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Method for synthesizing high-purity aluminum silicon carbon superfine powder

A technology of ultrafine powder and aluminum silicon carbon, which is applied in the field of ceramic materials, can solve the problems of high raw material cost, impossibility of large-scale industrial application, high price of aluminum silicon carbon, etc., and achieves a simple and easy method, high efficiency and high purity. Effect

Inactive Publication Date: 2011-10-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the existing AlSiC synthesis methods all use metals or carbides as raw materials, and the high cost of raw materials results in high prices for the synthesized AlSiC, which cannot be used in large-scale industrial applications.

Method used

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  • Method for synthesizing high-purity aluminum silicon carbon superfine powder
  • Method for synthesizing high-purity aluminum silicon carbon superfine powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1, synthetic aluminum silicon carbon superfine powder

[0024] The selected formula is: carbon black (average particle size 2μm): Al 2 o 3 Fine powder (average particle size 3μm): Al 2 Si 2 o 5 (OH) 4 (Kaolin, average particle size 5 μm) = 27:45:28 (mass ratio), weigh the ingredients, add alcohol until the material is submerged, fully stir and mix on a vacuum heating rotary mixer, and dry the obtained mixture at 110°C . After drying, the mixture is put into a graphite crucible (the graphite crucible is not covered), the graphite crucible is placed in an electric furnace, heated at 1600°C in a vacuum atmosphere, and kept for 8 hours. After cooling, the impurity-enriched layer on the upper surface is removed, that is Obtain aluminum silicon carbon ultrafine powder with an average particle size of 2-5 μm, in which Al 4 SiC 4 The SiC content is 99.1%, and the SiC content is 0.3%.

Embodiment 2

[0025] Embodiment 2, synthetic aluminum silicon carbon superfine powder

[0026] The selected formula is: graphite (average particle size 5 μm): fused corundum (average particle size 5 μm): Al 2 Si 2 o 5 (OH) 4 (Kaolin, average particle size 3μm)=27:47:26 (mass ratio), weigh the ingredients, add alcohol until the material is submerged, fully stir and mix on a vacuum heating rotary mixer, and dry the obtained mixture at 110°C . After drying, the mixture is put into a graphite crucible (the graphite crucible is not covered), the graphite crucible is placed in an electric furnace, heated at 1600°C in a vacuum atmosphere, and kept for 8 hours. After cooling, the impurity-enriched layer on the upper surface is removed, that is Obtain aluminum silicon carbon ultrafine powder with an average particle size of 2-5 μm, in which Al 4 SiC 4 The content is 99.3%. The scanning electron microscope photo of the aluminum silicon carbon ultrafine powder is as follows: figure 2 shown. ...

Embodiment 3

[0028] Embodiment 3, synthetic aluminum silicon carbon superfine powder

[0029] The selected formula is: petroleum coke (average particle size 8 μm): sintered corundum (average particle size 5 μm): Al 2 Si 2 o 5 (OH) 4(Kaolin, average particle size 8 μm)=27:45:28, weigh the ingredients, add alcohol until the material is submerged, fully stir and mix on a vacuum heating rotary mixer, and dry the obtained mixture at 110°C. After drying, put the mixture into a graphite crucible (the graphite crucible is not covered), put the graphite crucible into an electric furnace, heat at 1700°C in a high-purity Ar atmosphere of 99.99% or more, keep it warm for 10 hours, and remove impurities on the upper surface after cooling Concentration layer, that is, to obtain aluminum silicon carbon ultrafine powder with an average particle size of 2-5 μm, in which Al 4 SiC 4 The SiC content is 99.1%, and the SiC content is 0.3%.

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Abstract

The invention discloses a method for preparing aluminum silicon carbon superfine powder. The method comprises the following steps of: 1) weighing the following raw materials in percentage by mass: 20 to 30 percent of kaolin, 40 to 50 percent of Al2O3 raw material and 20 to 30 percent of carbon raw material; stirring and mixing the raw materials to obtain a mixture; and 2) heating the mixture in vacuum or argon atmosphere at the temperature of between 1,600 and 1,700 DEG C, preserving the heat for 8 to 10 hours, cooling, and removing the impurity layer on the surface of the product to obtain the aluminum silicon carbon superfine powder. The average granularity of the prepared aluminum silicon carbon superfine powder is 2 to 5 microns, and the mass percentage content of Al4SiC4 is over 99 percent. The aluminum silicon carbon superfine powder can be directly used as a ceramic product matrix component; and a blocky aluminum silicon carbon material does not need to be synthesized and crushed into superfine powder, so that energy is saved. The method is simple, convenient, feasible and efficient; and the obtained product has high yield and purity.

Description

technical field [0001] The invention belongs to the field of ceramic materials, and in particular relates to a method for synthesizing high-purity aluminum-silicon-carbon ultrafine powder. Background technique [0002] Barczak first reported AlSiC (Al 4 SiC 4 )The presence. Aluminum silicon carbon has high thermal conductivity (80W·m -1 ·K -1 ), the high temperature bending strength is 50% higher than the room temperature bending strength, after high temperature oxidation, a dense high temperature resistant protective film (corundum and mullite) is formed on the surface to prevent further oxidation inside the aluminum silicon carbon, and it can still be used at 1800 °C in an oxidizing atmosphere Stable use, so it is suitable as a high-temperature ceramic material. The resistivity of AlSiC decreases with the increase of temperature (the resistivities at 100°C and 1000°C are 1.14×10 4 Ω·cm and 1.71×10 -1 Ω·cm), suitable for making high-temperature heating elements. And...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/626
Inventor 赵建立汪长安黄勇白春丽白周义
Owner TSINGHUA UNIV
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