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Aluminium oxide ceramic substrate and preparation method for same

A technology for alumina ceramics and ceramic substrates, applied in the field of preparation of alumina ceramic substrates, can solve the problems of low breakdown strength, rough surface, low bulk density, etc., and achieve high breakdown strength, good surface smoothness, and bulk density. big effect

Active Publication Date: 2013-07-03
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of low volume density, rough surface and low breakdown strength of alumina ceramic substrates in the prior art, the present invention provides an alumina ceramic substrate and its preparation method

Method used

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preparation example Construction

[0014] The preparation method of the alumina ceramic substrate provided by the present invention comprises the steps of making a blank from the slurry mixed with the ceramic substrate powder and the first organic system, debinding, and sintering, and the ceramic substrate powder includes alumina powder and the first sintering auxiliary agent, the composition of the first sintering auxiliary agent is XCaO·YMgO·ZSiO 2 , 0.1≦X≦0.4, 0.1≦Y≦04, 0.5≦Z≦0.7, X+Y+Z=1, where X:Y:Z is the mass ratio, and the first sintering aid is in glass state.

[0015] The invention greatly reduces the sintering temperature of the alumina ceramics by self-made liquid-phase sintering aid; at the same time, the sintered alumina ceramics has a dense structure, good surface smoothness and high breakdown strength.

[0016] First, prepare the glassy powder of the first sintering aid, and weigh a certain amount of CaO, MgO and SiO according to the proportion 2 After mixing, the mixture is dispersed by ball ...

Embodiment 1

[0026] First prepare the first sintering aid XCaO·YMgO·ZSiO 2 , X=0.3, Y=0.2, Z=0.5 (X: Y: Z is the mass ratio), weigh CaO, MgO, SiO respectively according to the above ratio 2 After mixing, put it into a ball mill for rolling and dispersing for 4 hours, then melt it at 1500°C and directly quench it with water to obtain the glass shards of the first sintering aid, and then wet the glass shards for 24 hours. During the wet ball milling process, Water is used as the medium, and the first sintering aid with a particle size of about 2 μm is obtained after drying and sieving.

[0027] Afterwards, according to a certain ceramic substrate powder formula, weigh 95g of alumina powder, 4g of the first sintering aid, and 1g of the second sintering aid BaO.

[0028] Configure the first organic system, solvent: ethanol 25g, xylene 25g; dispersant: triolein 3g; binder: 7.5g polyvinyl butyral, commercially available models B30H and B60H with a mass ratio of 1:3 Add; plasticizer: 5g of a mi...

Embodiment 2

[0034] First prepare the first sintering aid XCaO·YMgO·ZSiO 2 , X=0.4, Y=0.1, Z=0.5 (X: Y: Z is the mass ratio), weigh CaO, MgO, SiO respectively according to the above ratio 2 After mixing, put it into a ball mill for rolling and dispersing for 4 hours, then melt it at 1450°C and directly quench it with water to obtain the first sintering aid glass fragments, then wet the glass fragments for 24 hours, and use ethanol during the wet ball milling process as a medium, dried and sieved to obtain the first sintering aid with a particle size of about 2 μm.

[0035] Afterwards, according to a certain ceramic substrate powder formula, weigh 96g of alumina powder, 3.5g of the first sintering aid, and 0.5g of the second sintering aid.

[0036] Configure the first organic system, solvent: 25g ethanol, 25g xylene; dispersant: 3g Span 80; binder: 7.5g polyvinyl butyral, add in the mass ratio of B30H and B60H with a mass ratio of 1:3; plasticize Agent: 5g of a mixture of dibutyl phthalat...

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Abstract

The invention provides a preparation method for an aluminium oxide ceramic substrate, and a ceramic substrate prepared by the method. The preparation method comprises the following steps that: a first sintering aid and a second sintering aid are added in a ceramic substrate powder; the first sintering aid is the glassy-state powder of XCaO.YMgO.ZSiO2, X is not less than 0.1 and not greater than 0.4, Y is not less than 0.1 and not greater than 0.4, Z is not less than 0.5 and not greater than 0.7, and the sum of X, Y and Z is 1, wherein X: Y: Z is a mass ratio; the second sintering aid is BaO; and the mode of stacking a ceramic substrate blank and a burning-isolating plate interlayer coated with nanometre aluminium oxide powder on the surface together, then placing the ceramic substrate blank and the burning-isolating plate interlayer in a sintering furnace, and sintering is adopted, wherein the prepared aluminium oxide ceramic substrate is high in volume density, good in surface smoothness and high in anti-breakdown strength.

Description

technical field [0001] The invention belongs to the field of ceramic preparation, in particular to a method for preparing a liquid-phase sintered alumina ceramic substrate. Background technique [0002] For the preparation of alumina ceramic substrates, most of the existing technologies use tape-casting technology to prepare green bodies, and then through debinding and high-temperature sintering. In the sintering process, solid-phase sintering is generally used. During solid-phase sintering, the temperature needs to reach the solid-phase reaction. The corresponding temperature can ensure the solid-phase reaction between the powders and make the powders sintered densely. The higher solid-phase sintering temperature (1650°C-1800°C) increases the preparation cost of the ceramic substrate and has high requirements for the sintering equipment. In order to obtain a lower sintering temperature, liquid phase sintering is also used in the prior art. The liquid phase sintering in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C04B35/63
Inventor 徐强任永鹏林信平王书敏
Owner BYD CO LTD
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