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High-mechanical-strength potassium-sodium niobate based lead-free piezoelectric ceramic material, preparation method of material and application of material

A potassium sodium niobate-based, lead-free piezoelectric technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problems of low bending strength and achieve good electrical properties, The effect of good mechanical properties

Inactive Publication Date: 2017-11-24
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently known fracture toughness K of KNN-based ceramics IC less than 1.3MPam 1 / 2 , flexural strength σ f lower than 143MPa

Method used

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  • High-mechanical-strength potassium-sodium niobate based lead-free piezoelectric ceramic material, preparation method of material and application of material
  • High-mechanical-strength potassium-sodium niobate based lead-free piezoelectric ceramic material, preparation method of material and application of material
  • High-mechanical-strength potassium-sodium niobate based lead-free piezoelectric ceramic material, preparation method of material and application of material

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preparation example Construction

[0060] The present invention provides a method for preparing the potassium sodium niobate-based lead-free piezoelectric ceramic material described in the above technical solution, comprising the following steps:

[0061] (1) According to the type and molar ratio of each metal element in the potassium sodium niobate-based lead-free piezoelectric ceramic material, weigh the corresponding amount of Li 2 CO 3 、K 2 CO 3 、Na 2 CO 3 , Nb 2 o 5 , Sb 2 o 3 、 Ta 2 o 5 , MnO 2 , Fe 2 o 3 、Ni 2 o 3 , CuO, Cr 2 o 3 、Co 2 o 3 , CeO 2 、Nd 2 o 3 and Yb 2 o 3 , as a raw material;

[0062] (2) crushing the raw materials to obtain a mixture;

[0063] (3) Pre-burning the mixture to obtain a pre-fired material;

[0064] (4) crushing the calcined material to obtain a fine powder;

[0065] (5) After mixing the fine powder and the binder, press molding to obtain a molding material;

[0066] (6) Sintering the molding material to obtain a ceramic material;

[0067] (7) Putt...

Embodiment 1

[0088] (1), purchase chemically pure Li from the market 2 CO 3 、K 2 CO 3 、Na 2 CO 3 , Nb 2 o 5 , Sb 2 o 3 、 Ta 2 o 5 , MnO 2 As raw material, according to the chemical formula [Li of potassium niobate base lead-free piezoelectric ceramic material of the present invention 0.06 (K 0.47-x Na 0.47+x )][(Nb 0.893 Sb 0.057 Ta 0.05 ]O 3 +y MnO 2, wherein x=0, y=0.0008 take the raw material; put the weighed raw material into the ball mill jar, add the dehydrated alcohol accounting for 80% of the total weight of the above raw material, and mix it on the planetary ball mill at a speed of 150r / min And grind for 2h;

[0089] (2), put the mixed material after ball milling in the crucible after drying at 80°C, pre-burn at 900°C, and keep it for 3.5h; After water ethanol, grind at a speed of 150r / min for 4h;

[0090] (3), dry the finely ground pre-fired synthetic powder at 80°C, add an appropriate amount of binder, place it in a mold, and press it into the required ceram...

Embodiment 2

[0096] (1), purchase chemically pure Li from the market 2 CO 3 、K 2 CO 3 、Na 2 CO 3 , Nb 2 o 5 , Sb 2 o 3 、 Ta 2 o 5 , MnO 2 As raw material, according to the chemical formula [Li of potassium niobate base lead-free piezoelectric ceramic material of the present invention 0.06 (K 0.47-x Na 0.47+x )][(Nb 0.893 Sb 0.057 Ta 0.05 ]O 3 +y MnO 2 , where x=0.03, y=0.0008 take the raw material; put the weighed raw material in the ball mill jar, add the dehydrated alcohol accounting for 80% of the total weight of the above raw material, and mix it on the planetary ball mill at a speed of 150r / min And grind for 2h;

[0097] (2), put the mixed material after ball milling in the crucible after drying at 80°C, pre-burn at 900°C, and keep it for 3.5h; After water ethanol, grind at a speed of 150r / min for 4h;

[0098] (3), dry the finely ground pre-fired synthetic powder at 80°C, add an appropriate amount of binder, place it in a mold, and press it into the required ceram...

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Abstract

The invention provides a high-mechanical-strength potassium-sodium niobate based lead-free piezoelectric ceramic material, a preparation method of the material and an application of the material. The potassium-sodium niobate based lead-free piezoelectric ceramic material comprises [Li0.06(K0.47-xNa0.47+x)][(Nb0.893Sb0.057Ta0.05)O3, TMO (transition metal oxide) and REO (rare earth oxide), wherein the TMO is MnO2, Fe2O3, Ni2O3, CuO, Cr2O3 or Co2O3, and the REO is Ce2O3, Nd2O3 or Yb2O3. Li<+> co-substitutes A-site K<+> and Na<+>, Sb<5+> and Ta<5+> co-substitutes B-site Nb<5+>, synergistic modification is realized by transition / rare-earth metal oxide coping, the sintering property of the potassium-sodium niobate based ceramics is improved, and controllable preparation of low-porosity dense ceramics is realized, so that the potassium-sodium niobate based lead-free piezoelectric ceramic material has good mechanical strength and piezoelectric performance.

Description

technical field [0001] The invention relates to the technical field of lead-free piezoelectric ceramic materials, in particular to a potassium sodium niobate-based lead-free piezoelectric ceramic material with high mechanical strength and a preparation method and application thereof. Background technique [0002] Piezoelectric ceramics are a class of versatile functional materials that can convert mechanical energy to electrical energy. Piezoelectric ceramics are widely used in the production of ultrasonic transducers, underwater sonar detectors, piezoelectric transformers, filters, piezoelectric buzzers and other devices, and play a pivotal role in national economy, science and technology, and modern national defense. [0003] Traditional ferroelectric piezoelectric ceramic materials are mainly based on Pb(Zr,Ti)O 3 (PZT)-based binary and ternary ceramics have excellent electrical properties. When piezoelectric ceramic materials are used to make high-performance piezoelec...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622H01L41/187
CPCC04B35/495C04B35/622C04B2235/6562C04B2235/656C04B2235/6567C04B2235/602C04B2235/77C04B2235/96C04B2235/3203C04B2235/3201C04B2235/3294C04B2235/3251C04B2235/3267H10N30/8542
Inventor 何云斌郭金明周桃生尚勋忠卢寅梅张清风
Owner HUBEI UNIV
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