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A kind of high-voltage ceramic capacitor material with npo characteristics and preparation method thereof

A technology of high-voltage ceramics and capacitors, which is applied in the field of high-voltage ceramic materials, can solve the problems of reducing the overall dielectric constant of ceramics, the decline of ceramic dielectric properties, and the low dielectric constant of glass phase, so as to ensure the dielectric constant, reduce the sintering temperature, Effect of small temperature coefficient

Active Publication Date: 2021-01-05
北京智罗盘智能电气有限公司
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Problems solved by technology

While adding low-melting point sintering aids to reduce the sintering temperature, the dielectric properties of the prepared ceramics are also reduced to varying degrees. The main reason is that there is a chemical reaction between the main crystal phase of the ceramic and the glass phase. The phase content is reduced, or impurity phases are produced; in addition, the dielectric constant of the glass phase itself is low, and the introduction of the glass phase reduces the dielectric constant of the ceramic as a whole

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  • A kind of high-voltage ceramic capacitor material with npo characteristics and preparation method thereof
  • A kind of high-voltage ceramic capacitor material with npo characteristics and preparation method thereof
  • A kind of high-voltage ceramic capacitor material with npo characteristics and preparation method thereof

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preparation example Construction

[0017] The present invention also proposes the preparation method of above-mentioned ceramic material, comprises the following steps:

[0018] (1) BaO or BaCO 3 、Nd 2 o 3 、TiO 2 Mix evenly according to the molar ratio of 1:1:5, and calcinate at a high temperature of 1050-1100°C for 1 hour to form a ceramic phase powder BaNd with a negative temperature coefficient (-150--300ppm / °C). 2 Ti 5 o 14 ;

[0019] (2) PbO, Nb 2 o 5 Mix evenly according to the molar ratio of 1:1, and calcinate at a high temperature of 900-950°C for 1 hour to form a ceramic phase powder PbNb with a positive temperature coefficient (100-150ppm / °C) 2 o 6 ;

[0020] (3) will Bi 2 o 3 , PbO, BaO or BaCO 3 , SiO 2 Mix evenly according to the molar ratio of 1-2:3-6:4-6:6-10, melt at 1200-1300°C for 3 hours, pour into deionized water to make glass slag, and ball mill for 8 hours to get glass powder body;

[0021] (4) Mix the three powders prepared above according to the molar ratio of 32-43:38-52...

Embodiment 1-3

[0025] (1) Select analytically pure BaCO 3 、Nd 2 o 3 、TiO 2 As the raw material, according to the molar ratio of 1:1:5, the ingredients are separately mixed, using absolute ethanol as the dispersion medium, zirconia balls as the grinding medium, and mixing in a nylon tank with a three-roller mixer for 12 hours, and the uniformly mixed slurry Dry in an oven at 80°C, and then sinter the uniformly mixed powder in a sintering furnace at 1100°C for 1 hour to obtain a ceramic phase powder with a negative temperature coefficient BaNd 2 Ti 5 o 14 .

[0026] (2) Select analytically pure PbO and Nb 2 o 5 As raw materials, according to the molar ratio of 1:1, carry out batching respectively, use absolute ethanol as the dispersion medium, zirconia balls as the grinding medium, use a three-roller mixer in a nylon tank to mix for 12 hours, and mix the uniform slurry at 80 ℃ oven, and then calcined the uniformly mixed powder in a sintering furnace at 900 ℃ for 1 hour to obtain a posi...

Embodiment 4-6

[0030] (1) Select analytically pure BaCO 3 、Nd 2 o 3 、TiO 2As raw materials, according to the molar ratio of 1:1:5, carry out batching separately, use absolute ethanol as the dispersion medium, zirconia balls as the grinding medium, use a three-roller mixer in a nylon tank to mix for 12 hours, and mix the uniform slurry Dry in an oven at 80°C, and then sinter the uniformly mixed powder in a sintering furnace at 1050°C for 1 hour to obtain a ceramic phase powder with a negative temperature coefficient BaNd 2 Ti 5 o 14 .

[0031] (2) Select analytically pure PbO and Nb 2 o 5 As raw materials, according to the molar ratio of 1:1, carry out batching respectively, utilize absolute ethanol as dispersion medium, zirconia ball as grinding medium, adopt three-roller mixer to mix in nylon tank for 12 hours, mix the uniform slurry at 80 ℃ oven, and then the mixed powder was calcined in a sintering furnace at 950 ℃ for 1 hour to obtain a positive temperature coefficient ceramic ph...

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Abstract

The invention provides a high-tension ceramic capacitor material with NPO characteristics and a preparation method therefor and belongs to the technical field of high-tension ceramics. The ceramic material is prepared from the chemical ingredients: BaNd2Ti5O14, PbNb2O6, Bi2O3, PbO, BaO and SiO2 which are in the mole ratio of (32 to 43): (38 to 52): (1 to 2): (3 to 6): (4 to 6): (6 to 10). According to the method, a BaNd2Ti5O14 ceramic phase with a negative temperature coefficient and a tungsten bronze structured PbNb2O6 ceramic phase with a positive temperature coefficient are compounded at approximate room temperature to achieve a small temperature coefficient; and meanwhile, through adding low-melting-point glass, the sintering temperature is lowered, the reaction between the two ceramicphases is reduced, and a big dielectric constant is guaranteed. The ceramic material provided by the invention has the dielectric constant of 95 to 121, the dielectric loss smaller than 0.002 and thetemperature coefficient smaller than + / -30ppm / DEG C and is suitable for being applied to capacitors of electronic type voltage transformers.

Description

technical field [0001] The invention belongs to the technical field of high-voltage ceramic materials, and in particular relates to a high-voltage ceramic capacitor medium with NPO (Negative-Positive-Zero) characteristics and a preparation method thereof. Background technique [0002] Potential transformer is one of the important equipment used for electric energy metering and relay protection in power system. Its measurement accuracy and reliability have an important impact on the safety, stability and economic operation of power system. With the vigorous development of distribution network intelligence, traditional electromagnetic voltage transformers have seriously restricted the digital construction of distribution network due to their complex insulation, large size, narrow measurement linear range and prone to ferromagnetic resonance. Electronic voltage transformers have been well developed and applied in the construction of intelligent distribution network in recent ye...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/462C04B35/497
CPCC04B35/462C04B35/497C04B2235/3215C04B2235/3251C04B2235/3296C04B2235/3298C04B2235/3418C04B2235/9607
Inventor 齐开丽
Owner 北京智罗盘智能电气有限公司
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