CN116453837A - Manufacturing method of compression molding inductor with high drop performance - Google Patents
Manufacturing method of compression molding inductor with high drop performance Download PDFInfo
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- CN116453837A CN116453837A CN202310447943.8A CN202310447943A CN116453837A CN 116453837 A CN116453837 A CN 116453837A CN 202310447943 A CN202310447943 A CN 202310447943A CN 116453837 A CN116453837 A CN 116453837A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 238000000748 compression moulding Methods 0.000 title claims abstract description 16
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 101
- 229910052709 silver Inorganic materials 0.000 claims abstract description 80
- 239000004332 silver Substances 0.000 claims abstract description 80
- 238000005470 impregnation Methods 0.000 claims abstract description 40
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- 238000000576 coating method Methods 0.000 claims abstract description 18
- 238000009713 electroplating Methods 0.000 claims abstract description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 10
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- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 239000011148 porous material Substances 0.000 claims abstract description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 4
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- 239000002184 metal Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
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- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/005—Impregnating or encapsulating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
The invention discloses a manufacturing method of a compression molding inductor with strong dropping performance, which relates to the technical field of inductors, and solves the technical defects of poor dropping performance, easy dropping of an external electrode and poor weldability of the traditional inductor, and adopts the following technical scheme: manufacturing an inductor blank body and exposing a lead electrode terminal; the resin impregnation liquid is permeated into pores in the inductance blank body through the vacuum impregnation treatment, and an insulating film is formed; performing surface cleaning and baking treatment on the inductor blank to form a compact inductor body with a cured insulating film; and stripping paint to form an electrode area exposing the end of the extraction electrode, coating electrode silver paste, electroplating a nickel coating and a tin coating/tin-lead coating after silver burning treatment to form an external electrode, and thus obtaining the finished inductor product. According to the invention, the resin impregnation liquid is permeated into the inductor blank body to fill holes under the negative pressure condition, so that the compactness and the structural strength of the magnet in the inductor body are improved after solidification, the stripping of magnetic powder on the surface of the electrode area of the magnet is effectively avoided, meanwhile, the preparation method of the external electrode is optimized, the reliability of the combination of the external electrode and the inductor body is improved, and the overall falling property of the inductor is stronger.
Description
Technical Field
The invention relates to the technical field of inductance products and manufacturing processes thereof, in particular to a manufacturing method of a compression molding inductance with high drop performance.
Background
The compression molding inductor generally refers to an integrally molded inductor formed by heat curing after die casting of alloy powder, the high-voltage power supply has the advantages of low impedance, low loss and small parasitic capacitance, can withstand larger current and higher temperature, and is high in stability and reliability. With the development of miniaturization trend of electronic equipment and the requirement of SMT technology, compared with the mode of bending to form external electrodes, the miniaturized molded inductor mostly adopts a mode of paint stripping and electroplating to form external electrodes at present.
Because the magnet of the die-pressed inductor is made of alloy powder by cold pressing, compared with the laminated inductor made by high-temperature sintering, the magnet of the die-pressed inductor is relatively low in compactness and poor in consistency after the inner alloy powder particles are die-pressed, a plurality of tiny holes are inevitably formed in the inductor body, and the structure of the inductor body is reduced. In particular, the outer electrode area needs to be subjected to laser paint stripping treatment to remove the insulating protective outer layer so as to plate the electrode, and the paint stripping operation further weakens the bonding strength of the surface magnetic powder particles of the outer electrode area and the inductor body. Therefore, when the molded inductor is impacted by external force in the dropping test process, the surface magnetic powder directly connected with the external electrode is very easy to peel off from the inductor body, the external electrode drops, the dropping property of the inductor is poor, and the SMT welding reliability of the molded inductor is finally affected, so that the inductor cannot be used in products with high dropping property and welding property requirements, such as mobile power supplies, vehicle-mounted electronic equipment and the like.
Disclosure of Invention
In summary, the invention aims to solve the technical problems of poor dropping performance, low bonding strength, easy falling and poor weldability of the outer electrode and the inductor body of the traditional molded inductor formed by paint stripping and electroplating, and provides an improved molded inductor manufacturing method, which improves the compactness of an inductor magnet, ensures the bonding strength of powder particles and the inductor body, improves the connection reliability of the electroplated outer electrode and the inductor body, and further improves the dropping performance and the weldability of an inductor product.
