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Powder material for preparing high-strength high-toughness yttrium stabilized tetragonal polycrystal zirconia ceramics and preparation method of powder material

A technology for zirconia ceramics and powder materials, which is applied in the field of powder materials for preparing tetragonal polycrystalline zirconia ceramics and its preparation, can solve the problem that the performance of 3Y-TZP ceramics is not significantly improved, which is unfavorable to the development of zirconia powder technology and is difficult to achieve. Adapt to application needs and other issues to achieve the effect of obvious energy saving and emission reduction, easy promotion and application, and promotion of application and development

Active Publication Date: 2015-01-21
江西赛瓷材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the above research results of zirconia powder have played an effective role in promoting its application and development, with the rapid development of powder preparation technology, the performance of 3Y-TZP ceramics has not been significantly improved, but there is a problem of performance degradation. ; In particular, the fracture toughness gradually decreases, and the common products are less than 7MPa·m 1 / 2 , this phenomenon has not yet been explained and resolved
Therefore, the current zirconia materials are difficult to meet the current increasingly high application requirements, and it is not conducive to the development of zirconia powder technology.

Method used

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  • Powder material for preparing high-strength high-toughness yttrium stabilized tetragonal polycrystal zirconia ceramics and preparation method of powder material
  • Powder material for preparing high-strength high-toughness yttrium stabilized tetragonal polycrystal zirconia ceramics and preparation method of powder material
  • Powder material for preparing high-strength high-toughness yttrium stabilized tetragonal polycrystal zirconia ceramics and preparation method of powder material

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Embodiment 1

[0029] This embodiment is a method for preparing a powder material suitable for preparing high-strength and high-toughness yttrium-stabilized tetragonal polycrystalline zirconia ceramics. The steps are as follows:

[0030] (1) Zr 4+ Zirconium oxychloride solution with a concentration of 0.5mol / L is added to the reaction vessel, and then yttrium oxide is added in four times to form a reaction system; wherein the total amount of yttrium oxide added is Zr 4+ 2.0mol% of the total amount;

[0031] (2) Heating the reaction system to 50°C and keeping it warm for 2h until the yttrium oxide is dissolved, then adding 0.5wt% fatty acid and polyacrylic acid; then heating to 220°C and keeping it warm for 60h for hydrolysis-hydrothermal reaction, keeping the internal pressure at 3MPa, Make it gradually hydrolyze and precipitate;

[0032] (3) Filtrate the hydrolyzate, wash the filter residue repeatedly with deionized water, and then perform low-temperature calcination at a temperature of 6...

Embodiment 2

[0035] This embodiment is a method for preparing a powder material suitable for preparing high-strength and high-toughness yttrium-stabilized tetragonal polycrystalline zirconia ceramics. The steps are as follows:

[0036] (1) Zr 4+ Zirconium oxychloride solution with a concentration of 0.5mol / L is added to the reaction vessel, and then yttrium oxide is added in four times to form a reaction system; wherein the total amount of yttrium oxide added is Zr 4+ 2.3mol% of the total amount;

[0037](2) Heat the reaction system to 50°C, keep it warm for 2h until the yttrium oxide is dissolved, add 0.5wt% fatty acid and polyvinyl alcohol; then heat it to 180°C, keep it warm for 60h to carry out hydrolysis-hydrothermal reaction, and keep the internal pressure at 2MPa , making it gradually hydrolyzed and precipitated;

[0038] (3) Filtrate the hydrolyzate, wash the filter residue repeatedly with deionized water, and then perform low-temperature calcination at a temperature of 600°C for...

Embodiment 3

[0041] This embodiment is a method for preparing a powder material suitable for preparing high-strength and high-toughness yttrium-stabilized tetragonal polycrystalline zirconia ceramics. The steps are as follows:

[0042] (1) Zr 4+ Zirconium oxychloride solution with a concentration of 0.5mol / L is added to the reaction vessel, and then yttrium oxide is added in four times to form a reaction system; wherein the total amount of yttrium oxide added is Zr 4+ 1.4mol% of the total amount;

[0043] (2) Heat the reaction system to 50°C, keep it warm for 2h until the yttrium oxide is dissolved, then add 0.5wt% polyvinyl alcohol; then heat it to 200°C, keep it warm for 60h to carry out hydrolysis-hydrothermal reaction, keep the internal pressure at 2.5MPa, Make it gradually hydrolyze and precipitate;

[0044] (3) Filtrate the hydrolyzed solution, wash the filter residue repeatedly with deionized water, then perform low-temperature calcination at a temperature of 700°C for 2 hours and...

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Abstract

The invention discloses a powder material for preparing high-strength high-toughness yttrium stabilized tetragonal polycrystal zirconia ceramics. The powder material is prepared from zirconia and yttrium oxide, wherein the content of the yttrium oxide is 1.4-2.6mol% of the total amount of Zr<4+>; and the average grain size of raw crystal of the powder material is 50-110nm. Moreover, the invention further discloses a preparation method of the powder material. According to the zirconia powder material, the doping amount of yttrium is reduced, the tetragonal polycrystal ceramics prepared by using the powder are capable of realizing full tetragonal phase stable existence of zirconia at room temperature to guarantee the characteristic of high strength, activating the tetragonal phase in TZP (tetragonal zirconia polycrystalline), improving the transformation toughening performance and further optimizing the fracture toughness of TZP ceramics. The preparation method is safe and reliable, has the advantages of wide raw material source, low energy consumption and remarkable effect on energy conservation and emission reduction, is convenient for popularization and application, is suitable for industrial large-scale production, and can be used for effectively promoting application and development of zirconia materials.

Description

technical field [0001] The invention relates to the technical field of inorganic non-metallic materials, in particular to a powder material for preparing tetragonal polycrystalline zirconia ceramics and a preparation method thereof. Background technique [0002] Zirconia ceramics is a high-performance structural material. It is called "ceramic steel" because of its good mechanical properties, but the crystal phase change of zirconia is very special, that is, a tetragonal phase-monoclinic phase transition occurs at about 1100 °C. , and the crystal phase transition will produce a significant volume change, which is very unfavorable to zirconia ceramics, which is prone to cracking and cannot obtain a complete product. In order to avoid this situation, the existing technology adopts the method of reducing the tetragonal phase-monoclinic phase transition temperature of zirconia to below room temperature, that is, the stable tetragonal phase zirconia can be obtained at room temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/64
Inventor 刘琪沈志坚刘志毛翔鹏胡礼军
Owner 江西赛瓷材料有限公司
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