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A low-potential gradient varistor-capacitance bifunctional titanium dioxide ceramic material and its preparation method

A technology of titanium dioxide and ceramic materials, applied in the direction of piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problems of increasing production costs and increasing the process, achieving small potential gradients and simplifying the sintering process , good overall performance

Active Publication Date: 2017-12-26
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN 200510010756.5 discloses the low potential gradient material, the potential gradient is between 4-7 V / 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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  • A low-potential gradient varistor-capacitance bifunctional titanium dioxide ceramic material and its preparation method
  • A low-potential gradient varistor-capacitance bifunctional titanium dioxide ceramic material and its preparation method
  • A low-potential gradient varistor-capacitance bifunctional titanium dioxide ceramic material and its preparation method

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Experimental program
Comparison scheme
Effect test

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 was placed in the furnace and slowly heated to 400 °C for 1 h for debinding treatment, then heated to 1450 °C for 2 h, then cooled to room temperature with the furnace, and kept at 870 °C for 1 h to burn silver electrodes. The resulting titanium dioxide ceramics were tested for performance, and the potential gradient (E 1mA ) is 9.3 V / mm, the nonlinear coefficient (α) is 2.74, and the 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 was placed in the furnace and slowly heated to 400 °C for 1 h for debinding treatment, then heated to 1450 °C for 2 h, then cooled to room temperature with the furnace, and kept at 870 °C for 1 h to burn silver electrodes. The resulting titanium dioxide ceramics were tested for performance, and the voltage gradient was (E 1mA ) 13.1 V / 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 was placed in a furnace and slowly heated to 400 °C for 1.5 h for debinding treatment, then heated to 1350 °C for 4 h, then cooled to room temperature with the furnace, and silver electrodes were fired at 870 °C for 1 h. The resulting titanium dioxide ceramics were tested for performance, and the potential gradient (E 1mA ) is 9.8 V / 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

A low-potential gradient varistor-capacitance dual-functional titanium dioxide ceramic material and a preparation method thereof, which belong to the field of semiconductor electronic materials, are characterized in that the material is mainly composed of micron-sized titanium dioxide, and added with micron-sized additives niobium pentoxide, Silicon, samarium oxide, manganese dioxide, and antimony trioxide are wet ball milled until fully mixed, dried, granulated, pressed, low-temperature debinding, and high-temperature sintering to prepare titanium dioxide varistor-capacitance dual-function ceramics. Use niobium pentoxide and high-valent ions such as antimony pentoxide generated by the oxidation transformation of antimony trioxide during the firing process as donor doping to realize semiconducting of titanium dioxide grains, and use low-valent ions such as samarium trioxide as donors. Acceptor doping improves related electrical properties. Its average grain size is greater than 9 μm, the potential gradient is between 2.3 and 13.1 V / mm, the nonlinear coefficient is between 2 and 4.13, and its relative permittivity εr is between 4.6×104 and 9.5×104 (1kHz) , The loss angle tanδ is between 0.11 and 0.57, with low potential gradient and 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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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/187C04B35/46
Inventor 朱达川李亚东
Owner SICHUAN UNIV
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