In order to solve the technical defects, the invention adopts the technical scheme that the manufacturing method of the compression molding inductor with strong dropping performance is characterized by comprising the following steps:
step (1): embedding an inner electrode by using a metal soft magnetic powder material, adopting a cold pressing process to mould the inner electrode and the outer electrode, cutting the inner electrode to form an inductance blank, and exposing two leading-out electrode ends of the inner electrode;
step (2): under vacuum condition, adopting an impregnation treatment mode to infiltrate resin impregnation liquid into non-compact pores in the inductor blank, and forming a layer of insulating film on the outer surface of the inductor blank after the resin impregnation liquid is completely infiltrated;
step (3): cleaning the surface layer of the inductor blank with the insulating films formed by deionized water to remove redundant resin impregnation liquid and prevent the insulating films from adhering to each other;
step (4): baking the inductor blank with the cleaned surface layer to remove the residual deionized water on the surface of the inductor blank, solidifying the impregnated resin impregnation liquid and the impregnated resin impregnation liquid into a compact whole, and solidifying the insulating film to form the inductor blank;
respectively positioning and removing the solidified insulating film near the leading-out electrode end on the surface of the inductor body to form an electrode area exposing the leading-out electrode end;
step (6): and respectively coating electrode silver paste on each electrode area, forming a silver end electrode after silver burning treatment, and then electroplating a nickel coating and a tin coating/tin-lead coating on the formed silver end electrode in sequence by adopting an electroplating process to form an external electrode, so as to obtain an inductance finished product.
Further, the electrode silver paste comprises the following components in parts by weight: 70-75 parts of silver powder, 0.1-5 parts of non-silver conductive metal powder and/or metal oxide powder, 6-10 parts of low-temperature glass powder, 25-35 parts of organic carrier and 1-5 parts of coupling agent.
Further, the silver powder is flake silver powder, the silver powder is prepared by adopting a chemical reduction method, the flake diameter is 5-8 mu m, the specific surface area is 1.0-1.2 square meters per gram, and the silver powder is treated by a surface modifier before preparing electrode silver paste.
Further, the silver burning treatment in the step (6) specifically includes the following stages:
stage (6 a): gradually increasing the silver burning temperature to 200-300 ℃ from normal temperature within 0-30 minutes to evaporate the solvent and the adhesive in the electrode silver paste and promote the decomposition of the organic carrier;
stage (6 b): the silver burning temperature is gradually increased from 200-300 ℃ to 550-600 ℃ within 31-45 minutes, so as to promote the low-temperature glass powder to be converted from solid state to liquid state, and the liquid glass phase is gradually infiltrated into a metal phase formed by homogenization between silver powder and an organic carrier, so that a silver layer is promoted to be formed;
stage (6 c): the silver firing temperature is maintained at 550-600 ℃ within 46-55 minutes, so as to promote the growth of silver powder grains in the silver layer, promote the densification of the silver layer and improve the mass transfer property and the electrical property of the silver layer;
stage (6 d): the silver burning temperature is gradually reduced from 550-600 ℃ to normal temperature within 56-80 minutes, so as to promote the stress release of the silver layer, realize the annealing of the silver layer and finish the generation of the silver end electrode.
Further, the silver burning treatment in the step (6) is performed in an air atmosphere by using a mesh belt furnace, and the belt speed is 6.5-7.5 rpm.
Further, in the step (5), a laser paint stripping mode is adopted to burn off the cured insulating film so as to form the electrode region.
Further, the thickness of the external electrode is not lower than the thickness of the cured insulating film.
Further, the step (4) is performed by adopting an oven, the baking temperature is 160-180 ℃, the baking time is 1-1.5 h, and the inductor body is taken out after the inductor body is naturally cooled to room temperature after being baked.
Further, the step (2) is carried out by adopting vacuum dipping equipment, the vacuum pumping negative pressure of the equipment in the dipping process is between-900 Kpa and-800 Kpa, and the dipping treatment time is between 1.5 and 2.5 hours.
