TUNGSTEN CRUCIBLES FOR SAPPHIRE CRYSTAL GROWTH (LED) IN HIGH TEMPERATURE FURNACES

The furnace industry has seen a remarkable growth in the production of custom-made, high temperature vacuum or argon atmosphere furnaces for growing sapphire crystals used in manufacturing of LEDs. These furnaces have unique and demanding hot zone designs for melting alumina in crucibles for precise, highly controlled crystal growth.

H.C. Starck is fully aware of the various sapphire crystal growing methods and supplies components to the customers accordingly.

The hot zones in sapphire growing furnaces use H.C. Starck’s molybdenum and tungsten products for furnace components and fixtures. These high temperature materials are characterized by their high thermal and electrical conductivity, low coefficient of thermal expansion, and excellent strength and stability at temperatures above 2,000°C.

Customer specific furnace components and fixtures for high temperature furnaces are uniquely designed and are supplied by H.C. Starck.

Tungsten Crucibles – Powder Metallurgy

  • Pure Tungsten (99.95% minimum)
  • MoW Blend (percentages vary depending on customer requirements)

Tungsten Plate, Sheet, and Foil are used for:

  • Seed Holders
  • Heat Shields
  • Heating Element Materials
  • Other Support Components

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