Yttria-stabilized zirconia ceramic and preparation method thereof

A technology for stabilizing zirconia and yttria, applied in the field of ceramics, can solve the problems of reducing the light transmittance, strength and toughness of yttria-stabilized zirconia ceramics, and coarsening the grain size of ceramics.

Active Publication Date: 2018-03-06
INNER MONGOLIA UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

[0003] At present, yttria-stabilized zirconia ceramics mostly prepare ceramic powder by co-precipitation method, and then obtain ceramic materials by sintering. Sintering, but higher sin...

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  • Yttria-stabilized zirconia ceramic and preparation method thereof
  • Yttria-stabilized zirconia ceramic and preparation method thereof
  • Yttria-stabilized zirconia ceramic and preparation method thereof

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preparation example Construction

[0041] The invention provides a method for preparing yttria-stabilized zirconia ceramics, comprising the following steps:

[0042] (1) Provide nano-ceramic powders comprising zirconia, yttrium oxide and alumina;

[0043] (2) Pressing the nano-ceramic powder to obtain a ceramic green body;

[0044] (3) firing the ceramic body obtained in the step (2) to obtain yttria-stabilized zirconia ceramics;

[0045] The calcination temperature is 1350-1520°C.

[0046] The invention provides nano ceramic powder comprising zirconia, yttrium oxide and aluminum oxide. In the present invention, the particle size of the nano-ceramic powder is preferably 100 nm or less, more preferably 80 nm or less, and more preferably 20-75 nm.

[0047] In the present invention, the mass ratio of zirconia, yttrium oxide and alumina in the nano-ceramic powder is preferably (942-952): (45-58): (1-5), more preferably (948-950): (50-52): (2-4), more preferably 948:52:3.

[0048] In the present invention, the ...

Embodiment 1

[0079] Based on the total mass of zirconia and yttrium oxide as 1000 parts, accurately weigh 942 parts of zirconia, 58 parts of yttrium oxide, 1 part of aluminum oxide, 2 parts of polyammonium methacrylate as a dispersant, add distilled water, and adjust the solid content of the slurry to 55%, the material is milled for 2 hours by a stirring ball mill, the grinding body is a zirconia ball with a particle size of 5-6mm, and the milling speed is 160r / min;

[0080] The slurry after stirring ball milling is introduced into the sand mill, and the solid content of the slurry is adjusted to 35% by adding deionized water, and the grinding body is zirconia beads with a particle size of 0.6-0.8 mm as the grinding body, and sanded for 6 hours, Sanding speed is 2000r / min;

[0081] Spray and dry the sand-milled slurry, adjust the atomization frequency to 45Hz, the air inlet temperature to 240°C, and the air outlet temperature to 90°C to obtain nano-ceramic powders with a particle size belo...

Embodiment 2

[0085] Based on the total mass of zirconia and yttrium oxide as 1000 parts, accurately weigh 945 parts of zirconia, 55 parts of yttrium oxide, 2 parts of aluminum oxide, 4 parts of dispersant polyammonium methacrylate, add distilled water, and adjust the solid content of the slurry to 58%, the material is milled for 4 hours by a stirring ball mill, the grinding body is a zirconia ball with a particle size of 7-8mm, and the milling speed is 140r / min;

[0086] The slurry after stirring ball milling is introduced into the sand mill, and the solid content of the slurry is adjusted to 40% by adding deionized water. The grinding body is zirconia beads with a particle size of 0.5-0.6 mm as the grinding body, and sanded for 5 hours. Sanding speed is 2100r / min;

[0087] The sand-milled slurry is directly dried in an electric oven at 90° C. for 12 hours to obtain nano-ceramic powder with a particle size of 100 nm or less. Field emission electron microscopy was carried out on the prepar...

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Abstract

The invention provides an yttria-stabilized zirconia ceramic and a preparation method thereof. The preparation method disclosed by the invention comprises the following steps: providing nano-ceramic powder containing zirconia, yttria and alumina; pressing the nano-ceramic powder to obtain a ceramic body; and calcining the obtained ceramic body, thereby obtaining the yttria-stabilized zirconia ceramic, wherein the calcination temperature is 1350-1520 DEG C. According to the yttria-stabilized zirconia ceramic and the preparation method thereof disclosed by the invention, the alumina is added inthe preparation process of the yttria-stabilized zirconia ceramic, and because one of the alumina is segregated to a crystal boundary of the ceramic structure, growth of ceramic grains can be hindered, the ceramic sintering temperature is effectively reduced, the effect of refining the ceramic grains is achieved, and the light transmittance and mechanical property of the ceramic are further improved.

Description

technical field [0001] The invention relates to the technical field of ceramics, in particular to a yttria-stabilized zirconia ceramic and a preparation method thereof. Background technique [0002] Zirconia ceramic materials are widely used in many fields due to their excellent mechanical properties, corrosion resistance, biocompatibility, aesthetics, high thermal expansion coefficient, low thermal conductivity and high chemical stability, such as dental materials, human body Bone, ceramic knives, abrasive media and thermal barrier coatings. In particular, the demand for yttria-stabilized zirconia ceramics with more excellent stability, corrosion resistance and thermal properties has increased dramatically. [0003] At present, yttria-stabilized zirconia ceramics mostly prepare ceramic powder by co-precipitation method, and then obtain ceramic materials by sintering. Sintering is carried out, but the higher sintering temperature will inevitably coarsen the ceramic grain s...

Claims

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Application Information

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IPC IPC(8): C04B35/488C04B35/622C04B35/626
CPCC04B35/4885C04B35/622C04B35/6261C04B2235/3225C04B2235/3246C04B2235/5454C04B2235/656C04B2235/77C04B2235/96C04B2235/9646
Inventor 宋希文张永和包金小谢敏周芬郜建全安胜利郭文荣
Owner INNER MONGOLIA UNIV OF SCI & TECH
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