Further, the resin impregnation liquid comprises aqueous organic synthetic resin and deionized water, which are mixed and prepared in a ratio of 1:1.
Compared with the prior art, the invention has the beneficial effects that:
after the inductor blank is molded, a vacuum impregnation treatment mode is adopted, capillary pressure generated by the action of liquid surface tension under negative pressure is utilized, resin impregnation liquid is permeated into non-compact holes in the blank for filling, a layer of insulating film is formed on the outer surface of the inductor blank after resin impregnation is complete (namely resin impregnation and adsorption reach balance), magnet strength optimization of an inductor body and insulation encapsulation outside the inductor body are synchronously completed after baking and solidification, the compactness and consistency of the magnet are remarkably improved, the manufacturing steps are simplified, meanwhile, the magnet strength and the bonding strength between surface magnetic powder particles and the inductor body are improved, so that the surface particles of the inductor body can better resist paint stripping treatment and keep reliable bonding with the magnet, the connection strength of an external electrode and the inductor body is improved, through practical inspection, the external electrode in a product drop test can resist 1.5m high orientation without being peeled off from the inductor body, the welding reliability of an inductor product during chip bonding is remarkably improved, and the die pressing inductor manufactured by the method can drop the product with higher requirements on the performance and the welding reliability in a product drop welding process.
In addition, the surface layer of the inductor blank is cleaned by deionized water before baking and curing, so that redundant resin impregnating liquid remained on the surface of the inductor blank can be effectively removed, adhesion caused by adhesion of insulating films between the inductor blanks in the baking and curing process is avoided, the baking and curing continuity and consistency of the inductor blank are ensured, the production efficiency of products is improved, and bad products are avoided.
In addition, the manufacturing method has few steps, is simple to operate, is convenient to implement, reduces the manufacturing cost of the molded inductor product, and is favorable for popularization and use in the field.
Detailed Description
In order that those skilled in the art can better understand the technical solutions of the present invention, the present invention will be further described by the following specific examples and comparative examples, and the specific embodiments adopted in the following examples are only some preferred embodiments of the technical solutions of the present invention, and are not limiting the present invention.
Table 1: resin impregnation liquid and electrode silver paste composition ratio Table required in examples 1 to 4
The resin impregnation solutions and electrode silver pastes required in examples 1 to 4 were prepared respectively in accordance with the composition ratios shown in table 1, and then the compression-molded inductor products of the respective examples were manufactured respectively in accordance with the following methods, and the specific manufacturing methods include:
step (1): embedding an inner electrode by using a metal soft magnetic powder material, adopting a cold pressing process to mould the inner electrode and the outer electrode, cutting the inner electrode to form an inductance blank, and exposing two leading-out electrode ends of the inner electrode;
step (2): uniformly spreading the inductor blank obtained by molding in an impregnating tank of vacuum impregnating equipment, controlling the vacuumizing negative pressure of the vacuum impregnating equipment between-900 Kpa and-800 Kpa, controlling the impregnating treatment time to be 1.5-2.5 h, controlling the ambient temperature to be about 10-30 ℃, and penetrating the resin impregnating liquid prepared in advance into non-compact pores in the inductor blank in an impregnating treatment mode by utilizing equipment vacuum conditions, wherein an insulating film is formed on the outer surface of the inductor blank after the resin impregnating liquid is completely penetrated;
step (3): the electrode blanks which are subjected to dipping treatment and coated with the insulating coating are taken out and placed in a vibration cleaning tray, the surface layers of the inductor blanks in the tray are sprayed and cleaned through deionized water, and the inductor blanks are separated from each other by vibrating while spraying so as to remove redundant resin impregnation liquid and prevent the insulating coating among the inductor blanks from being adhered to each other;
step (4): uniformly spreading the inductor blank with the clean surface layer on dust-free paper at the bottom of an oven tray, wherein the baking temperature is set between 160 and 180 ℃ and the baking time is 1 to 1.5 hours, so as to remove the deionized water and the solidified insulating film remained on the surface of the inductor blank, and solidifying the impregnated resin impregnation liquid and the impregnated resin impregnation liquid into a compact whole to form the inductor body; after baking, naturally cooling to room temperature, and then taking out the inductor body;
positioning and burning off the insulating film solidified near the leading-out electrode end on the surface of the inductor body by adopting a laser paint stripping mode to form an electrode area exposing the leading-out electrode end;
step (6): and respectively coating the electrode silver paste prepared in advance on each electrode area of the inductor body, forming a silver end electrode on the surface of the inductor body after silver burning treatment, and then electroplating a nickel coating and a tin coating/tin-lead coating on the formed silver end electrode in sequence by adopting an electroplating process to form an external electrode, so as to prepare an inductor finished product.
