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High-temperature ceramic capacitor dielectric material and preparation method thereof

A technology of capacitor dielectric and high-temperature ceramics, which is applied in the field of functional ceramic materials, can solve problems such as increased device loss, and achieve the effects of reducing dielectric loss, increasing density, and reducing loss

Active Publication Date: 2016-03-02
FUJIAN TORCH ELECTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the patent published by Sichuan Hongming (200810046591.0), its TCC change is less than ±15% at -55°C and 250°C, and the formula porcelain powder claims to directly add 8-16% Bi 2 o 3 , a high content of bismuth will lead to unnecessary element substitution during the later silver plating of ceramic capacitors, resulting in increased device loss

Method used

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  • High-temperature ceramic capacitor dielectric material and preparation method thereof
  • High-temperature ceramic capacitor dielectric material and preparation method thereof
  • High-temperature ceramic capacitor dielectric material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Weigh 52.26gBi 2 o 3 , 11.89gNa 2 CO 3 and 35.85g TiO 2 , mixed with ball milling, sieving, and calcined at 800°C for 4 hours to synthesize sodium bismuth titanate; the main component of sodium bismuth titanate is Bi 0.5 Na 0.5 TiO 3 , containing a small amount of Bi 0.6 Na 0.4 TiO 3 and Bi 0.4 Na 0.6 TiO 3 , Sodium bismuth titanate in other embodiments is the same.

[0041] (2) 81.49g of barium titanate and 18.5g of bismuth sodium titanate were weighed, mixed by ball milling, dried, crushed through a 40-mesh sieve, and calcined at 1200°C for 3 hours to synthesize a eutectic compound;

[0042] (3) Weigh 49.52g CaCO 3 , 6.65gMgO and 43.84gNb 2 o 5 , mixed by ball milling, dried, crushed through a 40-mesh sieve, and calcined at 1180°C for 3 hours to synthesize Ca(Mg 1 / 3 ,Nb 2 / 3 )O 3 ;

[0043] (4) 35.26gCaCO 3 , 43.57gH 3 BO 3 and 21.17gSiO 2 Weighing, ball milling with alcohol as the medium, drying, crushing through a 40-mesh sieve, and calcini...

Embodiment 2

[0046] (1) Weigh 52.26gBi 2 o 3 , 11.89gNa 2 CO 3 and 35.85g TiO 2 , mixed ball milling, sieving, and calcining at 900°C for 2 hours to synthesize sodium bismuth titanate;

[0047] (2) Weigh 83.49g of barium titanate and 16.51g of bismuth sodium titanate, mix them by ball milling, dry, crush and pass through a 40-mesh sieve, and calcinate at 1140°C for 6 hours to synthesize a eutectic compound;

[0048] (3) Weigh 13.17gMgO and 86.83gNb 2 o 5 , mixed by ball milling, dried, crushed through a 40-mesh sieve, and calcined at 800°C for 3 hours to synthesize MgNb 2 o 6 ;

[0049] (4) Weigh 35.26g CaCO 3 , 43.57gH 3 BO 3 and 21.17gSiO 2 Weighing, ball milling with alcohol as the medium, drying, crushing through a 40-mesh sieve, and calcining at 500°C for 4 hours to synthesize CaSiB 2 o 6 ;

[0050] (5) Weigh 95.68g eutectic compound, 4.0gMgNb 2 o 6 , 0.19gEr 2 o 3 , 0.4gMnO 2 , 4.0gCaSiB 2 o 6 , for batching. Grinding with 2mm yttrium-stabilized zirconium balls...

Embodiment 3

[0052] (1) Weigh 52.26gBi 2 o 3 , 11.89gNa 2 CO 3 and 35.85gTiO 2 , mixed ball milling, sieving, and calcining at 850°C for 3 hours to synthesize sodium bismuth titanate;

[0053] (2) Weigh 86.25g of barium titanate and 13.75g of bismuth sodium titanate, mix them by ball milling, dry them, crush them through a 40-mesh sieve, and calcinate at 1140°C for 2 hours to synthesize a eutectic compound;

[0054] (3) Weigh 13.17gMgO and 86.83gNb 2 o 5 , mixed by ball milling, dried, crushed through a 40-mesh sieve, and calcined at 800°C for 3 hours to synthesize MgNb 2 o 6 ;

[0055] (4) 35.26gCaCO 3 , 43.57gH 3 BO 3 and 21.17gSiO 2 Weighing, ball milling with alcohol as the medium, drying, crushing through a 40-mesh sieve, and calcining at 500°C for 4 hours to synthesize CaSiB 2 o 6 ;

[0056] (5) Weigh 95.73g eutectic compound, 4.9gMgNb 2 o 6 , 0.2gEr 2 o 3 , 0.24gMnO 2 , 3gCaSiB 2 o 6 , for batching. Grinding with 2mm yttrium-stabilized zirconium balls for 6 ho...

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Abstract

The invention discloses a high-temperature ceramic capacitor dielectric material and a preparation method thereof. A ceramic capacitor prepared from the material works at the temperature of -55 DEG C to 250 DEG C. The dielectric material is prepared from, by weight, 100 parts of [(1-x)BaTiO3-xBiyNazTiO3], 4-6 parts of NbO, 0.1-0.5 part of RE2O3, 0.05-0.15 part of MnO2 and 2-4 parts of CaSiB2O6, wherein x ranges from 0.08-0.20, y ranges from 0.4-0.6, z ranges from 0.4-0.6, the mole ratio of BaTiO3 to BiyNazTiO3 in [(1-x)BaTiO3-xBiyNazTiO3] is (1-x) to x, NbO is niobium-containing oxide including one or more of MgNb2O6, ZnNb2O6, Ca(Mg1 / 3,Nb2 / 3)O3 and Ba(Mg1 / 3,Nb2 / 3)O3, and RE is one or more of Y, Nd and Er. The high-temperature ceramic capacitor dielectric material has the advantages that the dielectric constant is larger than or equal to 800, dielectric loss is low, and temperature stability (-15%<=deltaC / C<=15%) is high.

Description

technical field [0001] The invention relates to the technical field of functional ceramic materials, in particular to a high-temperature ceramic capacitor dielectric material and a preparation method thereof. Background technique [0002] In the future, in the field of high temperature control and high temperature sensing, the working temperature of ceramic capacitors will be higher and higher. With the improvement of people's awareness of fuel economy and environmental protection, future engines require more effective energy control, which requires the engine control circuit to be able to withstand higher operating temperatures. The operating temperature range of ceramic capacitors as electronic components is particularly important . At present, X7R type ceramic capacitors are widely used and cannot withstand the working temperature higher than 125°C, while the relatively reliable maximum working temperature of X8R and X9R is only 200°C. [0003] At present, most of the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622
Inventor 陈永虹林志盛宋运雄黄祥贤谢显斌吴金剑许金飘
Owner FUJIAN TORCH ELECTRON TECH CO LTD
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