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Method for preparing nanometer flaky yttrium oxide powder

A nano-flaky, yttrium oxide technology, applied in chemical instruments and methods, nanotechnology, inorganic chemistry, etc., can solve the problem that the microscopic morphology of nano-yttrium oxide powder has not been effectively controlled, and there is no commercial nano-flaky yttrium oxide. Powder sales and other issues, to achieve the effect of strong repeatability and operability, low preparation cost, and low reaction pressure

Inactive Publication Date: 2012-07-04
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese patents CN1410353, CN1394811, CN1195647, and CN1375457 all provide a method for manufacturing nano-yttrium oxide powders, and prepare nano-scale yttrium oxide powders, but the microscopic morphology of nano-yttrium oxide powders has not been effectively controlled.
[0006] At present, the commercial nanometer yttrium oxide powder in the market is mostly amorphous and approximately spherical in microscopic shape, and there is no commercial nanosheet yttrium oxide powder for sale.

Method used

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  • Method for preparing nanometer flaky yttrium oxide powder
  • Method for preparing nanometer flaky yttrium oxide powder
  • Method for preparing nanometer flaky yttrium oxide powder

Examples

Experimental program
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Embodiment 1

[0025] Prepare a yttrium nitrate solution with a concentration of 0.20 mol / L, add dropwise an ammonia solution with a content of 25%, and adjust the pH value of the yttrium salt solution to 7. After the white colloidal substance was formed, the suspension was transferred to a hydrothermal reactor, subjected to hydrothermal treatment at 140°C for 24 hours, cooled to room temperature, and centrifuged to separate the precursor. The obtained precursor was washed 4 times with deionized water and 3 times with absolute ethanol, so as to fully remove residual acid ion impurities. After drying, it was calcined at 600°C for 4 hours to obtain nano-flaky yttrium oxide powder. It can be seen from the XRD diffraction pattern analysis that the powder sample is pure Y 2 o 3 phase, no other impurity phases such as figure 1 (a) shown. Putting the powder sample under a scanning electron microscope, it can be seen that the microscopic morphology of the powder sample is flake-like, the particl...

Embodiment 2

[0027] Prepare yttrium nitrate solution with a concentration of 0.20mol / L, add dropwise an ammonia solution with a content of 25%, adjust the pH to 9, and generate a white jelly, then transfer the suspension to a hydrothermal reaction kettle, and heat After heat treatment in water for 24 h, the precursor was separated by centrifugation after cooling to room temperature. The precursor was washed 4 times with deionized water and 3 times with absolute ethanol to fully remove residual acid radical impurities. After drying, it was calcined at 600°C for 4 hours to obtain nano-flaky yttrium oxide powder. It can be seen from the XRD diffraction pattern analysis that the powder sample is pure Y 2 o 3 phase, and no other impurity phases such as figure 1 (b). Putting the powder sample under the scanning electron microscope, it can be seen that the microscopic morphology of the powder sample is flake, the particle size is 100-200nm, the slice thickness is 10nm, the ratio of grain diam...

Embodiment 3

[0029] The yttrium nitrate solution in Example 1 was replaced with yttrium sulfate solution, and the implementation process was the same to obtain flaky yttrium oxide powder. The obtained flaky yttrium oxide powder has a particle diameter of 200-300nm, a sheet thickness of 10-20nm, and a grain diameter-to-thickness ratio of about 15-20.

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Abstract

The invention relates to a method for preparing nanometer flaky yttrium oxide powder. The method is characterized by comprising the following steps of: preparing a yttrium-containing inorganic acid salt solution, regulating the solubility of yttrium-containing inorganic acid salt to be 0.1 to 0.5 mol / L, regulating the PH value by using alkaline liquor until the solution is white colloidal suspension, transferring the suspension to a hydro-thermal reaction kettle, and performing hydro-thermal treatment at the temperature of between 80 and 200 DEG C for 24 to 48 hours; after cooling to room temperature, performing centrifugal separation to obtain a precursor; washing the precursor for 4 to 6 times by using deionized water, and washing for 3 to 5 times by using alcohol to remove residual acid radical ion impurities fully; and drying at the room temperature, and calcining at the temperature of between 600 and 800 DEG C for 3 to 6 hours to obtain the nanometer flaky yttrium oxide powder. The flaky yttrium oxide powder prepared by the method is high in dispersity, the grain diameter ranges from 100 to 300 nanometers, the flaky thickness ranges from 10 to 20 nanometers, and a ratio of the diameters of crystal grains to the flaky thickness is (10-30):1. The prepared nanometer flaky yttrium oxide powder can be used as a template material for texturing ceramics and a ceramic additive, and also can be used for preparing high-temperature resistant and corrosion resistant structural materials. The method is simple, and low in cost, and reaction temperature and reaction pressure is low; and granules are flaky, have the nanometer-scale grain diameters and a good dispersing effect and are distributed uniformly and high in purity, so the method is suitable for industrial production.

Description

technical field [0001] The invention provides a method for preparing nano-flaky yttrium oxide powder, which belongs to the technical field of nano-powder preparation and application. Background technique [0002] In the application field of high-tech ceramics, nano-powder plays an important role in improving the performance of materials. The microscopic appearance and performance of powder determine its physical and chemical properties and application fields. As a ceramic powder additive, nano flake powder can effectively improve the microstructure of ceramics. The addition of flake powder can effectively change the fracture form of ceramics. On the one hand, it changes from intergranular fracture to transgranular fracture, and the required fracture energy is higher. On the other hand, it can induce the deflection of the fracture direction, making it more difficult for cracks to propagate Greatly improve the strength and fracture toughness of ceramics. [0003] Nano yttriu...

Claims

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Application Information

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IPC IPC(8): C01F17/00B82Y40/00
Inventor 曹永革费斌杰郭旺黄秋凤李军廷黄志唐飞
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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