Description

Technical Parameters

Common Pure Tantalum Crucible Parts & Functions

Lids: Dome-shaped or flat, with sealing grooves to retain inert atmospheres (e.g., Ar) during melting. Reduces oxidation of reactive melts (e.g., titanium).

Spouts: Angled or straight, tapered to control molten flow during pouring. Made from same-purity Ta to avoid contamination at joints.

Thermocouple Wells: Cylindrical sleeves inserted into crucible walls, housing K-type or S-type thermocouples for real-time temp monitoring (±1°C accuracy).

Support Rings: Flat rings beneath the crucible, distributing load to prevent deformation on heating plates.

Part Type	Material Purity	Key Function	Design Consideration
Lid	≥99.95%	Atmosphere containment	Sealing groove depth (0.5–1 mm)
Spout	≥99.95%	Controlled pouring	Taper angle (30–60°) for smooth flow
Thermocouple Well	≥99.98%	Temp measurement	Wall thickness (1–2 mm) to minimize lag
Support Ring	≥99.95%	Load distribution	Outer diameter matching crucible base

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Fabrication & Integration of Pure Tantalum Crucible Parts

Parts are machined from the same billet as the main crucible to ensure uniform purity and thermal expansion (Ta's CTE: 6.5×10⁻⁶/°C). Joining methods include:

Brazing: Using Ta-based filler (e.g., Ta-10W) in vacuum furnaces (10⁻⁴ Pa) to avoid oxide formation at joints.

Mechanical Fastening: Threaded or clamped connections, with Ta washers to prevent galvanic corrosion.

Application-Specific Customization

For crystal growth, spouts may be eliminated to avoid flow disturbances; for high-temp sintering, lids integrate radiation shields. In nuclear settings, parts are radiologically clean (no Co-60, Cs-137) and pass leak testing (helium mass spec, sensitivity 10⁻¹² atm·cc/s) to prevent isotope leakage.

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