CN102486655A - Ferrite absorber for absorbing high order mode in high-frequency cavity and manufacturing method thereof - Google Patents
Ferrite absorber for absorbing high order mode in high-frequency cavity and manufacturing method thereof Download PDFInfo
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- CN102486655A CN102486655A CN2010105808045A CN201010580804A CN102486655A CN 102486655 A CN102486655 A CN 102486655A CN 2010105808045 A CN2010105808045 A CN 2010105808045A CN 201010580804 A CN201010580804 A CN 201010580804A CN 102486655 A CN102486655 A CN 102486655A
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Abstract
The invention provides a ferrite absorber for absorbing a high order mode in a high-frequency cavity and a manufacturing method thereof. An adopted material system is Ni-Zn-Co spinel (S) type ferrite the molecule chemical formula of which is NixZn[1-x-y]CoyFe2O4, wherein x is 0.40-0.80, and y is 0.04-0.20. The batch manufacturing of ferrite powder is carried out by using a power solid-state reaction method or a pipeline type synthetic chemical co-precipitation method; a ferrite cylinder-shaped blank is manufactured by using a normal pressing-sintering method; a ferrite block material is processed by using a finishing and cutting process; a silver layer is metalized by using silver paste screen printing and a subsequent sintering and permeating process of the silver paste; and the ferrite block material is brazed with the cavity body of the high-frequency cavity by adopting a flaky Sn-Ag alloy brazing flux. According to the invention, the wave-absorbing property of the ferrite absorber in a frequency band of 470MHZ-1090MHZ is achieved; and simultaneously, low brazing temperature is adopted, so as to avoid the variation of chemical components in the ferrite due to over-high brazing temperature and reductive atmosphere and effectively prevent the deterioration of the property of the ferrite in the brazing process; and the ferrite absorber is applied to the high-frequency cavity of a particle accelerator so as to deeply restrict the high order mode field and improve the stability of beam current in the cavity.
Description
Technical field
The present invention relates to a kind of ferrite absorber that is used for absorbing high-frequency chamber higher mode and preparation method thereof, the preparation method of this absorber comprises and adopts powder metallurgic method to prepare ferrite block and this bulk is welded in the frequency cavity cavity (matrix is an oxygen-free copper).
Background technology
The strong accelerator of big stream as CESR, KEKB and BEPC II is along with strong the improving constantly of stream; The higher mode field that line evokes in frequency cavity also will increase; If not in addition fully attenuation by absorption then can influence the stable of line, even cause the line vibration to lose.Overcome one of way; Be on the beam current tube of frequency cavity, to install to adhere to ferrite wideband high-frequency absorbing material; The higher mode power attenuation that will be coupled out in the chamber absorbs; Convert heat energy immediately to, through the cooling water system of cavity heat is taken away at last, thereby reach the purpose of higher mode in the absorbing cavity.
Summary of the invention
The object of the present invention is to provide a kind of ferrite absorber that is used for absorbing high-frequency chamber higher mode and preparation method thereof, the ferrite absorber that is used for absorbing high-frequency chamber higher mode of the present invention can have good absorbing property in 470MHZ～1090MHz frequency range; Its preparation method can effectively prevent the deterioration of ferrite performance in welding process, has solved the problem that the ferrite absorber runs in preparation.
For realizing above-mentioned purpose, the present invention takes following technical scheme:
A kind of ferrite absorber that is used for absorbing high-frequency chamber higher mode is the circular-arc ferrite block that the face of weld burning infiltration has silver layer in the absorber cavity, and the material molecule chemical formula of this ferrite block is: Ni
xZn
1-x-yCo
yFe
2O
4, wherein x is 0.40～0.80, y is 0.04～0.20.
