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Yttrium zirconium composite nano-ceramic powder

A technology of nano-ceramic powder and yttrium oxide, which is applied in the field of ceramic materials, can solve problems such as agglomeration, environmental pollution, and large particle size, and achieve the effects of low cost, good toughness, and good fluidity

Inactive Publication Date: 2009-10-07
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Chinese patent CN1389405 (publication date: 2003.01.08) describes the preparation of zirconia ceramic powder by calcining. This method is easy to cause agglomeration, the particle size is too large, and a large amount of hydrogen chloride gas is discharged, which has great pollution to the environment.

Method used

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  • Yttrium zirconium composite nano-ceramic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] ZrOCl with a total weight of 35g 2 ·8H 2 O and Y 2 o 3 The molar ratio is 95:5, dissolved in 100ml of ethanol, 200ml of 5% sodium bicarbonate solution is added, 0.175g of dispersant A15 (acrylic acid ester) is added, and then washed with ultrasonic cleaning equipment for 25 minutes, and then sent to high pressure In the reaction kettle, hydrothermal reaction was carried out at 8MPa and 220°C for 8 hours; the sediment was sent to the high-speed centrifuge washing equipment through the pipeline, and washed at 16000 rpm for 10 minutes, repeated 3 times, to remove sodium chloride ions and residual impurities, that is, pure tetragonal phase yttrium-zirconium composite nano-ceramic powder with high crystallinity can be obtained.

[0028] The particle size of the nano-ceramic powder obtained in this embodiment is between 20 and 30 nm, such as figure 1 shown.

Embodiment 2

[0030] ZrOCl with a total weight of 70g 2 ·8H 2 O and Y 2 o 3 Dissolve in 200ml of ethanol at a molar ratio of 94:6, add 400ml of sodium bicarbonate with a concentration of 6% by mass and mix evenly, then add 0.35g of dispersant A15 (acrylic acid ester), then wash with ultrasonic cleaning equipment for 25 minutes, send Put it into a high-pressure reactor, and conduct a hydrothermal reaction under the conditions of 9Mpa and 230°C for 9 hours; send the sediment to a high-speed centrifuge washing device through a pipeline for repeated filtration 3 times, remove sodium chloride ions and residual impurities, and obtain crystallinity Highly pure tetragonal yttrium-zirconium composite nano-ceramic powder.

[0031] The particle size of the nano-ceramic powder obtained in this embodiment is between 20nm and 30nm.

Embodiment 3

[0033] ZrOCl with a total weight of 350g 2 ·8H 2 O and Y 2 o 3 Dissolve in 1000ml of deionized water at a molar ratio of 92:8, add 2000ml of potassium bicarbonate with a concentration of 7% by mass and mix evenly, then add 1.75g ​​of dispersant A15 (acrylic acid ester), and then wash with ultrasonic cleaning equipment for 25 minutes. Send it into a high-pressure reactor, and conduct a hydrothermal reaction under the conditions of 10Mpa and 240°C for 10 hours; send the sediment to a high-speed centrifuge washing equipment through a pipeline for repeated filtration for 3 times, remove potassium chloride ions and residual impurities, and obtain crystallization Pure tetragonal yttrium-zirconium composite nano-ceramic powder with high density.

[0034] The particle size of the nano-ceramic powder obtained in this embodiment is between 20nm and 30nm.

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Abstract

The invention relates to an yttrium zirconium composite nano-ceramic powder in the field of ultrafine ceramic and preparation method thereof. The components and molar percentage contents of the composite nano-ceramic powder are as follows: 5% to 8% of yttrium oxide and 92% to 95% of zirconium oxide; the preparation method includes the following steps: zirconium oxychloride is dissolved in ethanol, and then yttrium oxide is added at the temperature of 60 DEG C to 80 DEG C; cooling, sodium bicarbonate or potassium bicarbonate solution is added, acrylic ester is then added, ultrasonic washing is carried out for 20 to 30 minutes, and reaction is carried out after putting in a high pressure reaction pot; the power is taken out after the reaction is finished, and then washed, so that the yttrium zirconium composite nano-ceramic powder is obtained. The invention has simple preparation method and low cost, and industrialization production is easily realized; the yttrium zirconium composite nano-ceramic powder in the invention has the characteristics of good toughness and easy sintering; and the yttrium zirconium composite nano-ceramic powder in the invention rarely has crystal imperfection.

Description

technical field [0001] The invention relates to a ceramic powder in the technical field of ceramic materials and a preparation method thereof, in particular to a yttrium-zirconium composite nano-ceramic powder and a preparation method thereof. Background technique [0002] Zirconia has excellent physical and chemical properties, and is an important structural and functional ceramic material. Ordinary zirconia exists in monoclinic phase at room temperature to 1170°C, transforms into tetragonal phase when heated to 1170°C-2370°C, and transforms from tetragonal phase to cubic phase when heated above 2370°C. As the high-temperature phase of pure zirconia will transform into a low-temperature phase as the temperature decreases, accompanied by a volume expansion of 5% to 7%. The crystal transformation and volume change of pure zirconia, if used as structural ceramics and functional ceramic coating materials, will cause excessive thermal stress when subjected to thermal cycles, wh...

Claims

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Application Information

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IPC IPC(8): C04B35/626C04B35/48
Inventor 王俊陶景超刘婕妤陈海䶮
Owner SHANGHAI JIAO TONG UNIV
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