explain in detail the objects, technical solutions and advantages of the present invention, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, and all the equivalent structures or equivalent processes that are used in the specification and drawings of the present invention are changed or directly or indirectly used in other related technical fields, and are all included in the scope of the present invention.
Claims (8)
1. The cathode emitter is characterized by comprising at least two cathode emitter units (15), wherein the cathode emitter units (15) are sequentially spliced, connected and fixed on an emitter tray (2), and the spliced cathode emitter units (15) form a complete cathode emitter (1).
2. The cathode emitter according to claim 1, wherein the cathode emitter unit (15) comprises a splicing part and an assembling part, the splicing part of the cathode emitter unit (15) is of an equal-width strip-shaped structure, grooves matched with the assembling part of the cathode emitter unit (15) are formed in the surface of the emitter tray (2), the axes of the grooves are parallel to each other, the distance between the axes of adjacent grooves is equal to the width of the cathode emitter unit (15), the cathode emitter unit (15) is fixed on the grooves of the emitter tray (2) through the assembling part, and the splicing parts of the cathode emitter units (15) are sequentially spliced to form the complete cathode emitter (1).
3. The cathode emitter as claimed in claim 1, wherein the surface of the emitter tray (2) is provided with grooves in the form of dovetail grooves.
4. The cathode emitter of claim 1, wherein the cathode emitter cell (15) is a lanthanum hexaboride material.
5. The cathode emitter as claimed in claim 4, characterised in that the upper surface of the emitter tray (2) is coated with a barrier layer.
6. The cathode emitter as claimed in claim 1, characterised in that the emitter tray (2) is of molybdenum metal.
7. The cathode emitter according to claim 1, wherein the cathode emitter (1) is circular in plan view, the length of the cathode emitter unit (15) in plan view decreases from the axis to the outside, the long sides are parallel straight lines, the width is equal, and the wide sides are concentric arcs.
8. The cathode emitter according to claim 1, wherein the cathode emitter (1) is rectangular in plan view, and the cathode emitter cells (15) are rectangular in plan view with equal length and width.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022096208.1U CN212648179U (en) | 2020-09-22 | 2020-09-22 | Cathode emitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022096208.1U CN212648179U (en) | 2020-09-22 | 2020-09-22 | Cathode emitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212648179U true CN212648179U (en) | 2021-03-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022096208.1U Active CN212648179U (en) | 2020-09-22 | 2020-09-22 | Cathode emitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212648179U (en) |
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2020
- 2020-09-22 CN CN202022096208.1U patent/CN212648179U/en active Active
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