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Performance characteristics of silicon carbide furnace tubes

Release time:

2022-02-23

　　Silicon carbide furnace tubes boast excellent properties, including high strength, high hardness, excellent wear resistance, high-temperature resistance, corrosion resistance, good thermal shock resistance, high thermal conductivity, and excellent oxidation resistance. They are primarily used in industries such as medium-frequency casting, various heat-treatment electric furnaces, metallurgy, chemical engineering, and nonferrous metal smelting. Now, let’s take a closer look together. Silicon carbide furnace tube Performance features!

　　Silicon Carbide Furnace Tube Characteristics

　　Silicon carbide furnace tubes are high-quality silicon carbide products made from silicon carbide as the primary raw material and produced through high-temperature firing. They boast excellent properties such as high-temperature resistance, rapid thermal conductivity, high strength, high hardness, excellent wear resistance, good thermal shock resistance, favorable thermal conductivity, and superior oxidation resistance. Equipped with specialized high-temperature insulating covers at both ends, these tubes effectively prevent corrosion of the heating elements (including silicon rods and electric heating wires) by molten metals. All performance indicators surpass those of various graphite products. The silicon carbide protective tubes, widely used in key applications, offer exceptional thermal conductivity, oxidation resistance, thermal shock resistance, and high-temperature durability.

　　Silicon Carbide Furnace Tube Manufacturing Technology

　　This product is an excellent silicon carbide material made by high-temperature firing through a special process, with silicon carbide as the primary raw material. The length standard can be customized according to the customer’s specific requirements.

　　 Silicon carbide furnace tube The first use

　　Widely used in industries such as nonferrous metal smelting, degassing systems for aluminum products, textile dyeing and printing machinery, zinc-aluminum smelting, and processing of related products.

　　Industrial Development of Silicon Carbide Furnace Tubes

　　Silicon carbide (SiC) gate-controlled devices, such as JFETs, feature high input impedance, low noise, and excellent linearity, making them one of the fastest-growing SiC device types and the first to achieve commercialization. Compared with MOSFET devices, JFETs do not suffer from reliability issues caused by gate oxide defects or limitations imposed by low carrier mobility. Moreover, thanks to their unipolar operating characteristics, JFETs maintain outstanding high-frequency performance. Additionally, JFET devices exhibit excellent thermal stability and reliability under high-temperature conditions. Due to the structure of the gate electrode in SiC JFET devices, the threshold voltage of conventional JFETs is typically negative, meaning that most JFETs are normally-on devices—a characteristic that severely hinders their application in power electronics and makes them incompatible with commonly used driver circuits today. By adopting device fabrication processes featuring trench injection or mesa-trench structures, enhanced JFET devices with normally-off operation have been developed. However, since most enhanced JFETs are designed at the expense of a certain forward on-resistance, normally-off (depletion-mode) JFETs are easier to implement for achieving higher power density and current-handling capability. Depletion-mode JFET devices can be connected in cascade—by series-connecting them with low-voltage Si-based MOSFETs—to form a cascaded configuration. The driver circuit for these cascaded JFET devices is naturally compatible with the driver circuits used for conventional silicon-based devices. The cascaded structure is particularly well-suited for high-voltage, high-output applications, offering a direct solution to the driver compatibility challenges that often plague traditional silicon IGBT devices. The advantages of silicon carbide are as follows:

　　1. It has excellent thermal conductivity and thin pipe walls (only a few millimeters thick), responding very sensitively to changes in product temperature.

　　2. Not affected by corrosion

　　3. Does not dissolve at high temperatures; the molten metal remains free of contamination.

　　4. Can be used to dissolve alloys rich in sodium and strontium components;

　　5. The product’s appearance is free of slag, making protection extremely simple.

　　6. High-temperature resistance: 1600;

　　7. Strong resistance to thermal shock

　　8. The product has high hardness and is not easy to break.

　　9. High cost performance and a lifespan of over six months.

　　The above is what has been introduced. Silicon carbide furnace tube Performance features—feel free to contact us anytime if you’d like to learn more!

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