How to Increase the Upper Temperature Limit of Carbon Fiber Heater Elements?

Many manufacturers of grijaći elementi od karbonskih vlakana produce tubes with a maximum operating temperature of around 300 degrees Celsius. Above this temperature, the lifespan of the heating tubes significantly decreases. Moreover, the silicone layer of high-temperature resistant wires tends to powderize over time in high-temperature environments, gradually losing its insulating properties. Prolonged use can lead to electrical leaks in equipment, and inadequate protection measures can easily lead to safety accidents. So, how can we solve this problem?

First, let’s analyze the factors that limit the maximum operating temperature. We mainly analyze from the physical properties of the raw materials:

1. Kvarcni cijevi: Quartz tubes can be used for extended periods at temperatures up to 1100 degrees Celsius, so there will be no issues at 300 degrees Celsius.
2. Grijaća žica: Carbon fiber is used as the heating wire in carbon fiber heater elements, and it can maintain its physical and chemical properties up to 2700 degrees Celsius in a vacuum, so there is no issue with the heating wire.
3. Pure Molybdenum Electrodes: Molybdenum can maintain its physical and mechanical properties up to 2400 degrees Celsius, so the electrodes are not the problem.
4. High-Temperature Resistant Wires: The heat resistance grade of high-temperature wires is 350 degrees Celsius. Above this temperature, the wires will lose their insulating properties, thus determining the temperature resistance level of carbon fiber heater elements.

Second, let’s analyze the temperature limit issue from the operational condition of carbon fiber heater elements. Ten seconds after being powered on, the temperature at the heating area of the carbon fiber heater element can reach over 500 degrees Celsius. According to the principle of energy conservation, if the quartz heating tube is placed in an enclosed space, the temperature of the space will continue to rise until thermal equilibrium is reached.

But why is it often mentioned that the temperature limit for carbon fiber heater elements is 350 degrees Celsius? This is not because the quartz heating tubes cannot withstand higher temperatures, but because the wiring in most heating equipment is arranged inside ovens, and the highest temperature resistance of the wires is about 350 degrees Celsius, making the high-temperature wires the bottleneck material for increasing the operating temperature of carbon fiber heater elements.

From the above analysis, to solve the issue of the upper temperature limit of carbon fiber heater elements, it is necessary to address the temperature resistance of high-temperature wires. Should we increase the temperature rating, or should we change the wiring method?

Screw Connector Carbon Fiber Heater Elements A new method involves using screw connectors instead of wire welding, thus no longer worrying about silicone wires powdering and detachment at the wire welding joints. After extensive research and by adopting the connection methods of other heating tubes, a carbon fiber heater element with a screw connector has been developed. It uses M4 screws to replace wire welding on the quartz heating tube, allowing customers to retrofit using the traditional installation method of metal resistance wire heating tubes without needing to modify the circuit design, thus ensuring the insulation performance of the heating tube wires at high temperatures and preventing equipment leakage and malfunctions.

So, what is the upper temperature limit for carbon fiber heater elements? We hope to achieve over 1000 degrees Celsius, which could replace traditional silicon carbide heating rods. Silicon carbide heating rods require protective atmospheres of inert or reductive gases, have shorter lifespans, and higher costs. If carbon fiber heater elements can replace silicon carbide heating rods, it would open up significant opportunities in the market, offering a more cost-effective and durable solution.

For more information about our innovative heating solutions, visit naše web stranice ili nas kontaktirajte putem e-pošte na contact@globalquartztube.com. Global Quartz Tube is dedicated to providing high-quality and durable grijaći elementi od karbonskih vlakana that meet the needs of a diverse range of industrial applications.