Cordierite microcrystal powder and preparation method thereof, aluminum oxide ceramic substrate and preparation method thereof

A technology of alumina ceramics and micro-alumina, applied in the direction of aluminum silicate, silicate, etc., can solve the problems of inability to promote the development of alumina plate crystals in the substrate, the mechanical properties of the substrate are not promoted, and the density is low. Achieve the effect of reducing dielectric constant, short holding time, sintering temperature and sintering time

Active Publication Date: 2021-07-27
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, commercial cordierite powder is relatively inert, and under sintering conditions, it is difficult to fuse with sintering aid powder to produce a glass phase, which cannot promote the development of alumina plate-shaped crystals in the substrate, and has no effect on improving the mechanical properties of the substrate. Cordierite is relatively inert and added in a large amount, resulting in lower density and lower strength of the corresponding substrate after sintering

Method used

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  • Cordierite microcrystal powder and preparation method thereof, aluminum oxide ceramic substrate and preparation method thereof
  • Cordierite microcrystal powder and preparation method thereof, aluminum oxide ceramic substrate and preparation method thereof
  • Cordierite microcrystal powder and preparation method thereof, aluminum oxide ceramic substrate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A low-temperature sintered ultra-thin alumina ceramic substrate with adjustable dielectric constant, low dielectric loss and thermal expansion coefficient, and high strength, and a preparation method thereof, comprising the following steps:

[0050] (1) Raw material preparation and drying: After drying the used powder at 80°C for 24 hours, weigh 14 g of micron magnesium oxide (μm-MgO), micron silicon oxide (μm-SiO 2 )51g, micron alumina (μm-Al 2 o 3 ) 910g, CaO powder 20g, ZnO powder 5g.

[0051] (2) Pre-synthesis of cordierite microcrystalline powder: 14 g of μm-MgO, μm-SiO 2 51g and μm-Al 2 o 3 Add 35g into the ball mill tank, use water as the medium, corundum balls as the abrasive, the ball milling time is 30h, and the ball mill speed is 400r·min -1 , the slurry was dried at 90°C for 48h, and then in a box furnace at 4°C·mim -1 Raise to 1050°C for 4 hours, then cool in the furnace to obtain cordierite microcrystalline powder;

[0052] (3) Slurry preparation:...

Embodiment 2

[0057] A low-temperature sintered ultra-thin alumina ceramic substrate with adjustable dielectric constant, low dielectric loss and thermal expansion coefficient, and high strength, and a preparation method thereof, comprising the following steps:

[0058] (1) Raw material preparation and drying: After drying the used powder at 80°C for 24 hours, weigh 11.2g of μm-MgO, μm-SiO 2 40.8g, μm-Al 2 o 3 898g, CaO powder 40g, ZnO powder 10g.

[0059] (2) Pre-synthesis of cordierite microcrystalline powder: 11.2g of μm-MgO, μm-SiO 2 40.8g and μm-Al 2 o 3 Add 28g into the ball mill tank, use water as the medium, corundum balls as the abrasive, the ball milling time is 30h, and the ball mill speed is 400rpm min -1 , the slurry was dried at 90°C for 48h, and then in a box furnace at 4°C·mim -1 Raise it to 1100°C for 2 hours, and then cool it in the furnace to obtain cordierite microcrystalline powder;

[0060] (3) Slurry preparation: the obtained cordierite microcrystal powder,...

Embodiment 3

[0065] A low-temperature sintered ultra-thin alumina ceramic substrate with adjustable dielectric constant, low dielectric loss and thermal expansion coefficient, and high strength, and a preparation method thereof, comprising the following steps:

[0066] (1) Raw material preparation and drying: After drying the used powder at 80°C for 24 hours, weigh 7g of μm-MgO and μm-SiO 2 25.5g, μm-Al 2 o 3 892.5g, CaO powder 60g, ZnO powder 15g.

[0067] (2) Pre-synthesis of cordierite microcrystalline powder: 7g of μm-MgO, μm-SiO 2 25.5g and μm-Al 2 o 3 Add 17.5g into the ball mill tank, use water as the medium, corundum balls as the abrasive, the ball milling time is 30h, and the ball mill speed is 400rpm min -1 , the slurry was dried at 90°C for 48h, and then in a box furnace at 4°C·mim -1 Raise to 1150°C for 1.5 hours, then cool in the furnace to obtain cordierite microcrystalline powder;

[0068] (3) Slurry preparation: the obtained cordierite microcrystal powder, the rem...

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Abstract

The invention discloses cordierite microcrystal powder, an aluminum oxide ceramic substrate and a preparation method of the cordierite microcrystal powder. The preparation method comprises the following steps: slurry preparation: carrying out ball milling on micron aluminum oxide, a sintering aid, a dielectric loss regulator, the cordierite microcrystal powder and a forming aid to obtain slurry; preparing a green body: preparing a green body sheet by adopting a tape casting method; and glue discharging and sintering of the green body: sintering the green body after being glue discharging, wherein the temperature range of the sintering process ranges from 650 DEG C to the highest temperature, and the highest temperature ranges from 1000 DEG C to 1450 DEG C. The strength of the Al2O3 substrate is improved by utilizing the cordierite microcrystalline powder, and the thermal expansion coefficient and the dielectric constant of the Al2O3 substrate are reduced; the sintering temperature of the substrate is reduced by using a sintering aid; and the dielectric loss of the substrate under high frequency is reduced by using the dielectric loss regulator, so that the problems of high dielectric constant, high dielectric loss, high thermal expansion coefficient and poor thermal shock resistance of the Al2O3 substrate prepared in the prior art are effectively solved, the application range of the Al2O3 substrate is greatly widened, and the process is simple and stable.

Description

technical field [0001] The present invention relates to the technical field of alumina ceramics, in particular to cordierite microcrystalline powder and its preparation method, low-temperature sintered dielectric constant adjustable, low dielectric loss and thermal expansion coefficient, high-strength alumina ceramic substrate and its preparation method. Background technique [0002] The development of electronic technology has led to the rapid development of the insulating substrate industry as a carrier of circuit components. The high power, high density and high integration of electronic components put forward higher and higher requirements on the mechanical, thermal and electrical properties of substrate materials. Tape casting is an important molding process for thin ceramic materials, suitable for forming large, thin ceramic parts, especially easy to realize the molding of thin parts of complex shapes and sizes with stable green body quality, and such parts are almost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/26C04B35/626C04B35/10C04B35/638C04B35/64
CPCC01B33/26C04B35/62645C04B35/10C04B35/638C04B35/64C04B2235/3481C04B2235/6562C04B2235/6567C04B2235/3208C04B2235/3213C04B2235/3215C04B2235/3284C04B2235/3272C04B2235/3262C04B2235/3241C04B2235/96C04B2235/9607
Inventor 高朋召刘小磐郑航博李玉玲
Owner HUNAN UNIV
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