A kind of preparation method who is used for the ferrite absorber of absorbing high-frequency chamber higher mode, this method comprises the steps:
(1), the ferrite powder of preparation below 200 orders, the material molecule chemical formula of this ferrite powder is: Ni
xZn
1-x-yCo
yFe
2O
4, wherein x is 0.40～0.80, y is 0.04～0.20;
(2), adopt 4～8wt%PVA WS as binder, press ferrite powder: forming agent=95～105: 5～10 part by weight is mixed and granulation, and is pressed into the tubular base substrate;
(3), be in the atmosphere at oxidizing atmosphere, the tubular base substrate oven dry that under 350～550 ℃ of conditions, step (2) is obtained is deviate from binder; And continuation sintering under 1200～1350 ℃ of conditions;
(4), the tubular base substrate behind the sintering is carried out the back processed, process the circular-arc ferrite block of the processing that meets the demands;
(5), the thick silver of coating one deck 20～40 μ m is starched on ferrite block, through sintering, makes the surperficial burning infiltration of ferrite block that silver layer arranged;
(6), there is the circular-arc ferrite block assembly unit of silver layer to be welded in the frequency cavity cavity surperficial burning infiltration; And be covered with whole tubular cavity, welding employed scolder is the Sn-Ag solder, wherein; The quality percentage composition of Ag is 1～10% in the Sn-Ag solder, and surplus is Sn; Welding atmosphere is a vacuum, promptly obtains being used for the ferrite absorber of absorbing high-frequency chamber higher mode after the welding.
The ferrite powder for preparing below 200 orders can adopt powder solid state reaction or these two kinds of method prepared in batches ferrite powders of duct type synthetic chemistry coprecipitation.
Wherein, adopt the powder solid state reaction to prepare ferrite powder:
In the ferrite powder process below preparation 200 orders in step (1), be greater than 99.9% Fe with purity
2O
3, NiO, ZnO and CoO powder, form and stoichiometric proportion takes by weighing required material feedstock according to above-mentioned material molecular chemistry formula; The material feedstock that takes by weighing is carried out Ball milling and mixing, behind the ball milling, mixed-powder is sieved with 200 eye mesh screens; Powder after will sieving is again put into muffle furnace in 900 ℃～1000 ℃ presintering 1～3h; Then presintering powder is handled 3～5h in the ball mill mixing machine and carry out the ball milling second time, powder sieves with 200 eye mesh screens once more behind the ball milling, promptly obtains the ferrite powder below 200 orders.
Adopt duct type synthetic chemistry coprecipitation to prepare ferrite powder:
In the ferrite powder process below preparation 200 orders in step (1), be to contain FeSO according to above-mentioned material molecular chemistry formula composition and stoichiometric proportion preparation
4, ZnCl
2, NiCl
2And CoCl
2Reaction mother liquor, wherein the total concentration of metal ions in the reaction mother liquor is 1～5mol/L, and prepares the NH of 15～20wt% respectively
3H
2The NaOH solution of O solution and 15～25wt% is then according to NH
4+With the mol ratio of total metallic ion in the reaction mother liquor be 1～3: 1 ratio, in agitated reactor, add and contain FeSO
4, ZnCl
2, NiCl
2And CoCl
2Reaction mother liquor and NH
3H
2O solution, the pH of adding NaOH solution control reaction is 10～12 in agitated reactor simultaneously, temperature of reaction is 60 ℃～80 ℃, and is after reaction finishes that lower floor's deposit liquid is extremely neutral with deionized water wash; Obtain reactant after the oven dry, then reactant is used the mortar dispersion treatment, and, the powder after the screening is put into muffle furnace in 700～800 ℃ of presintering 1～3h with the screening of 200 eye mesh screens; Again presintering powder is handled 3～5h in the ball mill mixing machine and carry out the ball milling second time, powder sieves with 200 eye mesh screens once more behind the ball milling, promptly obtains the ferrite powder below 200 orders.
In the preparation method who is used for the ferrite absorber of absorbing high-frequency chamber higher mode of the present invention, in described step (2), the potpourri with ferrite powder and forming agent before granulation toasts 1～3h at 50～90 ℃.
