Core material and specification: High-purity tungsten (W≥99.95%), with a minority being tungsten-rhenium (W-Re) alloy. Density: Conventional 18.5~19.3 g/cm³ (high-density version ≥18.8 g/cm³). Melting point: 3410℃ (the highest among metals).
Key Performance 1. Extreme High Temperature Resistance (Stable up to 2600℃) It can operate stably for extended periods in a vacuum/inert atmosphere ranging from 2200 to 2600℃, without melting, deforming, or volatilizing. 2. The chemical is extremely stable and does not contaminate materials. It barely reacts with most metals (titanium, zirconium, molybdenum, rare earths), molten salts, and quartz glass at high temperatures. It ensures zero impurity contamination and guarantees the quality of high-purity materials. 3. Fast thermal conductivity, small thermal expansion, and a thermal conductivity coefficient much higher than that of ceramics/graphite, ensuring uniform temperature distribution; an extremely low thermal expansion coefficient, resulting in high dimensional accuracy at high temperatures. 4. Resistant to thermal shock and long-lasting, it is resistant to rapid cooling and heating, making it less prone to cracking; it is tougher than ceramics and more resistant to oxidation than graphite, with a service life far exceeding that of traditional crucibles. 5. With low vapor pressure and minimal outgassing under high-vacuum and clean high-temperature conditions, it is an ideal container for high/ultra-high vacuum environments.
Mainstream manufacturing processes include sintered type (most commonly used): tungsten powder is molded and sintered at high temperatures (2300℃+), resulting in high density, good integrity, and suitability for large sizes. Spinning/stamping type: tungsten plates/sheets are spun into shape, with thin walls and high smoothness, suitable for small/medium-sized crucibles. Welding type: tungsten plates are cut, rolled, and welded into shape, allowing for ultra-large diameters and deep cavity structures. Turning type: tungsten rods are directly turned, achieving high precision and no welding seams, suitable for small, high-precision crucibles.
Main application areas (essential for ultra-high temperatures) 1. Sapphire/monocrystal growth (largest market) Sapphire (Al₂O₃) crystal growth furnace core container, with a working temperature of 2050~2200℃, directly determines the crystal quality. 2. Rare earth metal smelting and melting Strongly corrosive rare earths (lanthanum, cerium, neodymium, etc.), resistant to melting and corrosion, non-polluting, and long-lasting. 3. Quartz glass melting High-temperature fused silica, resistant to glass liquid erosion, without generating bubbles and impurities. 4. Smelting of high melting point metals involves the melting of rare metals such as titanium, zirconium, niobium, molybdenum, and vanadium. 5. Semiconductor/electronics/vacuum industry evaporation coating, electron beam crucible, high-temperature sintering boat, vacuum furnace insulation/structural components. 6. High-temperature test vessels for aerospace and nuclear industries, sintering of special alloys, and nuclear fuel containers.
