CN101658968A - Welding method of nickel-zinc ferrite and oxygen-free copper substrate - Google Patents
Welding method of nickel-zinc ferrite and oxygen-free copper substrate Download PDFInfo
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- CN101658968A CN101658968A CN200910093251A CN200910093251A CN101658968A CN 101658968 A CN101658968 A CN 101658968A CN 200910093251 A CN200910093251 A CN 200910093251A CN 200910093251 A CN200910093251 A CN 200910093251A CN 101658968 A CN101658968 A CN 101658968A
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Abstract
The invention discloses a welding method of nickel-zinc ferrite and an oxygen-free copper substrate, belonging to the technical fields of radio frequency energy attenuation and the like. The method includes the steps of: firstly burning a silver infiltrated layer in the air to metalize the nickel-zinc ferrite and form a transition layer with the thickness of 10-20Mum; and then using Sn-Ag alloy solder to weld the nickel-zinc ferrite and oxygen-free copper under vacuum with the welding temperature of being 300-380 DEG C. The welding method of nickel-zinc ferrite and the oxygen-free copper substrate avoids the crack of the ferrite and the deterioration of the ferrite in performance caused by excessively high brazing temperature, thus solving problems occurring when preparing a nickel-zinc ferrite absorber. The low-temperature welding method can be extended to the welding application between other ferrites and oxygen-free copper or stainless steel to achieve wider application value.
Description
Technical field
The invention belongs to technical fields such as being used for the RF energy decay, the welding method of particularly a kind of nickel-zinc ferrite and oxygen-free copper substrate.
Background technology
In the application of beam head-on collision accelerator such as CESR and KEK-B, the ferrite absorber has obtained successful application in the continuous radio-frequency cavity of its high stream.This Ferrite Material since have high electromagnetic consumable characteristic can effective attenuation or absorb RF energy up to tens kW, thereby avoided the infringements such as multi beam unstability that high line brought thus.
Usually, the Ferrite Material of this sheet is realized its function by bonding on the oxygen-free copper substrate.Yet this bonding must meeting the following conditions, as realizing good thermo-contact with substrate, can resist common high vacuum baking temperature (about 200 ℃), reduce mechanical stress as far as possible and avoid using organic matter or lead etc. to be not suitable for the material that high vacuum environment uses.At present, the ceramic material of using in RF application (as aluminium oxide etc.), its method for metallising is mainly realized by high temperature brazing.Yet for nickel-zinc-ferrite material, this high-temp soldering method but may be because following several former thereby lost efficacy: because the thermal coefficient of expansion of nickel-zinc ferrite and oxygen-free copper substrate differs big and brazing temperature too high (about 800 ℃), the stress that produces in the high temperature brazing cooling procedure causes ferrite to rupture; High temperature brazing is carried out in high temperature, high vacuum or reducing atmosphere usually, and ferritic stoichiometric composition changes under this condition easily, thereby causes ferrite performance to worsen.Therefore, thus can at present maximum challenge be develop a kind of novel suitable nickel-zinc ferrite and the method for attachment of oxygen-free copper substrate is effectively used this ferrite absorber in the environment of high vacuum.
Summary of the invention
The welding method that the purpose of this invention is to provide a kind of nickel-zinc ferrite and oxygen-free copper substrate.
The welding method of a kind of nickel-zinc ferrite and oxygen-free copper substrate is characterized in that, this method is carried out according to the following steps:
(1) cleans nickel-zinc ferrite, clean the back and in 200-250 ℃ of baking oven, dry, reduce to room temperature;
(2) adopt method for printing screen to apply the silver slurry that a layer thickness is 20-40 μ m equably on nickel-zinc ferrite, dry in 100-150 ℃ of baking oven then, above-mentioned coating and oven dry are handled and can be carried out one or many;
(3) nickel-zinc ferrite of silver coating slurry in the step (2) is carried out the burning infiltration silver layer and make its metallization, the burning infiltration silver layer carries out in air atmosphere, be warming up to 500-620 ℃, insulation 5-90min, cooldown rate with 0.5-1.0 ℃/min cools to 250-300 ℃, naturally cool to room temperature then, the transition region thickness after the metallization is 10-20 μ m;
(4) behind the silver layer polishing light and purified treatment with the Ni Zn ferrimagnet surface, use the Sn-Ag solder that nickel-zinc ferrite and oxygen-free copper are welded under vacuum, be warming up to welding temperature: 300-380 ℃, insulation 5-90min naturally cools to room temperature then.
