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Preparation method of textured potassium sodium niobate based lead-free piezoelectric ceramics

A potassium sodium niobate-based, lead-free piezoelectric technology is applied in the field of lead-free piezoelectric ceramic preparation, which can solve the problems of affecting grain orientation, complex process, uneven thickness, etc., achieving good stability and simplifying the preparation process. , the effect of low cost

Active Publication Date: 2016-01-06
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the operation of the casting process, the preparation of the slurry is very complicated, including solvents, binders, plasticizers, dispersants and other additives; bubbles must be eliminated before use; the drying process needs to be carried out slowly in a solvent atmosphere. dry
This is because the cast film layer is thick (above 0.1mm). If the slurry is not well controlled, the grain orientation will be seriously affected, resulting in cracking of the film layer, uneven thickness, etc., and the process is very complicated.

Method used

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  • Preparation method of textured potassium sodium niobate based lead-free piezoelectric ceramics
  • Preparation method of textured potassium sodium niobate based lead-free piezoelectric ceramics
  • Preparation method of textured potassium sodium niobate based lead-free piezoelectric ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Slurry preparation: 6.74 g of ethyl cellulose was dissolved in 149.39 g of terpineol, heated and stirred until the ethyl cellulose was completely dissolved to form a transparent solution. Weigh 9.558gNa 2 CO 3 , 13.834gK 2 CO 3 , 50.758gNb 2 o 5 Mix it with 0.3g CuO and pre-fire at 800°C, then add it to the above solution, and ball mill it for 2 hours to mix well. Then 2.746gNaNbO 3 The flaky template grains were added into the slurry, and ball milling was continued for 30 minutes.

[0049] (2) Screen printing: screen-print the configured slurry on the polyester film, put it in an oven at 100°C for drying, repeat the screen printing and drying for about 40 to 50 times, and finally form a 0.2mm ceramic film .

[0050] (3) Molding: Cut the obtained ceramic membrane into a square piece of 11 mm×11 mm, remove the membrane piece from the substrate, overlap about 50 layers, and press into shape.

[0051] (4) Plastic discharge sintering: put the above-mentioned ce...

Embodiment 2

[0054] (1) Slurry preparation: 5.68 g of ethyl cellulose was dissolved in 125.98 g of terpineol, heated and stirred until the ethyl cellulose was completely dissolved to form a transparent solution. Weigh 9.688gNa 2 CO 3 , 10.648gK 2 CO 3 , 0.522gLi 2 CO 3 , 39.269gNb 2 o 5 , 7.734gTa 2 o 5 , 3.073gSb 2 o 3 Add 36.9g KCl and 34.2g NaCl and mix, react at 770°C for 2 hours, use deionized water to wash off the remaining molten salt, and obtain 57.768g of K 0.44 Na 0.52 Li 0.04 (Nb 0.84 Ta 0.1 Sb 0.06 )O 3 Ceramic powder. Add this powder into the above transparent solution, and mix well by ball milling for 2 hours.

[0055] (2) Screen printing: screen-print the configured slurry on the polyester film, put it in an oven at 100°C for drying, repeat the screen printing and drying for about 40 to 50 times, and finally form a 0.2mm ceramic film .

[0056] (3) Molding: Cut the obtained ceramic membrane into a square piece of 11 mm×11 mm, remove the membrane piece fro...

Embodiment 3

[0060] (1) Slurry preparation: Dissolve 8.88 g of ethyl cellulose in 196.97 g of terpineol, heat and stir until the ethyl cellulose is completely dissolved to form a transparent solution. Weigh 12.014gNa 2 CO 3 , 15.202gK 2 CO 3 , 0.739gLi 2 CO 3 , 51.388gNb 2 o 5 , 11.047gTa 2 o 5 , 4.347gSb 2 o 3 Mix it with 0.36g CuO and pre-calcine at 800°C, add it to the above solution, and ball mill for 2 hours to mix well. Then 5.464gNaNbO 3 The flaky template grains were added into the slurry, and ball milling was continued for 30 minutes.

[0061] (2) Screen printing: screen-print the configured slurry on the polyester film, put it in an oven at 100°C for drying, repeat the screen printing and drying for about 40 to 50 times, and finally form a 0.2mm ceramic film .

[0062] (3) Molding: Cut the obtained ceramic membrane into a square piece of 11 mm×11 mm, remove the membrane piece from the substrate, overlap about 50 layers, and press into shape.

[0063] (4) Plastic di...

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Abstract

The invention relates to a method for preparing textured potassium niobate sodium-based leadless piezoelectric ceramic and belongs to the field of preparation of leadless piezoelectric ceramic. The method comprises the following steps of: preparing power and obtaining slurry by taking flaky NaNbO3 or flaky KnbO3 as a template or a non-type template and selecting powder of Na2CO3, K2CO3, Li2CO3, Nb2O5, Ta2O5, Sb2O3 according to a chemical formula, namely, [(KmNa1-m)1-xLix](Nb1-y-zTaySbz)O33; laminating and pressing a plurality layers of thick ceramic films obtained by screen printing so as to obtain a biscuit; removing plastic from the biscuit; and sintering the biscuit from which the plastic is removed. A printing process is simple, the textured potassium niobate sodium-based leadless piezoelectric ceramic with a very high degree of orientation can be obtained and the highest degree of orientation factor is up to 90 percent.

Description

technical field [0001] The invention relates to a preparation method of textured potassium sodium niobate-based lead-free piezoelectric ceramics, belonging to the field of preparation of lead-free piezoelectric ceramics. Background technique [0002] Piezoelectric ceramics have mechanical resonance characteristics and energy conversion capabilities, and are used in many high-tech fields such as electronics, medical treatment, and aerospace, as well as in different fields of human daily life. Most of the piezoelectric ceramics used on a large scale now are lead-containing ceramics, such as lead zirconate titanate (PZT). Although these lead-based piezoelectric ceramics have excellent piezoelectric properties, the toxicity of lead and its environmental pollution have caused more and more serious harm to human society. Major industrial countries are competing to develop new environmentally friendly high-performance lead-free ceramics. Piezoelectric Ceramics. [0003] Among man...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 李永祥伍萌佳王东李亚利惠春
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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