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Method for producing cold end part of silicon carbide heating element

A heating element and manufacturing method technology, applied in the field of silicon carbide ceramic materials, can solve the problems of high residual carbon content, serious environmental pollution, high material consumption and energy consumption

Inactive Publication Date: 2005-01-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second method has been phased out in recent years, while the third method is technically very difficult
The main crystal phase of the cold end prepared by this process is α-SiC and free silicon, the free silicon content is difficult to control, the residual carbon content is high, and the material consumption and energy consumption are high, and the environmental pollution is serious.

Method used

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  • Method for producing cold end part of silicon carbide heating element
  • Method for producing cold end part of silicon carbide heating element
  • Method for producing cold end part of silicon carbide heating element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1: Put silicon carbide powder with a particle size of 30 mesh, a mass fraction of 0.35, a particle size of 80 mesh, and a mass fraction of 0.25, petroleum coke powder with a mass fraction of 0.20, graphite powder of 0.10, and silicon powder of 0.10 in a mixer Upmixing for 0.5 hours;

[0035] Step 2: Add alcohol-soluble phenolic resin, organic plasticizer and ethanol with a mass fraction of 0.12 to the above-mentioned homogeneously mixed powder, and roll on a wheel mill for 1 hour;

[0036] Step 3: Break the rolling material into blocks, and place it at room temperature to dry;

[0037] Step 4: Crushing and crushing the dried raw materials, passing through an 8-mesh sieve to granulate, and set aside;

[0038] Step 5: Add the raw materials to be used into water-soluble phenolic resin with a mass fraction of 0.15, and mix and grind for 30 minutes;

[0039] Step 6: Seal the mixed and milled raw materials and place them for 6 hours;

[0040] Step 7: Extrude a φ25mm s...

Embodiment 2

[0046] Step 1: Mix silicon carbide powder with a particle size of 60 mesh and a mass fraction of 0.65, petroleum coke powder with a mass fraction of 0.20, graphite powder with a mass fraction of 0.05, and silicon powder with a mass fraction of 0.10 on a mixer for 0.5 hours;

[0047] Step 2: Add alcohol-soluble phenolic resin, organic plasticizer and ethanol with a mass fraction of 0.12 to the above-mentioned homogeneously mixed powder, and roll on a wheel mill for 1 hour;

[0048] Step 3: Break the rolling material into blocks, and place it at room temperature to dry;

[0049] Step 4: Crushing and crushing the dried raw materials, passing through an 8-mesh sieve to granulate, and set aside;

[0050] Step 5: Add the raw materials to be used into water-soluble phenolic resin with a mass fraction of 0.15, mix and grind for 30 minutes and then seal;

[0051] Step 6: Seal the mixed and milled raw materials and place them for 12 hours;

[0052] Step 7: Extrude a φ25mm shaped green b...

Embodiment 3

[0058] Step 1: Mix silicon carbide powder with a particle size of 120 mesh, a mass fraction of 0.60, a particle size of 180 mesh, and a mass fraction of 0.25, petroleum coke powder with a mass fraction of 0.1, and activated carbon powder of 0.05 on a mixer for 0.5 hours;

[0059] Step 2: Add alcohol-soluble phenolic resin, organic plasticizer and ethanol with a mass fraction of 0.1 to the above-mentioned homogeneously mixed powder, and roll on a wheel mill for 1 hour;

[0060] Step 3: Break the rolling material into blocks, and place it at room temperature to dry;

[0061] Step 4: Crushing and crushing the dried raw materials, passing through a 40-mesh sieve to granulate, and set aside;

[0062] Step 5: Add the raw materials to be used into water-soluble phenolic resin with a mass fraction of 0.08, and mix and grind for 30 minutes;

[0063] Step 6: Seal the mixed and milled raw materials and place them for 24 hours;

[0064] Step 7: Extrude a φ25mm shaped green body on a scr...

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Abstract

The invention relates to a preparation process for silicon carbide heating element which comprises 12 steps including, mixing silicon carbide, pulverized petroleum coke, graphite powder, activated charcoal powder, silica flour by the weight parts of 0.3-0.9, 0.05-0.5, 0-0.2, 0-0.1 and 0-0.3, charging alcohol soluble, water-soluble formaldehyde-phenol resin and organic plasticizing agent and ethanol, loading the formed blank into vacuum atmosphere sintering furnace for agglomeration at 1450-1850 deg. C, thus obtaining the heating portion for the heating element having a finite porosity and alpha-SiC as the principal crystalline phase.

Description

technical field [0001] The invention belongs to the technical field of silicon carbide ceramic materials, and relates to a method for manufacturing a ceramic material at a cold end of a silicon carbide heating element. Background technique [0002] Silicon carbide heating elements are heating elements of various electric furnaces and industrial furnaces. The end of the heating element is called the cold end, and the middle part is called the heating part. The cold end is used to connect with the wire, and requires low resistance to avoid the increase of contact resistance with the wire caused by heating and oxidation. Reducing the resistance ratio of the cold end / heating part is conducive to reducing the useless power consumption of the heating element and achieving the effect of energy saving. [0003] In the prior art before the present invention, the method for reducing cold end resistance mainly contains: 1. under the same and close situation of cold end and heating par...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/622C04B35/632
Inventor 金志浩高积强乔冠军王红洁杨建锋
Owner XI AN JIAOTONG UNIV
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