Clean described in the step (1) to nickel-zinc ferrite being put into alcohol and carry out the ultrasonic vibration cleaning.
The quality percentage composition of Ag is 1-10% in the described Sn-Ag alloy, and surplus is Sn.
Described Sn-Ag solder is a sheet, and thickness is 50-100 μ m.
A kind of optimized technical scheme, heating rate is 0.5-1.0 ℃/min described in the step (3).
A kind of optimized technical scheme, heating rate is 3-5 ℃/min described in the step (4).
Beneficial effect of the present invention is: the nickel-zinc ferrite of wood invention and the method for oxygen-free copper low-temperature welding, in effective welding that can realize nickel-zinc ferrite and oxygen-free copper below 300 ℃, the shear strength of weld layer reaches more than the 10Mpa, efficiently solves because the problem that too high ferrite fracture that causes of brazing temperature and ferrite performance worsen.Nickel-zinc ferrite of the present invention and oxygen-free copper low-temperature welding material can use in-10 ℃-200 ℃ temperature range, this welding method is applied to the ferrite absorber can makes it serve energy attenuation and absorption field better.Low-temperature welding method of the present invention can expand in other ferrite and oxygen-free copper or the stainless welding application, makes it obtain using value more widely.
The specific embodiment
The invention will be further described below in conjunction with embodiment:
Embodiment 1
The welding method of a kind of nickel-zinc ferrite and oxygen-free copper substrate, this method is carried out according to the following steps:
(1) nickel-zinc ferrite is put into alcohol and carried out ultrasonic vibration cleaning 10min, clean the back and in 220 ℃ of baking ovens, dry 5h, the temperature of nickel-zinc ferrite is reduced to room temperature;
(2) (used silver slurry is the middle temperature silver slurry of HD100-72 for the model of Non-Ferrous Metal Research Yixin New Material Co., Ltd to adopt method for printing screen to apply the thick silver slurry of one deck 20 μ m equably on nickel-zinc ferrite, this silver slurry is a kind of silver powder, adhesive, the mixture of solvent and flux, adhesive is mainly by rosin, organic matters such as ethyl cellulose are formed, solvent is mainly by turpentine oil, compositions such as terpinol, flux mainly is made up of low-melting compounds such as Pyrex, the burning infiltration temperature of this silver slurry is about about 600 ℃, the used silver slurry of following examples is identical therewith), dry in 120 ℃ baking oven then, adopting after the oven dry uses the same method carries out the coating second time and oven dry processing;
(3) nickel-zinc ferrite of silver coating slurry in the step (2) is carried out the burning infiltration silver layer and make its metallization, the burning infiltration silver layer carries out (following examples are identical therewith) in the intermediate sintering temperature stove, the burning infiltration silver layer carries out in air atmosphere, heating rate with 0.6 ℃/min is warming up to 550 ℃, insulation 10min, cooldown rate with 1.0 ℃/min cools to 300 ℃, naturally cools to room temperature then, and the transition region thickness that the metallization back forms is about 20 μ m;
(4) behind the silver layer polishing light and purified treatment with the Ni Zn ferrimagnet surface, used thickness is that (the quality percentage composition of Ag is 1% in the Sn-Ag alloy for the sheet Sn-1Ag alloy of 50 μ m, surplus is Sn) scolder welds nickel-zinc ferrite and oxygen-free copper under vacuum, be welded in the vacuum brazing stove and carry out (following examples are identical therewith), be warming up to welding temperature with 4 ℃/min heating rate: 320 ℃, insulation 10min naturally cools to room temperature then.
