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High Purity 99.95% Tantalum Ta Crucibles
High purity (99.95%) tantalum crucibles deliver ultra‑clean containment for industrial processes where trace impurities critically affect material properties, product yield, or process repeatability.
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Description
Technical Parameters
Defining High Purity in Tantalum Crucibles
High purity (99.95%) tantalum crucibles deliver ultra‑clean containment for industrial processes where trace impurities critically affect material properties, product yield, or process repeatability.
A 99.95% purity level means the tantalum matrix contains ≤0.05% total metallic and gaseous impurities, with key contaminants such as Fe, Ni, Cr, and O held below tens of ppm. This grade is achieved through double vacuum arc remelting (VAR) or electron beam melting (EBM) followed by zone refining, ensuring homogeneity and removal of volatile species. The remaining impurities are carefully controlled to prevent unwanted reactions with molten contents, especially in high‑value metal and ceramic production.
Impurity Element
Maximum Allowable (ppm)
Effect if Exceeded
Iron (Fe)
50
Can catalyze unwanted phase formation in alloys
Nickel (Ni)
30
May alter corrosion resistance of processed melt
Oxygen (O)
20
Causes embrittlement at high temperatures
Carbon (C)
50
Introduces carbide inclusions in metals
Industrial Applications Leveraging High Purity Tantalum Crucibles
These crucibles are widely adopted in sectors where product cleanliness is non‑negotiable:Rare Earth Metal Reduction – Contain molten fluorides or chlorides during electrolytic or metallothermic reduction, preventing contamination of neodymium, dysprosium, or yttrium.Semiconductor Component Fabrication – Hold high‑purity metals for sputtering target production, ensuring deposition layers meet electronic-grade standards.Nuclear Material Handling – Safely melt and cast uranium or thorium alloys with minimal neutron‑absorbing impurity introduction.Their high melting point (3017 °C) and chemical inertness toward acids, molten salts, and reactive metals allow use in continuous high‑temperature campaigns, reducing downtime associated with crucible changeovers.
Performance Advantages in Extreme Conditions
Thanks to low vapor pressure even above 2500 °C, 99.95% crucibles experience negligible mass loss, preserving dimensional accuracy over long service periods. The fine, recrystallized grain structure enhances creep resistance, making them suitable for loads up to 10 MPa at 2000 °C. Their polished surface (Ra ≤ 0.8 µm) minimizes nucleation sites, facilitating easy removal of solidified melts and simplifying cleaning protocols in automated production lines.
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