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Bird nest-like structure aluminum oxide as well as preparation method and application thereof

A technology of alumina and ultra-fine alumina, which is applied in chemical instruments and methods, structural parts, aluminum compounds, etc., can solve the problems of reducing the heat transfer efficiency of materials, affecting the thermal conductivity of composite materials, and increasing the quality of materials, so as to improve The effect of mechanical properties, light weight and good thermal conductivity

Pending Publication Date: 2022-06-03
HUANGHUAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This will lead to the following problems: when the addition amount is high, it means that more filler-matrix interfaces are formed in the composite material, and interfacial thermal resistance will be generated at the interface, and high interfacial thermal resistance will seriously reduce the heat transfer efficiency of the material, thus Affects the overall thermal conductivity of the composite material; in addition, the introduction of too much filler loses the advantage of light weight of the polymer material itself, resulting in an increase in the quality of the prepared material, which brings inconvenience to the practical application of the material

Method used

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  • Bird nest-like structure aluminum oxide as well as preparation method and application thereof
  • Bird nest-like structure aluminum oxide as well as preparation method and application thereof
  • Bird nest-like structure aluminum oxide as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Example 1: Discussion on the Morphology of Raw Materials and the Solid Content of Aluminum Oxide Dispersion

[0034] In order to explore the influence of different shapes of alumina raw materials and the solid content of the prepared alumina dispersion on the preparation of bird's nest-like alumina, the present invention uses spherical ultrafine alumina and commercially available non-spherical alumina as raw materials to prepare alumina-like Alumina with bird's nest structure, see Example 1-1 to Example 1-10 for specific experiments.

Embodiment 1-1

[0036]A method for preparing aluminum oxide with a bird's nest structure, the specific steps are:

[0037] (1) Add spherical ultrafine alumina with a particle size of 30 to 150nm into water, stir and disperse evenly at a stirring speed of 500rpm to obtain a dispersion liquid. The spherical ultrafine alumina is prepared by plasma technology, spherical The phase of ultrafine alumina is a mixed phase of unstable phase θ-alumina and γ-alumina;

[0038] (2) The dispersion liquid obtained in step (1) is subjected to 10min static settlement treatment, after the static sedimentation finishes, remove the sediment, collect the upper layer suspension, and obtain the alumina dispersion liquid; the solid content of the alumina dispersion liquid is 20wt% ;

[0039] (3) The alumina dispersion obtained in step (2) is sprayed and granulated by a spray granulation dryer to obtain particle agglomerates. The specific process parameters of spray granulation are: the inlet temperature is 270°C, th...

Embodiment 1-2

[0041] The content of Example 1-2 is basically the same as that of Example 1-1, except that the solid content of the alumina dispersion prepared in step (2) is 30 wt%.

[0042] The scanning electron micrograph of the class bird's nest structure aluminum oxide that the present embodiment prepares is as follows figure 1 shown. Depend on figure 1 It can be seen that the morphology of the bird's nest-like structure alumina prepared in this example is a hollow sphere, the particle size of the hollow sphere is 20-70 μm, and there is a large hole sunken inward on the hollow sphere, and the pore size of the large hole is 3-10 μm , the surface of the hollow sphere is covered with small holes, and the diameter of the small holes is 30-200nm.

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Abstract

The invention relates to the field of alumina powder production, and discloses a nest-like structure alumina, the nest-like structure alumina is a hollow sphere structure, the hollow sphere is provided with an inwardly recessed large hole, and the surface of the hollow sphere is a network structure fully distributed with small holes. The preparation method of the aluminum oxide with the bird nest-like structure comprises the following steps: 1) adding spherical superfine aluminum oxide into water, and uniformly dispersing to obtain dispersion liquid; 2) carrying out standing settlement treatment on the dispersion liquid, and after standing settlement is finished, collecting an upper-layer suspension to obtain an aluminum oxide dispersion liquid; and (3) carrying out spray granulation on the aluminum oxide dispersion liquid obtained in the step (2) to obtain a particle aggregate, and sintering the particle aggregate at 1180-1250 DEG C to obtain the aluminum oxide with the bird nest-like structure. According to the aluminum oxide filler with the bird nest-like network structure, the continuous network structure provides a continuous transmission path for heat transmission, and interface thermal resistance caused by adding of the filler is reduced.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a bird's nest-like structure alumina and its preparation method and application. Background technique [0002] Polymer materials such as epoxy resin, phenolic resin, silica gel and other materials are often used as packaging materials for electronic components because of their good insulation properties and easy processing properties. However, these materials have poor heat dissipation capabilities, typically 0.2Wm -1 K -1 left and right, seriously affecting the heat dissipation efficiency of electronic components. In order to improve the thermal conductivity of polymer materials, a common method is to add fillers with higher thermal conductivity to the polymer matrix to prepare polymer matrix composites with high thermal conductivity. There are three types of commonly used fillers: (1) metal fillers, such as copper, silver, and aluminum; (2) carbon materials...

Claims

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Application Information

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IPC IPC(8): C01F7/025C08K7/24C08L61/06H01M50/431
CPCC01F7/025C08K7/24H01M50/431C08K2201/005C01P2004/34C01P2004/61C01P2006/16C01P2004/03C08L61/06Y02E60/10
Inventor 白柳杨王红兵杨招徐凯张勇欧阳博成刘文富
Owner HUANGHUAI UNIV
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