CN107020448B - A kind of preparation method of grounded screen exothermic weld welding powder - Google Patents
A kind of preparation method of grounded screen exothermic weld welding powder Download PDFInfo
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- CN107020448B CN107020448B CN201710132847.9A CN201710132847A CN107020448B CN 107020448 B CN107020448 B CN 107020448B CN 201710132847 A CN201710132847 A CN 201710132847A CN 107020448 B CN107020448 B CN 107020448B
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- 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
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Abstract
The present invention relates to a kind of grounded screen preparation methods of exothermic weld welding powder, belong to welding powder technical field.The present invention has expulsion events during welding for the heat release welding powder of current domestic production, it is unfavorable for welding personnel safety, and there is the problem of stomata and slag inclusion inside connector, the present invention is dispersed in isopropanol using aluminium isopropoxide, pH is adjusted by nitric acid solution, obtain Aluminum sol, copper oxide is added thereto again, surfactant, activation modification is carried out to it, make copper oxide with aluminium is more uniform mixes, polyethylene glycol is reused as carrier, aluminium and copper is set to carry out absorption combination by silane coupling agent, increase element silicon simultaneously, copper aluminium crystalline solid is obtained by freezing processing, then it is aided with addition platinum and increases welding effect, finally mixing with Fluorspar Powder reduces fusing point, pass through melting, atomization, grounded screen exothermic weld welding powder is made.Grounded screen prepared by the present invention with exothermic weld welding powder during welding without expulsion events, and pore-free and slag inclusion inside connector.
Description
Technical field
The present invention relates to a kind of grounded screen preparation methods of exothermic weld welding powder, belong to welding powder technical field.
Background technique
Grounding net of transformer substation is the indispensable facility for working earthing, protective grounding and lightning protection, is to guarantee equipment, be
It unites, the important link of personal safety, it plays the important function of pressure and aerial drainage in antistatic, thunder and lightning and fault current.It is long
Since the electrical performance demands to earthed system are not high since phase, the Joining Technology between conductor when using steel as earth conductor
Often welded using the methods of electric resistance welding, soldering, welding electrode arc welding.These welding manners are made due to being affected by human factors
At the unstable of joint quality, destruction of the welding to welding base metal itself, in soil corrosion of butt joints such as acid or alkali etc. all without
Method makes earthed system keep efficient and steady in a long-term operation.Compared with these welding methods, exothermic weld be it is a kind of simple,
The advanced Metal Bonding Technology of high efficiency, high quality is a kind of real molecule welding
Exothermic weld is using the chemical reaction heat generated when aluminum reduction metal oxide as heat source, melting welding powder and base material shape
At weld metal, belong to thermit welding.This technology is used in commonly known as exothermic welding in railway construction, metal oxidation in welding powder
Object is generally iron oxide, and the mechanical mechanics property of welding point is more demanding.And the particularity requirement of power engineering earthed system
It must be using ground resistance be lower, more corrosion-resistant material, for the service performance for guaranteeing and improving earthed system, foreign standard
Allow to cover steel as earthing material using copper material or copper, therefore the metal oxide of heat release welding powder is generally oxygen in the grounding project
Change copper, the fusing point and Corrosion resistance of Welded Joints are more demanding.
The heat release welding powder that the country uses at present is mostly imported product, and price is higher, is unfavorable for promoting the use of on a large scale, and
There is variety of problems in the welding powder quality of some domestic manufacturer's productions, as welding point fusing point is too low, it is difficult to reach and base material phase again
When fusing point；There are expulsion events during welding, is unfavorable for welding personnel safety；There are stomata and slag inclusion phenomenon etc. inside connector.
Summary of the invention
The technical problems to be solved by the invention: there is splash during welding for the heat release welding powder of current domestic production
Phenomenon is unfavorable for welding personnel safety, and has the problem of stomata and slag inclusion inside connector, and the present invention is uniformly divided using aluminium isopropoxide
It dissipates in isopropanol, pH is adjusted by nitric acid solution, obtains Aluminum sol, then copper oxide, surfactant are added thereto, to it
Carry out activation modification, make copper oxide with aluminium is more uniform mixes, reuse polyethylene glycol as carrier, aluminium and copper made to pass through silane
Coupling agent carries out absorption combination, while increasing element silicon, obtains copper aluminium crystalline solid by freezing processing, is then aided with addition platinum
Increase welding effect, finally mixing with Fluorspar Powder reduces fusing point, and by melting, being atomized, grounded screen exothermic weld welding powder is made.
Grounded screen prepared by the present invention is with exothermic weld welding powder without nothing inside expulsion events, safe operation, and connector during welding
Stomata and slag inclusion.
