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Preparation method of nano-twinned silicon dioxide piezoelectric material

A technology of silicon dioxide and piezoelectric materials, applied in the field of preparation of nano-twinned silicon dioxide piezoelectric materials, which can solve the problems of small single crystal phase interface area and weak piezoelectricity

Active Publication Date: 2022-03-08
SHAANXI SCI TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the small quasi-isomorphic phase boundary area of ​​its single crystal, its piezoelectricity is weak

Method used

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  • Preparation method of nano-twinned silicon dioxide piezoelectric material
  • Preparation method of nano-twinned silicon dioxide piezoelectric material

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preparation example Construction

[0020] A kind of preparation method of nano-twin silicon dioxide piezoelectric material of the present invention, comprises the following steps:

[0021] (1) Put 99.9% high-purity silicon dioxide powder with a particle size of 23-35 microns in a high-temperature furnace to melt for 20-30 minutes at 1680-1730°C, and then pour it into a liquid nitrogen cryogenic device for rapid cooling. It is a tank-shaped container. The tank containing high-temperature silica liquid is soaked in flowing low-temperature liquid nitrogen. The flow rate of liquid nitrogen is 140-230 ml / min to obtain multi-crack silica bulk glass material;

[0022] (2) The multi-cracked silica block glass material is crushed and finely ground by a tungsten steel punching and grinding head to obtain glass powder with an average particle size of 43 nanometers. The impact force and impact frequency are 40-55 N and 2-4 Hz, respectively. The spindle speed of the head is 350-450 rpm, and finally a boron powder catalyst o...

Embodiment 1

[0025] (1) Put 99.9% high-purity silicon dioxide powder with a particle size of 23 microns in a high-temperature furnace to melt for 20 minutes at 1680°C, and then pour it into a liquid nitrogen cryogenic device for rapid cooling. The liquid nitrogen cryogenic device is a tank-shaped container , the tank containing the high-temperature silicon dioxide liquid is soaked in flowing low-temperature liquid nitrogen, and the flow rate of the liquid nitrogen is 140 ml / min to obtain a multi-crack silicon dioxide bulk glass material;

[0026] (2) The multi-crack silica bulk glass material is crushed and finely ground by a tungsten steel grinding head to obtain glass powder with an average particle size of 43 nanometers. The impact force and impact frequency are 40 N and 2 Hz, respectively, and the spindle speed of the grinding head is 350 RPM, and finally add 0.02 g / kg glass powder boron powder catalyst and process it in the Octahedron under ultra-high pressure and high temperature, the...

Embodiment 2

[0028] (1) Put 99.9% high-purity silicon dioxide powder with a particle size of 25 microns in a high-temperature furnace and melt it for 22 minutes at 1690°C, then pour it into a liquid nitrogen cryogenic device for rapid cooling. The liquid nitrogen cryogenic device is a tank-shaped container , the tank containing the high-temperature silicon dioxide liquid is soaked in flowing low-temperature liquid nitrogen, the flow rate of liquid nitrogen is 150 ml / min, and a multi-crack silicon dioxide bulk glass material is obtained;

[0029] (2) The multi-cracked silica bulk glass material is crushed and finely ground by a tungsten steel punching and grinding head to obtain glass powder with an average particle size of 43 nanometers. The impact force and impact frequency are 45 N and 3 Hz, respectively, and the spindle speed of the grinding head is 360 RPM, and finally add boron powder catalyst of 0.03 g / kg glass powder and process it in the Octahedron under ultra-high pressure and high...

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Abstract

The invention discloses a preparation method of a nano-twin silicon dioxide piezoelectric material. Firstly, the high-purity silicon dioxide powder is melted at high temperature and cooled rapidly with liquid nitrogen to obtain a multi-crack silicon dioxide block glass material, and then the silicon dioxide bulk glass material is obtained by punching. The nano-glass powder is obtained by crushing and finely grinding, and finally the catalyst is added and subjected to ultra-high pressure and high temperature treatment to finally obtain the nano-twinned silicon dioxide piezoelectric material. This method has high microstructure control precision, strong process stability and repeatability, and can achieve high performance of silica materials.

Description

technical field [0001] The invention relates to the technical field of piezoelectric material preparation, in particular to a preparation method of nano-twin silicon dioxide piezoelectric material. Background technique [0002] Silicon dioxide piezoelectric materials have good piezoelectric stability and high mechanical quality factor, and are often used in the production of high-frequency vibrators and ultrasonic transducers. However, due to the small quasi-isomorphic phase boundary area of ​​its single crystal, its piezoelectricity is weak. Therefore, finding a new method to increase the quasi-isomorphic phase boundary area is crucial to improve its piezoelectric performance. [0003] Through high-temperature melting, cryogenic treatment and high-temperature and high-pressure process optimization, the microstructure of silicon dioxide piezoelectric materials is refined, which is the key means to increase its quasi-isomorphic phase boundary area and improve its performance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/14C04B35/626C04B35/653
CPCC04B35/14C04B35/6261C04B35/653C04B2235/36C04B2235/421C04B2235/781C04B2235/96
Inventor 艾桃桃
Owner SHAANXI SCI TECH UNIV