Black tungsten wire, with its high melting point, high strength, corrosion resistance, and excellent electron emission properties, plays a significant role in the new energy sector, particularly in the photovoltaic industry, while also showing potential in other emerging energy technologies.
1. Photovoltaic Power Generation: A Key Tool for Silicon Wafer Cutting
In the production of solar panels, silicon ingots must be sliced into paper-thin wafers. Diamond wire is a critical consumable in this process, and black tungsten wire is increasingly used as the substrate (core material) for diamond wires.
Why Choose Black Tungsten Wire? Compared to traditional high-carbon steel wire, black tungsten wire offers superior tensile strength and wear resistance. This leads to:
- Finer Diameter Capability: Steel wire’s breaking strength decreases significantly below 45μm, whereas tungsten wire’s high strength allows it to be made finer (currently, 25–30μm or even thinner tungsten wire is used in large-scale diamond wire applications). Finer wires result in narrower kerf loss during cutting, reducing silicon material waste and lowering costs while meeting the trend toward thinner wafers.
- Longer Lifespan: Higher breaking strength makes tungsten-based diamond wire less prone to breakage during cutting, extending the wire’s lifespan, improving cutting efficiency, and reducing per-cut costs.
- Cutting Stability: Black tungsten wire’s corrosion resistance and low breakage rate contribute to consistent cutting yields.
2. Other Applications in New Energy
The properties of black tungsten wire also enable its use in other areas of the new energy sector:
- Heating Element in High-Temperature Furnaces: In the preparation of foundational materials for new energy applications (e.g., semiconductors, polycrystalline silicon for photovoltaics, or sintering/purification of lithium battery cathode materials), high-temperature environments above 2000°C are required. Black tungsten wire, with its high melting point (up to 3422°C) and excellent resistance to deformation at high temperatures, is commonly used as a heating element in vacuum or inert gas-protected high-temperature furnaces.
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