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Tetragonal zirconia based composite ceramic ultrathin cover plate and preparation process thereof

A composite ceramic and zirconia-based technology, which is applied in the field of square zirconia-based composite ceramic ultra-thin cover plates and its preparation, can solve the problems of high sintering temperature, low solid content, and easy deformation of thin plates, and achieve excellent mechanical properties and flatness The effect of high precision and low cost

Inactive Publication Date: 2017-05-10
SHANTOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a square zirconia-based composite ceramic ultra-thin cover plate and its low-temperature sintering preparation process to solve the problems of traditional zirconia ceramics such as high sintering temperature, easy deformation of the thin plate, and low solid content.

Method used

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  • Tetragonal zirconia based composite ceramic ultrathin cover plate and preparation process thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] According to the total amount of 63g ceramic material, calculate the dosage of 0.08μm square zirconia powder with a particle size of 0.08μm and pure alumina powder with a particle size of 1μm in a volume ratio of 70:30, and weigh them separately; add 26.75g of methyl ethyl ketone and ethanol mixed solvent and 2g of triolein dispersant, ball mill and mix for 24 hours. After ball milling, 5g of styrene-acrylic emulsion binder and 3.25g of glycerol plasticizer were added, and ball milling was continued for 6 hours. Then add 0.05g of defoaming agent and defoam in a vacuum stirred tank for 20 minutes to obtain a ceramic slurry with a solid content of 63%. The resulting ceramic slurry was cast on a casting machine and dried for 15 minutes in the main drying zone of the casting machine at 120°C to obtain a ceramic green tape. Finally, the ceramic green tape was cut and put into a sintering bowl box at 1300°C After sintering for 3 hours, the tetragonal zirconia-based composite ...

Embodiment 2

[0022] According to the total amount of 65g ceramic material, calculate the amount of 0.4μm square zirconia powder and 3μm square zirconia powder with a volume ratio of 50:50, and weigh them separately; add 25.75g methyl ethyl ketone and ethanol mixed solvent and 2g triolein dispersant, ball mill and mix for 15h. After ball milling, 4.25 g of styrene-acrylic emulsion binder and 3 g of glycerin plasticizer were added, and ball milling was continued for 5 hours. Then add 0.05g of defoaming agent and defoam in a vacuum stirred tank for 20 minutes to obtain a ceramic slurry with a solid content of 65%. The resulting ceramic slurry was cast on a casting machine and dried in the main drying zone of the casting machine at 120°C for 15 minutes to obtain a ceramic green tape. Finally, the ceramic green tape was cut and put into a sintering bowl box at 1500°C After sintering for 2 hours, the ultra-thin zirconia-based composite ceramic cover plate with cross-scale structure according to ...

Embodiment 3

[0024] According to the total amount of ceramic material 70g, calculate the dosage of 0.5μm square zirconia powder with a particle size of 0.5μm and pure aluminum nitride powder with a particle size of 3μm in a 40:60 volume ratio; add 22.6g methyl ethyl ketone and ethanol mixed solvent And 2g triolein dispersant, ball mill and mix for 12h. After ball milling, 3g of styrene-acrylic emulsion binder and 2.4g of glycerol plasticizer were added, and ball milling was continued for 2h. Then add 0.05g of defoaming agent, and defoam in a vacuum stirred tank for 30 minutes to obtain a ceramic slurry with a solid content of 70%. The resulting ceramic slurry was cast on a casting machine and dried in the main drying zone of the casting machine at 120°C for 15 minutes to obtain a ceramic green tape. Finally, the ceramic green tape was cut and put into a sintering bowl box at 1500°C After sintering for 3 hours, the tetragonal zirconia-based composite ceramic ultra-thin cover plate with cros...

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Abstract

The invention relates to a tetragonal zirconia based composite ceramic ultrathin cover plate and a preparation process thereof, and belongs to the field of preparation of fine ceramics. Ceramic powder of the composite ceramic ultrathin cover plate is a trans-scale mixture formed by nanometer zirconia powder and micrometer powder, wherein the nanometer zirconia powder accounts for 40-70% of the ceramic powder in volume. The preparation process comprises the following steps: adding appropriate dispersing agent, adhesive, plasticizer and defoamer into raw materials to prepare ceramic slurry; preparing an ultrathin ceramic green tape of which the solid content is above 63% through a tape casting process; then cutting and shaping; and preparing the ultrathin composite ceramic cover plate with high flatness and controllable shrinkage ratio for a fingerprint identification function through a special sintering pot. Compared with the existing fingerprint cover plate, the composite ceramic ultrathin cover plate prepared by the invention has low sintering temperature and favorable electrical and mechanical properties, satisfies the performance requirements of fingerprint identification for high sensitivity, drop resistance, wear resistance and ultrathinness, is low in cost, and has an important practical meaning.

Description

Technical field [0001] The invention relates to a tetragonal zirconia-based composite ceramic ultra-thin cover plate and a preparation process thereof, and belongs to the field of fine ceramic preparation. Background technique [0002] Fingerprint recognition modules are widely used in smart portable devices due to their advantages such as fast, safe, and convenient. However, due to the small area of ​​fingerprint modules and complex application environments, they require high recognition sensitivity and speed. Surface protection materials have also put forward very high requirements. At present, there are four types of fingerprint recognition cover plates commonly used: sapphire, coated, glass and ceramic. Among them, sapphire has high hardness and corrosion resistance, but the cost is high; the coated type has the disadvantages of being easy to wear and corroded by sweat due to the low hardness of the coating, and has poor aesthetics; tempered glass has low cost, but its dielec...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/486C04B35/626C04B35/632
CPCC04B35/48C04B35/486C04B35/6261C04B35/632C04B2235/5436C04B2235/5445C04B2235/5454
Inventor 王双喜蓝海凤张伟黄永俊李少杰
Owner SHANTOU UNIV
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