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Zirconia ceramic as well as preparation method and application thereof

A zirconia ceramic and zirconia technology are applied in the field of zirconia ceramics and their preparation to achieve the effects of low dielectric constant and density, good toughness and low dielectric constant

Active Publication Date: 2021-06-22
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of how to improve the dielectric constant and density of zirconia ceramics and have good toughness, and provide zirconia ceramics and its preparation method and application

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  • Zirconia ceramic as well as preparation method and application thereof

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preparation example Construction

[0023] The second aspect of the present invention provides a method of preparing zirconia ceramics comprising: (1) wet oligium oxide zirconia, niobium oxide and cordierite, and the dispersant and water, then The binder is formed, and the slurry is formed; (2) drying the slurry to obtain a composite zirconia powder; (3) performs the composite zirconia powder to be molded, and then sintered in air to obtain ceramics.

[0024] In the present invention, the oxide zirconia-containing zirconia, and the powder of niobium oxide and cordierite can be provided separately or in combination with high purity powder. For example, yttrium oxide, zirconia can be used to stabilize zirconia powder containing 1.5-4 mol% cerium oxide (0.3-0.6 μm in the particle size, 7-13m specific surface area) 2 / g), wherein the content of yttrium oxide is based on zirconia. Niobium oxide can be used in a niobium bismuth (particle diameter medium value of 8-10 μm) powder. Cordierite uses a powder having a particle...

Embodiment 1

[0047] Pentoxide (NB) 2 O 5 25 g, zirconia powder containing 3.2 mol% cerium oxide stabilized zirconia powder 855g, cordierite 120g, binder (polyvinyl alcohol) 77.78 g, dispersant (triethanolamine) 1 g.

[0048] Zirconia, cordierite, niobium bismuth, water, and dispersant are sandwiched in the sand mill, and the binder is added to form a slurry for spray, and the solid content is 25% by weight;

[0049] The slurry is fed into the spray column for spray drying (the air intake temperature is 250 ° C, the air is 110 ° C, the centrifugal rotation speed is 15 revolving per second) forms a spherical powder having a strong fluidity, and then drying (Tonname 200 tons of pressurized press using 8MPa oil pressure pressure);

[0050] The molded powder was sintered at 1320 ° C in the air.

[0051] The sintered product was polished and the laser was cut, that is, the final sample was made, and the size was the shape and size of the back cover, 150 * 75 * 0.6mm.

[0052] High-energy XRF detecti...

Embodiment 2

[0055] Pentoxide (NB) 2 O 5 25 g, containing 3.2 mol% cerium oxide stabilized zirconia powder 815g, cordierite 160g, binder (polyvinyl alcohol) 77.78 g, dispersing agent (triethanolamine) 1 g.

[0056] Zirconia, cordierite, niobium bismuth, water, and dispersant are sandwiched in the sand mill, and the binder is added to form a slurry for spray, and the solid content is 25% by weight;

[0057] The slurry is fed into the spray column for spray drying (the air intake temperature is 250 ° C, the air is 110 ° C, the centrifugal rotation speed is 15 revolving per second) forms a spherical powder having a strong fluidity, and then drying (Tonname 200 tons of pressurized press using 8MPa oil pressure pressure);

[0058] The molded powder was sintered at 1320 ° C in the air.

[0059] The sintered product was polished and the laser was cut, that is, the final sample was made, and the size was the shape and size of the back cover, 150 * 75 * 0.6mm.

[0060] A high-energy XRF detection was c...

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Abstract

The invention relates to the field of zirconia ceramic, and discloses zirconia ceramic as well as a preparation method and application thereof. The zirconium oxide ceramic comprises the following elements: Y, Zr, Mg, Al, Si and Nb, and the phase of the zirconium oxide ceramic comprises monoclinic phase zirconium oxide, tetragonal phase zirconium oxide, zirconium silicate and cordierite. The zirconium oxide ceramic comprises the following components in percentage by element: 50.6 to 61.1 percent by weight of Zr, 5.1 to 12.6 percent by weight of Al, Mg and Si, 3.2 to 3.9 percent by weight of Y, and 0.3 to 2.7 percent by weight of Nb. The phase of the zirconia ceramic comprises 60 to 80 percent by weight of monoclinic phase zirconium oxide, 3 to 30 percent by weight of tetragonal phase zirconium oxide, 8 to 22 percent by weight of cordierite and 0.5 to 3 percent by weight of zirconium silicate. The zirconia ceramic can simultaneously have the characteristics that the dielectric constant is less than 30, the density is less than 5.40 g / cm < 3 >, and the toughness is greater than 6.5 MPam 0.5, and can be used for a mobile phone backboard with low dielectric constant, low density and good toughness.

Description

Technical field [0001] The present invention relates to the field of zirconia ceramic, and more particularly to zirconia ceramics and preparation methods and applications thereof. Background technique [0002] The zirconia-based ceramic material has excellent toughness, strength, oxidation, corrosion resistance, abrasion resistance, etc., as a wide range of applications as functional ceramics and structural ceramics. However, with the arrival of 5g, the backplane of zirconia ceramic mobile phone has a large weight, high dielectric constant, and has a large problem of processing difficulty, limiting the application of zirconia ceramics in 5G mobile phone. [0003] It has been technically to reduce the density and dielectric constant of the zirconia-based ceramic material by adding alumina. However, the addition of alumina causes the hardness of the material and the decrease in toughness, and improves processing costs. Therefore, it is very important to develop a low density, low d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/622H04M1/02
CPCC04B35/48C04B35/622H04M1/0202C04B2235/3251C04B2235/3225C04B2235/3481C04B2235/602C04B2235/656C04B2235/6567C04B2235/77C04B2235/96C04B2235/94C04B2235/95
Inventor 唐威林信平陈戈
Owner BYD CO LTD
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