CN106128903A - A kind of novel cathode molybdenum barrel structure and manufacture method thereof - Google Patents
A kind of novel cathode molybdenum barrel structure and manufacture method thereof Download PDFInfo
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- CN106128903A CN106128903A CN201610765044.2A CN201610765044A CN106128903A CN 106128903 A CN106128903 A CN 106128903A CN 201610765044 A CN201610765044 A CN 201610765044A CN 106128903 A CN106128903 A CN 106128903A
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- molybdenum
- round platform
- heater
- platform hole
- bottom outlet
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- 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
- H01J1/14—Solid thermionic cathodes characterised by the material
- H01J1/146—Solid thermionic cathodes characterised by the material with metals or alloys as an emissive material
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- 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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Solid Thermionic Cathode (AREA)
Abstract
The present invention relates to a kind of novel cathode molybdenum barrel structure and manufacture method thereof, belong to negative electrode manufacturing technology field in electron tube.The top of molybdenum cylinder body offers a stepped hole, and the bottom of molybdenum cylinder body offers a bottom outlet, offers the round platform hole of equidistantly arrangement in bottom outlet；The present invention realizes being welded on stepped hole tungsten basal body, heater and insulation powder are sintered in the round platform hole equidistantly arranged, heater assembly and emission of cathode matrix is made to become an overall structure, heater assembly and emission of cathode matrix distance only 0.1mm 0.2mm, it is greatly improved the heat utilization efficiency of heater assembly, reduce the temperature difference between heater assembly and cathode base, extend the heater life-span, negative electrode can be made to reach rapid hot start simultaneously；It is designed to down zigzag for sintering the round platform hole of the equidistantly arrangement of heater, can firmly be attached on the sidewall of round platform hole after insulating powder sintering fusing, greatly avoid heater insulating barrier obscission, and then substantially increase the reliability of cathode assembly.
Description
Technical field
The present invention relates to a kind of novel cathode molybdenum barrel structure and manufacture method thereof, belong to negative electrode in electron tube and manufacture skill
Art field.
Background technology
In modern high power microwave device, barium-tungsten dispense cathode is widely used, and launches electronics as electron source, is microwave device
" heart " of part.Barium-tungsten dispense cathode structure great majority use cathodes heated indirectly by an el, and common preparation method is first to be suppressed by tungsten powder
In molybdenum cylinder, form matrix, in matrix, impregnate aluminic acid barium salt the most at high operating temperatures, afterwards by machining process car
Cut the surface of emission, by sputtering film coating method, emission of cathode face is performed etching plated film followed by, heater is finally installed in molybdenum cylinder
I.e. complete to make after assembly and assembly welding auxiliary heat shielding.This indirected heated cathode structure does not has shape due to heater assembly and negative electrode
Into a single integrated structure, there is heater assembly Btu utilization low, the temperature difference between heater assembly and negative electrode is bigger than normal, reaches 200 DEG C
～300 DEG C more than, therefore cause the waste of heater heat, reduce the thermal efficiency, add again the risk that heater burns, negative electrode simultaneously
Less reliable.
Summary of the invention
The technical problem to be solved is the defect overcoming prior art, it is provided that a kind of novel cathode molybdenum barrel structure
And manufacture method, this structure is passed through technological improvement, can be welded to by tungsten basal body on molybdenum cylinder body, simultaneously by heater and insulating powder
Material is sintered in negative electrode molybdenum cylinder so that heater assembly and emission of cathode matrix become an overall structure, so can significantly carry
The heat utilization efficiency of high heater assembly, reduces the temperature difference between heater assembly and cathode base, extends the heater life-span, can make the moon simultaneously
Pole reaches rapid hot start.
