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NP0 type dielectric ceramic with high dielectric constant

A high dielectric constant, dielectric ceramic technology, applied in the direction of fixed capacitor dielectrics, circuits, capacitors, etc., can solve the problem of high sintering temperature, achieve the effect of low sintering temperature, stable temperature coefficient, and improved chemical stability

Active Publication Date: 2019-11-22
李吉晓
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the capacity temperature coefficient of this system is a positive number, and a compensator with a negative capacity temperature coefficient is required, so the sintering temperature of this system is too high, so it needs to be improved

Method used

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  • NP0 type dielectric ceramic with high dielectric constant
  • NP0 type dielectric ceramic with high dielectric constant

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Effect test

Embodiment 1

[0030] A kind of high dielectric constant NP0 type dielectric ceramics, comprising the following raw materials by weight: 5g of magnesium metatitanate (MgTiO 3 ), 5g of calcium titanate (CaTiO 3 ), 5g of titanium dioxide (TiO 2 ), 5g of neodymium trioxide (Nd 2 o 3 ), 50g of sintering aids and 5g of modified additives, the sintering aids are preferably boron oxide (B 2 o 3 ), the modification additive is preferably zirconium dioxide (ZrO 2 ).

[0031] Add grinding balls and ball milling media to the above mixed powder, wherein the mass ratio of the mixed powder, grinding balls and ball milling media is a ratio of 1:1:2, the grinding balls are zirconia ceramic balls, and the ball milling media is Deionized water: After the mixed powder, grinding balls and deionized water are ball milled and calcined, polyvinyl alcohol (PVA) with a mass percentage of 2% is added.

Embodiment 2

[0033] A kind of high dielectric constant NP0 type dielectric ceramics, comprising the following raw materials by weight: 100g of magnesium metatitanate (MgTiO 3 ), 60g of calcium titanate (CaTiO 3 ), 30g of titanium dioxide (TiO 2 ), 120g of neodymium trioxide (Nd 2 o 3 ), 60g of sintering aids and 60g of modified additives, the sintering aids are preferably bismuth oxide (Bi 2 o 3 ), the modification additive is preferably niobium pentoxide (Nb 2 o 5 ).

[0034] Add grinding balls and ball milling media to the above mixed powder, wherein the mass ratio of the mixed powder, grinding balls and ball milling media is a ratio of 1:1:2, the grinding balls are zirconia ceramic balls, and the ball milling media is Deionized water: After the mixed powder, grinding balls and deionized water are ball milled and calcined, polyvinyl alcohol (PVA) with a mass percentage of 2% is added.

Embodiment 3

[0036] A kind of high dielectric constant NP0 type dielectric ceramics, comprising the following raw materials by weight: 120g of magnesium metatitanate (MgTiO 3 ), 80g of calcium titanate (CaTiO 3 ), 50g of titanium dioxide (TiO 2 ), 180g of neodymium trioxide (Nd 2 o 3 ), 80g of sintering aids and 120g of modified additives, the sintering aids are preferably bismuth oxide (Bi 2 o 3 ), the modification additive is preferably niobium pentoxide (Nb 2 o 5 ).

[0037] Add grinding balls and ball milling media to the above mixed powder, wherein the mass ratio of the mixed powder, grinding balls and ball milling media is a ratio of 1:1:2, the grinding balls are zirconia ceramic balls, and the ball milling media is Deionized water: After the mixed powder, grinding balls and deionized water are ball milled and calcined, polyvinyl alcohol (PVA) with a mass percentage of 2% is added.

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PUM

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Abstract

The invention discloses an NP0 type dielectric ceramic with a high dielectric constant. The NP0 type dielectric ceramic comprises 5 to 250 parts of magnesium metatitanate (MgTiO3), 5 to 150 parts of calcium titanate (CaTiO3), 5 to 100 parts of titanium dioxide (TiO2), 5 to 350 parts of neodymium oxide (Nd2O3), 5 to 200 parts of a modification additive and 50 to 120 parts of a sintering aid. The ceramic has the advantages of very stable temperature coefficient, low sintering temperature, a high dielectric constant, small dielectric loss and the like.

Description

technical field [0001] The invention relates to the technical field of ceramic compositions, more specifically, it relates to a high dielectric constant NPO type dielectric ceramic. Background technique [0002] The dielectric materials in capacitors can be divided into two categories according to the temperature stability of capacity, namely Class I ceramic capacitors and Class II ceramic capacitors. Among them, X5R, X7R, X8R, Y5V and Z5U belong to Class II ceramics, Class II ceramics The dielectric constant of capacitors is generally greater than 1000, and its electrical performance is relatively stable. It is suitable for DC blocking, coupling, bypass, and medium and low frequency occasions that require high reliability, as well as occasions that do not require high capacity stability and loss; Compared with the above, NP0 belongs to Class I ceramics and has temperature compensation characteristics. The dielectric constant of Class I ceramic capacitors is generally less t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/465C04B35/01C04B35/626C04B35/634C04B35/64H01B1/16H01G4/12H01G4/30
CPCC04B35/465C04B35/01C04B35/6261C04B35/63416C04B35/64H01B1/16H01G4/1227H01G4/30C04B2235/3206C04B2235/3208C04B2235/3236C04B2235/3232C04B2235/3224C04B2235/3298C04B2235/3251C04B2235/3217C04B2235/3244C04B2235/3409C04B2235/656
Inventor 李吉晓何建成李岩
Owner 李吉晓
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