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Dielectric Ceramic Materials

A technology of dielectric ceramics and barium titanate, applied in the field of dielectric ceramic materials, can solve the problems of poor wear resistance, low dielectric constant, poor bonding force, etc., and achieve good wear resistance, dielectric constant, and uniform material. Compact, easy to formulate and process results

Active Publication Date: 2020-05-05
DONGGUAN XINBO STRUCTURAL CERAMICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of sapphire is high, and the dielectric constant is not very ideal (the dielectric constant of sapphire is 9-11), and because of its high hardness, processing is difficult and the production cost is high
The glass dielectric cover plate has problems such as poor wear resistance, low strength, and low dielectric constant. In view of this, coatings and coatings are currently used to solve the problems of poor wear resistance and low dielectric constant. However, due to the coating There will be a difference in thermal expansion coefficient between the coating and the coating, resulting in problems such as poor bonding between materials

Method used

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Experimental program
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preparation example Construction

[0026] The preparation method of the barium titanate composition is as follows: after mixing the titanium tetrachloride solution and the refined barium chloride solution, add oxalic acid (the molar ratio is TiCl 4 : BaC1 2 :H 2 C 2 o 4 2H 2 O is 1:1:2) to react to form barium titanyl oxalate precipitate, according to the molar ratio of barium titanate, magnesium oxide and calcium oxide is 10~20:2~3:0.8~1.5, to precipitate barium titanyl oxalate Add the corresponding amount of magnesium hydroxide and calcium hydroxide (the molar weight of magnesium hydroxide is equal to the molar weight of magnesium oxide, and the molar weight of calcium hydroxide is equal to the molar weight of calcium oxide), mix well, then filter, wash, dry, Calcining at 700-1000° C., and then sieving to obtain a barium titanate composition with a particle size of 0.8-2 μm.

[0027] The particle size of the barium titanate composition is 0.8-2 μm. When the particle size of the barium titanate compositio...

Embodiment 1

[0037] The dielectric ceramic material of this embodiment is used to prepare a fingerprint identification cover. The dielectric ceramic material includes the following components in parts by weight:

[0038]

[0039] The barium titanate composition is a mixture of barium titanate, magnesium oxide and calcium oxide, and the molar ratio of barium titanate, magnesium oxide and calcium oxide is 20:3:0.8.

[0040] The preparation method of the barium titanate composition is as follows: after mixing the titanium tetrachloride solution and the refined barium chloride solution, at 80°C, add oxalic acid (the molar ratio is TiCl 4 : BaC1 2 :H 2 C 2 o 4 2H 2 O is 1:1:2) to react to form a barium titanyl oxalate precipitate. According to the molar ratio of barium titanate, magnesium oxide and calcium oxide is 20:3:0.8, add a corresponding amount of hydroxide to the barium titanyl oxalate precipitate Magnesium and calcium hydroxide are uniformly mixed, then filtered, washed, dried...

Embodiment 2

[0051] The dielectric ceramic material of this embodiment is used to prepare a fingerprint identification cover. The dielectric ceramic material includes the following components in parts by weight:

[0052] 105 parts of zirconia;

[0053] 2 parts of barium titanate composition;

[0054] 12 parts of binder.

[0055] The barium titanate composition is a mixture of barium titanate, magnesium oxide and calcium oxide, and the molar ratio of barium titanate, magnesium oxide and calcium oxide is 18:2.8:1.

[0056] The preparation method of the barium titanate composition is: after mixing the titanium tetrachloride solution and the refined barium chloride solution, at 85°C, add oxalic acid (the molar ratio is TiCl 4 : BaC1 2 :H 2 C 2 o 4 2H 2 O is 1:1:2) to react to form a barium titanyl oxalate precipitate. According to the molar ratio of barium titanate, magnesium oxide and calcium oxide is 18:2.8:1, add a corresponding amount of hydroxide to the barium titanyl oxalate prec...

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Abstract

The invention relates to a dielectric ceramic material, which is prepared from the following ingredients in parts by weight: 100 to 120 parts of zirconia, 1 to 6 parts of barium titanate compositions,10 to 20 parts of bonding agents and 0 to 5 parts of plasticizing agents, wherein the barium titanate composition is a mixture of barium titanate, magnesium oxide and calcium oxide. For the dielectric ceramic material, after the magnesium oxide and the calcium oxide are mixed into the barium titanate, the Curie temperature of the dielectric ceramic material moves to high temperature and reaches about 190 DEG C; the Curie peak is expanded; the dielectric constant of the dielectric ceramic material is improved; the performance of fracture toughness, bending strength, abrasive resistance, hardness and the like is good. Compared with sapphire, the dielectric ceramic material has the advantages that the ingredients are simple; the cost is lower; the preparation and the processing are easy; theproduction cost is reduced; the material is uniform and compact; good abrasive resistance and dielectric constant can be realized without film plating or coating.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to dielectric ceramic materials. Background technique [0002] With the development of electronic product security technology, more and more electronic products have fingerprint recognition function, especially the smart phones we use every day. As a fingerprint identification module for mobile phones, it needs to have sensitive fingerprint identification speed and wear resistance. Traditional fingerprint identification modules are mostly capacitive fingerprint identification chips, and the dielectric cover of the chip is mainly made of sapphire, glass, etc. However, the cost of sapphire is relatively high, and the dielectric constant is not ideal (the dielectric constant of sapphire is 9-11), and because of its high hardness, processing is difficult and the production cost is high. The glass dielectric cover plate has problems such as poor wear resistance, low strength,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C04B35/626C04B35/632C04B35/634
CPCC04B35/48C04B35/62605C04B35/62645C04B35/632C04B35/63404C04B35/63408C04B2235/3206C04B2235/3208C04B2235/3236C04B2235/96
Inventor 周光辉陈宏裕王文利孙亮
Owner DONGGUAN XINBO STRUCTURAL CERAMICS CO LTD