For reaching above-mentioned purpose, the present invention provides a kind of novel cathode molybdenum barrel structure, including molybdenum cylinder body；Described molybdenum cylinder is originally
Body is cylinder, a diameter of D1 of described molybdenum cylinder body, a height of H1 of described molybdenum cylinder body；
The top outer wall of described molybdenum cylinder body along the circumferential direction offers one with the axis of described molybdenum cylinder body for axle center
Cannelure, the interior diameter of described cannelure is D3, D3 ＜ D1, offers a stepped hole in described cannelure, described stepped hole
Interior diameter is D4, D4 ＜ D3, and the degree of depth of described stepped hole is h2；
On the diapire of described molybdenum cylinder body, the axis with described molybdenum cylinder body offers a bottom outlet for axle center, and described bottom outlet is circle
Cylinder, a diameter of D2, the D2 ＜ D1 of described bottom outlet, described bottom outlet height is h1, H1 ＞ h1+h2；Edge, top at described bottom outlet
Direction, described bottom outlet sidewall place offers the round platform hole of N number of equidistant arrangement, N ＞ 1, and the height in described round platform hole is h4, institute
State a diameter of D6 of upper bottom surface, the D6 ＜ D1 in round platform hole, a diameter of D5 of bottom surface, the D6 ＜ D5 ＜ D1 in described round platform hole, described circle
The sidewall in platform hole and diapire angle are A, N × h4 ＜ h1；Described tungsten basal body is arranged in described stepped hole, and described heater is arranged on
In described round platform hole, described insulating barrier is arranged between described heater and described round platform hole.
Preferentially, H1-h1-h2 is in the range of 0.1mm-0.2mm.
Preferentially, D1=4.2-0.02mm, D2=3.8mm, D3=3.5-0.05mm, D4=3+0.02mm, H1=5mm, h1=
4.4mm, h2=0.4mm, h4=0.4mm, N=9.
Preferentially, A scope is 7 °-10 °, D6=D2=3.8mm.
Preferentially, the material of described molybdenum cylinder body is molybdenum.
A kind of novel cathode molybdenum barrel structure manufacture method based on a kind of novel cathode molybdenum barrel structure, comprises the following steps:
Step one: molybdenum bar raw material is put in the hydrogen furnace of vacuum and make annealing treatment, annealing temperature 950 DEG C～1000 DEG C,
Insulation 20min～30min；
Step 2: the molybdenum bar after step one processes is carried out turnery processing, the upper surface of first turning molybdenum bar and lower surface, makes molybdenum
The a length of H1 of rod；
The lateral wall of turning molybdenum bar, the profile making molybdenum bar is cylinder, a diameter of D1 of described molybdenum bar-0.02；
Then at cannelure described in the top turning of molybdenum bar and described stepped hole, the interior diameter of described cannelure is D3-0.05, institute
State a diameter of D4 of stepped hole+0.02, the degree of depth of described cannelure and described stepped hole is h2；
Bottom outlet described in turning on the bottom surface of molybdenum bar, described bottom outlet is cylinder, a diameter of D2 of described bottom outlet, described bottom outlet
It is highly h1；
On the top of described bottom outlet along the N number of described round platform hole of described bottom outlet sidewall place direction turning, the upper end in described round platform hole
The a diameter of D6 in face, a diameter of D5 of bottom surface in described round platform hole, the sidewall slope angle in round platform hole is A, the height in each round platform hole
Degree is h4；
Step 3: cleaning that the molybdenum bar after step 2 processes is deoiled；
Step 4: by the purified treatment in the hydrogen gas atmosphere of the molybdenum bar after step 3 processes, is incubated 900 DEG C, is incubated 3min；
Step 5: tungsten basal body is welded at described stepped hole；
Being placed on by heater in described round platform hole, the length of heater is equal to N × h4, and the sidewall in N number of described round platform hole is respectively provided with
Have insulating powder, then heater and insulating powder sintered, after insulating powder sintering fusing tightly be attached on the sidewall of round platform hole formed
Insulating barrier, be mutually permanently connected between heater, insulating barrier and molybdenum bar one overall structure of formation.
The beneficial effect that the present invention is reached:
(1) present invention can realize being welded to by tungsten basal body on molybdenum cylinder body, heater and insulation powder is sintered to negative electrode molybdenum simultaneously
In the round platform hole of cylinder so that heater assembly and emission of cathode tungsten basal body become an overall structure, and then are greatly improved heater group
The heat utilization efficiency of part, reduces the temperature difference between heater assembly and cathode base, extends the service life of heater；Make negative electrode simultaneously
Reach rapid hot start, greatly shorten preheating time, improve work efficiency.
(2) equidistantly the round platform hole sidewall of the molybdenum cylinder body interior for sintering heater of arrangement forms sawtooth-shaped steps
Shape, can firmly be attached on the sidewall of round platform hole after insulating powder sintering fusing, largely avoid generation heater insulating barrier and comes off
Phenomenon.
(3) vacuum-sintering temperature is more lower than the temperature that gas shield sinters, and advantageously reduces energy resource consumption, saves into
This.
