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A kind of composite ceramics and its preparation method and application

A technology of multiphase ceramics and composite ceramics, which is applied in the field of ceramic materials, can solve the problems of reducing the thermal conductivity and mechanical strength of multiphase ceramics, reducing the sintering activity of multiphase ceramics, and deteriorating the thermal conductivity and mechanical properties of composite ceramics. The uniformity of the microstructure and the effect of improving the mechanical strength

Active Publication Date: 2022-06-24
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high-temperature chemical reaction between the ceramic phase of high thermal conductivity ceramics and alumina will lead to the deterioration of thermal conductivity and mechanical properties of alumina matrix composite ceramics, for example: the addition of aluminum nitride to alumina will reduce the sintering activity of composite ceramics , and more importantly, under high temperature conditions, alumina and aluminum nitride are prone to react to form AlON, which will drastically reduce the thermal conductivity and mechanical strength of composite ceramics.

Method used

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  • A kind of composite ceramics and its preparation method and application
  • A kind of composite ceramics and its preparation method and application
  • A kind of composite ceramics and its preparation method and application

Examples

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preparation example Construction

[0039] A preparation method of multiphase ceramics, comprising the following steps:

[0040] a) mixing the film-coated first-phase ceramic composite powder with the film-coated second-phase ceramic composite powder, and granulating to obtain the composite ceramic powder;

[0041] b) The composite ceramic powder is sequentially formed and sintered to obtain a multiphase ceramic;

[0042] Wherein, the film-coated first-phase ceramic composite powder includes first-phase ceramic powder and rare earth metal oxide and / or alkaline earth metal oxide coated on the surface of the first-phase ceramic powder, and the film-coated second-phase ceramic composite powder The body includes a second-phase ceramic powder and rare earth metal oxide and / or alkaline earth metal oxide coated on the surface of the second-phase ceramic powder.

[0043] In the present invention, the surfaces of the first-phase ceramic powder and the second-phase ceramic powder are coated with rare earth metal oxide an...

Embodiment 1

[0092] The present embodiment provides the first preparation method of alumina-aluminum nitride composite ceramic, comprising the following steps:

[0093] 1. Weigh 12.17 parts by mass of yttrium nitrate, dissolve it in absolute ethanol, prepare Y 3+ The ethanolic solution (coating solution) of yttrium nitrate whose concentration is 0.15mol / L; and the ethanolic solution (precipitating agent solution) of ethylenediamine whose pH value is 13;

[0094] 2. Weigh 95 parts by mass of alumina ceramic powder and 0.5 parts by mass of PEG 2000, add them to the coating solution, and after ultrasonic dispersion for 1 hour, use a magnetic stirrer to mechanically disperse at 100 r / min for 1 hour to obtain alumina Ceramic slurry; then while mechanically dispersing (magnetic stirrer, 100r / min) alumina ceramic slurry, slowly add precipitant solution to it until the pH of the suspension system is 9.5, stop dripping precipitant solution , after continuing to mechanically disperse for 6 hours, d...

Embodiment 2

[0100] The present embodiment provides a second preparation method of alumina-aluminum nitride composite ceramics, comprising the following steps:

[0101] 1. Weigh 11.10 parts by mass of magnesium nitrate, dissolve it in deionized water, and prepare Mg 2+ An aqueous solution of magnesium nitrate with a concentration of 0.01 mol / L (film coating solution); and an ammonia solution (precipitating agent solution) with a pH value of 11 is prepared; 97 parts by mass of alumina ceramic powder and 3 parts by mass of polymethyl methacrylate are weighed Add ammonium acrylate to the coating solution, and ball mill for dispersion for 4 hours to prepare alumina ceramic slurry; then while mechanically dispersing (paddle mixer, 300r / min) the alumina ceramic slurry, slowly dropwise add the precipitate to it When the pH of the suspension system is 8.5, the dropwise addition of the precipitant solution is stopped, and after mechanical dispersion is continued for 6 hours, it is dried in an oven ...

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Abstract

The invention belongs to the technical field of ceramic materials, and in particular relates to a composite ceramic and its preparation method and application. The invention provides a preparation method of multi-phase ceramics. The surface of the first-phase ceramic powder and the second-phase ceramic powder is coated with rare earth metal oxide and / or alkaline earth metal oxide, and then mixed and granulated to obtain Composite ceramic powder, and then the composite ceramic powder is formed and sintered to obtain multi-phase ceramics. During the preparation process, rare earth metal oxides and / or alkaline earth metal oxides can inhibit the first-phase ceramic powder and the second-phase ceramic The direct contact and high temperature chemical reaction of the powder, and the rare earth metal oxide and / or alkaline earth metal oxide can be used as a sintering aid to distribute evenly in the composite ceramic matrix, and can also improve the microstructure uniformity of the composite ceramic, which can be used in Under the premise of not reducing the thermal conductivity of the composite ceramics, the mechanical strength of the composite ceramics can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a composite ceramic and a preparation method and application thereof. Background technique [0002] With the development and innovation of microelectronics technology, especially the development of high-frequency and high-power integrated circuits, higher and higher requirements have been placed on integrated circuit substrates and heat-dissipating components. The circuit chip conducts rapid heat dissipation and cooling; the substrate and heat dissipation components are required to have high strength to ensure the service safety, reliability and long service life of electronic packaging components. Alumina ceramics is currently the most mature thermal management material, accounting for 90% of the ceramic substrate market. However, the thermal conductivity of alumina ceramics is reduced, usually below 30W m -1 ·K -1 , which makes it difficult to apply it ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/622C04B35/628H05K7/20
CPCC04B35/10C04B35/622C04B35/6281C04B35/62815C04B35/62886H05K7/2039C04B2235/3225C04B2235/3227C04B2235/3206C04B2235/3229C04B2235/3865C04B2235/656C04B2235/6567C04B2235/96C04B2235/9607
Inventor 伍尚华聂光临黎业华
Owner GUANGDONG UNIV OF TECH
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