In order to solve the above technical problems, the present invention is using technical solution as described below:
(1) 1:6 in mass ratio takes aluminium isopropoxide and isopropanol to be put into container, and container is placed in ultrasonic oscillation device
In, 20~30min is shaken with 1.5~2.0MHz, then container is put into water-bath, the nitric acid for the use of mass fraction being 50% is molten
Liquid adjusts pH to 3.5~4.0, and set temperature is 70~75 DEG C, stirs 2~3h with 160r/min；
(2) after above-mentioned stirring, the N- acyl of above-mentioned aluminium isopropoxide quality 1.3~2.2% is separately added into container
Three uncle of vinyl of base amino acid, the copper oxide of above-mentioned aluminium isopropoxide quality 20~25% and above-mentioned aluminium isopropoxide quality 5~7%
Butyl peroxy silane is warming up to 80~85 DEG C, stirs 20~25min with 200r/min；
(3) to above-mentioned stirring after the mixture in container is put into autoclave, be added into reaction kettle mixed
The polyethylene glycol for closing amount of substance 10~15%, using hydrogen shield, and is boosted to 1.3~2.3MPa, is warming up to 9 DEG C/min
210~220 DEG C, 7~9h is stirred with 110r/min, subsequent cooled to room temperature discharges, and the use of mass fraction is 20%
Sodium hydroxide solution adjusts out material pH to neutrality, then will go out material and be placed in 4~6h of standing under 2~4 DEG C of environment；
(4) material that goes out after above-mentioned standing is filtered, filter residue is put into Muffle furnace, set temperature is 300~350
DEG C, 30~50min is calcined, then by the platinum and calcined material quality 1.8~2.1% of calcined material and calcined material quality 0.8~1.3%
Graphite, be put into ball mill, using nitrogen protection, with 400r/min 1~2h of ball milling, collect ball milling object；
(5) above-mentioned ball milling object is uniformly mixed with 200 mesh Fluorspar Powders of ball milling amount of substance 4~6%, is put into vaccum sensitive stove
In, set temperature is 1700~1800 DEG C, and melting liquid is then put into metal atomization device by 30~40min of melting, atomization pressure
Power is set as 4~5MPa, and draft-tube diameter is 3~5mm, and flow velocity is 12~14kg/min, collects atomized powder, can must be grounded
Net exothermic weld welding powder.
Application method of the invention: heat source for baking mold and conductor are used before welding, it is ensured that it is dry, if there is impurity that must remove,
Conductor is put into mold and is clamped, is assisted when necessary with C clamp, pallet is put into die cavity, die hole is blocked and holds welding powder,
Welding powder is poured into mold, along igniting powder is sprinkled from welding powder surface to mould, die cap is closed, is lighted a fire with burning torch, from welding powder surface
To mould along igniting powder is sprinkled, after 20~25s, it can be opened, be welded successfully.Conductor after detection welding obtains: surface is smooth, pore-free
And slag inclusion, section is fine and close, and without expulsion events during welding, welding powder connector tensile strength is 372~414MPa, and resistance value is
1.66~1.71 × 10-5 Ω.
The present invention is compared with other methods, and advantageous effects are:
(1) grounded screen prepared by the present invention with exothermic weld welding powder during welding without expulsion events, safe operation, and
Pore-free and slag inclusion inside connector；
(2) grounded screen prepared by the present invention exothermic weld welding powder has high security, low-porosity, cost performance height.
Specific embodiment
1:6 in mass ratio takes aluminium isopropoxide and isopropanol to be put into container, and container is placed in ultrasonic oscillation device,
20~30min is shaken with 1.5~2.0MHz, then container is put into water-bath, the nitric acid solution for the use of mass fraction being 50%
PH to 3.5~4.0 is adjusted, set temperature is 70~75 DEG C, stirs 2~3h with 160r/min；
After above-mentioned stirring, the N- acyl group ammonia of above-mentioned aluminium isopropoxide quality 1.3~2.2% is separately added into container
Base acid, the copper oxide of above-mentioned aluminium isopropoxide quality 20~25% and the vinyl tri-tert of above-mentioned aluminium isopropoxide quality 5~7%
Peroxy-silane is warming up to 80~85 DEG C, stirs 20~25min with 200r/min；It will be mixed in container after to above-mentioned stirring
It closes object to be put into autoclave, the polyethylene glycol of mixture quality 10~15% is added into reaction kettle, using hydrogen shield,
And 1.3~2.3MPa is boosted to, and 210~220 DEG C are warming up to 9 DEG C/min, 7~9h is stirred with 110r/min, it is then naturally cold
But it to room temperature, discharges, is that 20% sodium hydroxide solution adjusts out material pH to neutrality, then will go out material using mass fraction
It is placed in 4~6h of standing under 2~4 DEG C of environment；The material that goes out after above-mentioned standing is filtered, filter residue is put into Muffle furnace, if
Determining temperature is 300~350 DEG C, calcines 30~50min, then by the platinum and calcining of calcined material and calcined material quality 0.8~1.3%
The graphite of amount of substance 1.8~2.1%, is put into ball mill, collects ball milling using nitrogen protection with 400r/min 1~2h of ball milling
Object；Above-mentioned ball milling object is uniformly mixed with 200 mesh Fluorspar Powders of ball milling amount of substance 4~6%, is put into vaccum sensitive stove, is set
Temperature is 1700~1800 DEG C, and melting liquid is then put into metal atomization device by 30~40min of melting, atomizing pressure setting
For 4~5MPa, draft-tube diameter is 3~5mm, and flow velocity is 12~14kg/min, collects atomized powder, can obtain grounded screen with putting
Thermal weld welding powder.
