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A potassium sodium niobate-based lead-free piezoelectric ceramic and its manufacturing process and application

A potassium-sodium niobate-based, lead-free piezoelectric technology, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve the problem of harming human health and the ecological environment, unsatisfactory sound effects, etc., to reduce damage to human health and the environment, good sound effects, and low driving voltage

Active Publication Date: 2021-09-24
桐乡清锋科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing screen sound technology is to attach the vibrator to the middle frame of the mobile phone. The vibrator drives the middle frame to vibrate the screen to vibrate, and the sound effect is not ideal.
[0003] In addition, the piezoelectric vibration elements currently used are all made of lead zirconate titanate (PZT)-based piezoelectric materials, and the lead element in the lead zirconate titanate material accounts for nearly 70%. The process will seriously damage human health and ecological environment

Method used

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  • A potassium sodium niobate-based lead-free piezoelectric ceramic and its manufacturing process and application
  • A potassium sodium niobate-based lead-free piezoelectric ceramic and its manufacturing process and application
  • A potassium sodium niobate-based lead-free piezoelectric ceramic and its manufacturing process and application

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Experimental program
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Effect test

Embodiment 1

[0034] A kind of potassium niobate base lead-free piezoelectric ceramics, chemical composition is: 0.85 (K 0.5 Na 0.45 Li 0.05 )NbO 3 +0.15(Bi 0.5 Ag 0.5 )TiO 3 , its manufacturing process includes the following steps:

[0035] (1) Dehydration of raw materials: put potassium carbonate, sodium carbonate, niobium pentoxide, lithium carbonate, bismuth trioxide, titanium dioxide and silver oxide into a petri dish, place in an oven, keep warm at 150°C for 6 hours, and remove raw materials moisture in

[0036] (2) Mixing: Proportioning raw materials according to the chemical composition, dispersing in absolute ethanol, mixing by ball milling, the ball milling speed is 600rpm, and the ball milling time is 24h, after mixing evenly, dry, pulverize and sieve to make dry powder;

[0037] (3) Pre-calcination: put the dry powder in a box furnace and continuously heat up to 950°C, keep it warm for 12 hours, cool down to room temperature, crush and sieve to obtain pre-calcined powder;...

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Abstract

The invention relates to potassium sodium niobate (KNN)-based lead-free piezoelectric ceramics and its manufacturing process and its application in screen sound-generating components. The invention discloses a potassium-sodium niobate-based lead-free piezoelectric ceramic, which is prepared into a potassium-sodium niobate-based lead-free piezoelectric ceramic with high density and large piezoelectric response through a compound doping method and process adjustment. The present invention also provides a screen sound emitting element made of the above-mentioned potassium sodium niobate lead-free piezoelectric ceramic, through the design of the piezoelectric array, the screen can realize fixed-point sound generation.

Description

technical field [0001] The invention relates to the field of lead-free piezoelectric ceramic technology and screen sound generation technology, in particular to a potassium sodium niobate (KNN)-based lead-free piezoelectric ceramic and its manufacturing process and its application in screen sound generation components. Background technique [0002] The screen sound technology uses the vibration of the vibrator installed inside the mobile phone to drive the screen to vibrate to generate sound waves that are transmitted to the human ear. The use of screen sound technology can realize the need for a non-porous appearance of a full-screen mobile phone, and maximize the screen-to-body ratio of the mobile phone. The existing screen sound technology is to attach a vibrator to the middle frame of the mobile phone. The vibrator drives the middle frame to vibrate to vibrate the screen, and the sound effect is not ideal. [0003] In addition, the piezoelectric vibration elements curre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622H01L41/187H01L41/39
CPCC04B35/495C04B35/622C04B2235/3234C04B2235/3298C04B2235/3291C04B2235/3203C04B2235/3201C04B2235/6567H10N30/8542H10N30/8561H10N30/093
Inventor 龚文吴超峰
Owner 桐乡清锋科技有限公司
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