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Rare earth tantalate RE3TaO7 spherical powder prepared on basis of molten salt method and preparation method of rare earth tantalate RE3TaO7 spherical powder

A spherical powder and tantalate technology, which is applied in the field of rare earth tantalate RE3TaO7 spherical powder and its preparation, can solve the problems of centrifugal spray granulation loss, low powder purity, high synthesis temperature, etc., and achieve good fluidity , strong controllability and low synthesis temperature

Active Publication Date: 2021-11-30
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent CN109437927A discloses a rare earth tantalum / niobate (RE 3 Ta / NbO 7 ) Ceramic powder and its preparation method, but there are problems such as low powder purity, high synthesis temperature, and loss in the centrifugal spray granulation process during the calcination process
[0004] Therefore, for the rare earth tantalate RE prepared by the current prior art 3 TaO 7 The powder has technical defects such as low purity and high synthesis temperature. The present invention develops a rare earth tantalate RE based on the molten salt method. 3 TaO 7 Spherical powder and preparation method, low synthesis temperature, high sphericity, good fluidity, excellent thermal and mechanical properties

Method used

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  • Rare earth tantalate RE3TaO7 spherical powder prepared on basis of molten salt method and preparation method of rare earth tantalate RE3TaO7 spherical powder
  • Rare earth tantalate RE3TaO7 spherical powder prepared on basis of molten salt method and preparation method of rare earth tantalate RE3TaO7 spherical powder
  • Rare earth tantalate RE3TaO7 spherical powder prepared on basis of molten salt method and preparation method of rare earth tantalate RE3TaO7 spherical powder

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preparation example Construction

[0022] The present invention also provides a rare earth tantalate RE based on molten salt method 3 TaO 7 The preparation method of spherical powder, described method specifically comprises the following steps:

[0023] (1) The rare earth oxide RE 2 o 3 and tantalum pentoxide Ta 2 o 5 The raw materials are mixed with molten salt and deionized water in a ball mill tank, then zirconia balls are added and ball milled by a planetary ball mill until they are evenly mixed; the mixed powder is subjected to pressure filtration, drying and sieving in sequence before further processing calcined;

[0024] (2) Take out the powder after cooling to room temperature with the furnace, and wash the obtained product repeatedly with heated deionized water to remove excess chloride salt until the filtrate does not contain Cl - until;

[0025] (3) After the washed powder is filtered, dried and sieved, the rare earth tantalate RE with the required particle size can be obtained 3 TaO 7 Spher...

Embodiment 1

[0049] A kind of molten salt method described in this embodiment prepares rare earth tantalate Y 3 TaO 7 The method for spherical powder specifically comprises the following steps:

[0050] Weigh the raw material rare earth oxide Y at a molar ratio of 3:1 2 o 3 (6.774kg) and tantalum pentoxide Ta 2 o 5 (4.419kg) 11.193kg in total, weigh the mixed salt of KCl and NaCl according to the ratio of (1~6):(1~3), as shown in Table 1, weigh the raw material (11.193kg) and molten salt (55.965kg) according to 1:5 kg) into a ball milling tank, using deionized water as the medium, milling in a planetary ball mill for 12 hours (500r / min). Pass through a 400-mesh sieve for 24 hours, and then place it in a resistance furnace for calcination. The calcination temperature and calcination time are 800°C and 5h, respectively, and the heating rate is 5°C / min. , the resulting product was repeatedly washed several times with heated deionized water to remove excess chloride salts until the 3 ) ...

Embodiment 2

[0055] A kind of molten salt method described in this embodiment prepares rare earth tantalate Dy 3 TaO 7 The method for spherical powder specifically comprises the following steps:

[0056] Weigh the raw material rare earth oxide Dy at a molar ratio of 3:1 2 o 3 (11.19kg) and tantalum pentoxide Ta 2 o 5 (4.419kg) 15.609kg in total, weigh the mixed molten salt of KCl and NaCl according to the ratio of 6:1, weigh the raw materials and molten salt according to (1~2):(2~7) and pour them into the ball mill tank, as shown in Table 2 , using deionized water as the medium, ball milling in a planetary ball mill for 12 hours (500r / min), after the ball milling is completed, use a filter press to remove the water in the slurry, dry it at 90°C for 24 hours, and first pass through a 100-mesh sieve After that (take the sieve) and pass through a 400-mesh sieve (take the sieve), and then place it in a resistance furnace for calcination, the calcination temperature and calcination time ar...

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Abstract

The invention belongs to the technical field of ceramic powder preparation, and particularly relates to rare earth tantalate RE3TaO7 spherical powder prepared on the basis of a molten salt method and a preparation method of the rare earth tantalate RE3TaO7 spherical powder. According to the rare earth tantalate RE3TaO7 spherical powder prepared on the basis of the molten salt method and the corresponding preparation method, rare earth oxide RE2O3 and tantalum pentoxide Ta2O5 serve as two raw materials, and the rare earth tantalate RE3TaO7 spherical powder synthesized through the molten salt method is high in purity and low in synthesis temperature. According to the method disclosed by the invention, the morphology and the particle size of the powder can be controlled by controlling the proportion of the molten salt to the raw materials, the components of the molten salt, the calcination temperature and the calcination time, and the rare earth tantalate RE3TaO7 spherical powder with high sphericity rate and good fluidity is obtained. In addition, the prepared rare earth tantalate RE3TaO7 spherical powder has the advantages of being uniform in particle size, excellent in performance, stable in quality, high in controllability, suitable for industrial production and the like.

Description

technical field [0001] The invention belongs to the technical field of ceramic powder preparation, in particular to a rare earth tantalate RE prepared based on molten salt method 3 TaO 7 Spherical powder and its preparation method. Background technique [0002] RE 3 TaO 7 with RE 2 Zr 2 o 7 have similar crystal structures, in most cases RE 3 TaO 7 (RE=La-Dy, Y) is an orthorhombic phase (ordered), that is, a ice magnesium crystal structure, while the rest of the RE with a smaller radius of rare earth ions 3 TaO 7 (RE=Ho-Lu) ceramics, is a cubic phase fluorite structure (disordered), in RE 3 TaO 7 2 / 3 of the cation vacancies and 1 / 3 of the rare earth atoms constitute a rare earth atom site, the concentration of cation defects at the rare earth atom site is 2 / 3, and one Ta atom coordinates with six O atoms to form a TaO 6 octahedron, the structure thus constituted with the orthorhombic phase of the RE 3 TaO 7 Approximate crystal structure. [0003] Chinese patent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/495C04B35/626
CPCC04B35/50C04B35/495C04B35/62605C04B2235/3225C04B2235/3227C04B2235/9607
Inventor 冯晶汪俊种晓宇苏涛屈晨凯王建坤张陆洋
Owner KUNMING UNIV OF SCI & TECH
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