In described step (3), in the oven dry of ferrite base substrate, it is in the atmosphere at oxidizing atmosphere earlier before that binder is deviate from, more than baking 72h under 100～150 ℃ of conditions.
In the preparation method who is used for the ferrite absorber of absorbing high-frequency chamber higher mode of the present invention, in described step (3), be speed intensification to be lower than 1 ℃/minute, be warmed up to 350～550 ℃, and be incubated 5～8 hours.
In the preparation method who is used for the ferrite absorber of absorbing high-frequency chamber higher mode of the present invention; In described step (3), be to heat up from 350～550 ℃ to be lower than 0.5 ℃ of/minute speed, 40 ℃ of insulations of every intensification 10～20 minutes; Be raised to 1200～1350 ℃, be incubated 2～5 hours; Afterwards, in the cooling rate cooling that is lower than 1 ℃/minute, 50 ℃ of insulations of every cooling 10～20 minutes are cooled to room temperature until the ferrite tubular base substrate of sintering.
In the preparation method who is used for the ferrite absorber of absorbing high-frequency chamber higher mode of the present invention, in described step (5), the ferrite block that applies silver slurry layer is in sintering process; Be in the intermediate sintering temperature stove, to carry out sintering; Sintering atmosphere is an air, is that the heating rate with 0.5～1.0 ℃/min is warming up to 550～750 ℃, insulation 10～30min; Then the cooldown rate with 0.5～1.0 ℃/min is cooled to 200～400 ℃, naturally cools to room temperature then.
In the preparation method who is used for the ferrite absorber of absorbing high-frequency chamber higher mode of the present invention; In described step (6); When the ferrite block assembly unit is welded in the frequency cavity cavity; Be warming up to 300～400 ℃ with 3～5 ℃/min heating rate, insulation 10～50min naturally cools to room temperature then.
The present invention has following characteristics:
1, passes through Ni
xZn
1-x-yCo
yFe
2O
4Ferrite Material composition and technology are adjusted, and can realize the absorbing property of ferrite absorber in 470MHZ～1090MHz frequency range preferably.
2, select lower welding temperature for use; Avoided because the variation of the ferrite stoichiometric composition that brazing temperature is too high and reducing atmosphere causes; Can effectively prevent the deterioration of ferrite performance in welding process, solved the problem that the ferrite absorber runs in preparation.This ferrite absorber is applied to but the degree of depth suppresses the higher mode field in the frequency cavity of particle accelerator, improves the stability of line in the chamber.
Description of drawings
Fig. 1 is to not adding and add the S of ferrite absorber of the present invention
21The absorbing property test result that parameter is measured.
Fig. 2 is to not adding and add the S of ferrite absorber of the present invention
21The absorbing property repeated test result contrast that parameter is measured.
Fig. 3 is the front view (section) and the side view of ferrite absorber.
Embodiment
The material system that the present invention adopts is Ni-Zn-Co spinel (S) type ferrite, and the molecular chemistry formula of this material is: Ni
xZn
1-x-yCo
yFe
2O
4, wherein x is 0.40～0.80, y is 0.04～0.20.Adopt powder solid state reaction or duct type synthetic chemistry coprecipitation to carry out the prepared in batches of ferrite powder.Technological parameters such as purity, granularity, mixing uniformity and reaction-sintered temperature through reasonable control native oxide powder guarantee that the powder solid state reaction prepares the performance of ferrite powder; Through to control of process parameters such as concentration, pH value, temperature of reaction, sintering temperatures, guarantee the stable of prepared in batches ferrite powder performance.Adopt conventional compacting-sintering process to prepare ferrite tubular blank,, guarantee that the ferrite blank of preparation satisfies certain mechanical property and dimensional requirement through the research that selection, pressing process, the binder of binder deviate from technology and sintering process.Adopt the preparation of correct grinding and cutting technique to satisfy the ferrite block of request for utilization shown in Figure 3.Adopt method for printing screen to apply one deck silver slurry equably at the ferrite block outside surface; Burning infiltration silver slurry makes its metallization then, guarantees that through controlling technological parameters such as the silver-colored thickness of starching, sintering temperature, heating rate silver layer is securely attached to the ferrite block outside surface.Adopt sheet Sn-Ag solder that ferrite block and frequency cavity cavity are welded, guarantee that through technological parameters such as control welding temperature, heating rate, welding atmospheres the weld strength of ferrite block and frequency cavity cavity satisfies the request for utilization of ferrite absorber.
