Method for low-temperature preparing K0.5Na0.5NbO3 super fines

A technology of ultra-fine powder and low temperature, applied in the field of material science, can solve the problems of serious powder agglomeration, failure to obtain pure phase, and affect powder performance, etc., and achieve the effect of narrow particle size distribution, convenient industrial production, and convenient operation

Inactive Publication Date: 2008-12-31
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

The synthesis temperature of this method is relatively high and the process is relatively complicated. The particle size of the powder is closely related to the heat treatment process, and the pure phase K cannot be obtained at low temperature. 0.5 Na 0.5 NbO 3 Powder, high temperature powder agglomeration is more serious, affecting powder performance

Method used

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  • Method for low-temperature preparing K0.5Na0.5NbO3 super fines
  • Method for low-temperature preparing K0.5Na0.5NbO3 super fines
  • Method for low-temperature preparing K0.5Na0.5NbO3 super fines

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: at first, according to chemical formula K 0.5 Na 0.5 NbO 3 reactant Nb 2 o 5 、Na 2 CO 3 and K 2 CO 3 The powders are mixed, and then urea, a combustion agent with 100% mass of the mixed powder, is added to the mixed powder; secondly, the mixture is put into a container, and calcined at 550°C for more than 6 hours; finally, the calcined product is ground to obtain K 0.5 Na 0.5 NbO 3 Ultrafine powder. Depend on figure 1 It can be seen that the crystal structure of the obtained powder is K 0.5 Na 0.5 NbO 3 .

Embodiment 2

[0012] Embodiment 2: at first, according to chemical formula K 0.5 Na 0.5 NbO 3 reactant Nb 2 o 5 、Na 2 CO 3 and K 2 CO 3 The powders are mixed, and then urea, a combustion agent with 100% mass of the mixed powder, is added to the mixed powder; secondly, the mixture is put into a container, and calcined at 600°C for more than 6 hours; finally, the calcined product is finely ground to obtain K 0.5 Na 0.5 NbO 3 Ultrafine powder. Depend on figure 2 It can be seen that the particle size of the synthetic powder is small and the distribution is small, between 1 and 3 μm. The grain development is better and the agglomeration is lighter.

Embodiment 3

[0013] Embodiment 3: at first, according to chemical formula K 0.5 Na 0.5 NbO 3 reactant Nb 2 o 5 、Na 2 CO 3 and K 2 CO 3 Mix the powders, and then add urea, a combustion agent with a mass of 120% of the mixed powders, into the mixed powders; secondly, put the mixture in a container, and calcinate it at 550°C for more than 6 hours; finally, grind the calcined product finely to obtain K 0.5 Na 0.5 NbO 3 Ultrafine powder. Depend on image 3 It can be seen that the particle size of the synthetic powder is small and the distribution is small, between 1 and 3 μm. The grain development is better and the agglomeration is lighter.

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Abstract

The invention relates to a method for preparing K0.5Na0.5NbO3 superfine powder at low temperature; firstly, the powder of reactants: NB2o5, Na2CO3 and K2CO3, is mixed, and then the mixed powder is added with urea, an incendiary agent, which accounts for 80%-200% weight of the mixed powder; secondly, the mixture is put in a vessel and calcined at 550 DEG C-750 DEG C for more than 6 hours; finally, the calcined product is porphyrized to obtain the K0.5Na0.5NbO3 superfine powder. The K0.5Na0.5NbO3 powder prepared by the invention has high degree of crystallinity, fine particle size, narrow grain size distribution, little agglomeration, good uniformity, and the like; meanwhile, the adoption of urea can lower synthetic temperature; furthermore, the method of the invention has simple technical process and equipment, convenient operation, inexpensive and easily available raw materials and low preparing cost of the powder and is suitable for industrial production; therefore, the method has strong practicability.

Description

technical field [0001] The invention belongs to the field of material science and relates to a low-temperature preparation of K 0.5 Na 0.5 NbO 3 The method of ultrafine powder. Background technique [0002] Piezoelectric ceramics have been widely used in the production of electronic components such as sensors, brakes, buzzers and transducers. However, the widely used piezoelectric ceramics are mainly the traditional lead zirconate titanate Pb(Zr,Ti)O 3 (referred to as PZT) series piezoelectric ceramics. Since the mass percentage of lead in PZT ceramics is more than 60%, the ceramics are extremely harmful during production and use. Some countries have banned the use of electronic materials containing lead. Therefore, it is very urgent to develop lead-free piezoelectric ceramics with environmental harmony. (K 0.5 Na 0.5 )NbO 3 (KNN for short) is recognized as a promising lead-free piezoelectric ceramic due to its low theoretical density, high Curie temperature and ve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G33/00C04B35/495
Inventor 杨海波林营王芬朱建锋
Owner SHAANXI UNIV OF SCI & TECH
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