Wherein, the silver burning treatment in the step (6) is carried out in the atmosphere by adopting a special mesh belt furnace with the belt speed of 6.5-7.5 rpm, and specifically comprises the following steps:
step (6 a): gradually increasing the silver burning temperature to 200-300 ℃ from normal temperature within 0-30 minutes to evaporate the solvent and the adhesive in the electrode silver paste and promote the decomposition of the organic carrier;
step (6 b): the silver burning temperature is gradually increased from 200-300 ℃ to 550-600 ℃ within 31-45 minutes, so as to promote the low-temperature glass powder to be converted from solid state to liquid state, and the liquid glass phase is gradually infiltrated into a metal phase formed by homogenization between silver powder and an organic carrier, so that a silver layer is promoted to be formed;
step (6 c): the silver firing temperature is maintained at 550-600 ℃ within 46-55 minutes, so as to promote the growth of silver powder grains in the silver layer, promote the densification of the silver layer and improve the mass transfer property and the electrical property of the silver layer;
step (6 d): the silver burning temperature is gradually reduced from 550-600 ℃ to normal temperature within 56-80 minutes, so as to promote the stress release of the silver layer, realize the annealing of the silver layer and finish the generation of the silver end electrode.
After the molded inductor products of examples 1 to 4 were manufactured by the above method, 100 products of each example were randomly extracted, and drop test was performed on each product, and the test results thereof were shown in table 2, and the test was performed at room temperature with the test platform being a cement platform.
Table 2: drop test data sheet for molded inductor products of examples 1-4
As shown in the test results of Table 2, when the drop height is raised to 1.8m, about 20-30% of the inductance products of the embodiment 1 and the embodiment 3 have the condition that the end part of the outer electrode is slightly tilted, but the inductance body is free of abnormity such as cracking, the inductance products of the embodiments falling within 1.5m are free of any abnormity, the inductance detection deviation is extremely small after the drop test, the normal deviation is not influenced, and the normal use is not influenced, so that the molded inductance manufactured by the method can effectively bear the drop detection of 1.5m, has good drop performance and high connection reliability of the outer electrode and the inductance body, and can be applied to products with high requirements on the drop performance such as mobile power supplies and vehicle-mounted electronic equipment.
Further, to demonstrate the significant improvement in molded inductors made by the method of the present invention over products made by prior methods, the following is specifically demonstrated by way of four comparative examples.
Comparative example 1
The composition of the resin impregnation liquid and the electrode silver paste required in comparative example 1 were exactly the same as in example 1, the essential difference between them being the manufacturing method, in particular: after the inductor blank of comparative example 1 was compression molded, the resin impregnation liquid was directly coated outside the inductor blank by an atmospheric pressure impregnation apparatus instead of being processed by a vacuum impregnation apparatus, and the resin was not effectively penetrated into the pores of the magnet compression molded by the inductor blank, and the other manufacturing steps were the same as the method of the present invention, to finally obtain the compression molded inductor product of comparative example 1.
Comparative example 2
The resin impregnation liquid required in comparative example 2 is identical to that in example 2, and the essential difference between the two is that the electrode silver paste required in comparative example 1 is a commercially available conventional electrode silver paste, the specific model is RT-650, and the rest of the manufacturing steps are identical to those of the method of the invention, so that the molded inductor product in comparative example 2 is finally obtained.
