Catégories: Carbure de silicium , Électrification , Éléments chauffants , Produits de fournaise
Publié 23 juin 2026

When Nikola Tesla helped make alternating current practical for large-scale power distribution, he changed the way the world uses electricity. More than a century later, electricity continues to power industries, processes, and technologies that would have seemed unimaginable at the time.

One of its most important industrial applications remains surprisingly simple: generating heat.

Whether it is a heat-treatment furnace, a melting application, or a thermal-processing line, the process begins with a heating element that converts electrical energy into heat. Yet while the principle is straightforward, achieving reliable, efficient, and long-lasting operation requires much more than selecting the right element.CaptionOle Stadum, Senior Field Sales Engineer, Kanthal.

Ole Stadum, Senior Field Sales Engineer at Kanthal, with experience spanning electric heating technologies, furnace operation, and control systems, explains the factors that influence heating element performance.

"The heating element is only one part of the system," states Stadum. "Load configuration, furnace control dynamics, thermocouples, and power control modes all influence how the element performs and how long it will last."

Optimization starts before element selection

Before examining specific heating element technologies, it is worth examining the factors that directly impact heating element performance, reliability, and service life.

  • Load configuration

The way heating elements are connected affects how power is distributed throughout the system.

Series, parallel, star, and delta configurations each influence voltage, current, and total power differently. Selecting the appropriate load configuration helps ensure that the heating system delivers the required power while maintaining suitable operating conditions for the heating elements.

  • Furnace control dynamics

A heating element is only one part of a much larger thermal system.

Furnace design, thermal mass, heat losses, and process requirements all influence how temperatures change throughout the furnace. The same heating element can behave very differently depending on the environment in which it operates.

Understanding these dynamics is essential when configuring the control regime and selecting the most suitable heating solution.

  • Thermocouples

Every control decision starts with temperature measurement.

If a thermocouple is poorly positioned, slow to respond, or affected by drift, the controller may be reacting to temperatures that do not accurately represent actual furnace conditions. The result can be unnecessary temperature fluctuations and additional stress on heating elements.

Accurate temperature feedback is therefore fundamental to stable operation.

  • Power control modes

Heating elements respond directly to the way electrical power is delivered.

Burst firing in fixed or variable time bases, phase-angle control, and current or voltage limitation each influence element behavior differently. Selecting the correct power control mode for the heating technology and application helps create more stable operating conditions and can contribute significantly to element life.

"When customers experience short element life, the first reaction is often to look at the element itself," says Stadum. "But many times the explanation can be found elsewhere in the system."

Optimizing Kanthal’s metallic heating elements

Kanthal's metallic portfolio includes ready-made heating elements manufactured from Kanthal® iron-chromium-aluminum (FeCrAl) alloys and Nikrothal® nickel-chromium (NiCr) alloys. Designed for element temperatures from 50°C to 1,425°C (120°F to 2,600°F), these elements are used across a wide range of industrial heating applications and furnace configurations.

When optimizing metallic heating element life, focus on:

  • Minimizing unnecessary temperature fluctuations
  • Using short-cycle burst firing where appropriate
  • Operating within recommended surface loading limits
  • Ensuring accurate thermocouple placement and temperature feedback
  • Reviewing controller tuning and operating practices if premature aging occurs

Metallic heating elements rely on a protective oxide layer for long-term performance. Repeated heating and cooling cycles can create mechanical stresses within both the element and the oxide layer, gradually affecting service life.

"We should ask and investigate the control regime for the furnace," says Stadum. "That often provides more answers than immediately redesigning the element."

Optimizing Kanthal® Super heating elements

The Kanthal® Super molybdenum disilicide (MoSi₂) portfolio consists of heating elements designed for some of the most demanding high-temperature industrial applications. With element temperatures reaching up to 1,850°C (3,360°F), they are commonly used in advanced ceramic, electronics, and high-temperature furnace applications where conventional heating technologies reach their limits.

To get the best performance from Kanthal® Super heating elements, pay particular attention to:

  • Current limitation during startup
  • Appropriate phase-angle power control
  • Controller tuning
  • Avoiding prolonged operation at low element temperatures
  • Resistance-based temperature monitoring where applicable

Unlike metallic heating elements, Kanthal® Super elements have significantly lower resistance at room temperature than at operating temperature. This makes startup conditions especially important.

Proper current limitation helps protect the heating system while allowing the elements to reach operating temperature safely and efficiently.

Optimizing Globar® silicon carbide heating elements

Globar® silicon carbide (SiC) heating elements offer exceptional electric heating capabilities for element temperatures up to 1,625°C (2,950°F). Available in a wide range of standard sizes and geometries, as well as customized designs, they are used in applications that require high power, even heat distribution, and reliable operation at elevated temperatures.

When optimizing Globar® heating elements, consider:

  • Designing for future resistance increases, not only initial operating conditions
  • Providing adequate voltage reserve
  • Selecting suitable transformer and power supply configurations
  • Using voltage-based control strategies
  • Monitoring aging behavior and system performance over time

One of the defining characteristics of silicon carbide heating elements is that their resistance gradually increases throughout their operating life. This behavior is a normal part of the technology and should be considered from the earliest stages of system design.

Systems designed with this in mind are better equipped to maintain stable performance over the long term.

Bringing it all together

There is no universal formula for optimizing heating elements.

A silicon carbide element behaves differently from a molybdenum disilicide element. A high-temperature furnace presents different challenges than a drying application. What remains constant is the need to match the right heating technology with the right operating conditions.

That's where optimization delivers its greatest value. Not by changing what the heating element can do, but by enabling it to deliver what it was designed to.