The prepared ferrite absorber that is used for absorbing high-frequency chamber higher mode is as shown in Figure 3, and this ferrite absorber is the circular-arc ferrite block 2 that the face of weld burning infiltration has silver layer in frequency cavity cavity 1.
Executing case below in conjunction with instance is described further the present invention:
Case study on implementation 1:
Adopt powder solid state reaction of the present invention to prepare ferrite powder, this ferrite powder is that the molecular chemistry formula is Ni
0.4Zn
0.4Co
0.2Fe
2O
4Ferrite powder.Wherein, take by weighing 3194.0g Fe respectively
2O
3, 597.6g NiO, 651.0g ZnO and 299.7g CoO starting powder are with obtaining mixed-powder 4740g after starting powder ball mill mixing and the screening.Powder after the screening is put into muffle furnace in 950 ℃ of presintering 2h.Accomplish the preparation of ferrite absorber then according to the subsequent step in the technical scheme of the present invention (2)～(6).Wherein, sintered powder is handled 4h in the ball mill mixing machine and carry out the ball milling second time; Adopt the 5wt%PVA WS as binder; By ferrite powder: the granulation that is mixed of the part by weight of forming agent=100: 5, and be pressed into tubular ferrite base substrate; Speed with 0.8 ℃/minute in air heats up, and binder is deviate from 5 hours 500 ℃ of insulations; Under 0.4 ℃/minute programming rate, 40 ℃ of insulations of every intensification 15 minutes, the highest sintering temperature is 1250 ℃, soak 4 hours.Under 0.5 ℃/minute cooling rate, 50 ℃ of insulations of every cooling 20 minutes are cooled to room temperature until sintered sample; The ferrite block external surface crossed of processed applies the thick silver slurry layer of one deck 20 μ m equably in the back, and the burning infiltration silver layer is warming up to 550 ℃ with the heating rate of 0.5 ℃/min, and insulation 10min is cooled to 200 ℃ with the cooldown rate of 1.0 ℃/min; The quality percentage composition that adopts Ag during welding is 2% scolder, is warming up to 300 ℃ with 3 ℃/min heating rate during welding, and insulation 20min naturally cools to room temperature then, has promptly obtained being used for the ferrite absorber of absorbing high-frequency chamber higher mode.
Adopt above-mentioned technology to realize effective welding of ferrite and frequency cavity cavity, the fracture phenomena of weld layer is not found in room temperature to 200 ℃ thermal cycle 50 times, and its weld strength has satisfied the request for utilization of absorber.
