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AMmonium hydroxide p4recipitation method fr preparing nano powder of Y 203 and transparent ceramics

A technology of ammonium hydroxide and nanopowder, which is applied in the field of ammonium hydroxide precipitation method for preparing Y2O3 nanopowder, and can solve problems such as preparation difficulties

Inactive Publication Date: 2006-12-20
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Existing preparation Y 2 o 3 Most methods of transparent ceramics require higher sintering temperature or doping ThO 2 or BeO and other toxic or radioactive additives, which bring many difficulties to the preparation

Method used

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  • AMmonium hydroxide p4recipitation method fr preparing nano powder of Y 203 and transparent ceramics

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Embodiment Construction

[0017] Y 2 o 3 Coarse powder (5N) and analytically pure concentrated HNO 3 As raw material, Y(NO 3 ) 3 Solution 500ml. Prepare NH at a concentration of 1M 4 OH as a precipitant. Will NH 4 OH was titrated to vigorously stirred Y(NO 3 ) 3 in solution. During the reaction, the system was placed in an ice-water mixture water bath, the temperature of the reaction system was controlled to be 0° C., the titration rate was 5 ml / min, and the final pH value of the system was 8.0. After the titration was completed, the stirring was continued for 0.5 h while maintaining the temperature of the reaction system. After aging, the precursor precipitate was washed 4 times with distilled water to remove the reaction by-product NH 4 NO 3 , and then washed twice with absolute ethanol to remove the moisture in the precursor precipitate. After the precursor precipitate was washed, it was dried in an oven at 60 °C for 24 h. The dried precursor precipitate was crushed with an alumina mor...

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Abstract

In the invention, Y(NO3) solution with density 0.1-0.4 mol / L composed by 5N Y2O3 crude powder and analyse pure hydrogen nitrade and NH4OH with density 0.3-2M are used as raw material to do titration, at same time, (NH4)2SO4 (weight is 1-10 percent of reaction material total weight) is added in cold water showering in temp. 0-4 deg.C to do positive titrating, NH4OH precipitating agent with density 0.3-2 M is titrated into Y(NO3) solution with density 0.1-0.4 mol / L, the titrating speed is 2-15 mol / min, final pH value is 7.6-8.3, then continuous stirring in temp 0-4 deg.C, washing by using water and alcohol, drying 24 hours in temp. 60 deg.C. Ground dry precipitant is burned 2-10 hours in temp. 900-1100 deg.c to produce Y2O3 nanometre powder with particle size about 20-60 nm. Said nanometre is composed of green bodies by 150-230 Mpa isostatic pressure and is fired in temp. 1600-1800 deg.C in vacuum to produce Y2O3 transparent ceramics.

Description

technical field [0001] According to the International Patent Classification Table, the present invention belongs to the technical field of preparation of fine ceramics containing rare earth oxide transparent products, and particularly relates to the preparation of Y 2 o 3 Ammonium hydroxide precipitation method for nanopowder and transparent ceramics. Background technique [0002] Yttrium oxide (Y 2 o 3 ) is an excellent high-temperature infrared material and electronic material, with a melting point greater than 2400°C, a dielectric constant of 12-14, and good transparency. due to Y 2 o 3 The unique structure type, higher melting point and corrosion resistance enable it to work under harsher conditions than alumina transparent ceramics. It is more important to contain Nd 2 o 3 the Y 2 o 3 base transparent ceramic material. This ceramic can be used in laser technology for solid-state lasers with a wavelength of 1.06 μm. Y known as Yttralox 2 o 3 Transparent cer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622C04B35/624C04B35/64C04B35/50
Inventor 孙旭东闻雷修稚萌霍地左良
Owner NORTHEASTERN UNIV LIAONING