Breakthrough in Ultra-Fine Tungsten Wire Technology Boosts Diamond Wire Cutting Efficiency大幅

In the current era of rapid growth in the photovoltaic and semiconductor industries, cutting technology—as a core process—directly impacts material utilization, production efficiency, and product yield. In recent years, breakthroughs in ultra-fine tungsten wire technology have propelled diamond-wire cutting to new heights, injecting strong momentum into industrial upgrading.

The Bottleneck of Traditional Cutting Techniques and the Rise of Tungsten Wire

Thanks to its high efficiency and low material loss, diamond-wire cutting has fully replaced slurry-based cutting as the mainstream process for slicing photovoltaic silicon wafers. However, as wafers continue to trend toward larger sizes and thinner thicknesses, the physical limitations of conventional high-carbon steel wire saws are becoming increasingly apparent: when the wire diameter is reduced below 35 μm, the breaking tensile strength of the high-carbon steel wire drops markedly, making wire breakage more likely during cutting and leading to silicon material waste and production downtime. For example, when cutting a 50-mm-diameter SiC ingot, a conventional diamond wire saw typically requires about 23 hours, while the wire itself suffers severe wear, directly impacting wafer warp and reducing equipment service life.

Against this backdrop, tungsten wire stands out due to its unique physical properties. With a melting point as high as 3,410°C and a tensile strength more than 1.5 times that of high-carbon steel wire, tungsten also exhibits excellent corrosion and oxidation resistance. These characteristics make tungsten wire an ideal material for overcoming the bottleneck of ultra-fine wire production—its diameter can be reduced to below 30 μm while maintaining high breaking strength and dimensional stability, thereby laying the foundation for improving the efficiency of diamond-wire cutting.

Breakthrough in Ultra-Fine Tungsten Wire Technology: Bridging the Gap from Laboratory to Industrial Scale

The production of ultrafine tungsten wire faces two major core challenges: first, how to reduce the wire diameter from the millimeter scale down to the micrometer scale; and second, how to ensure that the refined wire retains high strength and uniformity. Traditional wire-drawing processes are unable to produce ultrafine tungsten wire with diameters ranging from 2.5 to 10 μm due to difficulties in manufacturing micro-porous diamond dies and insufficient precision of drawing machines. Consequently, electrochemical polishing has emerged as a critical breakthrough.

Electrolytic polishing achieves diameter reduction of tungsten wire through an anodic redox reaction: in an alkaline electrolyte, the tungsten wire serves as the anode, losing electrons; surface tungsten oxide is formed and dissolves into the solution, thereby progressively refining the wire’s diameter. This process requires precise control of electrolyte composition, current density, temperature, and wire-feeding speed. For example, using a composite electrolyte consisting of 5% sodium hydroxide and 5% potassium carbonate, combined with a high-frequency regulated power supply and a circular electrode design, enables uniform diameter reduction while reducing surface roughness to the nanometer scale. Companies such as Xiamen Tungsten have, through iterative refinement of rotary forging, drawing, and electrolytic processes, successfully achieved mass production of tungsten wire mother rods with diameters below 30 μm, exhibiting a tensile strength of at least 1.08 N/mg and a breakage rate that is 80% lower than that of high-carbon steel wire.

Tungsten Wire Diamond Wire: A Dual Leap in Cutting Efficiency and Cost-Effectiveness

The application of tungsten-wire mother lines has brought about a qualitative leap in the efficiency of diamond-wire cutting. In the photovoltaic sector, when tungsten-based diamond wire is used to cut monocrystalline silicon, wire consumption is reduced by 50%, the number of wafers produced per blade pass increases by 15%, and the thickness of the surface damage layer on the wafers drops from 10 μm to below 5 μm, thereby significantly reducing losses in subsequent grinding and polishing processes. Taking a 20-mm ingot as an example, conventional diamond-wire cutting yields 22 wafers, whereas tungsten-wire diamond-wire cutting can produce 30 wafers, resulting in a 36% improvement in silicon-material utilization.

In the semiconductor industry, tungsten-wire diamond wire sawing is gradually replacing slurry-based cutting. Taking silicon carbide (SiC) wafer slicing as an example, conventional slurry cutting requires 23 hours to process a single ingot, whereas tungsten-wire diamond wire sawing completes the task in just 8 hours. Moreover, the kerf width is reduced from 150 μm to 125 μm, and the number of wafers obtained per ingot increases by 20%. In addition, the superior wear resistance of tungsten wire extends the service life of the wire saw by a factor of ten, boosts equipment utilization from 60% to 70%, and lowers overall costs by more than 30%.

Industrial Chain Collaboration: Comprehensive Upgrades from Materials to Equipment

The widespread adoption of tungsten-wire diamond wire saws hinges on collaborative innovation across the entire industry value chain. On the materials side, Xiamen Tungsten has developed high-strength tungsten-based alloy mother wires by doping with metals such as rhenium and lanthanum, resulting in a 50% increase in impact coating thickness and a significant improvement in grit uniformity. On the equipment side, companies like Wuxi Da Vinci have introduced tungsten-wire loop-cutting technology that employs pure-water cooling and physical cutting to efficiently separate metal 3D-printed substrates made from titanium alloys and high-temperature alloys, achieving a cutting efficiency 30 times higher than conventional electrical-discharge machining while reducing energy consumption by 80%.

Future Outlook: Dual-Drive Momentum from Fine-Grained Optimization and Intelligentization

With the continuous optimization of tungsten-wire technology, diamond-wire cutting is advancing toward “finer, stronger, and smarter” solutions. By 2026, market penetration of tungsten-wire diamond wire is expected to exceed 80%, with wire diameters further reduced to below 25 μm. Meanwhile, the integration of AI algorithms and sensor technologies will enable real-time monitoring of the cutting process and adaptive adjustment of process parameters, driving yield improvements from 90% to over 98%.

The breakthrough in ultra-fine tungsten-wire technology represents not only a triumph for materials science but also a pivotal step toward more efficient, low-carbon manufacturing in the photovoltaic and semiconductor industries. As the technology advances and costs decline, tungsten-wire diamond wire is poised to become the standard cutting solution for next-generation hard and brittle materials, providing critical support for the global energy transition and the digital economy.

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