Fine-grain pink ZTA ceramic and preparation method thereof

A fine-grain, pink technology, applied in the field of fine-grain pink ZTA ceramics and its preparation, can solve the problems of ceramic grain growth, uneven distribution, and reduction of material strength and toughness

Inactive Publication Date: 2020-10-27
XIANGYA HOSPITAL CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the pink ZTA obtained by conventional powder metallurgy preparation methods has the following problems: (1) The ultrafine zirconia and alumina powders are unevenly distributed during the ball milling process, resulting in direct contact of single-phase grains and merging and growth, making The grains in the final sintered structure are coarse; (2) The dense structure needs to be formed at a higher temperature, which is easy to accelerate the growth of ceramic grains and reduce the overall performance of the material; (3) The zirconia or coarse zirconia in contact with each other It is easy to undergo aging phase transition or stress phase transition, and the generation of microcracks reduces the strength and toughness of the material

Method used

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  • Fine-grain pink ZTA ceramic and preparation method thereof
  • Fine-grain pink ZTA ceramic and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0048] The raw material powder used in this embodiment includes 68 parts by weight of alumina, 30 parts of 2 moles of yttria-stabilized zirconia (2YSZ), 1.8 parts of strontium carbonate and 0.3 parts of dichromium trioxide. Among them, the average particle size of alumina powder is 0.30 μm, the average particle size of 2YSZ is 0.08 μm, and the average particle size of chromium trioxide powder is 0.70 μm. The preparation method steps of this embodiment are as follows:

[0049] (1) Preparation of ZTA slurry. Add an appropriate amount of ammonia water to adjust the pH value of the water between 9.5; add ammonium polyacrylate accounting for 0.6% of the total powder weight; then add the raw material powder to the ball milling medium so that the volume of the raw material powder accounts for 35% of the total volume of the water and the powder, and then Add polyvinyl alcohol accounting for 3% of the weight of the raw material powder; after ball milling for 60 hours, a low-viscosity ...

Embodiment 2

[0056] The raw material powder that present embodiment adopts comprises the aluminum oxide that parts by weight are 74, 24 parts of 3 moles of yttrium oxide stabilized zirconia (3YSZ), the calcium carbonate of 0.7 part, the magnesium carbonate of 0.5 part and the dichromium trioxide of 0.5 part . Among them, the average particle size of alumina powder is 0.20 μm, the average particle size of 3YSZ is 0.08 μm, and the average grain size of chromium trioxide powder is 0.50 μm. The preparation method steps of this embodiment are as follows:

[0057] (1) Preparation of ZTA slurry: add an appropriate amount of ammonia water to adjust the pH value of the water between 9.5; add diammonium citrate accounting for 0.4% of the total powder weight; then add the raw material powder to the ball milling medium, so that the volume of the raw material powder occupies 30% of the total volume of water and powder, and then adding polyvinyl alcohol accounting for 2% of the weight of the raw materi...

Embodiment 3

[0064] The raw material powder used in this embodiment includes 80 parts by weight of alumina, 18 parts of 3 mole yttria-stabilized zirconia (3YSZ), 1.5 parts of strontium carbonate and 0.5 parts of dichromium trioxide. Among them, the average particle size of alumina powder is 0.25 μm, the average particle size of 3YSZ is 0.15 μm, and the average grain size of chromium trioxide powder is 0.20 μm. The preparation method steps of this embodiment are as follows:

[0065] (1) Preparation of ZTA slurry: add an appropriate amount of ammonia water to adjust the pH value of the water to 10.5; add ammonium polyacrylate accounting for 0.8% of the total powder weight; then add the raw material powder to the ball milling medium so that the volume of the raw material powder accounts for the volume of the water and the powder 35% of the total volume, and then add polyvinyl alcohol accounting for 2% of the weight of the raw material powder; after ball milling for 60 hours, a low-viscosity Z...

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Abstract

The invention discloses a preparation method of fine-grain pink ZTA ceramic. The preparation method comprises the following steps of: mixing aluminum oxide, yttria-stabilized zirconia, carbonic acid and a chromium source to obtain mixed powder; adding the mixed powder into an alkaline solution containing an anionic dispersant; obtaining a mixture, adding an adhesive into the mixture; ball-millingto obtain ceramic slurries, carrying out spray granulation and drying on the obtained ceramic slurry to obtain ZTA composite powder, carrying out compression molding on the ZTA composite powder to obtain a green body, placing the obtained green body in an air atmosphere, carrying out primary sintering to obtain a primary blank, and carrying out hot isostatic pressing sintering on the primary blankto obtain a ZTA ceramic material, wherein the temperature of the hot isostatic pressing sintering is 20-50 DEG C lower than the temperature of the primary sintering. The fine-grain ZTA ceramic obtained by the preparation method has high hardness, toughness, wear resistance and biocompatibility, and can be widely used as a cutting tool, structural ceramic, a human body wear-resistant implant material and the like.

Description

technical field [0001] The invention belongs to the technical field of ceramic material preparation, and in particular relates to a fine-grain pink ZTA ceramic and a preparation method thereof. Background technique [0002] Zirconia toughened alumina (ZTA) ceramics have higher strength and toughness than alumina, and better hardness and wear resistance than zirconia, making it a composite material with high strength, high hardness and good toughness. phase ceramic materials. Pink ZTA is a type of ceramics gradually developed based on ZTA ceramics. In addition to using the phase transition toughening of zirconia, the ceramics also introduce an appropriate amount of strontium oxide, calcium oxide and magnesium oxide to react with alumina to generate SA6 (SrO 6Al 2 o 3 ), CA6 (CaO 6Al 2 o 3 ) or MA6 (MgO 6Al 2 o 3 ); This component forms plate-shaped alumina grains in the microstructure, which can further induce crack deflection and improve the strength and toughness of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/626C04B35/645C04B35/632C04B35/634
CPCC04B35/10C04B35/6261C04B35/6455C04B35/63424C04B35/632C04B2235/9661C04B2235/3244C04B2235/3225C04B2235/3206C04B2235/3208C04B2235/3213C04B2235/3241C04B2235/661C04B2235/5445C04B2235/96
Inventor 熊慧文雷鹏飞陈超胡懿郃周科朝
Owner XIANGYA HOSPITAL CENT SOUTH UNIV
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