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Method for preparing strontium-barium titanate/polymide dielectric adjustable composite material thick film

A polyimide dielectric and barium strontium titanate technology, which is applied in the field of composite material manufacturing, can solve the problem that the dielectric tunability of polymer-based barium strontium titanate composite materials is not found, and achieves excellent chemical stability, Simple process and excellent electrical properties

Inactive Publication Date: 2009-07-22
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Through document search, have not yet found to have the document and patent similar to the present invention, some documents relevant to the present invention retrieved, mainly improve strontium barium titanate by adding low-loss materials such as magnesium oxide in barium strontium titanate material. Comprehensive dielectric properties of materials to improve their adaptability in device applications, did not find any report on the dielectric tunability of polymer-based barium strontium titanate composites

Method used

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  • Method for preparing strontium-barium titanate/polymide dielectric adjustable composite material thick film
  • Method for preparing strontium-barium titanate/polymide dielectric adjustable composite material thick film
  • Method for preparing strontium-barium titanate/polymide dielectric adjustable composite material thick film

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Experimental program
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Effect test

Embodiment 1

[0060] 1. Select ZKPI-305IID ordinary polyimide coating glue produced by Beijing Bomi Technology Co., Ltd. as the polyimide precursor.

[0061] 2. The chemical composition is prepared by conventional solid-state reaction method as Ba 0.6 Sr 0.4 TiO 3 Barium strontium titanate dielectric tunable ceramics. According to XRD detection, barium strontium titanate has a pure cubic perovskite structure without the formation of a second phase.

[0062] 3. Crushing by means of ordinary ball milling, the ball milling speed is 150 rpm, and the ball milling is continued for 4 hours. The central particle size of the prepared barium strontium titanate powder is 0.6um.

[0063] 4. Take 100g of crushed barium strontium titanate powder, dry at 110°C for 24 hours, then add 2-5g of acrylic acid solution, and ultrasonically treat it in 100ml of absolute ethanol for 1 hour, so that the surface of the ceramic powder is treated with acrylic acid.

[0064] 5. Mix 20g of the polyimide precursor and...

Embodiment 2

[0068] 1. Select ZKPI-305IID ordinary polyimide coating glue produced by Beijing Bomi Technology Co., Ltd. as the polyimide precursor.

[0069] 2. The chemical composition is prepared by conventional solid-state reaction method as Ba 0.6 Sr 0.4 TiO 3 Barium strontium titanate dielectric tunable ceramics. According to XRD detection, barium strontium titanate has a pure cubic perovskite structure without the formation of a second phase.

[0070] 3. Crushing by means of ordinary ball milling, the ball milling speed is 150 rpm, and the ball milling is continued for 4 hours. The central particle size of the prepared barium strontium titanate powder is 0.6um.

[0071] 4. Take 100g of crushed barium strontium titanate powder, dry at 110°C for 24 hours, then add 2-5g of acrylic acid solution, and ultrasonically treat it in 100ml of absolute ethanol for 1 hour, so that the surface of the ceramic powder is treated with acrylic acid.

[0072] 5. Mix 20g of the polyimide precursor and...

Embodiment 3

[0076] 1. Select ZKPI-305IID ordinary polyimide coating glue produced by Beijing Bomi Technology Co., Ltd. as the polyimide precursor.

[0077] 2. The chemical composition is prepared by conventional solid-state reaction method as Ba 0.6 Sr 0.4 TiO 3 Barium strontium titanate dielectric tunable ceramics. According to XRD detection, barium strontium titanate has a pure cubic perovskite structure without the formation of a second phase.

[0078] 3. Crushing by high-energy ball milling, ball milling for 4 hours, the central particle size of the prepared barium strontium titanate powder is 0.1um.

[0079] 4. Take 100g of crushed barium strontium titanate powder, dry at 110°C for 24 hours, then add 2-5g of acrylic acid solution, and ultrasonically treat it in 100ml of absolute ethanol for 1 hour, so that the surface of the ceramic powder is treated with acrylic acid.

[0080] 5. Mix 20 g of the polyimide precursor and 20 g of the surface-pretreated barium strontium titanate pow...

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Abstract

The invention discloses the preparation methods of a barium strontium titanate / polyimide dielectric with the materials of adjustable thick composite, uses polyimide as a precursor; Selecting the barium strontium titanate powder dielectric ceramics (Ba1-xSrx) TiO3 as dielectric adjustable phase, polyimide precursors and the surface treatment of barium strontium titanate dielectric ceramic powder mixed in proportion, by using a high-energy or ordinary ball milling way to make them adequately scattered and get mixed thick-film paste;Using conventional spin-coating process, dipping - carrying process or extension of thick slurry will be mixed in the pre-treatment of the coating material on the substrate, and then coating on the substrate material after the heat treatment process and follow-up process can be get Barium strontium titanate / polyimide dielectric adjustable thick composite materials. This invention need a low processing temperature (=< 350 degree C), the minimum curing temperature is less than 160 degree C.

Description

technical field [0001] The invention belongs to the technical scope of composite material manufacturing, and in particular relates to a method for preparing a thick film of strontium barium titanate / polyimide dielectric adjustable composite material. Background technique [0002] As phased array radar is widely used in various types of detection and tracking systems, as a key component of phased array radar - phase shifter has become the focus of research. Compared with ferrite and PIN diodes widely used at present, barium strontium titanate (Ba 1-x Sr x TiO 3 , referred to as BST) as a representative of the ferroelectric material phase shifter, because of its low cost, excellent performance and simple process, it has attracted more and more attention, and has become a hot spot in the research of phase shifter materials. Among many candidate materials for ferroelectric phase shifters, barium strontium titanate is known for its high dielectric constant (ε r >2000, 1MHz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L79/08C08K9/04C09D179/08C08K3/24
Inventor 汪宏向锋张明辉杨海波李可铖姚熹
Owner XI AN JIAOTONG UNIV
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