A method for preparing a special-shaped multi-step LTCC coupler

Abstract

The present invention discloses a preparation method of a special-shaped multi-step LTCC coupler, including batching; casting; cutting; opening; printing; lamination: using a fully automatic alignment lamination machine to perform lamination, stacking raw porcelain strips of the same shape together to form a Bar block, and then laminating different Bar blocks to form a green body of the final product; isostatic pressing: final pressing the laminated diaphragm by isostatic pressing; isostatic pressing maximum temperature: 70±5°C; holding time: 600s~900s; holding pressure: 5100psi~8300psi, forming a Bar block; cutting: dividing the Bar block to form an independent product unit, the unit size is 11.9±0.10*9.52±0.10; debinding; sintering; chamfering; silver dipping; silver burning; electroplating. The present invention uses different steps to form a bar block unit by lamination, and then lamination of the bar block unit, thereby reducing the problem of product step collapse caused by multiple laminations.

Description

Technical Field

[0001] The invention relates to a method for preparing a special-shaped multi-step LTCC coupler, belonging to the technical field of LTCC coupler preparation. Background Art

[0002] According to the normal production process, the lamination process of the special-shaped multi-step LTCC coupler completes the lamination of the products at one time. Due to multiple laminations, the edges of the products will be pressed and collapsed, resulting in unqualified products. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for preparing a special-shaped multi-step LTCC coupler, which can solve the problem of product step collapse caused by multiple laminations.

[0004] The technical solution adopted by the present invention is: a method for preparing a special-shaped multi-step LTCC coupler, the method comprising the following steps: S1. Ingredients: Select the dielectric constant of the material to be 7.2, and ball-mill the powder to a set particle size of 0.2-1 μm; S2, tape casting: the ingredients after ball milling are prepared into slurry, and the tape casting technology is used to obtain high-precision green porcelain tapes of different thicknesses (the key film thickness is 134±3um); S3, cutting: cutting the raw porcelain tape into raw porcelain tapes of set size (usually (152.4±0.5) mm * (152.4±0.5) mm); S4, drilling: drilling holes on the raw porcelain strip where holes need to be drilled; S5. Printing: The printing method is screen printing. The design pattern is prepared on the film, and then transferred to the 400-mesh and 300-mesh steel screens covered with photosensitive adhesive after exposure to form a printing jig; by controlling the photosensitive adhesive coating thickness: 37±2μm~; printing GAP value: 0.5mm~3mm; printing scraper pressure: 0.05MPa~0.20MPa; scraper step speed 0.01m / s~0.10m / s; each layer of the design model is printed on the green porcelain tape of corresponding thickness, and the printed inductor line width is 476±7μm; S6. Lamination: Use special equipment (such as fully automatic alignment lamination machine) to perform lamination. Lay the raw porcelain strips of the same shape together to form Bar blocks, and then laminate the different Bar blocks to form the final green product; S7, isostatic pressing: the laminated membrane is subjected to final isostatic pressing; the maximum isostatic pressing temperature is 70±5℃; the holding time is 600s~900s; the holding pressure is 5100psi~8300psi, forming a Bar block; S8, cutting: divide the Bar block into independent product units, with unit size of 11.9±0.10*9.52±0.10; S9, debinding: Debinding the split products for 36 hours according to the debinding curve; S10, sintering: the debinding products are sintered in a tunnel furnace; there are 8 to 10 sintering temperature zones, sintering temperature: 850℃~900℃, and holding time: 80min~100min; S11, chamfering: chamfering the sintered product; S12, Silver Dipping: Use a fully automatic terminal electrode silver dipping machine to coat the external terminal electrodes of the chamfered products; S13, Silver Burning: Silver burning process is performed on the silver-coated products; silver burning is performed using a tunnel furnace; there are 6 sintering temperature zones, sintering temperature: 600℃~715℃, and holding time: 25min~35min; S14, electroplating: the product after silver firing is electroplated into the final product, nickel-gold electroplating: nickel layer thickness: 4~8um, gold layer thickness: 3um~5um. Beneficial effects of the present invention: Compared with the prior art, the present invention uses different steps to form bar block units by separate lamination, and then stacks the bar block units, thereby reducing the problem of product step collapse caused by multiple laminations. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 It is a schematic diagram of the three-dimensional structure of a special-shaped multi-step LTCC coupler; Figure 2 This is a schematic diagram of the three-dimensional structure of the special-shaped multi-step LTCC coupler from another perspective; Figure 3 It is the circuit schematic diagram of the special-shaped multi-step LTCC coupler. DETAILED DESCRIPTION

