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Tungsten Chuck for Sapphire Crystal Growth Furnace

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Tungsten Chuck can hold a small crystal with a specific crystal orientation, that is, a seed crystal, to guide the growth of the crystal, which plays an important role in the process of sapphire crystal growth. Heeger Materials offers top-quality Tungsten Chuck at competitive prices, with customized options for shapes and dimensions to meet specific requirements.

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The Tungsten Chuck, with its high melting point, strength, wear resistance, and oxidation resistance, maintains stability and integrity in high-temperature, high-pressure, and high-gas-flow conditions, preventing seed crystal deformation and fracture.

HM is a leading supplier of high-quality Tungsten and molybdenum parts for high-temperature and vacuum furnaces, including Tungsten Birdcage Heaters, Molybdenum Chucks, Molybdenum Heavy Hammers, Molybdenum Guide Shells, etc. Tungsten Chuck for Sapphire Crystal Growth FurnaceTungsten Chuck for Sapphire Crystal Growth Furnace

Tungsten Chuck Specifications




≥19.2 g/cm3

Application ambient temperature


The coefficient of thermal expansion (0-1600℃)


Yield Strength (2080℃)

25 Mpa

Full recrystallization temperature


Dimensions and Tolerances

The specific dimensions and tolerances of the seed crystal chucks are customized and processed according to customer drawings to meet specific requirements.

Tungsten Chuck Quality Control

  • Each seed crystal chuck must undergo strict ultrasonic flaw detection in every process before machining, and the inspection is qualified before further processing.
  • Every finished seed crystal chuck must be 100% inspected and have a record of size inspection, and unqualified products are not allowed to leave the warehouse.

Tungsten Chuck Storage and Usage Recommendations

  • When storing the seed crystal chucks, the relative humidity of the environment in which they are stored should not be higher than 60%, otherwise, they will oxidize very easily.
  • Tungsten Seed Crystal chucks are stronger than molybdenum seed chucks at high temperatures, but both will crystallize and become brittle. Whether tungsten or molybdenum seed crystal chucks are used, they have completely recrystallized and become brittle after one furnace. Care must be taken during subsequent use to prevent the seed crystal chucks from fracturing on the way to long crystals.

Tungsten Chuck Applications

  • Monocrystalline silicon
  • Sapphire
  • Yttrium aluminum garnet

Tungsten Chuck Packing

Tungsten Chuck for Sapphire Crystal Growth Furnace will be tagged and labeled externally to ensure efficient identification and quality control. Great care will be taken to avoid any damage caused during storage or transportation. They will be packed in a carton or wooden case supported with soft materials to ensure the products will not shift inside the cases.

Tungsten Chuck Packing

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