(4) molybdenum bar annealing is had the advantage that
1. improve or eliminate various tissue defects and residual stress that molybdenum bar is caused in casting, welding process, prevent molybdenum
Rod deformation, cracking；
2. increasing ductility and the toughness of molybdenum bar, softening molybdenum bar to carry out machining；
3. crystal grain thinning, improves tissue to improve the mechanical performance of molybdenum bar；
4. perform tissue for finished heat treatment (quench, be tempered) to prepare.
(5) crystallite dimension, pore size and the grain-boundary shape during sintering process makes the microstructure of insulating barrier and distribution
Change, and then improve the performance of insulating barrier.
Accompanying drawing explanation
Fig. 1 is the structure chart of the present invention.
Fig. 2 is the structure chart in the present invention after sawtooth hole amplification.
Labelling implication in accompanying drawing, S01-stepped hole；S02-bottom outlet；S03-round platform hole.
Detailed description of the invention
The invention will be further described below in conjunction with the accompanying drawings.Following example are only used for clearly illustrating the present invention
Technical scheme, and can not limit the scope of the invention with this.
A kind of novel cathode molybdenum barrel structure, including molybdenum cylinder body；Molybdenum cylinder body is cylinder, molybdenum cylinder body a diameter of
D1, a height of H1 of molybdenum cylinder body；
The top outer wall of molybdenum cylinder body along the circumferential direction offers a cannelure, ring with the axis of molybdenum cylinder body for axle center
The interior diameter of shape groove is D3, D3 ＜ D1, offers a stepped hole S01 in cannelure, and the interior diameter of stepped hole S01 is D4, D4 ＜
D3, the degree of depth of stepped hole S01 is h2, uses for welded cathode tungsten basal body；Described tungsten basal body is arranged in described stepped hole, described
Heater is arranged in described round platform hole, and described insulating barrier is arranged between described heater and described round platform hole
On the diapire of molybdenum cylinder body, axis with molybdenum cylinder body offers a bottom outlet S02, bottom outlet S02 for axle center is cylinder,
A diameter of D2, the D2 ＜ D1, bottom outlet S02 of bottom outlet S02 are highly h1, H1 ＞ h1+h2, are used for assembling heater and filling insulating powder
With；Round platform hole S03, the N ＞ 1 of N number of equidistant arrangement is offered along direction, bottom outlet S02 sidewall place, circle on the top of bottom outlet S02
The height of platform hole S03 is h4, a diameter of D5 of bottom surface of a diameter of D6 of upper bottom surface, the D6 ＜ D1, round platform hole S03 of round platform hole S03,
D6 ＜ D5 ＜ D1, the sidewall of round platform hole S03 and diapire angle are A, N × h4 ＜ h1, the round platform hole S03's of N number of equidistant arrangement
Sidewall is arranged in zigzag fashion so that insulating powder sintering fusing after formed insulating barrier tightly adhere to round platform hole S03 sidewall,
Insulating barrier is avoided to come off.
H1-h1-h2 is in the range of 0.1mm-0.2mm, it is ensured that heat quickly can be conducted to tungstenio by heater assembly
Body.
D1=4.2-0.02mm, D2=3.8mm, D3=3.5-0.05mm, D4=3+0.02mm, H1=5mm, h1=4.4mm, h2=
0.4mm, h4=0.4mm, N=9.
A scope is 7 °-10 °, D6=D2=3.8mm.
The material of molybdenum cylinder body is molybdenum.
