Vacuum Induction Melting Inert Gas Atomization is the leading process for the production of a variety of high-performance metal powders and is essential for the quality manufacturing of Ni-based super-alloys as well as Fe-, Co-, Cr-based and other special alloy powders. In the gas atomization system, crucibles, molten metal delivery tube, plug rods, and nozzles play a role in handling molten metal, and the choice of material depends on the alloy, working temperature and design of the equipment.
Boron nitride (BN) is one material considered for several parts of a VIGA system. BN crucibles are used in suitable applications where low wettability and good thermal shock resistance are important. The material is also relatively easy to machine, making it practical for components with customized shapes and dimensions.
BN can also be considered for plug rods and molten-metal flow control parts. These components need to work reliably throughout repeated production cycles, so material selection should take account of the metal being processed, operating temperature and required service life. BN nozzles are another option, depending on the nozzle design and process conditions.
For high-temperature zirconia nozzles, they can be used in air at temperatures over 2,000 °C. Their suitability depends on factors such as thermal conditions, mechanical loading, and contact with the molten alloy.
In application, component dimensions, surface finish, and equipment design can also affect the result. For this reason, it is useful to review the application before deciding which material to use.
Innovacera supplies ceramic components for VIGA gas atomization, including BN crucibles, BN stopper rods, flow control components, BN nozzles, and yellow zirconia nozzles. We focus on assisting clients in comparing various material options for different equipment components.
If you have any material questions for your atomization system, please contact Innovacera’s engineering team at sales@innovacera.com for support.
