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Low-temperature co-firing method for potassium-sodium niobate leadless piezoelectric ceramic and silver electrode

A potassium sodium niobate, lead-free piezoelectric technology, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve the problem of shrinking KNN-based ceramics. Application range, difficulty in realization, etc., to shorten the preparation cycle, simplify the process flow, and improve the sintering performance.

Inactive Publication Date: 2021-08-24
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few studies on the co-firing of KNN-based ceramics and silver-palladium alloy electrodes, mainly because it is difficult to realize the co-firing of KNN-based ceramics and silver electrodes, which greatly reduces the application range of KNN-based ceramics.

Method used

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  • Low-temperature co-firing method for potassium-sodium niobate leadless piezoelectric ceramic and silver electrode
  • Low-temperature co-firing method for potassium-sodium niobate leadless piezoelectric ceramic and silver electrode
  • Low-temperature co-firing method for potassium-sodium niobate leadless piezoelectric ceramic and silver electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Ingredients: K 2 CO 3 、Na 2 CO 3 and Nb 2 o 5 Mix according to molar ratio 1:1:2 to obtain compound;

[0035] (2) Ball milling: put the mixture into the ball milling tank, then add the ball milling medium into the ball milling tank, and fully mill it for 12 hours. After the ball milling, transfer the mixed slurry to a crystallization dish and place it in an oven at 80°C Dry in the oven, and then put the mixture into the mortar for grinding;

[0036] (3) Pre-burning: Add the above-mentioned ground mixture into the crucible, compact and cover it, put it in the muffle furnace, heat it up to 850°C for 4 hours, and take it out after it is naturally cooled to room temperature;

[0037] (4) Secondary ball milling: Add the above-mentioned pre-calcined mixture into the ball milling tank, and add the ball milling medium into the ball milling tank, and fully mill it for 12 hours. After the ball milling, transfer the slurry to the crystallization dish and place Dry in an...

Embodiment 2

[0042] (1) Ingredients: K 2 CO 3 、Na 2 CO 3 and Nb 2 o 5 Mix according to molar ratio 1:1:2 to obtain compound;

[0043] (2) Ball milling: put the mixture into the ball milling tank, then add the ball milling medium into the ball milling tank, and fully mill it for 12 hours. After the ball milling, transfer the mixed slurry to a crystallization dish and place it in an oven at 80°C Dry in the oven, and then put the mixture into the mortar for grinding;

[0044] (3) Pre-burning: Add the above-mentioned ground mixture into the crucible, compact and cover it, put it in the muffle furnace, heat it up to 850°C for 4 hours, and take it out after it is naturally cooled to room temperature;

[0045] (4) Secondary ball milling: Add the above-mentioned pre-calcined mixture into the ball milling tank, and add the ball milling medium into the ball milling tank, and fully mill it for 12 hours. After the ball milling, transfer the slurry to the crystallization dish and place Dry in an...

Embodiment 3

[0050] (1) Ingredients: K 2 CO 3 、Na 2 CO 3 and Nb 2 o 5 Mix according to molar ratio 1:1:2 to obtain compound;

[0051] (2) Ball milling: put the mixture into the ball milling tank, then add the ball milling medium into the ball milling tank, and fully mill it for 12 hours. After the ball milling, transfer the mixed slurry to a crystallization dish and place it in an oven at 80°C Dry in the oven, and then put the mixture into the mortar for grinding;

[0052] (3) Pre-burning: Add the above-mentioned ground mixture into the crucible, compact and cover it, put it in the muffle furnace, heat it up to 850°C for 4 hours, and take it out after it is naturally cooled to room temperature;

[0053] (4) Secondary ball milling: Add the above-mentioned pre-calcined mixture into the ball milling tank, and add the ball milling medium into the ball milling tank, and fully mill it for 12 hours. After the ball milling, transfer the slurry to the crystallization dish and place Dry in an...

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Abstract

The invention discloses a low-temperature co-firing method for potassium-sodium niobate leadless piezoelectric ceramic and a silver electrode. The low-temperature co-firing method comprises the following steps: preparing potassium-sodium niobate powder, adding a mixed solution of KOH and NaOH, conducting grinding, performing sintering at 350 DEG C under uniaxial pressure for 4 hours to obtain KNN ceramic with a relative density of 94.0%, and co-firing the KNN ceramic and the silver electrode at 800 DEG C to further densifying the ceramic, wherein the relative density of the KNN ceramic after silver firing treatment is 96.0%, the relative dielectric constant of the KNN ceramic is 829, and the piezoelectric constant d33 of the KNN ceramic is 148 pC / N, which is far higher than the piezoelectric constant (80 pC / N) of pure KNN ceramic prepared by using a traditional method. The method of the invention is simple in process step and easy to operate, the sintering temperature of the KNN ceramic can be greatly reduced, the problem of volatilization of potassium and sodium ions in the high-temperature sintering process of the KNN ceramic is solved, the deviation of a stoichiometric ratio is reduced, the electrical properties of the KNN ceramic are improved, and meanwhile, a new thought is provided for low-temperature preparation of a multi-layer ceramic capacitor (MLCC).

Description

technical field [0001] The invention belongs to the field of functional ceramic materials, and in particular relates to a low-temperature co-firing method of potassium sodium niobate lead-free piezoelectric ceramics and silver electrodes. Background technique [0002] Piezoelectric ceramics have the function of converting mechanical energy and electrical energy. In addition to being widely used in daily life and industrial production, piezoelectric ceramics are also closely watched by military, aerospace and other fields. Piezoelectric ceramics have good dielectric properties and are an integral part of Multilayer Ceramic Capacitors (MLCC). However, commonly used barium titanate (BaTiO 3 , BT) The Curie temperature of dielectric ceramics is extremely low (~100°C), and the application occasions are greatly limited. [0003] Potassium sodium niobate (K 0.5 Na 0.5 NbO 3 , KNN)-based lead-free piezoelectric ceramics have received extensive attention from researchers. Howev...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622C04B41/88C04B35/64H01L41/187H01L41/273H01L41/43
CPCC04B35/495C04B35/622C04B41/5116C04B41/88C04B35/64C04B2235/442C04B2235/3251C04B2235/3255H10N30/8542H10N30/053H10N30/097
Inventor 林枞邓宝玉吴啸高旻赵纯林
Owner FUZHOU UNIV