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A kind of ceramic hollow buoyancy ball and its manufacturing method

A manufacturing method and technology for buoyancy balls, which are used in ceramics, buoyancy materials and marine fields, and can solve the problems of limited ball size and no ceramic hollow buoyancy balls.

Active Publication Date: 2021-04-27
SHANGHAI RES INST OF MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there are Chinese patents 96248613.2, 200610017765.1, 201110437012.7, 201210013921.2, using some burnable materials (polystyrene, sawdust, carbon black plus flour, etc.) A layer of ceramic powder is wrapped on the surface of the template ball, calcined to remove the template ball and then sintered to prepare hollow balls. The materials are mainly oxide ceramics such as alumina and zirconia. The hollow balls prepared by this method have uniform wall thickness and low density. control, but the size of the ball is limited (below 40mm), and the material is limited to oxide ceramics. Due to this limitation, in the above-mentioned patent example, under the condition of compressive strength of 150MPa, the minimum density can only reach 0.54g / cm 3
So far, there are no public literature and patent reports at home and abroad that use Si, which has the highest strength-to-mass ratio in ceramics. 3 N 4 Materials to prepare ceramic hollow buoyant balls, and there is no report on the preparation of ceramic hollow buoyant balls by sealing two hemispherical shells

Method used

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  • A kind of ceramic hollow buoyancy ball and its manufacturing method
  • A kind of ceramic hollow buoyancy ball and its manufacturing method

Examples

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Embodiment 1

[0029]Additive manufacturing technology (3D printing process) mainly has the following types: (1) (Threedimensional printing, 3DP), the "glue" type of computer-controlled nozzle is printed layer by layer on the ceramic raw material powder bed. After printing, The ceramic body is cleaned up for post-processing. (2) Stereolithography (Stereolithography, SLA or Digital Light Processing, DLP), ceramic powder is mixed in the photosensitive resin liquid, and the light source controlled by the computer is printed layer by layer on the resin bed. After the printing is completed, the green body is cleaned Come out for later processing. (3) Selective Laser Sintering (Selective Laser Sintering, SLS)

[0030] This embodiment only uses SLS 3D printing to illustrate the principle and process of forming ceramic hemispherical shell blanks. Other 3D printing processes can also form ceramic hemispherical shell blanks (the principle and process will not be described again, and this technology ...

Embodiment 2

[0037] Ceramic hemispherical shell blanks can also be formed by traditional ceramic molding techniques such as slip casting, gel injection molding, and powder pressing (cold isostatic pressing includes two processes of "wet bag" and "dry bag"). After a series of green body post-processing (such as debinding), the subsequent process is the same as the corresponding steps in Example 1.

[0038] Grouting molding refers to pouring ceramic raw material slurry in the negative spherical surface of the hemispherical plaster mold and rotating it at a certain speed. The slurry is adsorbed on the surface of the gypsum to form a hemispherical shell. After a period of time, it is solidified and formed into a hemispherical shell. The shell is taken out. After drying, debinding, sintering and other processes.

[0039] Gel injection molding is a colloidal molding process. By preparing ceramic slurry containing organic monomers, adding initiators and catalysts, injecting them into specific mol...

Embodiment 3

[0042] Ceramic hollow buoyancy balls can also be made of alumina and silicon carbide (SiC), and the ingredients are mixed uniformly by ball milling, and then spray-dried, granulated, and sieved to obtain a powder with a particle size of 15-60 μm. 3D printing or powder compression molding; it can also be prepared by ball milling method, mixed evenly and directly injected into grout, gel injection molding. The molded hemispherical shell green body undergoes a series of post-processing of the green body, and is loaded into a furnace for sintering. The subsequent processes are the same as the corresponding steps in Example 1 except for the sintering process. All those skilled in the art can realize according to the conception of the present invention.

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Abstract

The invention discloses a ceramic hollow buoyancy ball and a manufacturing method thereof, comprising the following steps: step 1, forming a hemispherical shell green body (green body), post-processing the hemispherical shell green body, and obtaining the hemispherical shell sintering through first sintering Step 2, perform precision machining on the edge of the hemispherical shell, so that the edges of the two hemispherical shells can be completely contacted when they are close to each other; Step 3, perform hot isostatic pressing on the precision-machined hemispherical shell; Step 4: After grinding and polishing the edge of the hemispherical shell after hot isostatic pressing, the edges of the two hemispherical shells are butted and merged into a sphere and vacuumed, and the two hemispherical shells are sucked together to form a hollow sphere. ; Step 5, the hollow sphere is sintered and sealed for the second time, and a complete hollow buoyancy ball is obtained after being released from the furnace, and the sealing joint is covered to reduce the stress concentration here.

Description

technical field [0001] The invention relates to a hollow buoyancy ball, in particular to a ceramic hollow buoyancy ball and a manufacturing method thereof, belonging to the fields of ceramics, buoyancy materials and marine technology. Background technique [0002] Countries around the world are probing deeper into the ocean. The United States has already developed a 10,000-meter-class submersible, and Japan and China are also developing it. Correspondingly, the pressure resistance and other performance requirements of buoyant materials are getting higher and higher. The strength of the material often means increasing the wall thickness, and the mass-to-volume ratio (hereinafter referred to as density) will also decrease accordingly, and the net buoyancy provided will decrease. For deep-sea equipment, there are two most important general-purpose materials, one is structural materials with sufficient pressure resistance, and the other is materials that can provide sufficient n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B37/00B24B19/00B63C11/52
CPCB24B19/00B63C11/52C04B37/001C04B2237/52C04B2237/525C04B2237/76C04B2237/78
Inventor 张培志何成贵吴芬韩伟月郭方全祁海
Owner SHANGHAI RES INST OF MATERIALS CO LTD
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