Molybdenum

Molybdenum powder is a fundamental material used in the production of various molybdenum-based components and alloys, known for their high melting point, thermal conductivity, and low thermal expansion. Key parameters that define the quality and usability of molybdenum powder include:

  1. Particle Size Distribution: Measured in microns, particle size influences the flowability, pressing behavior, and final density of sintered parts. A narrow particle size distribution ensures consistent properties in the end product.
  2. Purity: The content of molybdenum in the powder, typically expressed as a percentage, with high-purity powders (≥99.95%) required for applications in semiconductor manufacturing, electronic components, and high-temperature applications.
  3. Density: Bulk density and tapped density are important for handling and processing, affecting how the powder packs and flows during pressing and shaping operations.
  4. Oxygen Content: Crucial for many applications, a low oxygen level enhances the material’s performance at high temperatures and reduces the risk of oxidation during processing and use.
  5. Surface Area: The specific surface area (SSA) affects the reactivity of the powder, which is important for processes like chemical vapor deposition (CVD) or powder metallurgy techniques.
  6. Shape and Morphology: Particle shape, whether spherical, irregular, or flake-like, impacts the packing efficiency and the mechanical properties of the final sintered component.
  7. Flowability: Determines how well the powder flows through handling equipment, which is influenced by particle size, shape, and surface conditions.
  8. Sinterability: The capacity of the powder to form a coherent, dense structure under heat and pressure. This is influenced by particle size, purity, and the presence of sintering aids if used.
  9. Impurities: Trace elements like sulfur, carbon, or metals can affect the powder’s performance and the properties of the final product. Their levels should be carefully controlled.
  10. Dustiness: The generation of dust during handling is a concern for worker safety and product consistency. Low-dust powders are preferred.

  11. Microstructure: The microstructural characteristics, such as grain size and distribution, can greatly influence the mechanical properties and performance of the sintered molybdenum part.

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