Case study on implementation 2:
Adopt powder solid state reaction of the present invention to prepare ferrite powder, this ferrite powder is that the molecular chemistry formula is Ni
0.6Zn
0.3Co
0.1Fe
2O
4Ferrite powder.Wherein, take by weighing 3194.0gFe respectively
2O
3, 896.4g NiO, 488.3g ZnO and 149.9g CoO starting powder are with obtaining mixed-powder 4725g after starting powder ball mill mixing and the screening.Powder after the screening is put into muffle furnace in 900 ℃ of presintering 2h.Accomplish the preparation of ferrite absorber then according to the step in the technical scheme of the present invention (2)～(6).Wherein, sintered powder is handled 5h in the ball mill mixing machine and carry out the ball milling second time; Adopt the 6wt%PVA WS as binder; By ferrite powder: the granulation that is mixed of the part by weight of forming agent=105: 10, and be pressed into tubular ferrite base substrate; Speed with 0.5 ℃/minute in air heats up, and binder is deviate from 4 hours 400 ℃ of insulations; Under 0.3 ℃/minute programming rate, 40 ℃ of insulations of every intensification 20 minutes, the highest sintering temperature is 1300 ℃, soak 5 hours.Under 0.8 ℃/minute cooling rate, 50 ℃ of insulations of every cooling 20 minutes are cooled to room temperature until sintered sample; The ferrite block external surface crossed of processed applies the thick silver slurry layer of one deck 30 μ m equably in the back, and the burning infiltration silver layer is warming up to 600 ℃ with the heating rate of 1.0 ℃/min, and insulation 20min is cooled to 300 ℃ with the cooldown rate of 1.0 ℃/min; The quality percentage composition that adopts Ag during welding is 5% scolder, is warming up to 350 ℃ with 4 ℃/min heating rate during welding, and insulation 10min naturally cools to room temperature then, promptly obtains being used for the ferrite absorber of absorbing high-frequency chamber higher mode.
Adopt above-mentioned technology to realize effective welding of ferrite and frequency cavity cavity, the fracture phenomena of weld layer is not found in room temperature to 200 ℃ thermal cycle 50 times, and its weld strength has satisfied the request for utilization of absorber.
Case study on implementation 3:
Adopt duct type synthetic chemistry coprecipitation to prepare ferrite powder, this ferrite powder is that the molecular chemistry formula is Ni
0.8Zn
0.16Co
0.04Fe
2O
4Ferrite powder.Wherein, the preparing metal ion concentration is the reaction mother liquor 4.0L of 1.5mol/L, the NH of 15wt% respectively
3H
2The about 1.0mL of NaOH solution of O solution 2.8L and 15wt% prepares pH and is 10 reactant liquor then, is heated to 60 ℃; According to NH
4 +With the mol ratio of metallic ion be that 2: 1 ratio is controlled metallic ion reaction mother liquor and NH respectively
3H
2The O flow is regulated the NaOH flow simultaneously, and the pH of control reaction is about 10, and reaction finishes back NaOH solution usage and is approximately about 0.2mL; Under 150 ℃ of temperature,, obtain about ferrite powder 450g reactant flash baking.According to preparing ferrite powder with quadrat method 10 times, obtain the ferrite powder total amount and be about 4500g.Powder after the screening is put into muffle furnace in 700 ℃ of presintering 2h.Accomplish the preparation of ferrite absorber then according to the step in the technical scheme of the present invention (2)～(6).Wherein, sintered powder is handled 3h in the ball mill mixing machine and carry out the ball milling second time; Adopt the 8wt%PVA WS as binder; By ferrite powder: the granulation that is mixed of the part by weight of forming agent=100: 10; Speed with 0.5 ℃/minute in air heats up, and binder is deviate from 4 hours 550 ℃ of insulations; Under 0.3 ℃/minute programming rate, 40 ℃ of insulations of every intensification 20 minutes, the highest sintering temperature is 1250 ℃, soak 5 hours.Under 0.8 ℃/minute cooling rate, 50 ℃ of insulations of every cooling 20 minutes are cooled to room temperature until sintered sample; The ferrite block external surface crossed of processed applies the thick silver slurry layer of one deck 40 μ m equably in the back, and the burning infiltration silver layer is warming up to 620 ℃ with the heating rate of 1.0 ℃/min, and insulation 20min is cooled to 300 ℃ with the cooldown rate of 1.0 ℃/min; The quality percentage composition that adopts Ag during welding is 8% scolder, is warming up to 380 ℃ with 4 ℃/min heating rate during welding, and insulation 10min naturally cools to room temperature then, promptly obtains being used for the ferrite absorber of absorbing high-frequency chamber higher mode.
Adopt above-mentioned technology to realize effective welding of ferrite and frequency cavity cavity, the fracture phenomena of weld layer is not found in room temperature to 200 ℃ thermal cycle 50 times, and its weld strength has satisfied the request for utilization of absorber.
