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Preparation method of potassium-sodium niobate ceramic material with high remnant polarization strength

A technology of polarization strength and potassium sodium niobate, which is applied in the field of preparation of K0.5Na0.5NbO3 ceramic remanent polarization strength, can solve the problem of low remanent polarization strength of ceramics, and achieve the effect of simple preparation method

Inactive Publication Date: 2020-08-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention is to solve the existing lead-free K 0.5 Na 0.5 NbO 3 The technical problem of ceramic remanent polarization is low, and a kind of preparation method of potassium sodium niobate ceramic material with high remanent polarization is provided

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  • Preparation method of potassium-sodium niobate ceramic material with high remnant polarization strength
  • Preparation method of potassium-sodium niobate ceramic material with high remnant polarization strength
  • Preparation method of potassium-sodium niobate ceramic material with high remnant polarization strength

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specific Embodiment approach 1

[0019] Specific embodiment one: the preparation method of the potassium sodium niobate ceramic material with high remnant polarization of the present embodiment, carries out according to the following steps:

[0020] Two, potassium carbonate (K 2 CO 3 ) and sodium carbonate (Na 2 CO 3 ) powders are respectively placed in an oven and heated to remove moisture;

[0021] 2. Potassium carbonate (K 2 CO 3 ) and sodium carbonate (Na 2 CO 3 ) powder and niobium pentoxide (Nb 2 o 5 ) powder according to K 0.5 Na 0.5 NbO 3 The stoichiometric ratio is weighed and mixed uniformly to obtain a mixed powder;

[0022] 3. Add alcohol to the mixed powder obtained in step 2, and ball mill in a ball mill at a speed of 200-500 rpm for 8-24 hours to obtain a suspension A;

[0023] 4. Dry the suspension A obtained in step 3 to obtain powder A, and then put the powder A into a tube furnace and keep it at a temperature of 800-1000°C for 3-6 hours to obtain pre-calcined powder;

[0024]...

specific Embodiment approach 2

[0027] Embodiment 2: This embodiment differs from Embodiment 1 in that the heating temperature in step 1 is 150-250° C., and the heating time is 0.5-2 h; other aspects are the same as Embodiment 1.

specific Embodiment approach 3

[0028] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the drying temperature of suspension A in step 4 is 60-120° C.; the others are the same as Embodiment 1 or 2.

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Abstract

The invention discloses a preparation method of a potassium-sodium niobate ceramic material with high remnant polarization strength, and relates to a preparation method for improving the remnant polarization strength of K0.5Na0.5NbO3 ceramic. The invention aims to solve the technical problem that the existing lead-free K0.5Na0.5NbO3 ceramic is low in remnant polarization intensity. The method comprises the following steps: mixing dried potassium carbonate and sodium carbonate powder with niobium pentoxide powder and then carrying out wet ball milling; drying, putting the dried raw materials into a tubular furnace for presintering, then carrying out wet ball milling, putting the dried raw materials into a hot-pressing furnace in an oxygen atmosphere for high-temperature and high-pressure sintering, and putting ceramic slices obtained by hot-pressing sintering into the tubular furnace for oxygen annealing so as to obtain the K0.5Na0.5NbO3 ceramic with high remnant polarization strength.The remnant polarization intensity of the ceramic is 24-27 [mu] C / cm < 2 >, which is 1.6-2.7 times that of K0.5Na0.5NbO3 ceramic prepared by a traditional solid-phase method, and the ceramic can be used in the fields of electricity and electronics.

Description

technical field [0001] The present invention involves increasing the K 0.5 Na 0.5 NbO 3 Preparation method of ceramic remanent polarization. Background technique [0002] In the field of piezoelectric ferroelectric materials, lead-based piezoelectric ferroelectric materials have always occupied a dominant position in application devices due to their good temperature stability and excellent performance. However, with the increasing severity of global environmental problems, energy crisis and greenhouse effect, the demand for lead-free piezoelectric ferroelectric materials is gradually increasing. Potassium sodium niobate (K x Na 1-x NbO 3 ) materials have been extensively studied. Potassium sodium niobate (K 0.5 Na 0.5 NbO 3 ) is the focus of research due to its excellent ferroelectricity and high Curie temperature (420 °C), but the current reported K 0.5 Na 0.5 NbO 3 The remanent polarization strength of crystals and ceramic materials prepared by traditional sol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/645
CPCC04B35/495C04B35/622C04B35/645C04B2235/3201C04B2235/656C04B2235/6567C04B2235/6585C04B2235/663
Inventor 李均白晗洪杨周忠祥
Owner HARBIN INST OF TECH
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