White Tungsten Wire

Product Overview and Design Highlights

    In high-tech fields such as vacuum electronic devices, medical minimally invasive interventional devices, semiconductor probe stations, and high-temperature Evaporation Coating (Evaporation Coating), black tungsten wires with residual black oxide layer or graphite lubricant on the surface are often unable to be used directly, and are very easy to be used in Ultra-high vacuum (UHV) or dust-free secondary pollution. Our high-purity precision washed tungsten wire (Cleaned/Chemically Polished White Tungsten Wire) completely removes the graphite coating layer on the surface through a rigorous electrolytic polishing or chemical cleaning process, presenting a very bright silver-white metallic luster (Metallic Silver Finish).

    As shown in the real picture, the white tungsten wire is evenly and tightly wound with a high-precision Plastic Spool (Plastic Spool), and the wire diameter is continuous without knots or broken wires. The material is high-quality and high-density powder metallurgy tungsten billet, which has been drawn by multi-pass Diamond Die Drawing (Diamond Die Drawing) micron-scale and annealed in high vacuum (In-Line Vacuum Annealing). This enables white tungsten wire not only to have extremely High Tensile Strength (High Tensile Strength) and uniform tolerance of wire diameter (Diameter Tolerance ≤ ± 1%), but also to have excellent unwinding smoothness and Straightness (Straightness), which can be directly assembled in automated production lines without additional surface cleaning processes.

Performance Features and Core Values

  1. Eliminate high temperature sagging-Doped Non-Sag WAL Technology (Doped Non-Sag WAL Technology)

    In the application of high-temperature elements (such as electric light source filament and high-pressure vacuum thermal field heating stranded filament), pure tungsten filament is prone to grain boundary sliding and serious sag deformation after Recrystallization. We offer specialized WAL-doped anti-sagging white tungsten wires, which are doped by trace amounts of potassium (K) element to form axially aligned "Potassium Bubble Rows" during the drawing process. This greatly increases the recrystallization temperature (≥ 2100 °C), making it still have good mechanical shape stability under long-term electrification at ultra-high temperatures.

  2. High Tensile Strength & Fine Wire

    With the precise balance of multi-pass deep Cold Working and annealing process, our fine white tungsten wires have extremely high Tensile Strength (up to 2000-3500 MPa) under the same wire diameter, and are not easy to break under high tension pull by automatic winding machines or mesh weaving machines, which is very suitable for semiconductor Wafer Test Probes (Wafer Test Probes) and high-precision mesh weaving.

  3. UHV Compatibility & Ultra-Clean Surface

    After special chemical film and ultrasonic deep degreasing cleaning, the surface of Scheelite wire is completely oil-free and carbon-free. When used in ultra-high vacuum above 10 ° Pa, there will be no Out-gassing, and it can be directly used as a mass spectrometer ionization source, electron microscope cathode emitter, and PVD thermal evaporation strand (Tungsten Evaporation Coil/Stranded Wire).

  4. Medical & Semiconductor Grade Customization

    For the medical field (such as electric cutter wires, minimally invasive surgical guide wires) and medical imaging equipment (X-ray tube cathode wires), we can provide specific length Cut-to-Length Straight Rods with electrolytic mirror-level polishing, burr-free, and excellent biocompatibility (Cut-to-Length Straight Rods), strict tolerance requirements.

Core technical parameters and specifications

    Basic physical and chemical properties

    Dimensions Specifications and Machining Techniques

Typical application areas

    Semiconductor & Electronics: IC packaging and testing probe cards (Probe Card Wires), electron tube cathodes, picture tube electrodes and vacuum-coated thermal evaporation strands.

    Medical Devices: Medical high-frequency electric cutting wires, minimally invasive surgical guide wires, X-ray radiation shielding screens and medical detection electrodes.

    Industrial Heating Elements: Sapphire crystal growth furnace heating wires, vacuum furnace nets, thermocouple protection wires, and mono-crystalline silicon growth furnace auxiliary components.

    Precision Mesh & Automotive: high-strength tungsten wire protection mesh, Automotive glass electric heating filament, etc.

Quality Control and Export Packaging

    Each roll of white tungsten wire has undergone rigorous resistivity testing, full-process monitoring of wire diameter laser scanning gauge and tensile strength testing by tensile machine before leaving the factory, and an inspection report (MTC) complying with EN 10204 3.1 standard is attached. In order to prevent the spools from being oxidized by moisture or knotted in disorder during cross-border transportation, the spools are vacuum packaged in sealed moisture-proof plastic bags (with desiccant), and the outer layer is nested with exclusive shock-proof shaping foam, which is packed into export-grade fumigation-free hard cartons or In the wooden box, it is ensured that the buyer can directly go online after opening the seal.