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Composite ceramic and preparation method and application thereof

A technology of composite ceramics and composite ceramics, applied in the field of ceramic materials, can solve the problems of reducing thermal conductivity and mechanical strength of composite ceramics, deterioration of thermal conductivity and mechanical properties of composite ceramics, and reduction of sintering activity of composite ceramics

Active Publication Date: 2019-11-15
GUANGDONG UNIV OF TECH
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  • 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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  • Composite ceramic and preparation method and application thereof
  • Composite ceramic and preparation method and application thereof
  • Composite ceramic and preparation method and application thereof

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preparation example Construction

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

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

[0041] b) sequentially molding and sintering the composite ceramic powder to obtain a composite ceramic;

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

Embodiment 1

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

[0093] 1. Weigh 12.17 parts by mass of yttrium nitrate, dissolve it in absolute ethanol, and prepare Y 3+ Concentration is the ethanol solution (coating solution) of the yttrium nitrate of 0.15mol / L; And the ethanol solution (precipitant solution) of the ethylenediamine of preparation 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, ultrasonically disperse for 1 hour, and use a magnetic stirrer to mechanically disperse at a speed of 100r / min for 1 hour to prepare alumina Ceramic slurry; then while mechanically dispersing (magnetic stirrer, 100r / min) the alumina ceramic slurry, slowly drop the precipitant solution to it until the pH of the suspension system is 9.5, stop dropping the precipitant solution , after continuing to mechanically dis...

Embodiment 2

[0100] This embodiment provides the 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+ Concentration is the aqueous solution (coating solution) of magnesium nitrate of 0.01mol / L; And the ammonia solution (precipitant solution) that preparation pH value is 11; Ammonium acrylate was added to the coating solution and dispersed by ball milling for 4 hours to prepare alumina ceramic slurry; then, while mechanically dispersing (paddle mixer, 300r / min) the alumina ceramic slurry, slowly dropwise dropwise precipitate When the pH of the suspension system reaches 8.5, stop adding the precipitant solution dropwise, continue the mechanical dispersion for 6 hours, and then dry it in an oven at 120°C for 4 hours; then use a muffle furnace to calcinate at 350°C for 6 hours to obtain a coating Alumina ceramic composite powder.

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Abstract

The invention belongs to the technical field of ceramic materials and particularly relates to a composite ceramic and a preparation method and application thereof. The preparation method of the composite ceramic comprises the steps: coating the surface of first-phase ceramic powder and the surface of second-phase ceramic powder with a rare-earth metal oxide and / or an alkaline-earth metal oxide, then obtaining composite ceramic powder through mixing and granulation, conducting forming and sintering treatment on the composite ceramic powder to obtain the composite ceramic, wherein the rare-earthmetal oxide and / or the alkaline-earth metal oxide can inhibit direct contact and a high-temperature chemical reaction of the first-phase ceramic powder and the second-phase ceramic powder in the preparation process, the rare-earth metal oxide and / or the alkaline-earth metal oxide can be uniformly distributed in a composite ceramic matrix as a sintering aid, the microstructure uniformity of the composite ceramic can also be improved, and the mechanical strength of the composite ceramic can be effectively improved on the premise that the thermal conductivity of the composite ceramic is not reduced.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and in particular relates to a composite ceramic and its preparation method and application. 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 are put forward for integrated circuit substrates and heat dissipation devices. The substrates and heat dissipation devices are required to have high thermal conductivity, so as to Rapid heat dissipation and cooling of circuit chips; substrates and heat dissipation devices are required to have high strength to ensure service safety, reliability and long service life of electronic packaging components. Alumina ceramics are currently the most mature thermal management materials, accounting for 90% of the ceramic substrate market. However, the thermal conductivity of alumina ceramics is redu...

Claims

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Application Information

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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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