Method for preparing high-entropy rare earth tantalate spherical powder by molten salt method
A spherical powder and tantalate technology, which is applied in the field of preparing high-entropy rare earth tantalate spherical powder by molten salt method, can solve the problems of conduction rate loss, low powder purity, limited product formation, etc. Stable, simple process, good sphericity and fluidity
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[0030] The invention provides a method for preparing high-entropy rare earth tantalate spherical powder by molten salt method, the chemical formula of the high-entropy rare earth tantalate spherical powder is: Wherein the A element is selected from at least two of Y, Al, and RE, x represents the number of oxides (x≥2), wherein i is an integer, and 2≤i≤x. Its preparation method specifically comprises the following steps:
[0031] Weigh x kinds of oxides A in proportion 2 o 3 (A=Y, Al, rare earth element RE), tantalum pentoxide Ta 2 o 5 and molten salt raw materials, add ball milling medium and ball milling aids, and perform ball milling. After the ball milling is uniform, the material is dried, sieved, and then heated and calcined. After the calcination, the powder is cooled to room temperature and washed to remove excess chloride salt and impurities. organics until no Cl was detected in the filtrate - So far; the washed powder is filtered, dried, and sieved to obtain high...
Embodiment 1
[0056] Preparation of high entropy rare earth tantalate (Y) by molten salt method 0.2 Nd 0.2 SM 0.2 Er 0.2 Dy 0.2 ) 3 TaO 7 Spherical powder, concrete method comprises the following steps:
[0057] Weigh Y according to the molar ratio of 3 / 5:3 / 5:3 / 5:3 / 5:3 / 5:1 2 o 3 、Nd 2 o 3 、Sm 2 o 3 、Er 2 o3 、Dy 2 o 3 and Ta 2 o 5 A total of 10kg, 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 materials and molten salt according to 1:4 and pour them into the ball mill jar, and use absolute ethanol as the Medium, the ball-to-material ratio is 5:1, ball milled in a planetary ball mill for 12h (500r / min), dried at 90°C for 24h, passed through a 400-mesh sieve, and then placed in a resistance furnace for calcination, calcination temperature and calcination time 800°C and 5h, respectively, with a heating rate of 5°C / min. After the calcination, cool with the furnace. When the temperature drops to room temperature, tak...
Embodiment 2
[0063] Preparation of high-entropy rare earth tantalates (Eu 1 / 3 Lu 1 / 3 Yb 1 / 3 ) 3 TaO 7 The method of spherical powder, concrete method comprises the following steps:
[0064] Weigh Eu according to the molar ratio of 1:1:1:3 2 o 3 、Lu 2 o 3 , Yb 2 o 3 and Ta 2 o 5 A total of 5kg, weigh the mixed salt of KCl and NaCl according to the ratio of 5:1, weigh the raw materials and molten salt according to (1~2):(2~7) and pour them into the ball mill jar, as shown in Table 2, use absolute ethanol as the Medium, the ball-to-material ratio is 5:1, ball milled in a planetary ball mill for 12h (500r / min), dried at 90°C for 24h, passed through a 400-mesh sieve, and then placed in a resistance furnace for calcination, calcination temperature and calcination time 800°C and 5h, respectively, with a heating rate of 5°C / min. After the calcination, cool with the furnace. When the temperature drops to room temperature, take out the powder, and wash the obtained product several times ...
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