Method for preparing high-heat-conductivity aluminum nitride ceramics by self-propagating powder

A self-propagating technology of aluminum nitride ceramics, applied in the field of preparation of aluminum nitride ceramic substrates, can solve the problems of high equipment requirements and high production costs

Active Publication Date: 2015-06-24
FUJIAN HUAQING ELECTRONICS MATERIAL TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

This long-term sintering process requires high equipment, and at the same time, the production cost is huge

Method used

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  • Method for preparing high-heat-conductivity aluminum nitride ceramics by self-propagating powder
  • Method for preparing high-heat-conductivity aluminum nitride ceramics by self-propagating powder
  • Method for preparing high-heat-conductivity aluminum nitride ceramics by self-propagating powder

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specific Embodiment approach

[0019] A method for preparing high thermal conductivity aluminum nitride ceramics from self-propagating powder, comprising the following preparation steps:

[0020] (1) Pre-heat treatment of self-propagating powder: heat-treat commercial self-propagating aluminum nitride powder in a high-temperature graphite furnace, the heat treatment temperature is 1600-1700°C, the treatment time is 1-4h, and the protective atmosphere is nitrogen;

[0021] (2) Preparation of casting slurry: 100 parts by weight of self-propagating aluminum nitride powder treated in step (1), 3-8 parts by weight of Y 2 o 3 and 0.5-1 parts by weight of TiO 2 (Sintering additive), ball milling and mixing with 23 parts by weight of solvent (absolute ethanol / butanol mixture), 2.0 parts by weight of dispersant (fish oil) for 24 hours, and then mixed with 20 parts by weight of solvent (absolute ethanol / butanol mixture ), 10 parts by weight of binder (polyvinyl butyral), and 5 parts by weight of plasticizer (dibuty...

Embodiment 1～13

[0025] 1000g of self-propagating high-temperature synthetic aluminum nitride powders were respectively heat-treated in a high-temperature graphite furnace. The heat-treatment conditions are shown in Table 1, and the treated powders were used for later use.

[0026] Table 1

[0027]

[0028] Respectively weigh 1000g of the above heat-treated powder, and then combine with Y 2 o 3 and TiO 2 (The amount of the two is shown in Table 2), 230g of absolute ethanol / butanol, 20g of fish oil and ball milled for 24 hours, then added 200g of absolute ethanol / butanol, 100g of polyvinyl butyral (PVB), 50g of ortho Dibutyl phthalate was mixed together for 12 hours, and the slurry was subjected to vacuum defoaming treatment for 5 hours to obtain a casting slurry with a viscosity near 20000 cps. Wherein the ratio of absolute ethanol / butanol is 1:2.

[0029] Table 2

[0030]

[0031]The slurry was passed through a tape casting machine to obtain a tape casting green body with a thickne...

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Abstract

The invention relates to the field of preparation of aluminum nitride ceramics and provides a method for preparing high-heat-conductivity aluminum nitride ceramics by self-propagating powder. Heat conductivity of the aluminum nitride ceramics obtained by the method is larger than 160 W/m by K, heat transfer performance is high, and high-power LED packaging requirements can be met. The method includes of thermal pre-treatment of self-propagating powder and preparation of tape casting slurry, tape casting green-ware and ceramic substrates. The thermal-pretreatment of the self-propagating powder includes treating the self-propagating aluminum nitride powder in a graphite oven at the high temperature, the preparation of tape casting slurry includes preparing sintering additives which are Y2O3 and TiO2 composition, the Y2O3 additive amount is 3-8wt%, the TiO2 additive amount is 0.5-1wt%, and the preparation of ceramic substrates adopts high-temperature pressureless sintering.

Description

technical field [0001] The invention relates to the field of preparation of aluminum nitride ceramic substrates, in particular to a method for preparing high thermal conductivity aluminum nitride ceramics by using self-propagating powder. Background technique [0002] With the development of high-power LEDs, higher requirements are placed on the insulating substrate materials used. The traditionally used alumina ceramic substrates are increasingly difficult to meet the high-power and miniaturized packaging requirements due to their low thermal conductivity. Aluminum nitride ceramic materials have unique advantages in high-power LED packaging due to their high thermal conductivity. However, since the raw material powders currently used to prepare aluminum nitride ceramic substrates are usually imported aluminum nitride powders, the direct nitriding method (Toyo Aluminum) and the carbothermal reduction method (Tokuyama Soda) are the main methods, and Domestic aluminum nitride...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/582C04B35/622
Inventor 杨大胜施纯锡
Owner FUJIAN HUAQING ELECTRONICS MATERIAL TECH
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