CN106077619A - Metal dust high frequency annealing method - Google Patents
Metal dust high frequency annealing method Download PDFInfo
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- CN106077619A CN106077619A CN201610704520.XA CN201610704520A CN106077619A CN 106077619 A CN106077619 A CN 106077619A CN 201610704520 A CN201610704520 A CN 201610704520A CN 106077619 A CN106077619 A CN 106077619A
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- China
- Prior art keywords
- metal dust
- high frequency
- cartridge heater
- annealing method
- heating
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
- B22F1/142—Thermal or thermo-mechanical treatment
Abstract
Metal dust high frequency annealing method, including coreless induction furnace, it is characterised in that: comprise the following steps: a) metal dust grinds and screening；B) metal dust is weighed and puts into cartridge heater；C) cartridge heater is put into coreless induction furnace；D) evacuation preheating；E) heating；F) heating is terminated；G) cooling；H) metal dust is taken out.The coreless induction furnace equipment that the method uses is simple, and easy to operate, high-frequency heating completes by being arranged on the high frequency coil outside bell jar, heating process stabilizing, reliable.Metal dust high frequency annealing method is prone to grasp, and metal dust can eliminate surface oxide layer after high frequency annealing, increase plasticity, acquisition clean products.
Description
Technical field
The present invention relates to metal dust heat treatment method used by negative electrode, absorber in vacuum microwave device, specifically relate to
And metal dust high frequency annealing method.
Background technology
Travelling-wave tube, as vacuum microwave power amplifying device, has bandwidth, gain is big, efficiency is high, output is big
Advantage, has a wide range of applications in all kinds of military microwave transmitters, is described as " heart " of weaponry.Vacuum microwave device
The metal dusts such as tungsten powder, molybdenum powder, rhenium powder, nikel powder are often used in middle negative electrode, the making of absorber, and the powder being purchased commercially will be through
Crossing a series of PROCESS FOR TREATMENT and could meet use requirement, Technology for Heating Processing is one of them, existing metal dust heat treatment work
Skill is annealed in vertical hydrogen shield gas stove, to use substantial amounts of hydrogen and vertical heater in heat treatment process
Burner hearth is relatively big, needs the biggest heating power to can be only achieved annealing temperature process specification, therefore this technique weak point be cost height,
Efficiency is low.
Summary of the invention
It is an object of the invention to provide a kind of metal dust high frequency annealing method, the method uses the high frequency of simple in construction
Furnace apparatus, high-frequency heating completes by being arranged on the high frequency coil outside bell jar, heating process stabilizing, reliable.
For achieving the above object, the invention is realized by techniques below means:
Metal dust high frequency annealing method, including coreless induction furnace, it is characterised in that: comprise the following steps:
A) metal dust grinds and screening；
B) metal dust is weighed and puts into cartridge heater；
C) cartridge heater is put into coreless induction furnace；
D) evacuation preheating；
E) heating；
F) heating is terminated；
G) cooling；
H) metal dust is taken out.
Further:
Described step a) including:
Metal dust raw material is put in Achates alms bowl and is ground, milling time 45min～60min, then use 200
～600 mesh screen cloth screening.
Described step b) including:
Being weighed in a quantity as required by metal dust, be then placed in the cartridge heater of molybdenum system or tantalum, powder must not place
Exceed the 2/3 of cartridge heater height, be positioned over again after closeing the lid in the cartridge heater of another one molybdenum system or tantalum.
Described step c) including:
The molybdenum cartridge heater or the tantalum cartridge heater that are loaded into metal dust are positioned on coreless induction furnace bracket, are sealed by bell jar and place
After, then high frequency coil is positioned over molybdenum cartridge heater or the position of tantalum cartridge heater.
Described step d) including:
Opening mechanical pump and molecular pump, in treating bell jar, vacuum reaches 2～4 × 10-5After Pa, open heating generator filament
Power supply, filament voltage controls at 8.3V, after preheating 3min, starts to regulate high-frequency heating power.
Described step e) including:
According to venting situation, being gradually increased heating power, during heating, vacuum should be not less than 1 × 10-3Pa, different materials adds
Hot temperature is:
| Sequence number | Title material | Temperature, DEG C | Temperature retention time |
| 1 | Molybdenum powder | 1350-1600 | 1.5h～2h |
| 2 | Tungsten powder | 1500-1600 | 1.5h～2h |
| 3 | Rhenium powder | 1500-1600 | 1.5h～2h |
| 4 | Tantalum powder | 1000-1200 | 1h～1.5h |
| 5 | Nikel powder | 800-950 | 30min～45min |
。
Described step f) including:
At the end of heating, close heating power supply, gradually filament voltage is down to zero.