[0006] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0007] Example 1: Figure 1-3 As shown, a method for preparing a special-shaped multi-step LTCC coupler comprises the following steps: S1. Ingredients: Select the dielectric constant of the material to be 7.2, and ball-mill the powder to a set particle size of 0.2-1 μm; S2, tape casting: the ingredients after ball milling are prepared into slurry, and the tape casting technology is used to obtain high-precision green porcelain tapes of different thicknesses (the key film thickness is 134±3um); S3, cutting: cutting the raw porcelain tape into raw porcelain tapes of set size (usually (152.4±0.5) mm * (152.4±0.5) mm); S4, drilling: drilling holes on the raw porcelain strip where holes need to be drilled; S5. Printing: The printing method is screen printing. The design pattern is prepared on the film, and then transferred to the 400-mesh and 300-mesh steel screens covered with photosensitive adhesive after exposure to form a printing jig; by controlling the photosensitive adhesive coating thickness: 37±2μm~; printing GAP value: 0.5mm~3mm; printing scraper pressure: 0.05MPa~0.20MPa; scraper step speed 0.01m / s~0.10m / s; each layer of the design model is printed on the green porcelain tape of corresponding thickness, and the printed inductor line width is 476±7μm; S6. Lamination: Use special equipment (such as fully automatic alignment lamination machine) to perform lamination. Lay the raw porcelain strips of the same shape together to form Bar blocks, and then laminate the different Bar blocks to form the final green product; S7, isostatic pressing: the laminated membrane is subjected to final isostatic pressing; the maximum isostatic pressing temperature is 70±5℃; the holding time is 600s~900s; the holding pressure is 5100psi~8300psi, forming a Bar block; S8, cutting: divide the Bar block into independent product units, with unit size of 11.9±0.10*9.52±0.10; S9, debinding: Debinding the split products for 36 hours according to the debinding curve; S10, sintering: the debinding products are sintered in a tunnel furnace; there are 8 to 10 sintering temperature zones, sintering temperature: 850℃~900℃, and holding time: 80min~100min; S11, chamfering: chamfering the sintered product; S12, Silver Dipping: Use a fully automatic terminal electrode silver dipping machine to coat the external terminal electrodes of the chamfered products; S13, Silver Burning: Silver burning process is performed on the silver-coated products; silver burning is performed using a tunnel furnace; there are 6 sintering temperature zones, sintering temperature: 600℃~715℃, and holding time: 25min~35min; S14, electroplating: the product after silver firing is electroplated into the final product, nickel-gold electroplating: nickel layer thickness: 4~8um, gold layer thickness: 3um~5um. In order to adapt to the welding of different heights of each lead-out terminal, the height of each lead-out terminal of the prepared LTCC coupler is designed to be in the same plane as the port to be welded, thereby meeting the welding requirements of different planes.

[0008] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for preparing a special-shaped multi-step LTCC coupler, characterized in that: The method comprises the following steps: S1. Ingredients: Select a material with a dielectric constant of 7.2, and ball-mill the powder to a set particle size of 0.2-1 μm; S2, tape casting: the ingredients after ball milling are prepared into slurry, and the raw porcelain tapes of different thicknesses are obtained by tape casting technology; S3, cutting: cutting the raw porcelain tape into raw porcelain tapes of set sizes; S4, drilling: drilling holes on the raw porcelain strip where holes need to be drilled; S5. Printing: The printing method is screen printing. The design pattern is prepared on the film, and then transferred to the 400-mesh and 300-mesh steel screens covered with photosensitive adhesive after exposure to form a printing jig; by controlling the photosensitive adhesive coating thickness: 37±2μm~; printing GAP value: 0.5mm~3mm; printing scraper pressure: 0.05MPa~0.20MPa; scraper step speed 0.01m / s~0.10m / s; each layer of the design model is printed on the green porcelain tape of corresponding thickness, and the printed inductor line width is 476±7μm; S6. Lamination: Use a fully automatic alignment lamination machine to stack the raw porcelain strips of the same shape together to form Bar blocks, and then stack different Bar blocks to form the final green product; S7, isostatic pressing: the laminated membrane is subjected to final isostatic pressing; the maximum isostatic pressing temperature is 70±5℃; the holding time is 600s~900s; the holding pressure is 5100psi~8300psi, forming a Bar block; S8, cutting: divide the Bar block into independent product units, with the unit size of 11.9±0.10*9.52±0.10; S9, debinding: Debinding the split products for 36 hours according to the debinding curve; S10, sintering: the debinding products are sintered in a tunnel furnace; there are 8 to 10 sintering temperature zones, sintering temperature: 850℃~900℃, and holding time: 80min~100min; S11, chamfering: chamfering the sintered product; S12, Silver Dipping: Use a fully automatic terminal electrode silver dipping machine to coat the external terminal electrodes of the chamfered products; S13, Silver Burning: Silver burning process is performed on the silver-coated product; silver burning is performed using a tunnel furnace; there are 6 sintering temperature zones, sintering temperature: 600℃~715℃, and holding time: 25min~35min; S14, electroplating: the product after silver firing is electroplated into the final product, nickel-gold electroplating: nickel layer thickness: 4~8um, gold layer thickness: 3um~5um.

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