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Hotbar SiC Heating Elements

Hotbar silicon carbide heating elements are manufactured from recrystallized high purity alpha silicon carbide rod or tubular form. Optimized structure of SiC particles make it have special characteristics as applied in industry and lab, which have the best service life particularly in oxidation and/or corrosive atmospheres. Hotbar SiC elements may be mounted either vertically or horizontally at the Max. operation temperature 1600℃ without any special supports, the elements will not deform. This provides a flexible furnace design for maximum interior design.

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Introduction

Hotbar silicon carbide heating elements are manufactured from recrystallized high purity alpha silicon carbide rod or tubular form. Optimized structure of SiC particles make it have special characteristics as applied in industry and lab, which have the best service life particularly in oxidation and/or corrosive atmospheres. Hotbar SiC elements may be mounted either vertically or horizontally at the Max. operation temperature 1600℃ without any special supports, the elements will not deform. This provides a flexible furnace design for maximum interior design. Another feature is that elements can be replaced when the furnace is in continuous operation, thus avoiding a shutdown. Its high loading capacity is suitable for low-volume and high power conditions. Therefore, it is widely used in various high temperature electric furnaces and other electric heating devices, such as industrial applications involving magnetic, ceramics, powder metallurgy, glass, metallurgy and machinery.

We utilize modern production processes and technology. Hot zone and cold ends are connected by using specialized SiC binding materials, and then we treat the welded section with a second siliconized application at high temperature, which improves the strength of the weld greatly and can provide customers with high quality heating elements. Meanwhile, the resistivity of hot zone is much higher than cold ends, as a result, Hotbar elements have excellent hot and cold resistance rate and feature energy-efficiency and energy savings. The commercial name of our SiC heating elements is Risesun Hotbar. Hotbar can be operated at up to 1600℃ in clean dry air but the service temperature will be limited by gases such as nitrogen, ammonia, hydrogen. Other possibilities exist as well.

Item

unit

Type

 

 

DH & DL

HD

Density

g/cm3

2.5

2.65

Porosity

%

23

18

Rupture strength

MPa (25℃)

50

60

Thermal Conductivity

W/m·℃ (1000℃)

14~19

14~19

Specific heat

kj/kg·℃ (25~1300℃)

1.0

1.0

Coefficient of thermal expansion

(1000℃) × 10-6

4.5

4.5

 

Chemical properties of elements

The elements begin to  oxidize when heated up to 800¡æ in air, a SiO2 protective  film  forms on the  surface of the hot zone when the temperature reaches 1000~1300℃; Cristobalite will be crystallized at 1300℃; The protective  film  gets to a certain thickness at 1500℃ which  makes the elements oxidation speed very slowly. If  heating exceeds  (1000℃, the protective  film will be destroyed and oxidation will become more rapid and will make the element fail prematurely.

Even though the element oxidizes very slowly during operation, it also causes the resistivity of the element to change as it ages.  To retard the aging speed, for certain atmospheric conditions, we can provide different protection coats which will improve the service life of the elements.

Inquiry

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