Described step g) including:
Cooling bell jar and heat treated metal dust, the time is no less than 30min.
Described step h) including:
Rise high frequency coil, move it on one side, close vacuometer, molecular pump and mechanical pump, open vent valve, to bell jar
In put into air, take off bell jar, will be equipped with the molybdenum cartridge heater of metal dust or tantalum cartridge heater takes out, i.e. complete metal powder to this
The high frequency annealing at end processes.
The invention provides the benefit that:
Detailed description of the invention
The present invention is described in further details with the tungsten powder manufacturing negative electrode for example:
Tungsten powder high frequency annealing method is:
A) tungsten powder raw material is put in Achates alms bowl it is ground, milling time 50min, then use 200～600 purposes
Screen cloth screens；
B) being weighed by tungsten powder 200 grams and put in molybdenum cartridge heater, tungsten powder is placed and be must not exceed the 2/3 of cartridge heater height, lid
After upper cover, set is put in another one molybdenum cartridge heater again；
C) the molybdenum cartridge heater that will be equipped with tungsten powder is positioned on coreless induction furnace bracket, is sealed by bell jar after placing, then by high frequency
Coil is positioned over the position of molybdenum cylinder；
D) open mechanical pump and molecular pump, after vacuum reaches 4 × 10-5Pa in bell jar, open heating generator filament
Power supply, filament voltage controls at 8.3V, after preheating 3min, starts to regulate high-frequency heating power；
E) metal dust is before high frequency annealing, is positioned in air and often sucks moisture, and metal dust has simultaneously
Partial oxidation, when high frequency annealing heats due to the metal dust release oxygen of moisture evaporation and partial oxidation, therefore can release one
Quantitative gas, in order to ensure metal powder high-frequency annealing quality, should be gradually increased heating power, and during to heat, vacuum should not
Less than 1 × 10-3Preferably, tungsten powder annealing process specification is temperature 1600 DEG C to Pa, temperature retention time 90min；
F), at the end of insulation, close heating power supply, gradually filament voltage is down to zero；
G) cooling bell jar and heat treated tungsten powder, cool time 45min；
H) rise high frequency coil, move it on one side, close vacuometer, molecular pump and mechanical pump, open vent valve, Xiang Zhong
Putting into air in cover, take off bell jar, the molybdenum cylinder that will be equipped with tungsten powder takes out.
The high frequency annealing i.e. completing tungsten powder to this processes.
The ultimate principle of the invention, principal character and advantage have more than been shown and described.The technical staff of the industry
It should be appreciated that the design is not restricted to the described embodiments, described in above-described embodiment and description, the design is simply described
Principle, on the premise of without departing from the design spirit and scope, the invention also has various changes and modifications, these become
In the range of change and improvement both fall within claimed the design.The invention claims scope by appending claims
And equivalent defines.
Claims (9)
1. metal dust high frequency annealing method, including coreless induction furnace, it is characterised in that: comprise the following steps:
A) metal dust grinds and screening；
B) metal dust is weighed and puts into cartridge heater；
C) cartridge heater is put into coreless induction furnace；
D) evacuation preheating；
E) heating；
F) heating is terminated；
G) cooling；
H) metal dust is taken out.
2. metal dust high frequency annealing method as claimed in claim 1, it is characterised in that: described step a) including:
Metal dust raw material is put in Achates alms bowl and is ground, milling time 45min～60min, then use 200～
The screen cloth screening of 600 mesh.
3. metal dust high frequency annealing method as claimed in claim 1, it is characterised in that: described step b) including:
Being weighed in a quantity as required by metal dust, be then placed in the cartridge heater of molybdenum system or tantalum, powder is placed and be must not exceed
The 2/3 of cartridge heater height, is positioned over after closeing the lid in the cartridge heater of another one molybdenum system or tantalum again.
4. metal dust high frequency annealing method as claimed in claim 1, it is characterised in that: described step c) including:
The molybdenum cartridge heater or the tantalum cartridge heater that are loaded into metal dust are positioned on coreless induction furnace bracket, are sealed by bell jar after placing,
High frequency coil is positioned over molybdenum cartridge heater or the position of tantalum cartridge heater again.
5. metal dust high frequency annealing method as claimed in claim 1, it is characterised in that: described step d) including:
Opening mechanical pump and molecular pump, in treating bell jar, vacuum reaches 2～4 × 10-5After Pa, open heating generator filament electricity
Source, filament voltage controls at 8.3V, after preheating 3min, starts to regulate high-frequency heating power.
6. metal dust high frequency annealing method as claimed in claim 1, it is characterised in that: described step e) including:
According to venting situation, being gradually increased heating power, during heating, vacuum should be not less than 1 × 10-3Pa, different materials heating temperature
Degree is:
7. metal dust high frequency annealing method as claimed in claim 1, it is characterised in that: described step f) including:
At the end of heating, close heating power supply, gradually filament voltage is down to zero.
