Tungsten Wire Diamond Wire and Cemented Carbide: A New Trend in Technological Integration

In the high-end manufacturing sector, breakthroughs in materials technology often serve as the core driver of industrial upgrading. Currently, the deep integration of tungsten-wire diamond wire and cemented carbide is sparking transformative changes across industries such as photovoltaics and precision machining. This convergence not only overcomes longstanding technological bottlenecks but also gives rise to new application scenarios and industrial ecosystems, emerging as a pivotal force in advancing “new-quality productivity.”

Tungsten Wire Diamond Wire: The “Fine-Wire Revolution” in Photovoltaic Cutting

The photovoltaic industry’s demand for thinner and larger silicon wafers is driving the evolution of cutting technology toward “ultra-fine wire” solutions. Traditional carbon-steel diamond wire, constrained by its strength limit, has struggled to achieve wire diameters below 35 μm; in contrast, tungsten-diamond wire, with its superior tensile strength and wear resistance, has already enabled wire diameters as low as 28 μm—and even finer. Companies such as Xiamen Tungsten and China Tungsten High-tech have enhanced the tensile strength of tungsten wire by doping it with elements like lanthanum and rhenium, reducing wire breakage during cutting by 40% and silicon-material loss by 15%. By 2025, the penetration rate of tungsten-diamond wire in China’s photovoltaic sector had exceeded 50%, and it is projected that wire diameters will fall below 25 μm by 2030, thereby facilitating a shift in wafer thickness from 150 μm to 100 μm.

Behind these technological breakthroughs lies collaborative innovation across the entire industrial chain. Tungsten mining companies have optimized ore-processing techniques, increasing the grade of tungsten concentrate from 0.2% to 0.35% and thereby providing high-quality raw material for tungsten wire production; midstream firms have adopted a combined “spin-forging plus electrolysis” drawing process, boosting the yield of finished tungsten wire from 50% to 70%; and downstream photovoltaic enterprises have upgraded their equipment to ensure seamless compatibility between tungsten-wire diamond wire saws and slicing and cutting machines. This end-to-end collaboration has driven down the cost of tungsten-wire diamond wire from RMB 40 per kilometer to RMB 30, gradually enhancing its economic viability.

Cemented Carbides: From “Industrial Teeth” to the Cornerstone of Precision Manufacturing

Cemented carbides are primarily composed of tungsten carbide, sintered together with binders such as cobalt and nickel. Their hardness is second only to that of diamond, and their wear resistance is 50 times greater than that of high-speed steel. In traditional applications, cemented carbide cutting tools account for 63% of the cutting-tool market and are extensively used in machining automotive engines and aerospace titanium alloys. Meanwhile, with the rapid development of emerging industries such as new-energy vehicles and 5G communications, cemented carbides are shifting from “rough machining” to “precision manufacturing.”

In the new-energy-vehicle sector, cemented-carbide molds have become critical tools for battery electrode-sheet calendering and motor-iron-core stamping. For instance, calendering dies made from ultrafine-grained (sub-0.5 μm) cemented carbide can control electrode-sheet thickness tolerances within ±1 μm, thereby increasing battery energy density by 5%. In the 3C electronics industry, cemented-carbide micro-drills (with diameters of 0.1 mm or less) are used for high-speed PCB drilling, offering a service life three times longer than that of conventional tools. By 2025, the Chinese market for cemented carbides in precision manufacturing had surpassed RMB 20 billion, with a compound annual growth rate of 12%.

The driving force behind technological upgrades stems from innovations in materials design. By employing a gradient structure, the cemented carbide’s surface layer is formulated with a high cobalt content (15%) to enhance toughness, while the core layer features a low cobalt content (6%) to ensure hardness, thereby achieving an optimal balance of rigidity and flexibility. Meanwhile, coating technology has evolved from single-layer TiAlN coatings to multi-layer nano-composite coatings, extending tool life up to eight times its original duration. These innovations have continuously increased the penetration rate of cemented carbides in the machining of difficult-to-cut materials, such as high-temperature alloys and carbon-fiber composites.

Technological Convergence: The Industry Effect of “1+1>2”

The integration of tungsten-wire diamond wire with cemented carbide represents a synergistic innovation between a “high-strength matrix” and an “ultra-hard cutting material.” In the photovoltaic wafer-slicing industry, the combined use of cemented-carbide guide blocks and tungsten-wire diamond wire has effectively addressed the stability challenges arising from the trend toward thinner wires. The high hardness of cemented-carbide guide blocks—92 HRA—significantly reduces wear on the tungsten wire, while their low coefficient of friction—below 0.1—lowers cutting energy consumption, shortening the slicing time per silicon wafer by 20%.

In the field of precision machining, composite technologies that combine tungsten wire substrates with cemented carbide coatings are gaining momentum. For instance, in semiconductor wafer dicing, a tungsten wire substrate coated with a multilayer TiC/AlTiN layer not only maintains a fine wire diameter of 20 μm but also enhances the cutting-edge hardness to 3,200 HV, reducing the wafer breakage rate from 0.5% to 0.1%. This “flexible substrate–rigid coating” design offers a new approach to machining hard and brittle materials.

Industrial-chain integration has accelerated technological convergence. Zhongtung High-Tech has achieved vertical integration by linking tungsten mining, tungsten carbide powder production, cemented carbide sintering, and tungsten-wire diamond wire production, thereby establishing a complete “from ore to cutting tools” value chain. Meanwhile, Xiamen Tungsten Co., Ltd. has partnered with photovoltaic equipment manufacturers to jointly establish a laboratory that has developed an intelligent tension-control system tailored for tungsten-wire diamond wire, boosting the wire-cutting speed to 30 m/s—a level that is now internationally leading.

Future Outlook: Technological Iteration and Ecosystem Restructuring

As the “dual carbon” goals gain momentum, the integration of tungsten-wire diamond wire saws with cemented carbides will evolve toward greener and smarter solutions. On the materials front, the utilization rate of recycled tungsten resources will increase from the current 30% to 50%, and hydrogen reduction will replace carbothermic reduction, cutting carbon intensity by 40%. On the manufacturing side, digital twin technology will enable end-to-end process optimization—from powder formulation to sintering control—thereby improving the consistency of cemented carbide products by 30%. In applications, AI algorithms will dynamically adjust cutting parameters, enabling tungsten-wire diamond wire saws to deliver greater value in the processing of next-generation photovoltaic modules such as heterojunction and perovskite cells.

Technological convergence is not only reshaping the industrial landscape but also giving rise to new business models. For instance, cemented carbide companies are shifting from “selling products” to “providing cutting solutions,” leveraging leasing arrangements to reduce customers’ upfront capital expenditures; meanwhile, tungsten filament producers and photovoltaic firms are jointly building “zero-carbon factories” and sharing the proceeds from carbon-trading initiatives. This ecosystem-based approach will propel China’s transformation from a “materials powerhouse” into a “technology leader.”

On the global stage of high-end manufacturing, the fusion of tungsten-wire diamond wire and cemented carbide represents not only a breakthrough in materials science but also a paradigm shift in industrial thinking. When “hair-thin” tungsten wire meets “rock-hard” cemented carbide, a quiet yet profound transformation is underway—one that redefines precision, efficiency, and sustainability.

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