Example 1
1:6 in mass ratio takes aluminium isopropoxide and isopropanol to be put into container, and container is placed in ultrasonic oscillation device,
Shake 20min with 1.5MHz, then container be put into water-bath, using the nitric acid solution that mass fraction is 50% adjust pH to
3.5, set temperature is 70 DEG C, stirs 2h with 160r/min；After above-mentioned stirring, above-mentioned isopropyl is separately added into container
The N- acylamino acid of aluminium alcoholates quality 1.3%, the copper oxide of above-mentioned aluminium isopropoxide quality 20% and above-mentioned aluminium isopropoxide quality 5%
Vinyl silane tri-butyl peroxy, be warming up to 80 DEG C, with 200r/min stir 20min；It will hold after to above-mentioned stirring
Mixture in device is put into autoclave, and the polyethylene glycol of mixture quality 10% is added into reaction kettle, uses hydrogen
Protection, and boosts to 1.3MPa, is warming up to 210 DEG C with 9 DEG C/min, stirs 7h with 110r/min, subsequent cooled to room temperature,
It discharges, is that 20% sodium hydroxide solution adjusts out material pH to neutrality, then will go out material and be placed in 2 DEG C of rings using mass fraction
4h is stood under border；The material that goes out after above-mentioned standing is filtered, filter residue is put into Muffle furnace, set temperature is 300 DEG C, is forged
It burns 30min and is put into ball mill then by calcined material and the platinum of calcined material quality 0.8% and the graphite of calcined material quality 1.8%
In, ball milling object is collected with 400r/min ball milling 1h using nitrogen protection；By above-mentioned ball milling object and the 200 of ball milling amount of substance 4%
Mesh Fluorspar Powder is uniformly mixed, and is put into vaccum sensitive stove, and set temperature is 1700 DEG C, and melting liquid is then put by melting 30min
In metal atomization device, atomizing pressure is set as 4MPa, draft-tube diameter 3mm, flow velocity 12kg/min, collects atomized powder
End can obtain grounded screen exothermic weld welding powder.
Application method of the invention: heat source for baking mold and conductor are used before welding, it is ensured that it is dry, if there is impurity that must remove,
Conductor is put into mold and is clamped, is assisted when necessary with C clamp, pallet is put into die cavity, die hole is blocked and holds welding powder,
Welding powder is poured into mold, along igniting powder is sprinkled from welding powder surface to mould, die cap is closed, is lighted a fire with burning torch, from welding powder surface
To mould along igniting powder is sprinkled, after 20s, it can be opened, be welded successfully.Conductor after detection welding obtains: surface is smooth, pore-free and folder
Slag, section is fine and close, and without expulsion events during welding, welding powder connector tensile strength is 372MPa, and resistance value is 1.66 × 10-
5Ω。
Example 2
1:6 in mass ratio takes aluminium isopropoxide and isopropanol to be put into container, and container is placed in ultrasonic oscillation device,
Shake 30min with 2.0MHz, then container be put into water-bath, using the nitric acid solution that mass fraction is 50% adjust pH to
4.0, set temperature is 75 DEG C, stirs 3h with 160r/min；After above-mentioned stirring, above-mentioned isopropyl is separately added into container
The N- acylamino acid of aluminium alcoholates quality 2.2%, the copper oxide of above-mentioned aluminium isopropoxide quality 25% and above-mentioned aluminium isopropoxide quality 7%
Vinyl silane tri-butyl peroxy, be warming up to 85 DEG C, with 200r/min stir 25min；It will hold after to above-mentioned stirring
Mixture in device is put into autoclave, and the polyethylene glycol of mixture quality 15% is added into reaction kettle, uses hydrogen
Protection, and boosts to 2.3MPa, is warming up to 220 DEG C with 9 DEG C/min, stirs 9h with 110r/min, subsequent cooled to room temperature,
It discharges, is that 20% sodium hydroxide solution adjusts out material pH to neutrality, then will go out material and be placed in 4 DEG C of rings using mass fraction
6h is stood under border；The material that goes out after above-mentioned standing is filtered, filter residue is put into Muffle furnace, set temperature is 350 DEG C, is forged
It burns 50min and is put into ball mill then by calcined material and the platinum of calcined material quality 1.3% and the graphite of calcined material quality 2.1%
In, ball milling object is collected with 400r/min ball milling 2h using nitrogen protection；By above-mentioned ball milling object and the 200 of ball milling amount of substance 6%
Mesh Fluorspar Powder is uniformly mixed, and is put into vaccum sensitive stove, and set temperature is 1800 DEG C, and melting liquid is then put by melting 40min
In metal atomization device, atomizing pressure is set as 5MPa, draft-tube diameter 5mm, flow velocity 14kg/min, collects atomized powder
End can obtain grounded screen exothermic weld welding powder.
