Molybdenum and Tungsten for Furnaces used in Growing Sapphire Crystals

H.C. Starck’s portfolio supports the LED market with products critical to the success of the sapphire crystal-growing industry’s high temperature furnaces. There’s remarkable growth in the production of these custom-made, high temperature vacuum or argon atmosphere furnaces for growing sapphire crystals used in the production of LEDs. These furnaces have unique and demanding hot zone designs for melting alumina in crucibles for precise, highly controlled crystal growth.

Whether by KY, EFG, CZ, or HEM-like (GTAT, CHES, and VHGF), H.C. Starck is well versed in these different sapphire crystal growth methods and supplies engineered product solutions for all technology platforms.

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 supplied by H.C. Starck. Machined and fabricated products from molybdenum and tungsten plate, sheet, and foil include:

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

Molybdenum and Tungsten Furnace Components in Phosphors Production for LEDs

MOCVD equipment plays an important role in the LED manufacturing process. H.C. Starck’s product solutions are fabricated from molybdenum and tungsten materials for complex assembly configurations:
  • Collector rings
  • Heaters
  • Wafer carriers
  • Heat sinks

Additionally, we offer molybdenum and Mo-Cu clads materials for base plates and heat spreaders for heat dissipation in LED devices.


Product brochures

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Product data sheet

  • Language
  • PDS number/_version
  • MP35N Alloy (UNS R30035)
  • en
  • PD-7046_2