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X9R ceramic capacitor dielectric material and preparation method thereof

A technology for ceramic capacitors and dielectric materials, applied in the field of X9R type ceramic capacitor dielectric materials and their preparation, can solve problems such as inability to provide temperature dielectric properties, and achieve good industrialization prospects, simple process, and good temperature stability.

Active Publication Date: 2015-03-25
苏州弘吴科技中介服务有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most ceramic capacitors use X7R ceramic formula, but the capacity and temperature characteristics of this material have certain limitations. In the range of -55°C~+125°C, the capacitance change rate (ΔC / C25) ≤±15%, more than + At 125°C, the dielectric properties of the temperature cannot be provided

Method used

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  • X9R ceramic capacitor dielectric material and preparation method thereof
  • X9R ceramic capacitor dielectric material and preparation method thereof
  • X9R ceramic capacitor dielectric material and preparation method thereof

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Embodiment

[0016] BaCO with a purity of 99.99% 3 、Sm 2 o 3 , Nb 2 o 5 and Fe 2 o 3 The raw material is Ba according to the stoichiometric ratio 3.5 SM 1.5 Fe 0.75 Nb 9.25 o 30 The ingredients are put into the ball mill tank; the zirconia ball and the nylon tank are selected; the quality of the added raw material is 8% of the mass of the ball; the mixing ball milling time is 48 hours, the rotating speed is 350 rpm, and the ball milling medium is absolute ethanol; the obtained The product was dried in an oven at 100°C for 5 hours, and pre-sintered at 1200°C for 4 hours at a heating rate of 5°C / min; the pre-sintered powder was taken out and ground, and then ball milled with absolute ethanol as the ball milling medium for 48 hours. Mix evenly for 1 hour, dry at 100°C for 5 hours, grind into powder, use 5% polyvinyl alcohol aqueous solution as a binder to granulate, pass through a 60-mesh sieve, and press it into a diameter of 100MPa 12mm, thickness of 1mm disc-shaped green body, w...

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Abstract

The invention discloses an X9R ceramic capacitor dielectric material and a preparation method thereof. The preparation method comprises the following steps: niobium pentoxide, barium carbonate, ferric oxide and samarium oxide are subjected to ball milling firstly, raw materials are refined, burdening is performed at stoichiometric ratio according to the nominal chemical formula Ba3.5Sm1.5Fe0.75Nb9.25O30, procedures including presintering, second ball milling and the like are performed, and the X9R ceramic capacitor dielectric material Ba3.5Sm1.5Fe0.75Nb9.25O30 is finally prepared through a solid-phase reaction and a decarbonation process. The ceramic capacitor dielectric material with good temperature stability can be obtained with the method, the EIA (Electronic Industries Association) X9R standard can be met; and the method is simple and suitable for batch production, the cost is moderate, and energy conservation and emission reduction are realized.

Description

technical field [0001] The invention relates to an X9R type ceramic capacitor dielectric material and a preparation method thereof, belonging to the technical field of ceramic materials for electronic components. Background technique [0002] Ceramic capacitors are important basic devices of electronic information technology. With the rapid development of electronic devices, ceramic capacitors are required to maintain stable dielectric properties in a wider temperature range. According to the EIA (Electronic Industries Association) standard, the X9R type MLCC refers to the capacitance value at 25°C as the reference, and within the temperature range from -55°C to +200°C, the capacitance change rate (ΔC / C25) ≤ ±15%. In the fields of military industry, aerospace and exploration, there is a great demand for electronic components that can withstand high temperatures. At present, most ceramic capacitors use X7R ceramic formula, but the capacity and temperature characteristics of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 胡长征孙振朱其华方亮
Owner 苏州弘吴科技中介服务有限公司
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