High-dielectric-constant X8R type MLCC medium material and preparing method thereof

A technology of high dielectric constant and dielectric material, applied in high dielectric constant X8R type MLCC dielectric material and its preparation, medium and low temperature sintering high dielectric constant X8R type MLCC dielectric material and its preparation field, can solve the problem of high loss, Achieve the effects of reducing the capacity temperature change rate, increasing the Curie temperature, and increasing the insulation resistivity

Active Publication Date: 2014-01-01
FUJIAN TORCH ELECTRON TECH CO LTD
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  • Abstract
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Problems solved by technology

Although Na 0.5 Bi 0.5 TiO 3 The Curie point is higher, and the modified barium titanate does increase the Curie temperature of barium titanate, but due to

Method used

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  • High-dielectric-constant X8R type MLCC medium material and preparing method thereof
  • High-dielectric-constant X8R type MLCC medium material and preparing method thereof
  • High-dielectric-constant X8R type MLCC medium material and preparing method thereof

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[0036] The present invention will be further described below through specific embodiments.

[0037] A preparation method of high dielectric constant X8R type MLCC dielectric material:

[0038] (1) The Nb 2 O 5 It is proportioned with ZnO according to the Zn / Nb atomic molar ratio 1:1, weighed, mixed, sieved and calcined at 800~900℃, ball milled and dried to obtain ZnNb 2 O 5 ;

[0039] (2) According to the chemical formula MBi 4 Ti 4 O 15 , M is one or more of Sr, Ca and Ba, for TiO 2 , Bi 2 O 3 , SrCO 3 , BaCO 3 With CaCO 3 Proportioning to make MBi 4 Ti 4 O 15 ;

[0040] (3) According to the following proportion by weight: 35~42 parts Bi 2 O 3 , 8-14 parts ZnO, 8-12 parts CaCO 3 , 20~25 parts H 3 BO 3 , 4~8 parts SiO 2 And 7-11 parts Li 2 CO 3 , Proportioning, weighing, mixing, sieving and melting at 1000 ~ 1100 ℃, then water quenching, grinding and sieving to obtain flux glass powder;

[0041] (4) Combine ZnO and SiO 2 According to the Zn / Si atomic molar ratio of 2:1, Zn is obtained b...

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Abstract

The invention discloses a high-dielectric-constant X8R type MLCC medium material. 100 parts, by weight, of barium titanate are used as base materials which are added with, by weight, 0.5-1.5 parts of niobium zinc compound, 1.5-2.5 parts of MBi4Ti4O15, 0.3-0.75 part of zirconic oxide, 3-4 parts of flux glass powder, 1-2 parts of silicon zinc compound, 0-0.2 part of manganic carbonate and 0-0.2 part of one or more of oxides of Er, Yb, Dy, Ho and Nd. M is one or more of Sr, Ca and Ba. According to the high-dielectric-constant X8R type MLCC medium material, a proper amount of niobium zinc compounds are added to easily form a core-shell structure. The core-shell structure can facilitate stability of the medium temperature of a medium material and reduce the temperature coefficient of capacitance of the material.

Description

technical field [0001] The invention belongs to the field of ceramic functions, and relates to a high dielectric constant X8R type MLCC dielectric material and a preparation method thereof, in particular to a medium-low temperature sintered high dielectric constant X8R type MLCC dielectric material and a preparation method thereof. Background technique [0002] MLCC is the English abbreviation of chip multilayer ceramic capacitors (Multi-layer ceramic capacitors). According to temperature characteristics, material, production process. MLCC can be divided into the following types: NPO, COG, Y5V, Z5U, X7R, X5R, etc. NPO and COG have stable temperature characteristics, small capacitance and high price; Y5V and Z5U have large temperature characteristics, large capacitance and low price; X7R and X5R are between the above two. [0003] In recent years, X7R (operating temperature range -55 ° C ~ 125 ° C, capacity temperature change rate within ± 15%) MLCC materials have been exte...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/622
Inventor 黄祥贤吴金剑张子山谢显斌宋运雄
Owner FUJIAN TORCH ELECTRON TECH CO LTD
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