Sample after the welding is carried out the shearing experiment test, and the shear strength that test obtains is greater than 10Mpa; Scanning electron microscopic observation weld layer cross section pattern, nickel-zinc ferrite and scolder have reached good wetting effect; The fracture phenomena of weld layer is not found in room temperature to 200 ℃ thermal cycle 50 times.
The method makes nickel-zinc ferrite and oxygen-free copper substrate realize effective welding at 320 ℃, avoided because the too high ferrite that causes of brazing temperature ruptures and the deterioration of ferrite performance, thereby solved the problem that nickel Zn base ferrite absorber runs in preparation.
Embodiment 2
The welding method of a kind of nickel-zinc ferrite and oxygen-free copper substrate, this method is carried out according to the following steps:
(1) nickel-zinc ferrite is put into alcohol and carried out ultrasonic vibration cleaning 10min, clean the back and in 220 ℃ of baking ovens, dry 5h, the temperature of nickel-zinc ferrite is reduced to room temperature;
(2) adopt method for printing screen to apply the thick silver slurry of one deck 20 μ m equably on nickel-zinc ferrite, dry in 120 ℃ baking oven then, adopting after the oven dry uses the same method carries out the coating second time and dries handling;
(3) nickel-zinc ferrite of silver coating slurry in the step (2) is carried out the burning infiltration silver layer and make its metallization, the burning infiltration silver layer carries out in air atmosphere, heating rate with 0.6 ℃/min is warming up to 600 ℃, insulation 15min, cooldown rate with 1.0 ℃/min cools to 300 ℃, naturally cool to room temperature then, the transition region thickness that the metallization back forms is about 20 μ m;
(4) behind the silver layer polishing light and purified treatment with the Ni Zn ferrimagnet surface, used thickness is that (the quality percentage composition of Ag is 1% in the Sn-Ag alloy for the sheet Sn-1Ag alloy of 50 μ m, surplus is Sn) scolder welds nickel-zinc ferrite and oxygen-free copper under vacuum, be warming up to welding temperature with 4 ℃/min heating rate: 320 ℃, insulation 15min naturally cools to room temperature then.
Sample after the welding is carried out the shearing experiment test, and the shear strength that test obtains is greater than 10Mpa; Scanning electron microscopic observation weld layer cross section pattern, nickel-zinc ferrite and scolder have reached good wetting effect; The fracture phenomena of weld layer is not found in room temperature to 200 ℃ thermal cycle 50 times.
The method makes nickel-zinc ferrite and oxygen-free copper substrate realize effective welding at 320 ℃, avoided because the too high ferrite that causes of brazing temperature ruptures and the deterioration of ferrite performance, thereby solved the problem that nickel Zn base ferrite absorber runs in preparation.
Embodiment 3
The welding method of a kind of nickel-zinc ferrite and oxygen-free copper substrate, this method is carried out according to the following steps:
(1) nickel-zinc ferrite is put into alcohol and carried out ultrasonic vibration cleaning 10min, clean the back and in 220 ℃ of baking ovens, dry 5h, the temperature of nickel-zinc ferrite is reduced to room temperature;
(2) adopt method for printing screen to apply the thick silver slurry of one deck 20 μ m equably on nickel-zinc ferrite, dry in 120 ℃ baking oven then, adopting after the oven dry uses the same method carries out the coating second time and dries handling;
(3) nickel-zinc ferrite of silver coating slurry in the step (2) is carried out the burning infiltration silver layer and make its metallization, the burning infiltration silver layer carries out in air atmosphere, heating rate with 0.8 ℃/min is warming up to 520 ℃, insulation 12min, cooldown rate with 0.9 ℃/min cools to 280 ℃, naturally cool to room temperature then, the transition region thickness that the metallization back forms is about 20 μ m;
(4) behind the silver layer polishing light and purified treatment with the Ni Zn ferrimagnet surface, used thickness is that (the quality percentage composition of Ag is 3% in the Sn-Ag alloy for the sheet Sn-3Ag alloy of 50 μ m, surplus is Sn) scolder welds nickel-zinc ferrite and oxygen-free copper under vacuum, be warming up to welding temperature with 3 ℃/min heating rate: 310 ℃, insulation 12min naturally cools to room temperature then.