Case study on implementation 4:
Adopt duct type synthetic chemistry coprecipitation to prepare ferrite powder, this ferrite powder is that the molecular chemistry formula is Ni
0.8Zn
0.1Co
0.1Fe
2O
4Ferrite powder.Wherein, the preparing metal ion concentration is the reaction mother liquor 2.0L of 3.0mol/L, the NH of 20wt% respectively
3H
2The about 10mL of NaOH solution of O solution 2.1L and 20wt% prepares pH and is 12 reactant liquor then, is heated to 60 ℃; According to NH
4 +With the mol ratio of metallic ion be that 3: 1 ratio is controlled metallic ion reaction mother liquor and NH respectively
3H
2The O flow is regulated the NaOH flow simultaneously, and the pH of control reaction is about 12, and reaction finishes back NaOH solution usage and is approximately about 8mL; Under 150 ℃ of temperature,, obtain about ferrite powder 450g reactant flash baking.According to preparing ferrite powder with quadrat method 10 times, obtain the ferrite powder total amount and be about 4500g.Powder after the screening is put into muffle furnace in 800 ℃ of presintering 2h.Accomplish the preparation of ferrite absorber then according to the step in the technical scheme of the present invention (2)～(6).Wherein, sintered powder is handled 3h in the ball mill mixing machine and carry out the ball milling second time; Adopt the 5wt%PVA WS as binder; By ferrite powder: the granulation that is mixed of the part by weight of forming agent=100: 5; Speed with 0.5 ℃/minute in air heats up, and binder is deviate from 4 hours 500 ℃ of insulations; Under 0.3 ℃/minute programming rate, 40 ℃ of insulations of every intensification 20 minutes, the highest sintering temperature is 1300 ℃, soak 5 hours.Under 0.5 ℃/minute cooling rate, 50 ℃ of insulations of every cooling 20 minutes are cooled to room temperature until sintered sample; The ferrite block external surface crossed of processed applies the thick silver slurry layer of one deck 40 μ m equably in the back, and the burning infiltration silver layer is warming up to 650 ℃ with the heating rate of 1.0 ℃/min, and insulation 20min is cooled to 300 ℃ with the cooldown rate of 1.0 ℃/min; The quality percentage composition that adopts Ag during welding is 2% scolder, is warming up to 300 ℃ with 4 ℃/min heating rate during welding, and insulation 10min naturally cools to room temperature then, promptly obtains being used for the ferrite absorber of absorbing high-frequency chamber higher mode.
Adopt above-mentioned technology to realize effective welding of ferrite and frequency cavity cavity, the fracture phenomena of weld layer is not found in room temperature to 200 ℃ thermal cycle 50 times, and its weld strength has satisfied the request for utilization of absorber.
Case study on implementation 5:
For the molecular chemistry formula is Ni
xZn
1-x-yCo
yFe
2O
4The ferrite composition; Wherein the variation range of Ni content x is 0.40～0.80, and the variation range of Co content y is 0.04～0.20, selects a certain immobilization material composition in this scope; Adopt duct type synthetic chemistry coprecipitation to prepare ferrite powder; And prepare the ferrite absorber by the step in the technical scheme of the present invention, and the ferrite absorber has been carried out the test of absorbing property, test result is following:
Respectively to not adding and add the S of ferrite absorber
21Parameter is measured, and respectively has two secondary data more approaching, gets that wherein one group of data is as shown in Figure 1: S
21_ Damper is for adding the S that the ferrite absorber records
212. the curve of parameter (is arranged in the nethermost curve of Fig. 1); S
21The S that _ NoDamper recorded for added-time not
211. the curve of parameter (is arranged in the curve of the centre of Fig. 1); Curve is S 3.
21_ Damper-S
21_ NoDamper is both poor (being arranged in the uppermost curve of Fig. 1), the i.e. absorbing property of Ferrite Material.
