CN106238961A - One is applicable to travelling-wave tube negative electrode brazing solder and preparation method - Google Patents
One is applicable to travelling-wave tube negative electrode brazing solder and preparation method Download PDFInfo
- Publication number
- CN106238961A CN106238961A CN201610704519.7A CN201610704519A CN106238961A CN 106238961 A CN106238961 A CN 106238961A CN 201610704519 A CN201610704519 A CN 201610704519A CN 106238961 A CN106238961 A CN 106238961A
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- CN
- China
- Prior art keywords
- powder
- cobalt
- negative electrode
- tungsten powder
- tungsten
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- 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.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3046—Co as the principal constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
- B23K35/0244—Powders, particles or spheres; Preforms made therefrom
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a kind of preparation method being applicable to travelling-wave tube negative electrode brazing solder, comprise the steps: that tungsten powder is put into hydrogen furnace 850 DEG C～900 DEG C and annealed once by step SS1, be incubated 0.5 1 hours；Cobalt oxide powder is put into hydrogen furnace 800 DEG C～850 DEG C before getting the raw materials ready and is reduced by step SS2, is incubated 15 20 minutes, prepares pure cobalt powder；Tungsten powder heat treated to described step SS1 and described step SS2 and cobalt powder are milled by step SS3, and screen with the screen cloth of 200～600 mesh；Step SS4 is to put into after 22.22:77.78 weighs respectively to carry out mixing in corundum mortar milling according to tungsten powder and the percentage by weight of cobalt powder, and grinding time is 50～60 minutes, until tungsten powder and cobalt powder are thoroughly mixed prepared sample mixture；The sample mixture that step SS5 takes a certain amount of described step SS5 prepared carries out solder melt point inspection, and when sample mixture melting range is between 1450 DEG C～1500 DEG C, i.e. dispensing is qualified.The present invention solves the problem that cracking will not occur when negative electrode at high temperature works and come off.
Description
Technical field
The present invention relates to one and be applicable to travelling-wave tube negative electrode brazing solder and preparation method, belong to vacuum microwave device manufacture
Technical field.
Background technology
As electron source, barium-tungsten dispense cathode is widely used in all kinds of microwave device.In its preparation technology, tungsten cake with
The cathode tube supporting it is to be prepared as integrative-structure by drawing method, then carries out the dipping of cathode emission material, and this is little
The preparation of type negative electrode is feasible.But be as platinotron and day by day improve requirement, negative electrode draw total current raising and
The corresponding increase of cathode size, it will be the most feasible that tungsten cake is prepared as integrative-structure with the cathode tube supporting it by drawing method,
Reason is that size increases, negative electrode exist because the material coefficient of expansion is different in hot state tungsten cake and with support its cathode tube
There is cracking and the problem come off, in order to solve the preparation technology problem of large scale negative electrode, take a kind of tungsten cake and support it
Cathode tube between welding procedure, the firm welding of tungsten cake and cathode tube is reliable, so could meet microwave device various
Use under adverse circumstances.
In prior art, between tungsten cake and the cathode tube supporting it, use laser welding, due to the particularity of cathode material,
When laser welding, cathode emission material is readily volatilized and easily causes the poisoning of cathode.
Summary of the invention
It is an object of the invention to, overcome the defect that prior art exists, solve the weldering of tungsten cake and the cathode tube supporting it
Connecing problem, propose one and be applicable to travelling-wave tube negative electrode brazing solder and preparation method, this brazing solder is to negative electrode tungsten cake and negative electrode
The wellability of cylinder is good, solder trickling is abundant, tungsten cake is reliable with the firm welding of cathode tube, will not when negative electrode at high temperature works
There is cracking and come off.
The present invention adopts the following technical scheme that one is applicable to travelling-wave tube negative electrode brazing solder, it is characterised in that form into
Part is tungsten powder and cobalt powder binary mixture, and tungsten powder is 22.22:77.78 with the part by weight of cobalt powder.
The present invention also proposes a kind of preparation method being applicable to travelling-wave tube negative electrode brazing solder, it is characterised in that include as
Lower step:
Tungsten powder is put into hydrogen furnace 850 DEG C～900 DEG C and is annealed once by step SS1, is incubated 0.5-1 hour；
Cobalt oxide powder is put into hydrogen furnace 800 DEG C～850 DEG C before getting the raw materials ready and is reduced by step SS2, and insulation 15-20 divides
Clock, prepares pure cobalt powder；
Tungsten powder heat treated to described step SS1 and described step SS2 and cobalt powder are milled by step SS3, and with 200～
The screen cloth of 600 mesh screens；
Step SS4 is to put into corundum mortar after 22.22:77.78 weighs respectively according to the percentage by weight of tungsten powder Yu cobalt powder
In carry out mixing and mill, grinding time is 50～60 minutes, until tungsten powder and cobalt powder are thoroughly mixed prepared sample mixture；
The sample mixture that step SS5 takes a certain amount of described step SS5 prepared carries out solder melt point inspection, sample mixed
When thing melting range is between 1450 DEG C～1500 DEG C, i.e. dispensing is qualified.
The beneficial effect that the present invention is reached: the solder of the present invention and preparation method are to negative electrode tungsten cake and the infiltration of cathode tube
Property good, it is ensured that solder trickling is fully, it is achieved that tungsten cake and the reliable function of firm welding of cathode tube, solves negative electrode at height
During temperature lower work, cracking and the problem come off will not occur.
Accompanying drawing explanation
Detailed description of the invention
The invention will be further described below.Following example are only used for clearly illustrating the technical side of the present invention
Case, and can not limit the scope of the invention with this.