Sample after the welding is carried out the shearing experiment test, and the shear strength that test obtains is greater than 10Mpa; Scanning electron microscopic observation weld layer cross section pattern, nickel-zinc ferrite and scolder have reached good wetting effect; The fracture phenomena of weld layer is not found in room temperature to 200 ℃ thermal cycle 50 times.
The method makes nickel-zinc ferrite and oxygen-free copper substrate realize effective welding at 310 ℃, avoided because the too high ferrite that causes of brazing temperature ruptures and the deterioration of ferrite performance, thereby solved the problem that nickel Zn base ferrite absorber runs in preparation.
Embodiment 4
The welding method of a kind of nickel-zinc ferrite and oxygen-free copper substrate, this method is carried out according to the following steps:
(1) nickel-zinc ferrite is put into alcohol and carried out ultrasonic vibration cleaning 10min, clean the back and in 220 ℃ of baking ovens, dry 5h, the temperature of nickel-zinc ferrite is reduced to room temperature;
(2) adopt method for printing screen to apply the thick silver slurry of one deck 20 μ m equably on nickel-zinc ferrite, dry in 120 ℃ baking oven then, adopting after the oven dry uses the same method carries out the coating second time and dries handling;
(3) nickel-zinc ferrite of silver coating slurry in the step (2) is carried out the burning infiltration silver layer and make its metallization, the burning infiltration silver layer carries out in air atmosphere, heating rate with 0.8 ℃/min is warming up to 520 ℃, insulation 12min, cooldown rate with 0.9 ℃/min cools to 280 ℃, naturally cool to room temperature then, the transition region thickness that the metallization back forms is about 20 μ m;
(4) behind the silver layer polishing light and purified treatment with the Ni Zn ferrimagnet surface, used thickness is that (the quality percentage composition of Ag is 3% in the Sn-Ag alloy for the sheet Sn-3Ag alloy of 50 μ m, surplus is Sn) scolder welds nickel-zinc ferrite and oxygen-free copper under vacuum, be warming up to welding temperature with 3 ℃/min heating rate: 330 ℃, insulation 12min naturally cools to room temperature then.
Sample after the welding is carried out the shearing experiment test, and the shear strength that test obtains is greater than 10Mpa; Scanning electron microscopic observation weld layer cross section pattern, nickel-zinc ferrite and scolder have reached good wetting effect; The fracture phenomena of weld layer is not found in room temperature to 200 ℃ thermal cycle 50 times.
The method makes nickel-zinc ferrite and oxygen-free copper substrate realize effective welding at 330 ℃, avoided because the too high ferrite that causes of brazing temperature ruptures and the deterioration of ferrite performance, thereby solved the problem that nickel Zn base ferrite absorber runs in preparation.
Embodiment 5
The welding method of a kind of nickel-zinc ferrite and oxygen-free copper substrate, this method is carried out according to the following steps:
(1) nickel-zinc ferrite is put into alcohol and carried out ultrasonic vibration cleaning 10min, clean the back and in 220 ℃ of baking ovens, dry 5h, the temperature of nickel-zinc ferrite is reduced to room temperature;
(2) adopt method for printing screen on nickel-zinc ferrite, to apply the thick silver slurry of one deck 20 μ m equably;
(3) nickel-zinc ferrite of silver coating slurry in the step (2) is carried out the burning infiltration silver layer and make its metallization, the burning infiltration silver layer carries out in air atmosphere, heating rate with 0.6 ℃/min is warming up to 530 ℃, insulation 15min, cooldown rate with 1.0 ℃/min cools to 270 ℃, naturally cool to room temperature then, the transition region thickness that the metallization back forms is about 10 μ m;
(4) behind the silver layer polishing light and purified treatment with the Ni Zn ferrimagnet surface, used thickness is that (the quality percentage composition of Ag is 1% in the Sn-Ag alloy for the sheet Sn-1Ag alloy of 50 μ m, surplus is Sn) scolder welds nickel-zinc ferrite and oxygen-free copper under vacuum, be warming up to welding temperature with 4 ℃/min heating rate: 320 ℃, insulation 18min naturally cools to room temperature then.
