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Ceramic mobile phone shell and preparation method thereof

A mobile phone shell and ceramic technology, which is applied to ceramic molding machines, manufacturing tools, branch equipment, etc., can solve the problems of high processing cost, long production cycle, and reduced fracture toughness of ceramics, so as to meet the needs of large-scale production, improve production efficiency, The effect of reducing product cost

Inactive Publication Date: 2017-07-28
广东百工新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent prepares the casting film by tape casting, and then prepares the ceramic mobile phone shell through lamination, debinding and sintering, CNC, grinding and polishing processes, but this process requires CNC processing after sintering, the production cycle is long, and complex shapes such as 3D are formed. Sometimes the back-end processing is difficult and the cost of back-end processing is high
The existing conventional method is to directly make a mobile phone shell block, and process four-sided arcs through machining (CNC). Due to the high hardness of ceramics, such processing costs are very high.
In addition, the normal pressure sintering process takes a long time, and the sintering temperature is too high, which leads to the easy growth of grains, and the final fracture toughness of ceramics is reduced.

Method used

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  • Ceramic mobile phone shell and preparation method thereof
  • Ceramic mobile phone shell and preparation method thereof
  • Ceramic mobile phone shell and preparation method thereof

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preparation example Construction

[0039] The invention provides a method for preparing a ceramic mobile phone shell, comprising:

[0040] (1) Dissolve submicron ceramic powder, dispersant, binder and plasticizer in an organic solvent, and perform ball milling to form a uniform slurry;

[0041] The submicron ceramic powder contains at least one of zirconia and alumina, and the zirconia contains 1-8wt% yttrium oxide. The particle size of the submicron ceramic powder is 0.1-0.5 μm. Preferably, the zirconia contains 2-5wt% yttrium oxide. The particle size of the submicron ceramic powder is 0.2-0.4 μm. The particle size of the powder is set at 0.1-0.5 μm, which is set according to the tape casting process and the performance of the finished product after sintering. The particle size of the powder is too fine, and the solid content of the casting slurry is too low, resulting in easy deformation, cracking, and incomplete firing during sintering. If the particle size of the powder is too large, on the one hand, th...

Embodiment 1

[0071] (1) Slurry preparation: Dissolve 10kg of zirconia powder in a mixed solvent of 5kg of butanone and absolute ethanol, the mass ratio of butanone and absolute ethanol is 3:2, add 80g of BYK dispersant, and ball mill first 5h, then add 825g of binder and 536g of plasticizer, the binder is polyvinyl butyral, the plasticizer is dioctyl phthalate, and ball milled for 24h to form a uniform slurry.

[0072] (2) Tape casting: The slurry in step (1) was vacuum defoamed to a vacuum degree of 0.1 MPa for 15 hours, and tape cast to prepare a 0.2 mm cast film.

[0073] (3) Differential Laminations: Combining Figure 1 Divide the casting diaphragm in step (2) into diaphragms that match the size and shape of the die, including the differential diaphragm for the main body of the shell and the differential diaphragm for the frame of the shell;

[0074] Spray release agent on the mold;

[0075] Stacking the differential diaphragm of the shell frame on the boss of the first mold, and sup...

Embodiment 2

[0080] (1) Slurry preparation: Dissolve 10kg of zirconia powder in a mixed solvent of 5kg of xylene and absolute ethanol, the mass ratio of xylene and absolute ethanol is 4:1, add 80g of BYK dispersant, and ball mill first 5h, then add 825g of binder and 742g of plasticizer, the binder is polyvinyl butyral, the plasticizer is butyl benzyl phthalate, and ball milled for 24h to form a uniform slurry.

[0081] (2) Tape casting: The slurry in step (1) was vacuum defoamed to a vacuum degree of 0.1 MPa for 15 hours, and tape cast to prepare a 0.2 mm cast film.

[0082] (3) Differential Laminations: Combining Figure 1 Divide the casting diaphragm in step (2) into diaphragms that match the size and shape of the die, including the differential diaphragm for the main body of the shell and the differential diaphragm for the frame of the shell;

[0083] Spray silicone oil on the mold;

[0084] Stacking the differential diaphragm of the shell frame on the boss of the first mold, and sup...

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Abstract

The invention discloses a ceramic mobile phone shell preparation method which includes the steps: (1) dissolving submicron ceramic powder, dispersing agents, binding agents and plasticizers into organic solvents, and performing ball-mill mixing on mixture to form uniform slurry; (2) performing vacuum defoaming and tape-casting treatment on the slurry to obtain casting film wafers; (3) designing molds according to the shapes and the sizes of products, performing differentiation on the casting film wafers to form differential film wafers with corresponding shapes and sizes, stacking the differential film wafers on the molds, and performing vacuum packaging sealing and isostatic pressing treatment on the differential film wafers stacked on the molds to obtain green bodies; (4) performing glue coating and sintering on the green bodies to obtain ceramic wafers with preset shapes and sizes; (5) grinding and polishing the ceramic wafers to obtain ceramic mobile phone shells. The invention further discloses a ceramic mobile phone shell prepared by the method. According to the preparation method, subsequent machining amount is less, production efficiency is greatly improved, and product cost is reduced.

Description

technical field [0001] The invention relates to the field of appearance of mobile phones, in particular to a ceramic mobile phone casing and a preparation method thereof. Background technique [0002] As an important structural part, the mobile phone casing needs to have the characteristics of high strength, wear resistance, good appearance, and low electromagnetic shielding. At present, most of the mobile phone casings are made of glass, engineering plastics and metal materials. The glass material is fragile, not wear-resistant, and easy to scratch. The engineering plastic has poor texture and fades and is not environmentally friendly. The metal material has low hardness and is more shielding against electromagnetic signals. Ceramic materials have attracted more and more attention due to their excellent properties such as high strength, high hardness, oxidation resistance, and corrosion resistance, especially as structural parts such as mobile phone casings, which do not a...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/10C04B35/632C04B35/634C04B35/638B28B1/29H04M1/18
CPCB28B1/29C04B35/10C04B35/48C04B35/632C04B35/6342C04B35/638C04B2235/77C04B2235/945C04B2235/96H04M1/185
Inventor 余明先吴沙鸥刘继红李毅张耀辉
Owner 广东百工新材料科技有限公司
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