A kind of novel cathode molybdenum barrel structure manufacture method based on a kind of novel cathode molybdenum barrel structure, comprises the following steps:
Step one: molybdenum bar raw material is put in the hydrogen furnace of vacuum and make annealing treatment, annealing temperature 950 DEG C～1000 DEG C,
Insulation 20min～30min；
Step 2: the molybdenum bar after step one processes is carried out turnery processing, the upper surface of first turning molybdenum bar and lower surface, makes molybdenum
The a length of H1 of rod；
The lateral wall of turning molybdenum bar, the profile making molybdenum bar is cylinder, a diameter of D1 of molybdenum bar-0.02；
Then at top turning cannelure and the stepped hole S01 of molybdenum bar, the interior diameter of cannelure is D3-0.05, stepped hole S01's
A diameter of D4+0.02, the degree of depth of cannelure and stepped hole S01 is h2；
On the bottom surface of molybdenum bar, turning bottom outlet S02, bottom outlet S02 are cylinder, a diameter of D2 of bottom outlet S02, the height of bottom outlet S02
For h1；
On the top of bottom outlet S02 along bottom outlet S02 sidewall place direction turning N number of round platform hole S03, the upper bottom surface of round platform hole S03 is straight
Footpath is D6, a diameter of D5 of bottom surface of round platform hole S03, and the sidewall slope angle of round platform hole S03 is A, the height of each round platform hole S03
Degree is h4；
Step 3: cleaning that the molybdenum bar after step 2 processes is deoiled；
Step 4: by the purified treatment in the hydrogen gas atmosphere of the molybdenum bar after step 3 processes, is incubated 900 DEG C, is incubated 3min；
Step 5: tungsten basal body is welded at stepped hole S01；
Being placed on by heater in the S03 of round platform hole, the length of heater is equal to N × h4, and the sidewall of N number of round platform hole S03 is provided with
Insulating powder, then sinters heater and insulating powder, after insulating powder sintering fusing tightly be attached on the S03 sidewall of round platform hole formed
Insulating barrier, be mutually permanently connected between heater, insulating barrier and molybdenum bar one overall structure of formation.
Vacuum-sintering temperature is more lower than the temperature that gas shield sinters, and advantageously reduces energy resource consumption, cost-effective.
Annealing, after being primarily referred to as material is exposed to one period of some time of high temperature, at the heat the most slowly cooled down
Reason processing procedure.Have the advantage that
1. improve or eliminate various tissue defects and residual stress that molybdenum bar is caused in casting, welding process, prevent molybdenum
Rod deformation, cracking；
2. increasing ductility and the toughness of molybdenum bar, softening molybdenum bar to carry out machining；
3. crystal grain thinning, improves tissue to improve the mechanical performance of molybdenum bar；
4. perform tissue for finished heat treatment (quench, be tempered) to prepare.
Sintering is to be DB insulating powder mass transfer.In general, powder body, after overmolding, is obtained by sintering
DB is a kind of polycrystalline material, and its microstructure is made up of crystal, vitreous body and pore.Sintering process makes the aobvious of insulating barrier
Crystallite dimension, pore size and grain-boundary shape and distribution in micro structure change, and then improve the performance of insulating barrier.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For Yuan, on the premise of without departing from the technology of the present invention principle, it is also possible to make some improvement and deformation, these improve and deformation
Also should be regarded as protection scope of the present invention.
Claims (6)
1. a novel cathode molybdenum barrel structure, it is characterised in that include molybdenum cylinder body, tungsten basal body, heater and insulating barrier；Described molybdenum
Cylinder body is cylinder, a diameter of D1 of described molybdenum cylinder body, a height of H1 of described molybdenum cylinder body；
The top outer wall of described molybdenum cylinder body along the circumferential direction offers one with the axis of described molybdenum cylinder body for axle center
Cannelure, the interior diameter of described cannelure is D3, D3 ＜ D1, offers a stepped hole in described cannelure, described stepped hole
Interior diameter is D4, D4 ＜ D3, and the degree of depth of described stepped hole is h2；
On the diapire of described molybdenum cylinder body, the axis with described molybdenum cylinder body offers a bottom outlet for axle center, and described bottom outlet is circle
Cylinder, a diameter of D2, the D2 ＜ D1 of described bottom outlet, described bottom outlet height is h1, H1 ＞ h1+h2；Edge, top at described bottom outlet
Direction, described bottom outlet sidewall place offers the round platform hole of N number of equidistant arrangement, N ＞ 1, and the height in described round platform hole is h4, institute
State a diameter of D6 of upper bottom surface, the D6 ＜ D1 in round platform hole, a diameter of D5 of bottom surface, the D6 ＜ D5 ＜ D1 in described round platform hole, described circle
The sidewall in platform hole and diapire angle are A, N × h4 ＜ h1；
Described tungsten basal body is arranged in described stepped hole, and described heater is arranged in described round platform hole, and described insulating barrier is arranged on
Between described heater and described round platform hole.
A kind of novel cathode molybdenum barrel structure the most according to claim 1, it is characterised in that H1-h1-h2 in the range of
0.1mm-0.2mm。
A kind of novel cathode molybdenum barrel structure the most according to claim 1, it is characterised in that D1=4.2-0.02Mm, D2=
3.8mm, D3=3.5-0.05Mm, D4=3+0.02Mm, H1=5mm, h1=4.4mm, h2=0.4mm, h4=0.4mm, N=9.
