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Synthesis method of high-purity silicon carbon block

An aluminum-silicon-carbon and block technology is applied in the field of ceramic materials, which can solve the problems of high raw material cost, high price of aluminum-silicon-carbon, and inability to large-scale industrial application, and achieve the effect of low production cost and high purity

Inactive Publication Date: 2013-03-13
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 silicon carbon block

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, synthetic aluminum silicon carbon block body

[0023] The selected formula is: sintered corundum (average particle size 50mm): quartz sand (average particle size 150mm): petroleum coke (average particle size 20mm): black SiC (average particle size 5mm)=50:16:30:4 (mass ratio), 4 A raw material is assembled into a layer of raw material group according to the formula ratio and the following order from bottom to top: Al 2 o 3 Raw Material-Carbon Raw Material-SiC Raw Material-SiO 2 Raw materials, the thickness of each raw material group is about 300mm, and then the raw material groups are stacked layer by layer until the hearth of the electric arc furnace is filled. Electric heating in the air for 8 hours, the heating temperature is about 3500 ℃. After power-off and cooling, the product is cleaned out from the furnace, and the outer impurity-enriched layer is peeled off to obtain a block-shaped aluminum-silicon-carbon product. After analysis, Al in the syn...

Embodiment 2

[0025] Embodiment 2, synthesizing aluminum-silicon-carbon block

[0026] The selected formula is: sintered corundum (average particle size 5mm): quartz sand (average particle size 5mm): coal coke (average particle size 2mm): green SiC (average particle size 2mm)=49:18:32:1 (mass ratio), 4 A raw material is assembled into a layer of raw material group according to the formula ratio and the following order from bottom to top: Al 2 o 3 Raw Material-Carbon Raw Material-SiC Raw Material-SiO 2 Raw materials, the thickness of each layer of raw material groups is about 200mm, and then the raw material groups are stacked layer by layer until the hearth of the electric arc furnace is full. Heating in the air for 5 hours, the heating temperature is about 3000°C. After power-off and cooling, the product is cleaned out from the furnace, and the outer impurity-enriched layer is peeled off to obtain a block-shaped aluminum-silicon-carbon product. After analysis, Al in the synthesized blo...

Embodiment 3

[0027] Embodiment 3, synthesizing aluminum-silicon-carbon block

[0028] The selected formula is: fused corundum (average particle size 20mm): quartz sand (average particle size 50mm): petroleum coke (average particle size 10mm): black SiC (average particle size 2mm)=53:10:36:1 (mass ratio), the The 4 kinds of raw materials are assembled into a layer of raw material groups according to the formula ratio and the following order from bottom to top: Al 2 o 3 Raw Material-Carbon Raw Material-SiC Raw Material-SiO 2 Raw materials, the thickness of each layer of raw material groups is about 250mm, and then the raw material groups are stacked layer by layer until the hearth of the electric arc furnace is full. Electric heating in air for 6 hours, the heating temperature is about 3200°C. After power-off and cooling, the product is cleaned out from the furnace, and the outer impurity-enriched layer is peeled off to obtain a block-shaped aluminum-silicon-carbon product. After analysi...

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Abstract

The invention discloses a synthesis method of a high-purity silicon carbon block. The method comprises the following steps: assembling weighed raw materials into a layer of raw material groups in a sequence from down to up, namely Al2O3 raw material, carbon raw material SiC raw material and SiO2 raw material, wherein based on the weight percent, the raw materials comprise 45%-60% of Al2O3 raw material, 10%-20% of SiO2 raw material, 30%-40% of carbon raw material and 1%-4% of SiC raw material, and overlapping the raw material groups layer by layer and then placing in a hearth of an arc furnace; then at the air atmosphere, smelting in the arc furnace, cooling a product obtained by smelting, and then removing the impurity layer on the surface of the product so as to obtain the silicon carbon slice block, wherein the smelting temperature is 3000-3500 DEG C, and the smelting time is 5-8 hours. The method in the invention is simple and practicable and is suitable for scale production, the production cost is low, and the yield and purity of the obtained product are high.

Description

technical field [0001] The invention belongs to the field of ceramic materials, and in particular relates to a method for synthesizing a high-purity aluminum-silicon-carbon block. 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 AlSiC ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/515C04B35/622C04B35/653
Inventor 赵建立汪长安黄勇白春丽白周义
Owner TSINGHUA UNIV
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