Preparation method of nano dysprosium titanate powder

A nano-titanium and powder technology, applied in nanotechnology, chemical instruments and methods, titanium compounds, etc., can solve the problems of easy incorporation of impurities, large particle size of synthetic powder, and achieve uniform particle size, low crystal formation temperature, The effect of high product purity

Inactive Publication Date: 2012-10-03
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Dysprosium titanate powder can be synthesized by solid phase reaction method, but compared with che

Method used

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  • Preparation method of nano dysprosium titanate powder
  • Preparation method of nano dysprosium titanate powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Molar ratio Dy:Ti=1:1

[0027] 1. Add 40ml of butyl titanate to 20ml of absolute ethanol while stirring to obtain a butyl titanate alcohol solution;

[0028] 2. Add 30ml of absolute ethanol to 10ml of deionized water and stir evenly, add hydrochloric acid to adjust the pH to 2; add 4ml of glacial acetic acid to slow down the hydrolysis and polymerization speed of butyl titanate, then add 41g of dysprosium nitrate to the solution, stir to make It is completely dissolved to obtain dysprosium nitrate solution;

[0029] 3. Slowly add the dysprosium nitrate solution in step 2 into the butyl titanate solution in step 1, and stir fully to obtain a mixed sol;

[0030] 4. Aging the mixed sol prepared in step 3 at room temperature for 24 hours to obtain a gel; then drying the gel at 80°C, pulverizing, and passing through a 100-mesh sieve to obtain a dry gel powder of dysprosium titanate precursor;

[0031] 5. Put the dysprosium titanate precursor xerogel into an alum...

Embodiment 2

[0033] Embodiment 2: molar ratio Dy:Ti=1.7:1

[0034] 1. Add 40ml of butyl titanate to 40ml of absolute ethanol while stirring to obtain a butyl titanate solution;

[0035] 2. Add 30ml of absolute ethanol to 20ml of deionized water and stir evenly, add hydrochloric acid to adjust the pH to 1.5; add 2ml of glacial acetic acid to slow down the hydrolysis and polymerization speed of butyl titanate, the molar ratio Dy:Ti is 1.7:1, Add 69.7g of dysprosium nitrate in the solution, stir to make it dissolve completely, and obtain dysprosium nitrate solution;

[0036] 3. Slowly add the dysprosium nitrate solution in step 2 into the butyl titanate solution in step 1, and stir fully to obtain a mixed sol;

[0037] 4. Aging the mixed sol prepared in step 3 at room temperature for 24 hours to obtain a gel; then drying the gel at 50°C, pulverizing, and passing through a 200-mesh sieve to obtain a dry gel powder of dysprosium titanate precursor;

[0038] 5. Put the dysprosium titanate prec...

Embodiment 3

[0040] Embodiment 3: molar ratio Dy:Ti=1.2:1

[0041] 1. Add 40ml of butyl titanate to 20ml of absolute ethanol while stirring to obtain a butyl titanate solution;

[0042] 2. Add 20ml of absolute ethanol to 10ml of deionized water and stir evenly, add hydrochloric acid to adjust the pH to 0.5~1; add 3ml of glacial acetic acid to slow down the hydrolysis and polymerization speed of butyl titanate, and the molar ratio Dy:Ti is 1.2: 1. Add 49g of dysprosium nitrate to the solution, stir to make it completely dissolve, and obtain dysprosium nitrate solution;

[0043] 3. Slowly add the dysprosium nitrate solution in step 2 into the butyl titanate solution in step 1, and stir fully to obtain a mixed sol;

[0044]4. Aging the mixed sol prepared in step 3 at room temperature for 24 hours to obtain a gel; then drying the gel at 70°C, pulverizing, and passing through a 100-mesh sieve to obtain a dysprosium titanate precursor xerogel powder;

[0045] 5. Put the dysprosium titanate pre...

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Abstract

The invention relates to a preparation method of nano dysprosium titanate powder. The method comprises the steps of dropping alcohol/water/glacial acetic acid mixed solution containing dysprosium nitrate into titanium acid butyl ester alcohol solution according to the molar ratio of Dy:Ti=(1-2:1); ageing obtained colloidal sol at the room temperature so as to obtain gel; drying and crushing the gel, arranging the gel into an aluminum oxide crucible, sintering the gel at 8001100 DEG C so as to obtain the nano dysprosium titanate powder. The nano dysprosium titanate powder preparation process is simple, the grain size of the powder is even and small, and the purity is high; and the powder can be used as neutron absorbing materials.

Description

technical field [0001] The invention relates to a preparation method of nano dysprosium titanate powder used as a neutron absorbing material, and belongs to the technical field of neutron absorbing materials. Background technique [0002] The main function of nuclear radiation shielding materials is to absorb or weaken neutrons and gamma rays. In a nuclear reactor, most of the neutrons after passing through the pressure vessel and the sealed chamber have been moderated into thermal neutrons or epithermal neutrons. Such neutrons require materials with large thermal neutron absorption cross-sections for effective absorption without overflow. [0003] The B10 isotope has a large thermal neutron absorption cross section, so boron carbide and boron steel are used in control rods and as shielding materials in the nuclear industry. However, due to the radiation B 10 The resulting (n,α) reaction causes these materials to "expand" after irradiation, forming nuclear bubbles. In th...

Claims

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Application Information

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IPC IPC(8): C01G23/00B82Y40/00
Inventor 谭砂砾张玉军刘小俊龚红宇李其松张琳
Owner SHANDONG UNIV
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