The manufacturing of tungsten rods needs to break through technical bottlenecks such as high brittleness and difficult processing. The mainstream processes are as follows:
Powder metallurgy method
Steps: tungsten powder (purity ≥99.95%) → isostatic pressing → pre-sintering (1200-1500°C) → vertical melting sintering (2800°C, hydrogen protection) → rotary forging/drawing → final annealing.
Key control: sintering density must reach more than 98% of the theoretical value (18.8 g/cm³) to avoid pores causing fractures.
Smelting method
Electron beam melting (EBM): melt tungsten ingots under 10⁻⁴ Pa vacuum to remove gas impurities, and the purity can reach 99.999%.
Application: semiconductor ion implantation machine components, nuclear fusion device first wall material.
Surface strengthening technology
Rhenium plating layer: inhibit the high temperature growth of tungsten grains and improve the strength above 1500°C (creep resistance increased by 30%).
Carburizing treatment: surface hardness is increased to HV2200 (conventional tungsten rod HV1400), used for cutting tools.
Tungsten Rod Product Details Picture Display
