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

A technology of polyimide dielectric and barium strontium titanate, which is applied in the field of composite material manufacturing, can solve the problems such as the dielectric adjustability of polymer-based barium strontium titanate composite materials, and achieve excellent chemical stability, The effect of reducing the dielectric constant and smoothing the surface without cracks

CN101070427AInactive Publication Date: 2007-11-14XI AN JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2007-11-14
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

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...