Application method of the invention: heat source for baking mold and conductor are used before welding, it is ensured that it is dry, if there is impurity that must remove,
Conductor is put into mold and is clamped, is assisted when necessary with C clamp, pallet is put into die cavity, die hole is blocked and holds welding powder,
Welding powder is poured into mold, along igniting powder is sprinkled from welding powder surface to mould, die cap is closed, is lighted a fire with burning torch, from welding powder surface
To mould along igniting powder is sprinkled, after 25s, it can be opened, be welded successfully.Conductor after detection welding obtains: surface is smooth, pore-free and folder
Slag, section is fine and close, and without expulsion events during welding, welding powder connector tensile strength is 414MPa, and resistance value is 1.71 × 10-
5Ω。
Example 3
1:6 in mass ratio takes aluminium isopropoxide and isopropanol to be put into container, and container is placed in ultrasonic oscillation device,
Shake 25min with 1.8MHz, then container be put into water-bath, using the nitric acid solution that mass fraction is 50% adjust pH to
3.8, set temperature is 72 DEG C, stirs 2h with 160r/min；After above-mentioned stirring, above-mentioned isopropyl is separately added into container
The N- acylamino acid of aluminium alcoholates quality 1.8%, the copper oxide of above-mentioned aluminium isopropoxide quality 23% and above-mentioned aluminium isopropoxide quality 6%
Vinyl silane tri-butyl peroxy, be warming up to 83 DEG C, with 200r/min stir 23min；It will hold after to above-mentioned stirring
Mixture in device is put into autoclave, and the polyethylene glycol of mixture quality 13% is added into reaction kettle, uses hydrogen
Protection, and boosts to 1.8MPa, is warming up to 215 DEG C with 9 DEG C/min, stirs 8h with 110r/min, subsequent cooled to room temperature,
It discharges, is that 20% sodium hydroxide solution adjusts out material pH to neutrality, then will go out material and be placed in 3 DEG C of rings using mass fraction
5h is stood under border；The material that goes out after above-mentioned standing is filtered, filter residue is put into Muffle furnace, set temperature is 320 DEG C, is forged
It burns 40min and is put into ball mill then by calcined material and the platinum of calcined material quality 1.1% and the graphite of calcined material quality 1.9%
In, ball milling object is collected with 400r/min ball milling 2h using nitrogen protection；By above-mentioned ball milling object and the 200 of ball milling amount of substance 5%
Mesh Fluorspar Powder is uniformly mixed, and is put into vaccum sensitive stove, and set temperature is 1750 DEG C, and melting liquid is then put by melting 35min
In metal atomization device, atomizing pressure is set as 5MPa, draft-tube diameter 4mm, flow velocity 13kg/min, collects atomized powder
End can obtain grounded screen exothermic weld welding powder.
