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Graded metal-ceramic composite and preparation method thereof

A technology of cermet and composite materials, applied in the field of gradient cermet composite materials and its preparation, can solve the problems of poor thermal conductivity, uneven heating, high thermal conductivity, etc., and achieve the effect of excellent film quality and avoiding sealing phenomenon

Inactive Publication Date: 2014-09-17
EVERDISPLAY OPTRONICS (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, metal crucibles are usually made of Ti, Cu, and Al. Due to the excellent thermal conductivity of metals, it is easy to cause uneven heating of organic materials in the crucible, and the phenomenon of bursting and overflowing of evaporation materials occurs; alumina and quartz crucibles are thermally conductive. Poor performance, prone to the phenomenon of organic materials gathering at the mouth of the crucible; while silicon nitride and graphite crucibles are expensive and difficult to clean
It can be seen that the thermal conductivity of the crucible made of the current crucible material is too large or too small, and when the evaporation material is placed in it, there is a problem of uneven heating from bottom to top based on the distance from the heat source

Method used

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Examples

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preparation example Construction

[0026] The present invention also provides a preparation method of the above-mentioned gradient metal-ceramic composite material, which includes: layering and mixing metal powder, ceramic particles and binder, so that the ceramic particles are evenly dispersed in the metal powder, and the volume percentage of ceramic particles in each layer is It presents a continuous gradient change; the layers are stacked and pressed to form a shaped body with ceramic particles distributed in a gradient along the longitudinal thickness direction; the shaped body is sintered after degreasing to make a gradient metal-ceramic composite material. According to the preparation method of the present invention, metal powder and ceramic powder are doped with a small amount of binder to form a thin layer, and the volume percentage of ceramic powder in different thin layers is different and changes in a gradient, and these thin layers with different composition contents They are pressed together, then d...

Embodiment 1

[0032] First, according to the ratio of 10%, 15%, 20%...60% by volume, boron nitride ceramic powder is added to aluminum powder, and then 0.8% of binder is added to form 11 layers of boron nitride with different contents. Composite powder thin layers, the thickness of each thin layer is 2mm, the thin layers are sequentially laminated into one body with a pressure of 76MPa, after degreasing treatment to remove the binder, hot isostatic pressing sintering is carried out at 580°C for 1.5 hours. It is determined that the thermal conductivity of the obtained gradient metal-ceramic composite material shows a gradient change in the range of 70-130W / mk.

Embodiment 2

[0034]First, according to the proportion of 10%, 15%, 20% ... 60% by volume, pyrolytic boron nitride ceramic powder is added to aluminum powder, and then 1.5% of binder is added to form 11 layers of pyrolytic boron nitride. Composite powder thin layers with different boron content, the thickness of each thin layer is 2mm, the thin layers are stacked sequentially into one body with a pressure of 80MPa, after the binder is removed by degreasing, hot isostatic pressing is carried out at 630°C Sinter for 2 hours. It is determined that the thermal conductivity of the obtained gradient metal-ceramic composite material shows a gradient change in the range of 85-149W / mk.

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Abstract

The invention provides a graded metal-ceramic composite containing a metal matrix and ceramic particles dispersed in the metal matrix, wherein the metal matrix is copper, aluminum or copper-aluminum alloy; the ceramic particles are boron nitride, pyrolyzed boron nitride, aluminum nitride or silicon carbide and are in graded distribution in the metal matrix along the longitudinal thickness direction, and the volume fraction is in continuous and gradient change between 10% and 60%. The invention also provides a preparation method of the graded metal-ceramic composite. The graded metal-ceramic composite provided by the invention is proper in heat conductivity and capable of realizing gradient change, and the heat conductivity of the prepared evaporation crucible is correspondingly in graded distribution from the bottom to an opening, so that an organic evaporation material placed in the crucible can be uniformly heated, and an organic film with favorable quality is formed by virtue of evaporation.

Description

technical field [0001] The invention relates to a composite material and a preparation method thereof, in particular to a gradient metal-ceramic composite material and a preparation method thereof. Background technique [0002] The vacuum evaporation method is a method in which the material to be formed into a film is vaporized or sublimated by heating in an evaporation crucible in a vacuum environment, so that it is condensed and deposited on the surface of the substrate material to form a thin film. At present, the vacuum evaporation method has been widely used in the manufacture of various thin film devices, especially organic thin film devices. For example, in the manufacturing process of organic small molecule devices such as OLED devices, the vacuum evaporation method is often used to prepare the organic functional layers of the device. , the preparation process is generally in high vacuum (10 -3 Pa~10 -7 Pa) environment, the organic material placed in the crucible i...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C32/00
CPCC04B35/583C04B35/64C04B2235/3826C04B2235/3865C04B2235/5436
Inventor 张其国黄成沛黄初旺
Owner EVERDISPLAY OPTRONICS (SHANGHAI) CO LTD
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