8. metal dust high frequency annealing method as claimed in claim 1, it is characterised in that: described step g) including:
Cooling bell jar and heat treated metal dust, the time is no less than 30min.
9. metal dust high frequency annealing method as claimed in claim 1, it is characterised in that: described step h) including:
Rise high frequency coil, move it on one side, close vacuometer, molecular pump and mechanical pump, open vent valve, put in bell jar
Entering air, take off bell jar, the molybdenum cartridge heater or the tantalum cartridge heater that will be equipped with metal dust take out, and i.e. complete metal dust to this
High frequency annealing processes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610704520.XA CN106077619A (en) | 2016-08-23 | 2016-08-23 | Metal dust high frequency annealing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610704520.XA CN106077619A (en) | 2016-08-23 | 2016-08-23 | Metal dust high frequency annealing method |
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| Publication Number | Publication Date |
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| CN106077619A true CN106077619A (en) | 2016-11-09 |
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| CN201610704520.XA Pending CN106077619A (en) | 2016-08-23 | 2016-08-23 | Metal dust high frequency annealing method |
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Citations (8)
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|---|---|---|---|---|
| SU865526A1 (en) * | 1979-06-05 | 1981-09-23 | Куйбышевский Ордена Трудового Красного Знамени Авиационный Институт Им.Академика С.П.Королева | Method of making sintered magnetic cores |
| JPH0410502A (en) * | 1990-04-27 | 1992-01-14 | Furukawa Electric Co Ltd:The | Manufacture of oxidation resistant plastic magnet |
| CN1940111A (en) * | 2005-09-27 | 2007-04-04 | 同济大学 | Nano-crystal soft magnetic alloy material and its production |
| JP2008195970A (en) * | 2007-02-08 | 2008-08-28 | Nec Tokin Corp | Composite magnetic material, powder magnetic core and magnetic element |
| CN102280241A (en) * | 2011-08-20 | 2011-12-14 | 陈登刚 | Manufacturing process for iron-silicon-aluminum soft magnetic powder |
| CN102339702A (en) * | 2011-07-19 | 2012-02-01 | 安徽华东光电技术研究所 | Preparation method of Kovar heat shield of multi-beam traveling wave tube cathode |
| CN102765946A (en) * | 2012-07-05 | 2012-11-07 | 中国科学院宁波材料技术与工程研究所 | Current assisted method for quickly preparing powder |
| CN103273068A (en) * | 2013-05-22 | 2013-09-04 | 安泰科技股份有限公司 | Iron-based amorphous powder and method for preparing coil-embedded integral-forming inductor |
-
2016
- 2016-08-23 CN CN201610704520.XA patent/CN106077619A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU865526A1 (en) * | 1979-06-05 | 1981-09-23 | Куйбышевский Ордена Трудового Красного Знамени Авиационный Институт Им.Академика С.П.Королева | Method of making sintered magnetic cores |
| JPH0410502A (en) * | 1990-04-27 | 1992-01-14 | Furukawa Electric Co Ltd:The | Manufacture of oxidation resistant plastic magnet |
| CN1940111A (en) * | 2005-09-27 | 2007-04-04 | 同济大学 | Nano-crystal soft magnetic alloy material and its production |
| JP2008195970A (en) * | 2007-02-08 | 2008-08-28 | Nec Tokin Corp | Composite magnetic material, powder magnetic core and magnetic element |
| CN102339702A (en) * | 2011-07-19 | 2012-02-01 | 安徽华东光电技术研究所 | Preparation method of Kovar heat shield of multi-beam traveling wave tube cathode |
| CN102280241A (en) * | 2011-08-20 | 2011-12-14 | 陈登刚 | Manufacturing process for iron-silicon-aluminum soft magnetic powder |
| CN102765946A (en) * | 2012-07-05 | 2012-11-07 | 中国科学院宁波材料技术与工程研究所 | Current assisted method for quickly preparing powder |
| CN103273068A (en) * | 2013-05-22 | 2013-09-04 | 安泰科技股份有限公司 | Iron-based amorphous powder and method for preparing coil-embedded integral-forming inductor |
Non-Patent Citations (3)
| Title |
|---|
| 沈华生 等: "《有色金属条目选辑 征求意见稿》", 28 February 1982, 中国大百科全书出版社 * |
| 董世柱 等: "《热处理工实际操作手册》", 31 August 2006, 辽宁科学技术出版社 * |
| 陈裕川: "《钨极惰性气体保护焊》", 31 January 2015, 机械工业出版社 * |
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Application publication date: 20161109 |
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