Comparative example 3
The manufacturing method of comparative example 3 is identical to the method of the present invention, and the essential difference between the resin impregnation liquid and the electrode silver paste required in comparative example 3 is that the resin impregnation liquid of comparative example 3 is prepared by uniformly mixing epoxy resin, water glass and deionized water in a ratio of 3:1:6, and the electrode silver paste of comparative example 3 is a commercially available conventional electrode silver paste RT-650, and the molded inductor product of comparative example 3 is manufactured according to the method of the present invention.
After the molded inductor products of comparative examples 1 to 3 were prepared, drop tests were respectively performed, the test results thereof were shown in table 3, the test was performed at room temperature, and the test platform was a cement platform.
Table 3: drop test data sheet for molded inductor products of comparative examples 1-3
As can be seen from comparison of table 2 and table 3 and example 1, under the condition that the resin impregnation liquid and the electrode silver paste are completely the same, the magnet of the inductor blank subjected to vacuum negative pressure impregnation treatment has higher compactness and consistency, and the magnet has strong binding force, compared with comparative example 1, the magnet particles on the surface of the electrode area of the inductor product of example 1 can better resist the treatment of laser paint stripping, maintain the binding force with the inductor body, can effectively avoid the warping or even falling off of the outer electrode within the falling range of 1.5m, and remarkably improve the falling performance of the molded inductor.
By combining tables 2 and 3 and comparing comparative example 2 with example 2, the invention can obviously improve the reliability of the connection between the external electrode and the inductor body by optimally adjusting the silver paste components of the electrode, so that the molded inductor manufactured by the method can withstand larger impact, ensure the structural reliability of the inductor body and simultaneously avoid the warping and falling of the external electrode. The optimization effect of the silver paste on the electrode is mainly reflected in adopting the flake silver powder, optimizing the component ratio of the silver powder to the conductive metal powder, the metal oxide powder, the low-temperature glass powder and the organic carrier, and promoting the discharge of colloid such as solvent and the decomposition of the organic carrier through the step (6 a) of the silver firing step, the treatment method of the step (6 b) can promote the softening of the glass powder, improve the infiltration and mass transfer effect of molten glass on silver powder particle sheets, be favorable for the growth of silver powder grains, the heat preservation treatment process of the step (6 c) obviously promotes the densification of the silver layer metal phase, further infiltrates the molten glass phase into the silver layer, avoids the problem of poor electroplating binding force caused by the floating of the glass phase, and the addition of flake silver powder particles makes the silver layer easier to densify and smoother, provides an excellent adhesion substrate for the electroplating of the subsequent nickel plating, has stronger binding force, and further improves the connection reliability between the external electrode and the inductor body.
By combining tables 2 and 3 and comparing comparative example 3 with examples 1-4, under the same conditions of the manufacturing method, the optimized improvement of the resin impregnation liquid and the electrode silver paste has obvious influence on the drop performance of the inductance product, namely, the resin impregnation liquid and the electrode silver paste prepared by the method can obviously improve the drop performance of the inductance product, and compared with the existing product, the electrode silver paste has relatively low silver content and low sintering temperature, reduces the production and manufacturing cost on the premise of ensuring the stable product quality, and is beneficial to popularization and use in the field.
The foregoing examples are merely for the purpose of illustrating the technical solution of the present invention, and are not intended to limit the embodiments of the present invention. Various modifications and alterations of this invention will be apparent to those skilled in the art without departing from the spirit and substance of this invention, and it is intended to cover all such modifications and alterations as fall within the true scope of this invention.
Claims (10)
1. The manufacturing method of the compression molding inductor with strong dropping performance is characterized by comprising the following steps:
step (1): embedding an inner electrode by using a metal soft magnetic powder material, adopting a cold pressing process to mould the inner electrode and the outer electrode, cutting the inner electrode to form an inductance blank, and exposing two leading-out electrode ends of the inner electrode;
step (2): under vacuum condition, adopting an impregnation treatment mode to infiltrate resin impregnation liquid into non-compact pores in the inductor blank, and forming a layer of insulating film on the outer surface of the inductor blank after the resin impregnation liquid is completely infiltrated;
step (3): cleaning the surface layer of the inductor blank with the insulating films formed by deionized water to remove redundant resin impregnation liquid and prevent the insulating films from adhering to each other;
step (4): baking the inductor blank with the cleaned surface layer to remove the residual deionized water on the surface of the inductor blank, solidifying the impregnated resin impregnation liquid and the impregnated resin impregnation liquid into a compact whole, and solidifying the insulating film to form the inductor blank;
step (5): respectively positioning and removing the insulating film solidified near the leading-out electrode end on the surface of the inductor body to form an electrode area exposing the leading-out electrode end;
step (6): and respectively coating electrode silver paste on each electrode area, forming a silver end electrode after silver burning treatment, and then electroplating a nickel coating and a tin coating/tin-lead coating on the formed silver end electrode in sequence by adopting an electroplating process to form an external electrode, so as to obtain an inductance finished product.