Twice raw data is as shown in Figure 2, and the name of sequence is identical with the implication of Fig. 1, and sequence number 1,2 is behind the name represented respectively for the first time and the data that measure for the second time.Can see that from Fig. 2 twice measurement has better repeatability, the nethermost curve that promptly is arranged in Fig. 2 2.-S
21_ Damper1 and curve are 2. '-S
21_ Damper2 has better repeatability; Be arranged in Fig. 2 the centre curve 1.-S
21_ NoDamper1 and curve are 1. '-S
21_ NoDamper2 has better repeatability; Show that the absorbing property test result is accurately and reliably.The uppermost curve that is arranged in Fig. 2 3.-S
21_ Damper-S
21_ NoDamper is poor for both, i.e. the absorbing property of Ferrite Material.
Shown in Fig. 1 and Fig. 2 test result, the absorbing property of absorber between 470MHZ～1090MHz all＜-4dB, the maximal value of absorbing property appears at 770MHz, is-4.47dB.Absorber at the absorbing property of 1030MHz is-4.05dB (Japan for-3.97dB), be better than the absorbing property of Japanese like product.Therefore, this ferrite absorber is applied to effectively to absorb on the large aperture beam current tube of frequency cavity the higher mode power that is coupled out in the chamber, improves the quality of beam of accelerator electron beam.
Claims (10)
1. ferrite absorber that is used for absorbing high-frequency chamber higher mode, it is characterized in that: be the circular-arc ferrite block that the face of weld burning infiltration has silver layer in the absorber cavity, the material molecule chemical formula of this ferrite block is: Ni
xZn
1-x-yCo
yFe
2O
4, wherein x is 0.40～0.80, y is 0.04～0.20.
2. preparation method who is used for the ferrite absorber of absorbing high-frequency chamber higher mode, it is characterized in that: this method comprises the steps:
(1), the ferrite powder of preparation below 200 orders, the material molecule chemical formula of this ferrite powder is: Ni
xZn
1-x-yCo
yFe
2O
4, wherein x is 0.40～0.80, y is 0.04～0.20;
(2), adopt 4～8wt%PVA WS as binder, press ferrite powder: forming agent=95～105: 5～10 part by weight is mixed and granulation, and is pressed into the tubular base substrate;
(3), be in the atmosphere at oxidizing atmosphere, the tubular base substrate oven dry that under 350～550 ℃ of conditions, step (2) is obtained is deviate from binder; And continuation sintering under 1200～1350 ℃ of conditions;
(4), the tubular base substrate behind the sintering is carried out the back processed, process circular-arc ferrite block;
(5), the thick silver of coating one deck 20～40 μ m is starched on ferrite block, through sintering, makes the surperficial burning infiltration of ferrite block that silver layer arranged;
(6), there is the circular-arc ferrite block assembly unit of silver layer to be welded in the frequency cavity cavity surperficial burning infiltration; And be covered with whole tubular cavity, welding employed scolder is the Sn-Ag solder, wherein; The quality percentage composition of Ag is 1～10% in the Sn-Ag solder, and surplus is Sn; Welding atmosphere is a vacuum, promptly obtains being used for the ferrite absorber of absorbing high-frequency chamber higher mode after the welding.
3. the preparation method who is used for the ferrite absorber of absorbing high-frequency chamber higher mode according to claim 2 is characterized in that:
In the ferrite powder process below preparation 200 orders in step (1), be greater than 99.9% Fe with purity
2O
3, NiO, ZnO and CoO powder, form and stoichiometric proportion takes by weighing required material feedstock according to above-mentioned material molecular chemistry formula; The material feedstock that takes by weighing is carried out Ball milling and mixing, behind the ball milling, mixed-powder is sieved with 200 eye mesh screens; Powder after will sieving is again put into muffle furnace in 900 ℃～1000 ℃ presintering 1～3h; Then presintering powder is handled 3～5h in the ball mill mixing machine and carry out the ball milling second time, powder sieves with 200 eye mesh screens once more behind the ball milling, promptly obtains the ferrite powder below 200 orders.
