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Synthesis method of high-purity AlSiC flaky powder

A flake powder and AlSiC technology, which is applied in the synthesis of high-purity AlSiC flake powder, can solve the problems of high raw material cost, impossibility of large-scale industrial application, and high price of AlSiC, so as to improve strength, The effect of high purity and strengthening structure

Inactive Publication Date: 2013-04-10
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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  • Synthesis method of high-purity AlSiC flaky powder
  • Synthesis method of high-purity AlSiC flaky powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1, preparation of aluminum silicon carbon flake powder

[0024] The selected formula is: Al 2 o 3 Fine powder (average particle size 0.01mm): quartz sand (average particle size 0.01mm): carbon black (average particle size 0.01mm): black SiC (average particle size 0.1mm) = 54:15:30:1 (mass ratio), weigh Measure the ingredients and dry mix them in a ball mill to obtain a mixture. Put the mixture into a graphite crucible, put the graphite crucible into an electric furnace, and heat at 1900°C in a protective atmosphere with a CO partial pressure of 0.5 and an Ar gas partial pressure of 0.5 (the total pressure of the protective gas is 1 atmosphere, and the flow rate is 1L / min). Keeping the temperature for 2 hours, after cooling, remove the impurity-enriched layer on the upper surface to obtain a flaky Al-SiC powder with a length and width of 50-200 μm and a thickness of 4-5 μm. Al in the obtained flake AlSiC powder 4 SiC 4 The content is 99.2%. The scanning ...

Embodiment 2

[0026] Embodiment 2, preparation of aluminum silicon carbon flake powder

[0027] The selected formula is: fused corundum (average particle size 0.5mm): quartz sand (average particle size 0.5mm): graphite (average particle size 0.1mm): green SiC (particle size about 0.5mm) = 55:13:28:4 (mass ratio ), weigh the ingredients, and dry stir evenly to obtain the mixture. Put the mixture into a graphite crucible, put the graphite crucible into an electric furnace, and heat at 2000°C in a protective atmosphere with a CO partial pressure of 0.60 and an Ar gas partial pressure of 0.40 (the total pressure of the protective gas is 1 atmosphere, and the flow rate is 1l / min). Insulate for 5 hours, after cooling, remove the impurity-enriched layer on the upper surface to obtain a flake-shaped aluminum-silicon carbon powder with a length and width of 50-200 μm and a thickness of 4-5 μm. 4 SiC 4 The content is 99.1%.

Embodiment 3

[0028] Embodiment 3, preparation aluminum silicon carbon flake powder

[0029] The selected formula is: sintered corundum (average particle size 0.8mm): quartz sand (average particle size 0.8mm): petroleum coke (average particle size 0.8mm): black SiC (average particle size 0.8mm) = 47:11:40:2 (mass ratio ), weigh the ingredients, and dry mix them in a ball mill to obtain a mixture. Put the mixture into a graphite crucible, put the graphite crucible into an electric furnace, and heat at 2200°C in a protective atmosphere with a partial pressure of CO of 0.9 and a partial pressure of Ar gas of 0.1 (the total pressure of the protective gas is 1 atmosphere, and the flow rate is 1l / min). Insulate for 5 hours, after cooling, remove the impurity-enriched layer on the upper surface to obtain a flake-shaped aluminum-silicon carbon powder with an average length and width of 180 μm and an average thickness of 5 μm. 4 SiC 4 The content is 99.1%.

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Abstract

The invention discloses a preparation method of an AlSiC flaky powder. The method comprises the following steps: 1) mixing weighed raw materials so as to obtain a mixture, wherein the raw materials comprise the following components by weight percent: 45-60% of Al2O3 raw material, 10%-20% of SiO2 raw material, 25-40% of carbon raw material and 14% of SiC raw material; and 2) heating the mixture for 2-5 hours at the temperature of 1900-2200 DEG C at the mixed atmosphere of CO and Ar, cooling, and then removing the impurity layer on the surface of the product so as to obtain the AlSiC flaky powder, wherein the total pressure of the mixed atmosphere is 1 atmosphere pressure. The method in invention is simple and practicable and is suitable for scale production, and the yield and purity of theobtained product are high; and the length and width sizes of the obtained AlSiC flaky powder are 50-200 mu m, and the thickness of the AlSiC flaky powder is 4-5 mu m. The flaky structure of AlSiC is beneficial to enhancement of a ceramic product structure and improvement of product strength, thermal shock resistance and chemical corrosion resistance.

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 flake 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 AlS...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/515C04B35/626
Inventor 赵建立汪长安黄勇白春丽白周义
Owner TSINGHUA UNIV
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