Method for preparing sodium niobate powder

A technology of sodium niobate and powder, which is applied in chemical instruments and methods, niobium compounds, sustainable manufacturing/processing, etc., can solve the problems of long powder cycle, save energy, shorten reaction time, and increase heating rate Effect

Inactive Publication Date: 2010-04-21
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The above methods for preparing ceramic powders all require high-

Method used

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  • Method for preparing sodium niobate powder
  • Method for preparing sodium niobate powder
  • Method for preparing sodium niobate powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this example, Nb 2 o 5 Be raw material, NaOH is mineralizer, carry out according to the following steps:

[0041] 1) preheating

[0042] First, turn on the power of the microwave instrument to preheat for 20-40 minutes;

[0043] 2) Weigh raw materials, mix

[0044] Weigh four 1.33g portions of Nb 2 o 5 , to prepare aqueous NaOH solutions with concentrations of 9mol / L, 10mol / L, 12mol / L and 15mol / L, respectively. Four copies of Nb 2 o 5 Mix with NaOH aqueous solutions of different concentrations in a beaker, stir with a glass rod to dissolve completely;

[0045] 4) Heating

[0046] Pour the solution in each beaker into the reaction kettle of the MDS-8 multi-flux airtight microwave instrument, the filling degree reaches 55%; fill the kettle, set the heating curve, the heating temperature is 210°C, and the reaction time is 30min;

[0047] 5) cooling

[0048] After the heating is completed, wait until the kettle is cooled below 100°C, take out the kettle to coo...

Embodiment 2

[0054] In this example, Nb 2 o 5 Be raw material, NaOH is mineralizer, carry out according to the following steps:

[0055] 1) preheating

[0056] First, turn on the power of the microwave instrument to preheat for 40 minutes;

[0057] 2) Weigh raw materials, mix

[0058] Weigh three 1.33g Nb 2 o 5 , prepare three NaOH aqueous solutions with concentrations all of 10mol / L. Will Nb 2 o 5 and NaOH aqueous solution were mixed in a beaker, stirred with a glass rod to dissolve completely;

[0059] 4) Heating

[0060] Pour the mixed solution into the reaction kettle of the MDS-8 multi-flux airtight microwave instrument, and the filling degree reaches 55%; fill the kettle, set the heating curve, and keep the temperature at 180°C, 200°C and 210°C for 30 minutes to prepare the powder body.

[0061] 5) cooling

[0062] After the heating is completed, wait until the kettle is cooled below 100°C, take out the kettle to cool, open it, pour out the supernatant, and pour the remai...

Embodiment 3

[0068] In this example, Nb 2 o 5 And NaOH is raw material, and KOH is mineralizer, carries out according to the following steps:

[0069] 1) preheating

[0070] First turn on the power of the microwave instrument to preheat for 20 minutes;

[0071] 2) Weigh raw materials, mix

[0072] Weigh two 1.33g Nb 2 o 5 , and then weighed 1.54g and 3.08g KOH respectively, and prepared two NaOH aqueous solutions with a concentration of 9mol / L. Will Nb 2 o 5 , KOH and NaOH aqueous solution are mixed (wherein the concentration of KOH is 0.5mol / L and 1.0mol / L respectively), stir with glass rod to make it dissolve completely;

[0073] 4) Heating

[0074] Pour the solution in each beaker into the reaction kettle of the MDS-8 multi-flux airtight microwave instrument, the filling degree reaches 55%; fill the kettle, set the heating curve, the heating temperature is 210°C, and the reaction time is 30min;

[0075] 5) cooling

[0076] After the heating is completed, wait until the kettle...

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Abstract

The invention discloses a method for preparing sodium niobate powder. The method comprises: taking Nb2O5 and NaOH as raw materials and KOH as mineralizer or taking Nb2O5 as raw materials and NaOH as mineralizer; weighing 20 to 40 percent of NaOH ,55 to 75 percent of deionized water ,1 to 3 percent of Nb2O5 and 2 to 4 percent of KOH by weight when Nb2O5 and NaOH are taken as the raw materials and KOH is taken as the mineralizer; weighing 20 to 40 percent of NaOH ,55 to 75 percent of distilled water and 1 to 3 percent of Nb2O5 by weight when Nb2O5 is taken as the raw materials and NaOH is taken as the mineralizer; adding the weighed raw materials to a beaker respectively; stirring with a glass rod to completely dissolve the raw materials; and obtaining the sodium niobate powder through heating, cooling, cleaning and drying processes. The powder prepared by the method for preparing sodium niobate powder is pure orthorhombic sodium niobate powder. Moreover, as the method adopts a microwave internal heating mode, the method has the advantages of heating more uniformly, raising heating rate and greatly shortening reaction time, along with simple process control, strong repeatability, short process cycle and energy conservation.

Description

technical field [0001] The invention belongs to the field of preparation of ceramic materials, and relates to a preparation method of piezoelectric ceramic powder, in particular to a preparation method of sodium niobate powder used in piezoelectric ceramics. Background technique [0002] Piezoelectric ceramics is a high-performance ceramic material, which is widely used in many fields such as microelectronics. However, most of the commonly used piezoelectric ceramics are lead-based ceramics, mainly in the lead zirconate titanate system [Pb(TiZr)O 3 Abbreviated as PZT] and its doping modification on the basis of PZT. The main component of PZT-based ceramics is PbO, a toxic substance that is volatile at the sintering temperature. In addition to causing harm to the human body and the environment, it also reduces the consistency and repeatability of the piezoelectric parameters of the product. Therefore, from the perspective of environmental protection and technological develo...

Claims

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Application Information

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IPC IPC(8): C01G33/00C04B35/495
CPCY02P20/10
Inventor 谈国强秦波博海洋
Owner SHAANXI UNIV OF SCI & TECH
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