Sample after the welding is carried out the shearing experiment test, and the shear strength that test obtains is greater than 10Mpa; Scanning electron microscopic observation weld layer cross section pattern, nickel-zinc ferrite and scolder have reached good wetting effect; The fracture phenomena of weld layer is not found in room temperature to 200 ℃ thermal cycle 50 times.
The method makes nickel-zinc ferrite and oxygen-free copper substrate realize effective welding at 320 ℃, avoided because the too high ferrite that causes of brazing temperature ruptures and the deterioration of ferrite performance, thereby solved the problem that nickel Zn base ferrite absorber runs in preparation.
Embodiment 6
The welding method of a kind of nickel-zinc ferrite and oxygen-free copper substrate, this method is carried out according to the following steps:
(1) nickel-zinc ferrite is put into alcohol and carried out ultrasonic vibration cleaning 10min, clean the back and in 220 ℃ of baking ovens, dry 5h, the temperature of nickel-zinc ferrite is reduced to room temperature;
(2) adopt method for printing screen on nickel-zinc ferrite, to apply the thick silver slurry of one deck 20 μ m equably;
(3) nickel-zinc ferrite of silver coating slurry in the step (2) is carried out the burning infiltration silver layer and make its metallization, the burning infiltration silver layer carries out in air atmosphere, heating rate with 0.6 ℃/min is warming up to 530 ℃, insulation 15min, cooldown rate with 1.0 ℃/min cools to 270 ℃, naturally cool to room temperature then, the transition region thickness that the metallization back forms is about 10 μ m;
(4) behind the silver layer polishing light and purified treatment with the Ni Zn ferrimagnet surface, used thickness is that (the quality percentage composition of Ag is 1% in the Sn-Ag alloy for the sheet Sn-1Ag alloy of 50 μ m, surplus is Sn) scolder welds nickel-zinc ferrite and oxygen-free copper under vacuum, be warming up to welding temperature with 4 ℃/min heating rate: 340 ℃, insulation 10min naturally cools to room temperature then.
Sample after the welding is carried out the shearing experiment test, and the shear strength that test obtains is greater than 10Mpa; Scanning electron microscopic observation weld layer cross section pattern, nickel-zinc ferrite and scolder have reached good wetting effect; The fracture phenomena of weld layer is not found in room temperature to 200 ℃ thermal cycle 50 times.
The method makes nickel-zinc ferrite and oxygen-free copper substrate realize effective welding at 340 ℃, avoided because the too high ferrite that causes of brazing temperature ruptures and the deterioration of ferrite performance, thereby solved the problem that nickel Zn base ferrite absorber runs in preparation.
Embodiment 7
The welding method of a kind of nickel-zinc ferrite and oxygen-free copper substrate, this method is carried out according to the following steps:
(1) nickel-zinc ferrite is put into alcohol and carried out ultrasonic vibration cleaning 10min, clean the back and in 220 ℃ of baking ovens, dry 5h, the temperature of nickel-zinc ferrite is reduced to room temperature;
(2) adopt method for printing screen on nickel-zinc ferrite, to apply the thick silver slurry of one deck 20 μ m equably;
(3) nickel-zinc ferrite of silver coating slurry in the step (2) is carried out the burning infiltration silver layer and make its metallization, the burning infiltration silver layer carries out in air atmosphere, heating rate with 0.6 ℃/min is warming up to 550 ℃, insulation 15min, cooldown rate with 1.0 ℃/min cools to 300 ℃, naturally cool to room temperature then, the transition region thickness that the metallization back forms is about 10 μ m;
(4) behind the silver layer polishing light and purified treatment with the Ni Zn ferrimagnet surface, used thickness is that (the quality percentage composition of Ag is 3% in the Sn-Ag alloy for the sheet Sn-3Ag alloy of 50 μ m, surplus is Sn) scolder welds nickel-zinc ferrite and oxygen-free copper under vacuum, be warming up to welding temperature with 4 ℃/min heating rate: 350 ℃, insulation 12min naturally cools to room temperature then.
