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Low-potential-gradient voltage-sensitive-capacitance dual-functional titanium dioxide ceramic material and preparing method thereof

A technology of titanium dioxide and ceramic materials, which is applied in the field of low-potential gradient varistor-capacitance dual-functional titanium dioxide ceramic materials and its preparation, can solve the problems of increasing production costs and increasing the process, achieving small potential gradients, simplifying the sintering process, and comprehensive good performance effect

Active Publication Date: 2016-03-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN200510010756.5 announced the low potential gradient material, the potential gradient is between 4 ~ 7V / mm, and the dielectric constant is (3 ~ 7) × 10 4 , but it adopts the nano-modification method, which increases the process and increases the production cost

Method used

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  • Low-potential-gradient voltage-sensitive-capacitance dual-functional titanium dioxide ceramic material and preparing method thereof
  • Low-potential-gradient voltage-sensitive-capacitance dual-functional titanium dioxide ceramic material and preparing method thereof
  • Low-potential-gradient voltage-sensitive-capacitance dual-functional titanium dioxide ceramic material and preparing method thereof

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Embodiment 1

[0027] Micron-sized powder according to 99.0mol%TiO 2 , Nb 2 o 5 0.6mol%, 0.3mol%SiO 2 , 0.1mol%Sm 2 o 3 Proportional weighing, after mixing, add to the agate grinding tank, add absolute ethanol as a lubricant, wet ball mill until the powder is fully mixed, and dry the fully mixed powder at 60°C. Add 5.wt% polyvinyl alcohol (PVA) as a binder, and dry press it into a green body. The green body is placed in the furnace and slowly heated to 400°C for 1 hour for debinding treatment, then heated to 1450°C for 2 hours, then cooled to room temperature with the furnace, and kept at 870°C for 1 hour to burn silver electrodes. The resulting titanium dioxide ceramics were tested for performance, and the potential gradient (E 1mA ) is 9.3V / mm, nonlinear coefficient (α) is 2.74, relative permittivity (ε r ) is 4.9 x 10 4 , the loss angle (tanδ) is 0.57.

Embodiment 2

[0029] Micron-sized powder according to 99.0mol%TiO 2 , 0.5%molNb 2 o 5 , 0.2mol%SiO 2 , 0.3%molSm 2 o 3 Proportional weighing. After mixing, put it into the agate grinding tank, add absolute ethanol as lubricant, wet ball mill until the powder is fully mixed, and dry the fully mixed powder at 70°C. Add 6.wt% polyvinyl alcohol (PVA) as a binder, and dry press it into a green body. The green body is placed in the furnace and slowly heated to 400°C for 1 hour for debinding treatment, then heated to 1450°C for 2 hours, then cooled to room temperature with the furnace, and kept at 870°C for 1 hour to burn silver electrodes. The resulting titanium dioxide ceramics were tested for performance, and the voltage gradient was (E 1mA ) 13.1V / mm, nonlinear coefficient (α) is 4.10, relative permittivity (ε r ) is 9.5 x 10 4 , the loss angle (tanδ) is 0.52.

Embodiment 3

[0031] Micron-sized powder according to 99.1%molTiO 2 , 0.6%molNb 2 o 5 , 0.1%molSiO 2 , 0.2%molSm 2 o 3 Proportional weighing. After mixing, put it into the agate grinding tank, add acetone as lubricant, wet ball mill until the powder is fully mixed, and dry the fully mixed powder at 75°C. Add 7.wt% polyvinyl alcohol (PVA) as a binder, and dry press it into a green body. The green body is placed in the furnace and slowly heated to 400°C for 1.5 hours for debinding treatment, then heated to 1350°C for 4 hours of heat preservation and sintering, then cooled to room temperature with the furnace, and kept at 870°C for 1 hour to burn silver electrodes. The resulting titanium dioxide ceramics were tested for performance, and the potential gradient (E 1mA ) is 9.8V / mm, the nonlinear coefficient (α) is 4.13, and the relative permittivity (ε r ) is 9.0 x 10 4 , the loss angle (tanδ) is 0.45.

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Abstract

The invention relates to a low-potential-gradient voltage-sensitive-capacitance dual-functional titanium dioxide ceramic material and a preparing method thereof, and belongs to the field of semiconductor electronic materials. The titanium dioxide ceramic material is characterized in that micron-sized titanium dioxide is used as a body, micron-sized additives including niobium pentoxide, silicon dioxide, samarium oxide, manganese dioxide and antimonous oxide are added, the mixture is fully mixed through wet ball grinding, dried, granulated, formed in a compression mode, subjected to rubber discharging at low temperature and sintered at high temperature to prepare voltage-sensitive-capacitance dual-functional titanium dioxide ceramic, wherein high valence ions such as niobium pentoxide and antimony pentoxide generated by converting antimonous oxide in an oxidized mode in the firing process are used for donor doping to achieve semi-conductivity of titanium dioxide crystalline grains, and samarium oxide and other low valence ions are used for acceptor doping to improve related electrical properties. The average size of the crystalline grains is larger than 9 micrometers, the potential gradient ranges from 2.3 V / mm to 13.1 V / mm, the nonlinear coefficient ranges from 2 to 4.13, the relative dielectric constant epsilon r ranges from 4.6*10<4> to 9.5*10<4> (1kHz), and the loss angle tan delta ranges from 0.11 to 0.57. The titanium dioxide ceramic material has low potential gradient and a good capacitance function.

Description

technical field [0001] The invention belongs to the field of semiconductor electronic materials, and relates to a low-potential gradient pressure-sensitive-capacitance dual-functional titanium dioxide ceramic material and a preparation method thereof. Background technique [0002] Varistor is a resistor device with non-linear volt-ampere characteristics. It is mainly used for voltage clamping when the circuit is under overvoltage, absorbing excess current to protect sensitive devices. Utilizing the nonlinear characteristics of varistor ceramics, when an overvoltage appears between the two poles of varistor ceramics, varistor ceramics can reduce the voltage to a relatively fixed voltage value, thereby realizing the protection of the subsequent circuit. The main parameters of varistor ceramics are: potential gradient (E 1mA ), nonlinear coefficient (α), relative permittivity (ε r )Wait. [0003] The most widely used varistor ceramics are zinc oxide varistor ceramics, which ...

Claims

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Application Information

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IPC IPC(8): C04B35/46
Inventor 朱达川李亚东
Owner SICHUAN UNIV
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