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Ceramic mobile-phone rear cover and preparation method thereof

A mobile phone back cover and ceramic technology, which is applied in the field of high-toughness ceramic mobile phone back cover and its preparation, can solve the problems of complex molding process, low toughness and strength, and failure to meet the fracture toughness of the mobile phone back cover, and achieve high dimensional accuracy.

Inactive Publication Date: 2018-02-09
广东百工新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But reference 1 has the following disadvantages: 1. In reference 1, sol-gel molding in wet molding is adopted, and a lot of organic matter needs to be added in the molding, and most of them are poisonous, and it is easy to deform and crack during debinding and sintering; 2. Comparison 1. The molding process is complicated, which is not conducive to low-cost mass production; 3. The toughness and strength of Comparative Document 1 are low, and the fracture toughness is 3.6-12.8MPa m 1 / 2 , the strength is 370-1020MPa, too low fracture toughness will cause the ceramic body to be too brittle, which cannot meet the fracture toughness requirements of the mobile phone back cover
However, the raw material used in this technology is nano-yttrium stabilized zirconia, which is costly
Moreover, this technology uses injection molding. If you want to injection mold the back cover of 2D and 3D mobile phones, you need complex molding mold design and expensive mold costs, which indirectly increases the molding cost.
In addition, the mobile phone back cover made by this technology has a bending strength of only 916-1134MPa and a fracture toughness of only 8.7-10.5MPa.m 1 / 2

Method used

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  • Ceramic mobile-phone rear cover and preparation method thereof
  • Ceramic mobile-phone rear cover and preparation method thereof
  • Ceramic mobile-phone rear cover and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0041]The invention provides a preparation method of a ceramic mobile phone back cover, comprising:

[0042] (1) Use a solvent to make yttria-stabilized zirconia powder into a suspension, add a dispersant to the suspension, add alumina powder, mix evenly and dry to obtain doped modified zirconia powder. Yttrium stabilized zirconia powder;

[0043] Using a solvent to formulate the alumina powder into a suspension, adding a dispersant and a sintering aid to the suspension, mixing uniformly and then drying to obtain a doped modified alumina powder;

[0044] The ceramic mobile phone back cover can use zirconia powder as the main raw material, and can also use alumina powder as the main raw material. When the ceramic mobile phone back cover uses zirconia powder as the main raw material, its raw material formula in parts by weight is as follows:

[0045]

[0046] The zirconia powder and alumina powder are made of sub-micron powder, and the cost is relatively low. Cooperating wit...

Embodiment example 1

[0075] (1) Formula

[0076]

[0077] (2) Preparation method

[0078] (1) Preparation of doped modified high-purity zirconia powder

[0079] Weigh the yttria-stabilized high-purity zirconia powder, use deionized water as the solvent, prepare the yttria-stabilized high-purity zirconia powder into a suspension with a solid content of 45%, and add BYK to the suspension to disperse agent, with Al(NO 3 ) 3 .6H 2 O way to join Al 2 o 3 . Then, using ZrO 2 50 kg of balls were used as the ball milling medium, milled in a ball mill tank for 12 hours, mixed evenly, and then spray-dried to obtain doped and modified high-purity zirconia powder.

[0080] (2) Atmospheric pressure and low temperature sintering

[0081] The modified zirconia powder obtained in step (1) was placed in a dry pressing mold, and formed by dry pressing at 30 MPa, and then placed in a cold isostatic press, and held at 150 MPa for 2 minutes to obtain a ceramic green body. The ceramic green body was transf...

Embodiment example 2

[0087] (1) Formula

[0088]

[0089] (2) Preparation method

[0090] (1) Preparation of doped modified high-purity zirconia powder

[0091] Weigh the yttria-stabilized high-purity zirconia powder, use deionized water as the solvent, prepare the yttria-stabilized high-purity zirconia powder into a suspension with a solid content of 50%, add BYK to the above suspension agent, with Al(NO 3 ) 3 .6H 2 O way to join Al 2 o 3 . Then, using ZrO 2 50 kg of balls were used as the ball milling medium, milled in a ball mill tank for 12 hours, mixed evenly, and then spray-dried to obtain doped and modified high-purity zirconia powder.

[0092] (2) Atmospheric pressure and low temperature sintering

[0093] The modified zirconia powder obtained in step (1) was placed in a dry pressing mold, and formed by dry pressing at 30 MPa, and then placed in a cold isostatic press, and held at 150 MPa for 2 minutes to obtain a ceramic green body. The ceramic green body was transferred to a...

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Abstract

The invention discloses a preparation method for a ceramic mobile-phone rear cover. The preparation method comprises the following steps: (1) preparing yttria-stabilized zirconia powder or alumina powder into a suspension with a solvent; (2) taking doped and modified yttria-stabilized zirconia powder or doped and modified alumina powder in a mold, carrying out dry-pressing molding, after completion of molding, carrying out placing into a cold isostatic press, and carrying out isostatic pressing so as to obtain a ceramic green body; (3) directly placing the ceramic green body into a sintering furnace, and carrying out sintering at a low temperature under normal pressure so as to obtain a ceramic pre-sintered body; (4) placing the ceramic pre-sintered body into a hot isostatic pressing sintering furnace, and carrying out secondary sintering so as to obtain a compact ceramic body; and (5) subjecting the ceramic body to CNC shape processing, rough grinding, fine grinding and polishing so as to obtain the ceramic mobile-phone rear cover. Correspondingly, the invention also discloses the ceramic mobile-phone rear cover prepared by adopting the above-mentioned method. By adopting the method provided by the invention, the ceramic mobile-phone rear cover has high strength, high toughness and high size precision.

Description

technical field [0001] The invention relates to the field of mobile phone back covers, in particular to a high-toughness ceramic mobile phone back cover and a preparation method thereof. Background technique [0002] Zirconia and alumina ceramics have a series of excellent properties such as high strength, high hardness, corrosion resistance, high temperature resistance, oxidation resistance, and good appearance color. In the field of cover, the brittleness of ceramics itself limits the reliability and safety of applications. How to improve the fracture toughness and drop resistance of ceramic materials is the key to the application in this field. Compared with metal materials and polymer materials, the preparation process of ceramics is more complicated, mainly including powder preparation, molding, sintering and back-end mechanical processing. Some micro-defects will inevitably be formed during the process, such as micro-cracks, small bubbles, If the impurities are equal,...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/10C04B35/622C04B35/64C04B35/645
CPCC04B35/10C04B35/48C04B35/622C04B35/64C04B35/6455C04B2235/3201C04B2235/3206C04B2235/3208C04B2235/3217C04B2235/3225C04B2235/3232C04B2235/3418C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96
Inventor 余明先李毅张耀辉
Owner 广东百工新材料科技有限公司
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