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Core Functions
Carbon felt used for thermal insulation in the low-temperature zones of monocrystalline and polycrystalline silicon smelting furnaces primarily refers to non-graphitized polyacrylonitrile-based (PAN-based) or rayon-based carbon fiber felts. Characterized by low thermal conductivity, high specific heat capacity, and excellent chemical stability, these materials are suitable for long-term operation in environments ranging from 300°C to 1200°C.In photovoltaic and semiconductor thermal field systems, carbon felt serves as a critical thermal insulation material. It is widely utilized in the low-temperature zones-such as furnace walls, crucible support structures, and the periphery of heating elements-of monocrystalline pulling furnaces and polycrystalline ingot casting furnaces, where it functions to minimize heat loss and maintain the stability of temperature gradients.
1. Efficient Thermal Insulation; Reduced Energy Consumption
The thermal conductivity of carbon felt ranges from a mere 0.05 to 0.2 W/(m·K)-significantly lower than that of metals and conventional refractory materials. This property enables it to effectively block heat conduction toward the exterior of the furnace body, thereby enhancing energy utilization efficiency and lowering the electricity cost per unit of silicon ingot production.
2. Maintenance of Thermal Field Uniformity
During the shoulder formation and constant-diameter growth phases of monocrystalline silicon production, precise control over axial and radial temperature distribution is essential. By allowing for adjustments in thickness and installation configuration, carbon felt assists in establishing the ideal temperature gradient, thereby minimizing the generation of crystal defects (such as dislocations and twins).
3. Lightweight and High-Strength, Facilitating Installation and Maintenance
Compared to rigid graphite materials, carbon felt possesses a soft texture and can be easily cut or folded to conform to complex thermal field structures. Furthermore, its extended service life results in less frequent replacement requirements, thereby reducing furnace downtime.
Applications
1. Photovoltaic Crystalline Silicon Manufacturing Hot Zone
As a core insulation material, it is widely used in photovoltaic crystalline silicon manufacturing hot zone systems to help achieve heat insulation and temperature control in high-temperature environments.
2. Semiconductor Manufacturing Processes
Suitable for the high-temperature vacuum environment of semiconductor wafer production equipment, ensuring stable equipment operation.
3. Battery Industry
Used as an electrode material for flow batteries, it combines conductivity and corrosion resistance. It is a commonly used electrode material for vanadium-ion batteries.
4. Aerospace and Defense Industry
As a composite material substrate, it is used in the manufacture of high-temperature structural components.
5. Industrial Furnace Insulation
In processes such as vacuum metallurgy and powder metallurgy, it achieves heat insulation and energy saving for high-temperature equipment.
Product Parameters
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