The Use of Molybdenum and Tungsten in Crucibles

Formed tungsten and molybdenum crucibles perform extremely well in Heat Exchanger Method (HEM) process and are suitable for melting and solidifying of single crystals. Formed crucibles from PLANSEE have thin walls and exhibit superior creep resistance.

Pressed-sintered crucibles from PLANSEE are mainly used in the Kyropolous process for the production of sapphire. When sapphire is easily extracted, better yield and improved quality of sapphire can be realized. PLANSEE’s tungsten and molybdenum-based crucibles are heat-resistant and feature a smooth surface, which make them durable and cost-effective. They are also resistant to corrosion and have a high material density.

PLANSEE’s pressed-sintered crucibles are made from tungsten or molybdenum and have a surface roughness of below 0.8 µm. when the crucible’s surface is rough, the sapphire cannot be easily extracted and this tends to damage the crystal. Besides, the crucible also gets damaged in the process. The ultra-smooth crucibles from PLANSEE eliminate these issues. Sapphire manufacturers can benefit from this product as it eliminates complex and costly processes. In addition, the smooth surface is resistant to corrosion induced by the aggressive melted sapphire. This feature extends the life of the reusable tungsten crucibles.

PLANSEE’s molybdenum crucibles are in huge demand. The reason attributed for this demand is molybdenum is quite complex to develop and involves thorough knowledge with respect to handling the material and setting up the machines. PLANSEE has the required expertise in meeting this demand. According to Heike Larcher, PLANSEE application group manager for Single Crystal Growing, the high-purity material does not contaminate the single crystal.


PLANSEE has extensive expertise in the field of powder metallurgy and develops high purity and high density crucibles that have uniform wall and base thicknesses, which are key prerequisites for attaining excellent creep resistance. Tungsten and molybdenum crucibles are developed in various dimensions. Many customers and major manufacturers across the globe have successfully utilized these crucibles. At PLANSEE, the input material for crucibles is produced in-house from the hot rolling mill, which is touted to be the largest hot rolling mill in the world for refractory metals. Here, massive tungsten and molybdenum sheets are developed which will allow the company to produce products in large dimensions and in huge quantities in the years to come.


PLANSEE manufactures and markets its products worldwide. It is stronger than any alliance and more diversified than single producers. PLANSEE is the most reliable source for high performance components made of refractory metals. It is a market leader in powder-metallurgically produced high performance materials, a genuine technological leader and is a competent development partner. PLANSEE is also customer-oriented, with tailor-made customer services, development and production to suit the requirements of the markets and an expert in applications and materials.

This information has been sourced, reviewed and adapted from materials provided by PLANSEE.

For more information on this source, please visit PLANSEE.


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