Method for preparing yttrium-doped nano aluminum nitride powder

A nano-aluminum nitride and yttrium-doped technology, which is applied in the field of material science, can solve problems such as the difficulty in achieving uniform mixing of additives and matrix materials, reducing the thermal conductivity of aluminum nitride ceramics, and increasing the content of sintering additives. Adverse effects, high density, effect of promoting dense sintering

Active Publication Date: 2012-06-20
CHINA JILIANG UNIV
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Problems solved by technology

[0005] From the current domestic and foreign research on densely sintered aluminum nitride ceramics, adding sintering aids is one of the simplest and most effective methods, but there are also some unavoidable defects, such as the currently used sintering aids and Aluminum nitride powders are all micron-sized powders, it is difficult to achieve uniform mixing of additives and matrix materials, resulting in an

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  • Method for preparing yttrium-doped nano aluminum nitride powder
  • Method for preparing yttrium-doped nano aluminum nitride powder
  • Method for preparing yttrium-doped nano aluminum nitride powder

Examples

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Example Embodiment

[0024] Example 1:

[0025] Weigh 1.0 mol aluminum nitrate dissolved in 2.0 L of deionized water to form a 0.5 mol / L aluminum source solution, and weigh 0.0076 mol of yttrium nitrate dissolved in 0.0152 L of deionized water to form a 0.5 mol / L yttrium source solution. The solution and the yttrium source solution are mixed to form an aluminum-yttrium mixed solution. Weigh 1.0 mol citric acid and dissolve it in 5.0 mol ethylene glycol, mix and stir evenly, and add it to the aluminum-yttrium mixed solution. Weigh 0.83 mol of glucose and dissolve it in 1.66 L of deionized water to form a 0.5 mol / L carbon source solution, mix it evenly and add it to the above-mentioned aluminum-yttrium mixed solution. Stir the above mixed solution evenly, then heat to 130 ℃ for 2 h, continue to heat to 200 ℃ for 2 h, after cooling, a fluffy brown-black powder is obtained. The above fluffy brown-black powder is calcined in a nitrogen atmosphere at 1000 ℃ for 1 h to obtain a uniformly mixed carbotherma...

Example Embodiment

[0026] Example 2:

[0027] Weigh 1.0 mol of aluminum acetate dissolved in 1.0 L of absolute ethanol to form a 1.0 mol / L aluminum source solution, and weigh 0.023 mol of yttrium nitrate dissolved in 0.023 L of absolute ethanol to form a 1.0 mol / L yttrium source solution. The aluminum source solution and the yttrium source solution are mixed to form an aluminum-yttrium mixed solution. Weigh 2.0 mol of citric acid and dissolve it in 8.0 mol of ethylene glycol, mix and stir evenly, and add to the above-mentioned aluminum-yttrium mixed solution. Weigh 0.8 mol of sucrose and dissolve it in 0.8 L of absolute ethanol to form a 1.0 mol / L carbon source solution, mix it evenly and add it to the above-mentioned aluminum-yttrium mixed solution. Stir the above mixed solution uniformly, then heat to 125 ℃ for 3 h, continue to heat to 180 ℃ for 4 h, after cooling, a fluffy brown-black powder is obtained. The above fluffy brown-black powder was calcined in a nitrogen atmosphere at 900 ℃ for 1 h...

Example Embodiment

[0028] Example 3:

[0029] Weigh 1.0 mol aluminum isopropoxide and dissolve it in 0.5 L acetone to form a 2.0 mol / L aluminum source solution, and weigh 0.03 mol yttrium acetate to dissolve in 0.03 L acetone to form a 1.0 mol / L yttrium source solution. The solution and the yttrium source solution are mixed to form an aluminum-yttrium mixed solution. Weigh 1.5 mol of citric acid and dissolve it in 8.0 mol of ethylene glycol, mix and stir evenly, and add to the above-mentioned aluminum-yttrium mixed solution. Weigh 0.3 mol glucose and 0.3 mol sucrose to dissolve in 1.2 L deionized water to form a 0.5 mol / L carbon source solution, mix them evenly and add them to the aluminum-yttrium mixed solution. Stir the above mixed solution evenly, then heat to 125 ℃ for 2 h, continue to heat to 220 ℃ for 2 h, after cooling, a fluffy brown-black powder is obtained. The above fluffy brown-black powder was calcined in a nitrogen atmosphere at 800 ℃ for 1 h to obtain a uniformly mixed carbothermic...

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Abstract

The invention discloses a method for preparing yttrium-doped nano aluminum nitride powder. The method comprises the following steps of: dissolving an aluminum source, a carbon source and an yttrium source into a solvent, and then mixing the solvent and an ethylene glycol solution of citric acid; and preserving the heat of the mixed solution for 2 to 4 hours at the temperature of between 125 and 135 DEG C, continuously heating the mixed solution to the temperature of between 180 and 220 DEG C, preserving the heat for 2 to 4 hours, calcining the obtained substance at the temperature of between 800 and 1,200 DEG C in vacuum or nitrogen, cooling, grinding, performing carbothermic reduction reaction at the temperature of between 1,450 and 1,550 DEG C, and thus obtaining the yttrium-doped nano aluminum nitride powder. By using the complexing effect of the citric acid and the steric hindrance effect of the ethylene glycol, the aluminum and yttrium ions are uniformly distributed in the carbonsource, and the yttrium-doped nano aluminum nitride powder with small particle diameter and uniform components is finally obtained; and the yttrium-doped nano aluminum nitride powder can effectively reduce the sintering temperature of aluminum nitride ceramic and improve the heat conductivity of the aluminum nitride ceramic, and has an important application prospect in electronic substrates and power devices.

Description

technical field [0001] The invention relates to a method for preparing nano-aluminum nitride powder by adding yttrium element as an auxiliary agent, and belongs to the field of material science and technology. Background technique [0002] Aluminum nitride ceramics (AlN) have the characteristics of high thermal conductivity, linear expansion coefficient matching silicon, low dielectric constant, excellent electrical insulation performance, corrosion resistance, environmental protection and non-toxicity, etc., and have replaced alumina and oxide Beryllium has become the material of choice for VLSI substrates, and has been widely used in high-tech fields such as modern electronics and microelectronics. However, since aluminum nitride is a covalent compound with a small self-diffusion coefficient, it is difficult to sinter densely. Even if it is sintered at a high temperature above 1900 ℃, it cannot reach 90% of the theoretical density. At the same time, the thermal conductivit...

Claims

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Application Information

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IPC IPC(8): C01B21/072C04B35/582C04B35/626B82Y30/00B82Y40/00
Inventor 王焕平杨清华徐时清邓德刚赵士龙华有杰
Owner CHINA JILIANG UNIV
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