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Zirconia ceramics and its preparation method and application

A technology of zirconia ceramics and zirconia, applied in the field of zirconia ceramics and its preparation, can solve the problems of increased processing difficulty, high density, high cost, etc., and achieve the effect of low dielectric constant and good comprehensive performance

Active Publication Date: 2022-01-07
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its toughness (up to 5-6MPa m 1 / 2 ) is higher than other conventional ceramics, but it has the disadvantage of weak impact resistance when made into large-area appearance parts
In addition, when it is prepared into a mobile phone back cover product, it has the problem of heavy weight caused by high density and signal transmission problem caused by high dielectric constant.
In response to these problems, some manufacturers reduce the density and dielectric constant by adding more alumina, but the high hardness and brittleness of alumina will greatly increase the processing difficulty, resulting in low yield and high cost, making production unsatisfactory. possible

Method used

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  • Zirconia ceramics and its preparation method and application

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[0027] The second aspect of the present invention provides a method for preparing zirconia ceramics, including: (1) adding niobium oxide and / or tantalum oxide, and zirconium oxide, yttrium oxide, zinc aluminate and / or magnesium aluminate, zirconium silicate The powder is wet-milled with water, dispersant and binder to obtain a slurry; (2) drying the slurry to obtain a composite zirconia powder; (3) molding the composite zirconia powder , and then sintered in air to obtain ceramics.

[0028] In the present invention, the powders of niobium oxide, tantalum oxide, zirconium oxide, yttrium oxide, zinc aluminate and / or magnesium aluminate, and zirconium silicate can be provided alone or in combination in the form of high-purity powder. For example, yttria and zirconia can be stabilized by tetragonal zirconia powder containing 2-4mol% yttrium oxide (median particle size 0.3-0.6μm, specific surface area 7-13m 2 / g), wherein the content of yttrium oxide is based on zirconia. Niobium...

Embodiment 1

[0054] Raw materials: 200g of composite powder, which contains niobium pentoxide (Nb 2 o 5 ) 2.5wt%, zinc aluminate (ZnAl 2 o 4 ) 12.3wt%, zirconium silicate 22.3wt%, 62.9wt% zirconia powder containing 3mol% yttria stabilized.

[0055] The raw material is added water ball milling 8h in the ball mill tank, then in the sand mill, add 0.02wt% hypromellose and water sand milling 10h, finally add the binding agent of 4wt% powder (molar ratio is 1: 1 PEG4000 and PVA) were stirred for 0.5h to form a spray slurry with a solid content of 25% by weight;

[0056] The slurry is sent to the spray tower for spray drying (inlet air temperature is 250°C, outlet air temperature is 110°C, centrifugal speed is 15 rpm) to form a spherical powder with strong fluidity for dry pressing, and then dry pressing (A press with a tonnage of 200 tons uses an oil pressure of 8MPa);

[0057] The molded powder is heated from room temperature to 600°C for 400 minutes and kept for 2 hours, raised from 600°...

Embodiment 2

[0062] Raw materials: 200g of composite powder, which contains niobium pentoxide (Nb 2 o 5 ) 2.5wt%, magnesium aluminate (MgAl 2 o 4 ) 12.3wt%, zirconium silicate 22.3wt%, 62.9wt% yttria-stabilized zirconia powder containing 3mol%.

[0063]Add water ball mill to raw material in ball mill tank for 8h, then add 0.01wt% triethanolamine and water sand mill in sand mill for 10h, finally add 5wt% binder of powder (mole ratio is PEG4000 of 1:1 and PVA) to stir for 0.5h to form a spray slurry with a solid content of 55% by weight;

[0064] The slurry is sent to the spray tower for spray drying (inlet air temperature is 250°C, outlet air temperature is 110°C, centrifugal speed is 15 rpm) to form a spherical powder with strong fluidity for dry pressing, and then dry pressing (A press with a tonnage of 200 tons uses an oil pressure of 8MPa);

[0065] The molded powder is heated from room temperature to 600°C for 400 minutes and kept for 2 hours, raised from 600°C for 300 minutes to ...

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Abstract

The invention relates to the field of zirconia ceramics, and discloses a zirconia ceramic, a preparation method and application thereof. The zirconia ceramics include: Y, Zr, Zn, Al, Si, Mg, and Nb and / or Ta in terms of elements, and the phases of the zirconia ceramics include: tetragonal zirconia, ZrSiO 4 and Zn x Mg 1‑x al 2 o 4 , wherein, 0≤x≤1; the tetragonal zirconia is a solid solution of yttrium oxide, niobium oxide and / or tantalum oxide and zirconia. The zirconia ceramics can simultaneously have a dielectric constant of less than 28 and a density of less than 5.5g / cm 3 , the thinning speed is greater than 40 filaments / h, the falling weight height is greater than 24cm, and the comprehensive performance is better than that of the ceramics in the prior art.

Description

technical field [0001] The invention relates to the field of zirconia ceramics, in particular to zirconia ceramics and a preparation method and application thereof. Background technique [0002] Zirconia ceramics are widely used because of their good corrosion resistance, high hardness and high strength. Its toughness (up to 5-6MPa m 1 / 2 ) Although it is higher than other conventional ceramics, it has the disadvantage of weak impact resistance when it is made into large-area appearance parts. In addition, when it is prepared into a mobile phone back cover product, it has the problem of heavy weight caused by high density and signal transmission problem caused by high dielectric constant. In response to these problems, some manufacturers reduce the density and dielectric constant by adding more alumina, but the high hardness and brittleness of alumina will greatly increase the processing difficulty, resulting in low yield and high cost, making production unsatisfactory. po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C04B35/622H04M1/18
CPCC04B35/48C04B35/622H04M1/18C04B2235/3251C04B2235/3222C04B2235/3427C04B2235/3246C04B2235/3225
Inventor 陈戈林信平唐威
Owner BYD CO LTD
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