2. The method for manufacturing the compression molding inductor with high drop performance according to claim 1, wherein the method comprises the following steps: the electrode silver paste comprises the following components in parts by weight: 70-75 parts of silver powder, 0.1-5 parts of non-silver conductive metal powder and/or metal oxide powder, 6-10 parts of low-temperature glass powder, 25-35 parts of organic carrier and 1-5 parts of coupling agent.
3. The method for manufacturing the compression molding inductor with strong dropping performance according to claim 2, wherein the method comprises the following steps: the silver powder is flake silver powder, the silver powder is prepared by adopting a chemical reduction method, the flake diameter is 5-8 mu m, the specific surface area is 1.0-1.2 square meter/g, and the silver powder is treated by a surface modifier before preparing electrode silver paste.
4. The method for manufacturing the compression molding inductor with high drop performance according to claim 1, wherein the method comprises the following steps: the silver burning treatment in the step (6) specifically comprises the following steps:
step (6 a): gradually increasing the silver burning temperature to 200-300 ℃ from normal temperature within 0-30 minutes to evaporate the solvent and the adhesive in the electrode silver paste and promote the decomposition of the organic carrier;
step (6 b): the silver burning temperature is gradually increased from 200-300 ℃ to 550-600 ℃ within 31-45 minutes, so as to promote the low-temperature glass powder to be converted from solid state to liquid state, and the liquid glass phase is gradually infiltrated into a metal phase formed by homogenization between silver powder and an organic carrier, so that a silver layer is promoted to be formed;
step (6 c): the silver firing temperature is maintained at 550-600 ℃ within 46-55 minutes, so as to promote the growth of silver powder grains in the silver layer, promote the densification of the silver layer and improve the mass transfer property and the electrical property of the silver layer;
step (6 d): the silver burning temperature is gradually reduced from 550-600 ℃ to normal temperature within 56-80 minutes, so as to promote the stress release of the silver layer, realize the annealing of the silver layer and finish the generation of the silver end electrode.
5. The method for manufacturing the compression molding inductor with high drop performance according to claim 1, wherein the method comprises the following steps: the silver burning treatment in the step (6) is carried out in an air atmosphere by adopting a mesh belt furnace, and the belt speed is 6.5-7.5 rpm.
6. The method for manufacturing the compression molding inductor with high drop performance according to claim 1, wherein the method comprises the following steps: and (3) burning off the cured insulating film by adopting a laser paint stripping mode in the step (5) to form the electrode region.
7. The method for manufacturing the compression molding inductor with high drop performance according to claim 1, wherein the method comprises the following steps: the thickness of the external electrode is not lower than the thickness of the cured insulating film.
8. The method for manufacturing the compression molding inductor with high drop performance according to claim 1, wherein the method comprises the following steps: the step (4) is carried out by adopting an oven, the baking temperature is 160-180 ℃, the baking time is 1-1.5 h, and the inductor body is taken out after the inductor body is naturally cooled to room temperature after being baked.
9. The method for manufacturing the compression molding inductor with high drop performance according to claim 1, wherein the method comprises the following steps: the step (2) is carried out by adopting vacuum impregnation equipment, the equipment vacuumizing negative pressure is between-900 Kpa and-800 Kpa in the impregnation process, and the impregnation treatment time is between 1.5 and 2.5 hours.
10. The method for manufacturing the compression molding inductor with high drop performance according to claim 1, wherein the method comprises the following steps: the resin impregnation liquid comprises aqueous organic synthetic resin and deionized water, which are mixed and prepared according to the proportion of 1:1.
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