An arcuate ceramic housing and method of manufacture

Abstract

The application provides an arc-shaped ceramic shell and a manufacturing method. The manufacturing method comprises the following steps: mixing ceramic powder, a binder, a dispersing agent, a plasticizer, a solvent and the like according to a certain proportion, and ball milling for a certain time to form a ceramic slurry; after the ceramic slurry is flow-casted, a flow-cast strip is formed; the flow-cast strip is punched and chambered to obtain a green ceramic strip; a hole filling machine is used to fill the metal slurry in the holes punched on the green ceramic strip; a circuit is printed on the green ceramic strip; each green ceramic strip is compacted by using an isostatic pressing method, and the isostatic pressing pressure gradually decreases according to the order of the stacking levels; the compacted green ceramic strips are stacked according to the order of the stacking levels; the green ceramic body is cut into a green ceramic body unit; and after the green ceramic body unit is sintered, an arc-shaped ceramic shell is obtained. During the sintering process, the sintered green ceramic body will be bent into an arc-shaped ceramic shell due to the stress difference between the green ceramic strips of different layers, so as to meet the packaging requirement of the ceramic shell with a curved surface.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ceramic shell forming, and particularly discloses an arc-shaped ceramic shell and a manufacturing method. BACKGROUND

[0002] New generation communication systems, microwave millimeter wave phased array radars and other electronic equipment are gradually developing towards miniaturization, light weight and high reliability, which requires continuous improvement of the assembly and interconnection density of microwave circuits, and higher requirements for the form and size of the packaging ceramic shell. The existing ceramic shell is usually manufactured by low-temperature co-fired ceramic (LTCC) or high-temperature co-fired ceramic (HTCC).

[0003] The lamination of low-temperature co-fired ceramic and high-temperature co-fired ceramic is to stack the green ceramic tapes together and then use isostatic pressing to compact. After sintering treatment, the produced ceramic shell is in a planar shape. Using the existing manufacturing method, an arc-shaped ceramic shell cannot be directly manufactured.

[0004] In some fields that require the use of curved ceramic shells for packaging, due to the lack of arc-shaped ceramic shells, multiple planar ceramic shells are used to splice an arc-shaped ceramic shell to meet the packaging requirements. SUMMARY

[0005] The technical problem to be solved by the present application is to provide an arc-shaped ceramic shell and a manufacturing method, which can directly manufacture an arc-shaped ceramic shell and meet the demand for using arc-shaped ceramic shells for packaging.

[0006] In a first aspect, the present application provides an arc-shaped ceramic shell and a manufacturing method, comprising the following steps:

[0007] S1, ceramic powder, binder, dispersant, plasticizer and solvent are mixed in a certain proportion and ball milled for a certain time to form a ceramic slurry;

[0008] S2, the ceramic slurry formed in step S1 is flow-casted to obtain a flow-casting tape;

[0009] S3, the flow-casting tape formed in step S2 is punched and chambered by a mold to obtain n green ceramic tapes;

[0010] S4, the green ceramic tapes obtained in step S3 are filled with metal slurry in the holes punched by the hole filling machine;

[0011] S5, a corresponding circuit is printed on each green ceramic tape;

[0012] S6, the green porcelain tape is respectively compacted by isostatic pressing, and the isostatic pressing pressure is gradually decreased according to the order of the stacking levels;

[0013] S7, the green porcelain tape is respectively compacted by isostatic pressing, and the isostatic pressing pressure is gradually decreased according to the order of the stacking levels;

[0014] S8, the green porcelain body is cut into m green porcelain body units;

[0015] S9, the green porcelain body unit is sintered to obtain the arc-shaped ceramic shell.

[0016] Further, the maximum pressure of the isostatic pressing is 500Mpa.

[0017] Further, the pressure of the isostatic pressing of the adjacent green porcelain tape is reduced by 5%-15% according to the order of the stacking levels.

[0018] Further, the sintering temperature is 700-2000 DEG C.

[0019] Further, the green porcelain tape is pasted with glue on the surface when being stacked in the step 7.

[0020] The second aspect of the present application provides an arc-shaped ceramic shell, which is manufactured by the arc-shaped ceramic shell manufacturing method.

[0021] The present application has the advantages that the green porcelain tapes of the green porcelain body are isostatically pressed separately, and the isostatic pressing pressure is gradually decreased according to the order of the stacking levels. During the sintering process, the green porcelain body is curved into an arc-shaped ceramic shell due to the stress difference between the green porcelain tapes of each layer, so as to meet the needs of the packaging of the ceramic shell with curved surface. BRIEF DESCRIPTION OF DRAWINGS

[0022] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0023] Fig. 1 is the production process flow chart of the arc-shaped ceramic shell of the present application;

[0024] Fig. 2 is the structural schematic diagram of the arc-shaped ceramic shell of the present application.

