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Preparation technique for silicon carbide heating element

A technology of heating element and preparation process, which is applied in the field of preparation of ceramic materials for the heating part of silicon carbide heating element, and can solve the problems of high equipment requirements, complicated process, high temperature, etc.

Inactive Publication Date: 2005-03-16
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In U.S. patents (4336216) and (4668452), submicron β-SiC raw materials are used, the cost is high, the primary sintering and secondary sintering temperatures are high, and the secondary sintering is carried out under high nitrogen pressure, the process is complicated, and the equipment conditions are required high

Method used

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  • Preparation technique for silicon carbide heating element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1: Mix silicon carbide powder with particle size number 30 mesh mass fraction of 0.35, 80 mesh mass fraction of 0.25, 0.2 petroleum coke powder, 0.10 graphite powder, and 0.10 silicon powder on a mixer or wheel mill for 0.5 hours ;

[0035] Step 2: Add an alcohol-soluble phenolic resin with a mass fraction of 0.12, an organic plasticizer and ethanol 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;

[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: The raw material is continuously extruded on a screw extruder or a pisto...

Embodiment 2

[0047] Step 1: Mix silicon carbide powder with a particle size of 60 mesh and a mass fraction of 0.65, 0.2 petroleum coke powder, 0.05 activated carbon powder, and 0.10 silicon powder on a mixer or a wheel mill for 0.5 hours;

[0048] Step 2: Add an alcohol-soluble phenolic resin with a mass fraction of 0.12, an organic plasticizer and ethanol to the above-mentioned homogeneously mixed powder, and roll on a wheel mill for 1 hour;

[0049] Step 3: Break the rolling material into blocks and place it at room temperature;

[0050] Step 4: Crushing and crushing the dried raw materials, passing through an 8-mesh sieve to granulate, and set aside;

[0051] 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;

[0052] Step 6: Seal the mixed and milled raw materials and place them for 6 hours;

[0053] Step 7: The raw material is continuously extruded on a screw extruder or a piston extruder to form...

Embodiment 3

[0060] Step 1: Mix silicon carbide powder with particle size number 120 mesh mass fraction of 0.60 and 180 mesh mass fraction of 0.25, petroleum coke powder of 0.10, and activated carbon powder of 0.05 in a mixer or wheel mill for 0.5 hours;

[0061] Step 2: Add an alcohol-soluble phenolic resin with a mass fraction of 0.10, an organic plasticizer and ethanol to the above-mentioned homogeneously mixed powder, and roll on a wheel mill for 1 hour;

[0062] Step 3: Break the compacted material into blocks, and place it at room temperature for drying;

[0063] Step 4: Crushing and crushing the dried raw materials, passing through a 40-mesh sieve to granulate, and set aside;

[0064] 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;

[0065] Step 6: Seal the mixed and milled raw materials and place them for 6 hours;

[0066] Step 7: The raw material is continuously extruded on a screw extrude...

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Abstract

The invention relates to the preparation technique for silicon carbide heating ceramic material, wherein the material is prepared from silicon carbide, petroleum coke, graphite, activated charcoal, silicon powder by the mass fraction of 0.3-0.9, 0.05-0.5, 0-0.2, 0-0.1, 0-0.3 through conventional processes which comprises 12 steps and specific technological conditions, the obtained principal crystalline phase is alpha-SiC with porosity.

Description

technical field [0001] The invention belongs to the technical field of silicon carbide ceramic materials, and relates to a preparation process of a ceramic material for a heating part 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 heating part is the actual working part. The heating part is required to have a certain resistance, and the resistance is uniform, so as to achieve the reasonable distribution of current and voltage and the uniformity of heating. At the same time, it has good oxidation resistance and strength, improves the life of the heating element and reduces the energy. consume [0003] At present, the process of industrially manufacturing the heating part of silicon carbide heating elements mainly adopts the Acheson resistance...

Claims

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Application Information

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IPC IPC(8): C04B35/563C04B35/622C04B35/64
Inventor 高积强金志浩乔冠军王红洁杨建锋
Owner XI AN JIAOTONG UNIV
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