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A lead-free piezoelectric ceramic for gas ignition and its manufacturing process

A lead-free piezoelectric and manufacturing process technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problems of chaotic XRD crystal plane index and complex structure, and achieve long service life , Improve mass transfer speed, improve the effect of homogenization and densification

Active Publication Date: 2021-09-21
嘉兴清锋新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Compared with conventional PZT, the undoped K 0.5 Na 0.5 NbO 3 The structure of ceramics is relatively complex, and the XRD crystal plane index disorder has appeared many times in the literature on potassium sodium niobate (KNN) based ceramics

Method used

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  • A lead-free piezoelectric ceramic for gas ignition and its manufacturing process
  • A lead-free piezoelectric ceramic for gas ignition and its manufacturing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: A kind of lead-free piezoelectric ceramics for gas ignition, chemical composition formula is: (K 0.5 Na 0.3 Ca 0.1 ) (Nb 0.9 co 0.5 / 3 )O 3 , its raw materials include: potassium carbonate, sodium carbonate, niobium pentoxide and auxiliary materials; auxiliary materials are cobalt trioxide and calcium carbonate.

[0027] A manufacturing process for a lead-free piezoelectric ceramic for gas ignition, comprising the following steps:

[0028] (a) Weigh the raw materials according to the molar ratio in the general formula, put them into a ball mill, then add absolute ethanol, stir and refine the pulp, the speed of the ball mill is 450rpm, and last for 35h to obtain a slurry;

[0029] (b) Pressure filter the slurry into blocks, put it into a sintering furnace, and pre-sinter at 900°C for 14 hours to obtain a pre-sintered material;

[0030] (c) The pre-sintered material is dry-pressed into a sintering furnace in an oxygen atmosphere at 950°C, the sintering ...

Embodiment 2

[0033] Embodiment 2: A kind of lead-free piezoelectric ceramics for gas ignition, chemical composition formula is: (K 0.45 Na 0.4 Ca 0.075 ) (Nb 0.85 co 0.5 / 3 mn 0.25 / 4 )O 3 , its raw materials include: potassium carbonate, sodium carbonate, niobium pentoxide and auxiliary materials; auxiliary materials are cobalt trioxide, manganese dioxide and calcium carbonate.

[0034] A manufacturing process for a lead-free piezoelectric ceramic for gas ignition, comprising the following steps:

[0035] (a) Weigh the raw materials according to the molar ratio in the general formula, put them into a ball mill, then add absolute ethanol, stir and refine the pulp, the speed of the ball mill is 500rpm, and last for 35h to obtain a slurry;

[0036](b) Pressure filter the slurry into blocks, put it into a sintering furnace, and pre-sinter at 900°C for 12 hours to obtain a pre-sintered material;

[0037] (c) The pre-sintered material is dry-pressed into a sintering furnace in an oxygen at...

Embodiment 3

[0040] Embodiment 3: A kind of lead-free piezoelectric ceramics for gas ignition, chemical composition formula is: (K 0.42 Na 0.4 Ca 0.09 ) (Nb 0.9 co 0.25 / 3 mn 0.25 / 4 )O 3 , its raw materials include: potassium carbonate, sodium carbonate, niobium pentoxide and auxiliary materials; auxiliary materials are cobalt trioxide, manganese dioxide and calcium carbonate.

[0041] A manufacturing process for a lead-free piezoelectric ceramic for gas ignition, comprising the following steps:

[0042] (a) Weigh the raw materials according to the molar ratio in the general formula, put them into a ball mill, then add absolute ethanol, stir and refine for 35 hours to obtain a slurry;

[0043] (b) Pressure filter the slurry into blocks, put it into a sintering furnace, and pre-sinter at 900°C for 15 hours to obtain a pre-sintered material;

[0044] (c) The pre-sintered material is dry-pressed into a sintering furnace in an oxygen atmosphere at 950°C, the sintering pressure is 1.05MPa...

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Abstract

The invention relates to the technical field of lead-free piezoelectric materials, in particular to a lead-free piezoelectric ceramic used for gas ignition and its manufacturing process. When preparing lead-free piezoelectric ceramics, cobalt, manganese and calcium elements are used for doping instead of , and the method of composite addition to realize valence and vacancy compensation, activate piezoelectric domains, and improve piezoelectric properties of piezoelectric materials, thereby achieving high ignition voltage in potassium sodium niobate-based lead-free piezoelectric ceramics.

Description

technical field [0001] The invention relates to the technical field of lead-free piezoelectric materials, in particular to a lead-free piezoelectric ceramic used for gas ignition and a manufacturing process thereof. Background technique [0002] As an important class of functional ceramics, piezoelectric ceramics have been widely used in technical fields such as electronic information, ultrasonic transducers, sensors, and nondestructive testing. Piezoelectric materials and devices have the function of realizing the direct conversion of electrical energy and mechanical energy. The principle is to use the positive piezoelectric effect. When the piezoelectric ceramic column is squeezed or impacted along the polarization direction, it will be compressed and deformed, resulting in ceramic The bound charges of opposite signs appear on the two ends of the column; the generated charges flow through the wire and generate a discharge spark in the electrode gap, thereby igniting the fl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/187C04B35/495C04B35/622C04B41/88
CPCC04B35/495C04B35/622C04B41/009C04B41/5116C04B41/88C04B2235/3201C04B2235/3208C04B2235/3267C04B2235/3275C04B2235/602C04B2235/656C04B2235/6567C04B2235/6583C04B2235/95
Inventor 龚文吴超峰
Owner 嘉兴清锋新材料有限公司