ED Type Silicon Carbide Heating Elements | SiC Heater Rods for High Temperature Furnaces

Introduction

ZYLAB Silicon Carbide (SiC) Heating Elements are high-efficiency electric heaters designed for use in laboratory and industrial high-temperature furnaces. Operating at temperatures up to 1600°C (2912°F), these elements are known for their high power output, uniform heating, and self-supporting structure.

They are available in a wide range of standard sizes and geometries — including U Type, ED Type, DB Type, H Type, W Type, Gun Type, SC Type, and SCR Type heating elements — and can also be custom-designed to meet the specific requirements of your process or equipment.

The ED type SiC heating element consists of three sections: a central hot zone (heating section) and two cold ends. The cold ends are impregnated with metallic silicon to lower their electrical resistance and operate at lower temperatures, improving energy efficiency. Electrical connections are made using aluminum braid straps attached to low-resistance contact coatings on the terminals.

1. Laboratory High-Temperature Furnaces

• Used in research institutions and testing labs for material heat treatment, sintering, and thermal analysis.

• Suitable for box furnaces, tube furnaces, and custom thermal chambers.

2. Ceramics and Glass Sintering

• Firing and sintering of technical ceramics, advanced glass materials, and glaze formulations.

• Consistent high-temperature performance supports precise densification.

3. Metallurgical Heat Treatment

• Annealing, tempering, and hardening of metal parts and alloy samples.

• Suitable for controlled atmosphere operations (air or inert gas).

4. Powder Metallurgy and Additive Manufacturing

• Debinding and sintering of metal and ceramic powders.

• Used in post-processing of 3D printed components.

5. Electronics and Semiconductor Processing

• Thermal aging, burn-in testing, and reliability testing for electronic devices and components.

• Stable temperature control ensures repeatable process results.

Features & Benefits

• Maximum Operating Temperature up to 1500°C
• Excellent Thermal Shock Resistance — Withstands rapid heating and cooling
• High Chemical Stability — Resistant to oxidation and corrosion
• Automatic Temperature Regulation — Follows thermal curve during use
• Accurate and Uniform Heating — Ideal for processes requiring thermal precision
• Easy Installation & Maintenance — Convenient electrical connection design
• Custom Sizes Available — Tailored to your specific furnace and process

Installation of Silicon Carbide Heating Elements

• Prepare spare parts.
• Open the top covers and remove the foams out of the furnace.
• Pick out the heating element and block which marked the same number, remove the stickers and put them into the mounting hole, until touch the bottom of the furnace chamber.
• Lift the heating element up one centimeter and fixed with a fixture.
• Connect the heating elements in series with the connecting pieces and fix them with the clamps.Keep a distance between the clamps to avoid short circuit.
• Connect the heating elements in series to the power supply.
• Fasten the fixtures when the temperature reaches 800 degree Celsius.
• Install the upper covers and chimney to complete the installation of the furnace.

Click to watch the silicon carbide heating element installation video!

Use of Silicon Carbide Heating Elements

• The length of the heating section of the silicon carbide rod should equal the width of the furnace chamber. If the heating section extends into the furnace wall, it may cause damage to the wall.
• The length of the cold end of the silicon carbide rod should equal the thickness of the furnace wall plus the length that extends outside the wall. Typically, the cold end extends 50 to 150 mm to facilitate cooling and connection to fixtures.
• The internal diameter of the furnace accommodating the silicon carbide rod should be 1.4 to 1.6 times the outer diameter of the cold end. If the furnace opening is too small or the filling material inside is too tight, it can restrict the free expansion of the silicon carbide rod at high temperatures, leading to breakage. During installation, the silicon carbide rod should be able to rotate freely 360 degrees.
• The distance between the silicon carbide rod and the heated object or furnace wall should be greater than or equal to three times the diameter of the heating section. The center distance between silicon carbide rods should be no less than four times the diameter of the heating section.
• The cold end of the silicon carbide rod should be connected to the main circuit using aluminum braids or aluminum foil.
• Before use, silicon carbide rods should be matched for resistance. Connect rods with the same or similar resistance values together.
• When using silicon carbide rods, it is important to choose reasonable surface load density and operating temperature.
• When replacing silicon carbide rods, choose rods with resistance values close to those of the rods currently in operation. If necessary, replace all rods in the furnace to enhance their lifespan. If the removed rods have suitable resistance values, they can be reused later in the operation of the electric furnace.