[0025] In the drawings, the components represented by the numbers are as follows: DETAILED DESCRIPTION

[0026] Please refer to Figs. 1-2 The first aspect of the present application provides an arc-shaped ceramic shell manufacturing method, which comprises the following steps:

[0027] S1, ceramic powder, binder, dispersant and plasticizer and solvent are proportioned and ball milled for a certain time to form a ceramic slurry;

[0028] S2, the ceramic slurry formed in step S1 is flow-casted to obtain a flow-cast strip;

[0029] S3, the flow-cast strip formed in step S2 is punched and chambered by a mold to obtain n green ceramic strips; n is an integer, and the value of n is set according to the actual demand of the ceramic shell.

[0030] S4, the green ceramic strip obtained in step S3 is filled with metal slurry in the hole punched in the green ceramic strip by a hole filling machine;

[0031] S5, a corresponding circuit is printed on each green ceramic strip; when printing, a screen is used to print patterns and wiring on the surface of the green ceramic strip.

[0032] S6, each green ceramic strip is compacted by isostatic pressing, and the isostatic pressing pressure gradually decreases according to the order of the stacking levels;

[0033] S7, the compacted green ceramic strips are stacked in order according to the order of the stacking levels to obtain a green ceramic body;

[0034] S8, the green ceramic body is cut into m green ceramic body units; m is an integer.

[0035] S9, the green ceramic body units are sintered to obtain an arc-shaped ceramic shell.

[0036] Specifically, the maximum pressure of the isostatic pressing is 500 Mpa.

[0037] Specifically, the pressure of the isostatic pressing of adjacent green ceramic strips decreases by 5%-15% according to the order of the stacking levels.

[0038] Specifically, the sintering temperature is 700-2000 DEG C.

[0039] Specifically, glue is applied to the surface of each green ceramic strip when the green ceramic strips are stacked in step 7.

[0040] In the second aspect, the application provides an arc-shaped ceramic shell manufactured by the arc-shaped ceramic shell manufacturing method.

[0041] In some fields requiring curved ceramic shells for packaging, such as laser radar, etc., there is no arc-shaped ceramic shell, so that multiple planar ceramic shells are used to splice an arc-shaped ceramic shell to meet the packaging requirements.

[0042] The green ceramic tape which constitutes the green ceramic body is separated and isostatic pressed, and the isostatic pressing pressure is gradually decreased according to the order of the stacking levels. During the sintering process, due to the stress difference between the green ceramic tapes of each layer, the sintered green ceramic body will be curved into an arc shape, forming an arc ceramic shell, to meet the needs of laser radar and other curved surface ceramic shells for packaging.

[0043] Although the specific embodiments of the present application are described above, those skilled in the art should understand that the specific embodiments described are only illustrative, and are not intended to limit the scope of the present application, and equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present application should be covered within the scope of the claims of the present application.

Claims

1. A method for manufacturing a curved ceramic housing, characterized in that: The following steps are included: S1. Ceramic powder, binder, dispersant, plasticizer and solvent are ball-milled in a certain proportion for a certain time to form a ceramic slurry; S2, performing tape casting on the ceramic slurry formed in step S1 to obtain a tape; S3, using a mold to punch holes and cavities on the tape material formed in step S2 to obtain n green porcelain tapes; S4, using a hole filling machine to fill the holes punched out of the green porcelain tape obtained in step S3 with metal slurry; S5. Print the corresponding circuit on each raw porcelain tape; S6. Compact each raw porcelain strip by isostatic pressing, and the isostatic pressing pressure used decreases step by step according to the order of stacking layers; S7, stacking the compacted green porcelain strips in the order of stacking layers to obtain a green porcelain body; S8, cutting the green porcelain body into m green porcelain body units; S9, sintering the green ceramic body unit to obtain a curved ceramic shell.

2. The method for manufacturing a curved ceramic housing according to claim 1, wherein: The maximum pressure of the isostatic pressing is 500 MPa.

3. The method for manufacturing a curved ceramic housing according to claim 2, wherein: According to the order of stacking layers, the pressure of the adjacent green porcelain strips during isostatic pressing is reduced by 5%-15%.

4. A method for manufacturing a curved ceramic housing according to any one of claims 1 to 3, characterized in that: The sintering temperature is 700°C to 2000°C.

5. The method for manufacturing a curved ceramic housing according to claim 4, wherein: When the green porcelain tapes are stacked in step 7, glue is applied on the surface of each green porcelain tape.

6. A curved ceramic housing, characterized in that: The arc-shaped ceramic shell is manufactured by the method for manufacturing the arc-shaped ceramic shell according to any one of claims 1 to 5.

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