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Method for preparing SiC heating element having long service life

A heating element, long-life technology, applied in the direction of heating element materials, etc., can solve problems such as short life, and achieve the effect of improving service life and small local resistance changes

Inactive Publication Date: 2012-01-04
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of short service life of traditional silicon carbon rods, the present invention provides a preparation method of long-life SiC heating elements

Method used

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  • Method for preparing SiC heating element having long service life
  • Method for preparing SiC heating element having long service life
  • Method for preparing SiC heating element having long service life

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Embodiment Construction

[0015] see figure 2 The process flow chart for the preparation of the SiC heating element of the present invention, the heating part 1 and the cold end part 2 both involve the steps of batching, mixing, molding, drying, firing and inspection. The specific examples of the heating part are shown in Table 1. The specific embodiment of the cold end is shown in Table 2.

[0016] Table 1 Formula composition and process parameters of the heating part

[0017]

[0018] Formulation composition and process parameters of the cold end of table 2

[0019]

[0020] exist figure 2 In the process shown, the inspection 1 process is to detect the thermal state of the resistance value (resistivity) of the sintered heating part 1 or the cold end part 2, and the detection temperature is 1100°C.

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Abstract

The invention discloses a method for preparing a SiC (silicon carbide) heating element having long service life. The method comprises the following steps: proportioning the following components by mass percentage: 75% to 90% of SiC, 1% to 5% of Al2O3, 1% to 5% of ZrO2, 1% to 3% SiO2, 4% to 10% of Si and 1% to 5% of C; preparing the components into a hollow pipe by using the extrusion molding process; drying at 80 to 300 DEG C; sintering at 1,450 to 1,650 DEG C in the presence of protective nitrogen, cutting into a heating part, and testing the resistance of the heating part for later use; proportioning the following components by mass percentage: 70% to 90% of SiC, 1% to 5% of Ni, 1% to 5% of Mo, 1% to 5% of Ti, 1% to 5% of TiC, 5% to 10% of Si and 1% to 5% of C; sintering the components by using the same process of forming and sintering as the heating part, cutting into a cold-side part, testing the resistance of the cold-side part for later use; and welding the cold-side parts at two ends of the heating part at the local-welding temperature of 1,500 to 1,600 DEG C, to complete the preparation of the entire heating element.

Description

technical field [0001] The invention relates to a method for preparing a heating element, in particular to a method for preparing a SiC heating element. Background technique [0002] SiC (silicon carbide) heating elements, also known as silicon carbide rods, usually consist of two parts: a heating part and a cold end part ( figure 1 ). The heating part is generally sintered by SiC recrystallization, and the sintering temperature is usually around 2200°C. The porosity is 15-20%, and the strength is 75-100Mpa; the resistivity is relatively large, generally 15-20 times that of the cold end. At present, the cold end material is mainly processed by reaction sintering and infiltration. The porosity is less than 1%, dense, the strength is as high as 250MPa, and the resistivity is small. The optimum operating temperature of silicon carbide rods is generally 800°C to 1350°C. The heating part is at a high temperature, and the surface of SiC reacts with oxygen to produce an oxidatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B3/14C04B35/565C04B35/622C04B37/02
Inventor 金志浩李红伟杨万利乔冠军金海云
Owner XI AN JIAOTONG UNIV
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