Sample after the welding is carried out the shearing experiment test, and the shear strength that test obtains is greater than 10Mpa; Scanning electron microscopic observation weld layer cross section pattern, nickel-zinc ferrite and scolder have reached good wetting effect; The fracture phenomena of weld layer is not found in room temperature to 200 ℃ thermal cycle 50 times.
The method makes nickel-zinc ferrite and oxygen-free copper substrate realize effective welding at 350 ℃, avoided because the too high ferrite that causes of brazing temperature ruptures and the deterioration of ferrite performance, thereby solved the problem that nickel Zn base ferrite absorber runs in preparation.
Embodiment 8
The welding method of a kind of nickel-zinc ferrite and oxygen-free copper substrate, this method is carried out according to the following steps:
(1) nickel-zinc ferrite is put into alcohol and carried out ultrasonic vibration cleaning 10min, clean the back and in 220 ℃ of baking ovens, dry 5h, the temperature of nickel-zinc ferrite is reduced to room temperature;
(2) adopt method for printing screen on nickel-zinc ferrite, to apply the thick silver slurry of one deck 20 μ m equably;
(3) nickel-zinc ferrite of silver coating slurry in the step (2) is carried out the burning infiltration silver layer and make its metallization, the burning infiltration silver layer carries out in air atmosphere, heating rate with 0.6 ℃/min is warming up to 600 ℃, insulation 10min, cooldown rate with 1.0 ℃/min cools to 300 ℃, naturally cool to room temperature then, the transition region thickness that the metallization back forms is about 10 μ m;
(4) behind the silver layer polishing light and purified treatment with the Ni Zn ferrimagnet surface, used thickness is that (the quality percentage composition of Ag is 5% in the Sn-Ag alloy for the sheet Sn-5Ag alloy of 100 μ m, surplus is Sn) scolder welds nickel-zinc ferrite and oxygen-free copper under vacuum, be warming up to welding temperature with 5 ℃/min heating rate: 350 ℃, insulation 10min naturally cools to room temperature then.
Sample after the welding is carried out the shearing experiment test, and the shear strength that test obtains is greater than 10Mpa; Scanning electron microscopic observation weld layer cross section pattern, nickel-zinc ferrite and scolder have reached good wetting effect; The fracture phenomena of weld layer is not found in room temperature to 200 ℃ thermal cycle 50 times.
The method makes nickel-zinc ferrite and oxygen-free copper substrate realize effective welding at 350 ℃, avoided because the too high ferrite that causes of brazing temperature ruptures and the deterioration of ferrite performance, thereby solved the problem that nickel Zn base ferrite absorber runs in preparation.
Embodiment 9
The welding method of a kind of nickel-zinc ferrite and oxygen-free copper substrate, this method is carried out according to the following steps:
(1) nickel-zinc ferrite is put into alcohol and carried out ultrasonic vibration cleaning 10min, clean the back and in 220 ℃ of baking ovens, dry 5h, the temperature of nickel-zinc ferrite is reduced to room temperature;
(2) adopt method for printing screen on nickel-zinc ferrite, to apply the thick silver slurry of one deck 20 μ m equably;
(3) nickel-zinc ferrite of silver coating slurry in the step (2) is carried out the burning infiltration silver layer and make its metallization, the burning infiltration silver layer carries out in air atmosphere, heating rate with 0.8 ℃/min is warming up to 590 ℃, insulation 13min, cooldown rate with 0.7 ℃/min cools to 260 ℃, naturally cool to room temperature then, the transition region thickness that the metallization back forms is about 10 μ m;
(4) behind the silver layer polishing light and purified treatment with the Ni Zn ferrimagnet surface, used thickness is that (the quality percentage composition of Ag is 7% in the Sn-Ag alloy for the sheet Sn-7Ag alloy of 100 μ m, surplus is Sn) scolder welds nickel-zinc ferrite and oxygen-free copper under vacuum, be warming up to welding temperature with 4 ℃/min heating rate: 350 ℃, insulation 14min naturally cools to room temperature then.