The present invention proposes one and is applicable to travelling-wave tube negative electrode brazing solder, it is characterised in that composition is tungsten powder and cobalt
Powder binary mixture, tungsten powder is 22.22:77.78 with the part by weight of cobalt powder.
The present invention also proposes a kind of preparation method being applicable to travelling-wave tube negative electrode brazing solder, it is characterised in that include as
Lower step:
Step SS1 selects microparticle (particle diameter 13 microns), the tungsten powder of high-purity (99.9%), and tungsten powder is put into hydrogen furnace
Interior 880 DEG C of annealing once, are incubated 45 minutes, thoroughly to purify, and strengthen tungsten powder plasticity；
The raw material of step SS2 cobalt powder is to exist with cobalt oxide form, selects microparticle (particle diameter 13 microns), high-purity
(99.9%) cobalt oxide powder, puts into cobalt oxide powder hydrogen furnace 830 DEG C before getting the raw materials ready and reduces, be incubated 20 minutes, with
Fully reduction obtains pure cobalt powder；
Tungsten powder heat treated to described step SS1 and described step SS2 and cobalt powder are milled by step SS3, and with 200～
The screen cloth of 600 mesh screens；
Step SS4 is to put into corundum mortar after 22.22:77.78 weighs respectively according to the percentage by weight of tungsten powder Yu cobalt powder
In carry out mixing and mill, grinding time is 60 minutes, until tungsten powder and cobalt powder are thoroughly mixed and do not form bulk, prepares sample and mixes
Compound；
The sample mixture that step SS5 takes a certain amount of described step SS5 prepared carries out solder melt point inspection, sample mixed
When thing melting range is between 1450 DEG C～1500 DEG C, i.e. dispensing is qualified.
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 (2)
1. one kind is applicable to travelling-wave tube negative electrode brazing solder, it is characterised in that composition is tungsten powder and cobalt powder binary mixture,
Tungsten powder is 22.22:77.78 with the part by weight of cobalt powder.
2. the preparation method being applicable to travelling-wave tube negative electrode brazing solder used described in claim 1, it is characterised in that bag
Include following steps:
Tungsten powder is put into hydrogen furnace 850 DEG C～900 DEG C and is annealed once by step SS1, is incubated 0.5-1 hour；
Cobalt oxide powder is put into hydrogen furnace 800 DEG C～850 DEG C before getting the raw materials ready and is reduced by step SS2, is incubated 15-20 minute,
Prepare pure cobalt powder；
Tungsten powder heat treated to described step SS1 and described step SS2 and cobalt powder are milled by step SS3, and with 200～600 mesh
Screen cloth screen；
Step SS4 is to put into enter in corundum mortar after 22.22:77.78 weighs respectively according to the percentage by weight of tungsten powder with cobalt powder
Row mixing is milled, and grinding time is 50～60 minutes, until tungsten powder and cobalt powder are thoroughly mixed prepared sample mixture；
The sample mixture that step SS5 takes a certain amount of described step SS5 prepared carries out solder melt point inspection, and sample mixture melts
When point range is between 1450 DEG C～1500 DEG C, i.e. dispensing is qualified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610704519.7A CN106238961A (en) | 2016-08-23 | 2016-08-23 | One is applicable to travelling-wave tube negative electrode brazing solder and preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610704519.7A CN106238961A (en) | 2016-08-23 | 2016-08-23 | One is applicable to travelling-wave tube negative electrode brazing solder and preparation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106238961A true CN106238961A (en) | 2016-12-21 |
Family
ID=57595800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610704519.7A Pending CN106238961A (en) | 2016-08-23 | 2016-08-23 | One is applicable to travelling-wave tube negative electrode brazing solder and preparation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106238961A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106736036A (en) * | 2017-01-06 | 2017-05-31 | 中国科学院金属研究所 | A kind of high-melting-point brazing alloy |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB838516A (en) * | 1956-06-20 | 1960-06-22 | Solar Aircraft Co | High temperature brazing alloys |
| US5066459A (en) * | 1990-05-18 | 1991-11-19 | General Electric Company | Advanced high-temperature brazing alloys |
| CN1727107A (en) * | 2004-07-30 | 2006-02-01 | 中国科学院电子学研究所 | The solder that is used for impregnated cathode |
| CN1915577A (en) * | 2006-08-17 | 2007-02-21 | 贵研铂业股份有限公司 | High temperature powder solder of superfine cobalt alloy |
| CN103921012A (en) * | 2014-04-04 | 2014-07-16 | 安徽华东光电技术研究所 | Preparation method of tungsten-cobalt solder for cathode, preparation method of brazed assembly and application of brazed assembly |
-
2016
- 2016-08-23 CN CN201610704519.7A patent/CN106238961A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB838516A (en) * | 1956-06-20 | 1960-06-22 | Solar Aircraft Co | High temperature brazing alloys |
| US5066459A (en) * | 1990-05-18 | 1991-11-19 | General Electric Company | Advanced high-temperature brazing alloys |
| CN1727107A (en) * | 2004-07-30 | 2006-02-01 | 中国科学院电子学研究所 | The solder that is used for impregnated cathode |
| CN1915577A (en) * | 2006-08-17 | 2007-02-21 | 贵研铂业股份有限公司 | High temperature powder solder of superfine cobalt alloy |
| CN103921012A (en) * | 2014-04-04 | 2014-07-16 | 安徽华东光电技术研究所 | Preparation method of tungsten-cobalt solder for cathode, preparation method of brazed assembly and application of brazed assembly |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106736036A (en) * | 2017-01-06 | 2017-05-31 | 中国科学院金属研究所 | A kind of high-melting-point brazing alloy |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20161221 |