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Magnesium silicon nitride powder and preparation method thereof, ceramic material and thermally conductive substrate

A technology of magnesium silicon nitride and ceramic materials, applied in the field of thermal conductive materials, can solve the problems of high impurity content, low sintering activity and low powder quality, and achieve the effects of high sintering activity, low oxygen content and regular shape

Active Publication Date: 2021-07-09
HENGYANG KAIXIN SPECIAL MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the synthesis process of the self-propagating high-temperature synthesis method is difficult to control, the reaction product is easy to agglomerate, and the powder quality is low; the reaction process of the direct nitriding method is strongly exothermic, and there are many side reactions, resulting in low purity of the obtained silicon magnesium nitride product. , more impurity content, low sintering activity

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  • Magnesium silicon nitride powder and preparation method thereof, ceramic material and thermally conductive substrate

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preparation example Construction

[0035] One embodiment of the present invention provides a method for preparing magnesium silicon nitride powder, which includes the following steps S100-S200.

[0036] Step S100, mixing magnesium silicate and carbon source to obtain a mixture; carbon source includes carbohydrate organic carbon and low-carbon alcohol polymer; and based on the total mass of magnesium silicate and carbon source, the mass of low-carbon alcohol polymer The percentage is 1wt%-5wt%.

[0037] Step S200, placing the mixture obtained in step S100 under a nitrogen atmosphere for a reduction reaction to obtain magnesium silicon nitride powder.

[0038] In the above preparation method, magnesium silicate and a specific carbon source are used for reduction reaction, and the carbon source is mainly sugar organic carbon, supplemented by a low-carbon alcohol polymer with a mass percentage of 1wt% to 5wt%, which has a certain high The low-carbon alcohol polymer with polymerization and bonding properties is int...

Embodiment 1

[0110] 1) get the magnesium silicate that accounts for 50wt% purity of material gross mass and be 99%, particle size 0.5 micron, 47wt% purity be the sucrose of 99% and the polyvinyl alcohol of 3wt%, then be 1 by the mass ratio of material and water: 1 Add distilled water, mix by ball milling, dry in vacuum at 70°C, and pass through a 200-mesh sieve to obtain the mixture.

[0111] 2) Put the mixture obtained in step 1) in a silicon nitride crucible and place it in a reaction furnace. After vacuuming, pour 1MPa nitrogen gas into it, raise the temperature to 800°C at a rate of 5°C / min, and then increase the temperature to 3°C. The heating rate per minute was increased to 1300°C, and the reduction reaction was carried out for 3 hours after the heat preservation. After the reaction, it was calcined in the air atmosphere of 600°C for 5 hours for carbon removal treatment, and the magnesium silicon nitride powder was obtained.

[0112] 3) Provide the following raw materials: silicon n...

Embodiment 2

[0119] 1) get the magnesium silicate that accounts for 50wt% of material gross mass with the purity of 99%, particle size 0.5 micron, 49wt% purity be the sucrose of 99% and the polyvinyl alcohol of 1wt%, then be 1 by the mass ratio of material and water: 1 Add distilled water, mix by ball milling, dry in vacuum at 70°C, and pass through a 200-mesh sieve to obtain the mixture.

[0120] All the other steps are the same as in Example 1.

[0121] The purity and the whisker structure of the magnesium silicon nitride powder obtained in embodiment 2 are tested, and the results show that: the whisker length of the magnesium silicon nitride powder obtained in step 2) is 30 μm, and the diameter is 0.5 μm, and the impurity content is 0.8wt%, the oxygen content is 0.3wt%.

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Abstract

The invention relates to a silicon magnesium nitride powder and a preparation method thereof, a ceramic material and a thermally conductive substrate; in the preparation method of the silicon magnesium nitride powder of the present invention, magnesium silicate and a carbon source are mixed to obtain a mixture; then the mixture The reduction reaction is carried out under a nitrogen atmosphere to obtain magnesium silicon nitride powder; wherein, the carbon source includes sugar organic carbon and a low-carbon alcohol polymer; based on the total mass of magnesium silicate and carbon source, the low-carbon alcohol polymer The mass percentage of the compound is 1wt%~5wt%. In the preparation method, the carbon source is mainly sugar organic carbon, supplemented by a low-carbon alcohol polymer with a mass percentage of 1wt% to 5wt%; Lead wires are interspersed during the process to make the reaction materials react uniformly, so that the obtained magnesium silicon nitride powder has whiskers with a specific aspect ratio, regular shape, low oxygen content, and high sintering activity.

Description

technical field [0001] The invention relates to the technical field of heat-conducting materials, in particular to a silicon-magnesium nitride powder and a preparation method thereof, a ceramic material and a heat-conducting substrate. Background technique [0002] With the rapid development of electronic technology, the application of VLSI has put forward higher requirements for electronic packaging technology. Designing a reasonable and efficient circuit cooling system is a key part of whether large-scale integrated circuits can be realized. Among them, the substrate material has the functions of support, insulation and heat dissipation, and is the top priority of the entire electronic packaging system. In order to improve the heat dissipation capability of the substrate, on the one hand, the substrate material itself is required to have high thermal conductivity, and on the other hand, the substrate material is required to have excellent strength, so as to reduce the thic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/593C04B35/622C04B35/63
CPCC04B35/593C04B35/622C04B35/6303C04B2235/3445C04B2235/5276C04B2235/5436C04B2235/602C04B2235/656C04B2235/6562C04B2235/6567C04B2235/6582C04B2235/96C04B2235/9607
Inventor 曾小锋朱福林肖亮曾庆党李勇全
Owner HENGYANG KAIXIN SPECIAL MATERIAL TECH CO LTD