Sample after the welding is carried out the shearing experiment test, and the shear strength that test obtains is greater than 10Mpa; Scanning electron microscopic observation weld layer cross section pattern, nickel-zinc ferrite and scolder have reached good wetting effect; The fracture phenomena of weld layer is not found in room temperature to 200 ℃ thermal cycle 50 times.
The method makes nickel-zinc ferrite and oxygen-free copper substrate realize effective welding at 350 ℃, avoided because the too high ferrite that causes of brazing temperature ruptures and the deterioration of ferrite performance, thereby solved the problem that nickel Zn base ferrite absorber runs in preparation.
Embodiment 10
The welding method of a kind of nickel-zinc ferrite and oxygen-free copper substrate, this method is carried out according to the following steps:
(1) nickel-zinc ferrite is put into alcohol and carried out ultrasonic vibration cleaning 10min, clean the back and in 220 ℃ of baking ovens, dry 5h, the temperature of nickel-zinc ferrite is reduced to room temperature;
(2) adopt method for printing screen on nickel-zinc ferrite, to apply the thick silver slurry of one deck 20 μ m equably;
(3) nickel-zinc ferrite of silver coating slurry in the step (2) is carried out the burning infiltration silver layer and make its metallization, the burning infiltration silver layer carries out in air atmosphere, heating rate with 0.6 ℃/min is warming up to 570 ℃, insulation 15min, cooldown rate with 1.0 ℃/min cools to 260 ℃, naturally cool to room temperature then, the transition region thickness that the metallization back forms is about 10 μ m;
(4) behind the silver layer polishing light and purified treatment with the Ni Zn ferrimagnet surface, used thickness is that (the quality percentage composition of Ag is 10% in the Sn-Ag alloy for the sheet Sn-10Ag alloy of 100 μ m, surplus is Sn) scolder welds nickel-zinc ferrite and oxygen-free copper under vacuum, be warming up to welding temperature with 4 ℃/min heating rate: 380 ℃, insulation 16min naturally cools to room temperature then.
Sample after the welding is carried out the shearing experiment test, and the shear strength that test obtains is greater than 10Mpa; Scanning electron microscopic observation weld layer cross section pattern, nickel-zinc ferrite and scolder have reached good wetting effect; The fracture phenomena of weld layer is not found in room temperature to 200 ℃ thermal cycle 50 times.
The method makes nickel-zinc ferrite and oxygen-free copper substrate realize effective welding at 380 ℃, avoided because the too high ferrite that causes of brazing temperature ruptures and the deterioration of ferrite performance, thereby solved the problem that nickel Zn base ferrite absorber runs in preparation.
Embodiment 11
The welding method of a kind of nickel-zinc ferrite and oxygen-free copper substrate, this method is carried out according to the following steps:
(1) nickel-zinc ferrite is put into alcohol and carried out ultrasonic vibration cleaning 10min, clean the back and in 220 ℃ of baking ovens, dry 5h, the temperature of nickel-zinc ferrite is reduced to room temperature;
(2) adopt method for printing screen on nickel-zinc ferrite, to apply the thick silver slurry of one deck 20 μ m equably;
(3) nickel-zinc ferrite of silver coating slurry in the step (2) is carried out the burning infiltration silver layer and make its metallization, the burning infiltration silver layer carries out in air atmosphere, heating rate with 0.9 ℃/min is warming up to 560 ℃, insulation 10min, cooldown rate with 0.6 ℃/min cools to 250 ℃, naturally cool to room temperature then, the transition region thickness that the metallization back forms is about 10 μ m;
(4) behind the silver layer polishing light and purified treatment with the Ni Zn ferrimagnet surface, used thickness is that (the quality percentage composition of Ag is 7% in the Sn-Ag alloy for the sheet Sn-7Ag alloy of 50 μ m, surplus is Sn) scolder welds nickel-zinc ferrite and oxygen-free copper under vacuum, be warming up to welding temperature with 4 ℃/min heating rate: 380 ℃, insulation 10min naturally cools to room temperature then.