4. the preparation method who is used for the ferrite absorber of absorbing high-frequency chamber higher mode according to claim 2 is characterized in that:
In the ferrite powder process below preparation 200 orders in step (1), be to contain FeSO according to above-mentioned material molecular chemistry formula composition and stoichiometric proportion preparation
4, ZnCl
2, NiCl
2And CoCl
2Reaction mother liquor, wherein the total concentration of metal ions in the reaction mother liquor is 1～5mol/L, and prepares the NH of 15～20wt% respectively
3H
2The NaOH solution of O solution and 15～25wt% is then according to NH
4+With the mol ratio of total metallic ion in the reaction mother liquor be 1～3: 1 ratio, in agitated reactor, add and contain FeSO
4, ZnCl
2, NiCl
2And CoCl
2Reaction mother liquor and NH
3H
2O solution, the pH of adding NaOH solution control reaction is 10～12 in agitated reactor simultaneously, temperature of reaction is 60 ℃～80 ℃, and is after reaction finishes that lower floor's deposit liquid is extremely neutral with deionized water wash; Obtain reactant after the oven dry, then reactant is used the mortar dispersion treatment, and, the powder after the screening is put into muffle furnace in 700～800 ℃ of presintering 1～3h with the screening of 200 eye mesh screens; Again presintering powder is handled 3～5h in the ball mill mixing machine and carry out the ball milling second time, powder sieves with 200 eye mesh screens once more behind the ball milling, promptly obtains the ferrite powder below 200 orders.
5. the preparation method who is used for the ferrite absorber of absorbing high-frequency chamber higher mode according to claim 2 is characterized in that: in described step (2), the potpourri with ferrite powder and forming agent before granulation toasts 1～3h at 50～90 ℃.
6. the preparation method who is used for the ferrite absorber of absorbing high-frequency chamber higher mode according to claim 2; It is characterized in that: in described step (3); Dry at the ferrite base substrate; It is in the atmosphere at oxidizing atmosphere earlier before that binder is deviate from, more than baking 72h under 100～150 ℃ of conditions.
7. the preparation method who is used for the ferrite absorber of absorbing high-frequency chamber higher mode according to claim 2 is characterized in that: in described step (3), be the speed intensification to be lower than 1 ℃/minute, be warmed up to 350～550 ℃, and be incubated 5～8 hours.
8. the preparation method who is used for the ferrite absorber of absorbing high-frequency chamber higher mode according to claim 2; It is characterized in that: in described step (3); From 350～550 ℃ is to heat up to be lower than 0.5 ℃ of/minute speed; 40 ℃ of insulations of every intensification 10～20 minutes are raised to 1200～1350 ℃, are incubated 2～5 hours; Afterwards, in the cooling rate cooling that is lower than 1 ℃/minute, 50 ℃ of insulations of every cooling 10～20 minutes are cooled to room temperature until the ferrite tubular base substrate of sintering.
9. the preparation method who is used for the ferrite absorber of absorbing high-frequency chamber higher mode according to claim 2 is characterized in that: in described step (5), the ferrite block that applies silver slurry layer is in sintering process; Be in the intermediate sintering temperature stove, to carry out sintering; Sintering atmosphere is an air, is that the heating rate with 0.5～1.0 ℃/min is warming up to 550～750 ℃, insulation 10～30min; Then the cooldown rate with 0.5～1.0 ℃/min is cooled to 200～400 ℃, naturally cools to room temperature then.
10. the preparation method who is used for the ferrite absorber of absorbing high-frequency chamber higher mode according to claim 2; It is characterized in that: in described step (6); When the ferrite block assembly unit is welded in the frequency cavity cavity; Be warming up to 300～400 ℃ with 3～5 ℃/min heating rate, insulation 10～50min naturally cools to room temperature then.
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