4. according to the arbitrary described a kind of novel cathode molybdenum barrel structure of claim 1 and 3, it is characterised in that A scope is 7 °-
10 °, D6=D2=3.8mm.
A kind of novel cathode molybdenum barrel structure the most according to claim 1, it is characterised in that the material of described molybdenum cylinder body is
Molybdenum.
6. a kind of novel cathode molybdenum barrel structure manufacture method based on claim 1, it is characterised in that comprise the following steps:
Step one: molybdenum bar raw material is put in the hydrogen furnace of vacuum and make annealing treatment, annealing temperature 950 DEG C～1000 DEG C,
Insulation 20min～30min；
Step 2: the molybdenum bar after step one processes is carried out turnery processing, the upper surface of first turning molybdenum bar and lower surface, makes molybdenum
The a length of H1 of rod；
The lateral wall of turning molybdenum bar, the profile making molybdenum bar is cylinder, a diameter of D1 of described molybdenum bar-0.02；
Then at cannelure described in the top turning of molybdenum bar and described stepped hole, the interior diameter of described cannelure is D3-0.05, described
A diameter of D4 of stepped hole+0.02, the degree of depth of described cannelure and described stepped hole is h2；
Bottom outlet described in turning on the bottom surface of molybdenum bar, described bottom outlet is cylinder, a diameter of D2 of described bottom outlet, described bottom outlet
It is highly h1,0.1mm ＜ H1-h1-h2 ＜ 0.2mm；
On the top of described bottom outlet along the N number of described round platform hole of described bottom outlet sidewall place direction turning, the upper end in described round platform hole
The a diameter of D6 in face, a diameter of D5 of bottom surface in described round platform hole, the sidewall slope angle in round platform hole is A, the height in each round platform hole
Degree is h4；
Step 3: cleaning that the molybdenum bar after step 2 processes is deoiled；
Step 4: by the purified treatment in the hydrogen gas atmosphere of the molybdenum bar after step 3 processes, is incubated 900 DEG C, is incubated 3min；
Step 5: tungsten basal body is welded at described stepped hole；
Being placed on by heater in described round platform hole, the length of heater is equal to N × h4, and the sidewall in N number of described round platform hole is respectively provided with
Have insulating powder, then heater and insulating powder sintered, after insulating powder sintering fusing tightly be attached on the sidewall of round platform hole formed
Insulating barrier, be mutually permanently connected between heater, insulating barrier and molybdenum bar one overall structure of formation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610765044.2A CN106128903A (en) | 2016-08-31 | 2016-08-31 | A kind of novel cathode molybdenum barrel structure and manufacture method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610765044.2A CN106128903A (en) | 2016-08-31 | 2016-08-31 | A kind of novel cathode molybdenum barrel structure and manufacture method thereof |
Publications (1)
| Publication Number | Publication Date |
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| CN106128903A true CN106128903A (en) | 2016-11-16 |
Family
ID=57273134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610765044.2A Pending CN106128903A (en) | 2016-08-31 | 2016-08-31 | A kind of novel cathode molybdenum barrel structure and manufacture method thereof |
Country Status (1)
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4912362A (en) * | 1987-10-09 | 1990-03-27 | Thomson-Csf | Sturdy oxide cathode for cathode ray tube |
| CN1700387A (en) * | 2004-05-20 | 2005-11-23 | 中国科学院电子学研究所 | Film-coated cathode-thermistor assembly |
| CN102832090A (en) * | 2012-08-29 | 2012-12-19 | 安徽华东光电技术研究所 | Heater assembly for space traveling wave tube and preparation method thereof |
-
2016
- 2016-08-31 CN CN201610765044.2A patent/CN106128903A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4912362A (en) * | 1987-10-09 | 1990-03-27 | Thomson-Csf | Sturdy oxide cathode for cathode ray tube |
| CN1700387A (en) * | 2004-05-20 | 2005-11-23 | 中国科学院电子学研究所 | Film-coated cathode-thermistor assembly |
| CN102832090A (en) * | 2012-08-29 | 2012-12-19 | 安徽华东光电技术研究所 | Heater assembly for space traveling wave tube and preparation method thereof |
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Application publication date: 20161116 |
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