Sample after the welding is carried out the shearing experiment test, and the shear strength that test obtains is greater than 10Mpa; Scanning electron microscopic observation weld layer cross section pattern, nickel-zinc ferrite and scolder have reached good wetting effect; The fracture phenomena of weld layer is not all found in room temperature to 200 ℃ thermal cycle 50 times.
The method makes nickel-zinc ferrite and oxygen-free copper substrate realize effective welding at 380 ℃, avoided because the too high ferrite that causes of brazing temperature ruptures and the deterioration of ferrite performance, thereby solved the problem that nickel Zn base ferrite absorber runs in preparation.
In sum, adopt above-mentioned experimental program all can make nickel-zinc ferrite and oxygen-free copper substrate realize effective welding at low temperatures, shearing experiment is tested its shear strength greater than 10Mpa; Nickel-zinc ferrite and scolder have reached good wetting effect; Room temperature to 200 ℃ thermal cycle 50 times is not found the fracture phenomena of weld layer to have solved the problem that nickel Zn base ferrite absorber runs in preparation.This low-temperature welding method can expand in other ferrite and oxygen-free copper or the stainless welding application, makes it obtain using value more widely.
Claims (7)
1, the welding method of a kind of nickel-zinc ferrite and oxygen-free copper substrate is characterized in that, this method is carried out according to the following steps:
(1) cleans nickel-zinc ferrite, clean the back and in 200-250 ℃ of baking oven, dry, reduce to room temperature;
(2) adopt method for printing screen on nickel-zinc ferrite, to apply the silver slurry that a layer thickness is 20-40 μ m equably, in 100-150 ℃ of baking oven, dry then;
(3) nickel-zinc ferrite of silver coating slurry in the step (2) is carried out the burning infiltration silver layer and make its metallization, the burning infiltration silver layer carries out in air atmosphere, be warming up to 500-600 ℃, insulation 5-90min, cooldown rate with 0.5-1.0 ℃/min cools to 250-300 ℃, naturally cool to room temperature then, the transition region thickness after the metallization is 10-20 μ m;
(4) behind the silver layer polishing light and purified treatment with the Ni Zn ferrimagnet surface, use the Sn-Ag solder that nickel-zinc ferrite and oxygen-free copper are welded under vacuum, be warming up to welding temperature: 300-380 ℃, insulation 5-90min naturally cools to room temperature then.
2, the welding method of a kind of nickel-zinc ferrite according to claim 1 and oxygen-free copper substrate is characterized in that, cleans described in the step (1) to nickel-zinc ferrite being put into alcohol and carries out the ultrasonic vibration cleaning.
3, the welding method of a kind of nickel-zinc ferrite according to claim 1 and oxygen-free copper substrate is characterized in that, described step (2) repetitive operation is repeatedly carried out repeatedly coating and oven dry processing.
4, the welding method of a kind of nickel-zinc ferrite according to claim 1 and oxygen-free copper substrate is characterized in that, the quality percentage composition of Ag is 1-10% in the described Sn-Ag alloy, and surplus is Sn.
5, the welding method of a kind of nickel-zinc ferrite according to claim 1 and oxygen-free copper substrate is characterized in that, described Sn-Ag solder is a sheet, and thickness is 50-100 μ m.
6, the welding method of a kind of nickel-zinc ferrite according to claim 1 and oxygen-free copper substrate is characterized in that, heating rate is 0.5-1.0 ℃/min described in the step (3).
7, the welding method of a kind of nickel-zinc ferrite according to claim 1 and oxygen-free copper substrate is characterized in that, heating rate is 3-5 ℃/min described in the step (4).
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