Application method of the invention: heat source for baking mold and conductor are used before welding, it is ensured that it is dry, if there is impurity that must remove,
Conductor is put into mold and is clamped, is assisted when necessary with C clamp, pallet is put into die cavity, die hole is blocked and holds welding powder,
Welding powder is poured into mold, along igniting powder is sprinkled from welding powder surface to mould, die cap is closed, is lighted a fire with burning torch, from welding powder surface
To mould along igniting powder is sprinkled, after 23s, it can be opened, be welded successfully.Conductor after detection welding obtains: surface is smooth, pore-free and folder
Slag, section is fine and close, and without expulsion events during welding, welding powder connector tensile strength is 391MPa, and resistance value is 1.69 × 10-
5Ω。
Claims (1)
1. a kind of grounded screen preparation method of exothermic weld welding powder, it is characterised in that specific preparation step are as follows:
(1) 1:6 in mass ratio takes aluminium isopropoxide and isopropanol to be put into container, and container is placed in ultrasonic oscillation device, with
1.5~2.0MHz shakes 20~30min, then container is put into water-bath, the nitric acid solution tune for the use of mass fraction being 50%
PH to 3.5~4.0 is saved, set temperature is 70~75 DEG C, stirs 2~3h with 160r/min；
(2) after above-mentioned stirring, the N- acyl group ammonia of above-mentioned aluminium isopropoxide quality 1.3~2.2% is separately added into container
Base acid, the copper oxide of above-mentioned aluminium isopropoxide quality 20~25% and the vinyl tri-tert of above-mentioned aluminium isopropoxide quality 5~7%
Peroxy-silane is warming up to 80~85 DEG C, stirs 20~25min with 200r/min；
(3) to above-mentioned stirring after the mixture in container is put into autoclave, mixture is added into reaction kettle
The polyethylene glycol of quality 10~15% using hydrogen shield, and boosts to 1.3~2.3MPa, 210 are warming up to 9 DEG C/min~
220 DEG C, 7~9h is stirred with 110r/min, subsequent cooled to room temperature discharges, and the use of mass fraction is 20% hydrogen-oxygen
Change sodium solution and adjust out material pH to neutrality, then material will be gone out and be placed in 4~6h of standing under 2~4 DEG C of environment；
(4) material that goes out after above-mentioned standing being filtered, filter residue is put into Muffle furnace, set temperature is 300~350 DEG C,
30~50min is calcined, then by the platinum and calcined material quality 1.8~2.1% of calcined material and calcined material quality 0.8~1.3%
Graphite is put into ball mill, collects ball milling object using nitrogen protection with 400r/min 1~2h of ball milling；
(5) above-mentioned ball milling object is uniformly mixed with 200 mesh Fluorspar Powders of ball milling amount of substance 4~6%, is put into vaccum sensitive stove,
Set temperature is 1700~1800 DEG C, and melting liquid is then put into metal atomization device, atomizing pressure by 30~40min of melting
It is set as 4~5MPa, draft-tube diameter is 3~5mm, and flow velocity is 12~14kg/min, collects atomized powder, can obtain grounded screen
With exothermic weld welding powder.
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| CN103071949A (en) * | 2013-02-26 | 2013-05-01 | 武汉大学 | Self-propagating welding powder |
| CN104043913A (en) * | 2014-06-24 | 2014-09-17 | 国家电网公司 | Exothermic welding powder for welding novel grounding grid materials |
| CN106141499A (en) * | 2016-08-05 | 2016-11-23 | 雷春生 | A kind of grounding grid heat release welding preparation method of ultra-fine welding powder |
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2017
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| JPS6090875A (en) * | 1983-10-21 | 1985-05-22 | 三菱重工業株式会社 | Ceramic and matal bonding method |
| CN101745636A (en) * | 2008-12-16 | 2010-06-23 | 北京有色金属研究总院 | Method for preparing antioxidant soldering powder |
| CN103071949A (en) * | 2013-02-26 | 2013-05-01 | 武汉大学 | Self-propagating welding powder |
| CN104043913A (en) * | 2014-06-24 | 2014-09-17 | 国家电网公司 | Exothermic welding powder for welding novel grounding grid materials |
| CN106141499A (en) * | 2016-08-05 | 2016-11-23 | 雷春生 | A kind of grounding grid heat release welding preparation method of ultra-fine welding powder |
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Effective date of registration: 20201216 Address after: No.89 Quanzhou Road, Rizhao Economic Development Zone, Shandong Province Patentee after: Rizhao Dazheng welding materials Co.,Ltd. Address before: Room 7088-7, 7 / F, 1558 Jiangnan Road, Ningbo hi tech Zone, Ningbo City, Zhejiang Province Patentee before: Ningbo Hi-tech Zone Yuanchuang Technology Co.,Ltd. |
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Denomination of invention: A preparation method of exothermic welding powder for grounding grid Effective date of registration: 20210630 Granted publication date: 20190416 Pledgee: Rizhao Bank Development Zone sub branch Pledgor: Rizhao Dazheng welding materials Co.,Ltd. Registration number: Y2021980005586 |