2mm thick Zr705 (R60705 / Zr-2.5Nb) research zirconium crucible

1. Material grade standards

The Zr705 zirconium crucible base material is a zirconium-niobium alloy Zr-2.5Nb, conforming to the American standard UNS R60705 and the standards ASTM B550 and GB/T 8769, which is different from pure zirconium Zr702. The alloy matrix contains 2.0% to 3.0% metallic niobium, with the balance being zirconium + hafnium (Hf≤4.5%), and the total impurities of Fe+Cr ≤0.2%, with strictly controlled oxygen content.

2. Core Physical and Mechanical Properties (Core Advantages Compared to Pure Zirconium Zr702)

High Temperature Resistance: Melting point 1852℃, long-term stable operating temperature ≤1800℃, far superior to titanium and stainless steel crucibles; does not soften, deform, or leak at high temperatures.

High Strength and Toughness: Tensile strength ≥550MPa, approximately 45% higher than pure zirconium Zr702; strong resistance to high-temperature creep; impact and thermal shock resistant, suitable for thin-walled, large-size crucibles; lighter weight for the same volume, less prone to cracking; maintains good plasticity at both low and high temperatures; not easily fatigued or damaged by repeated temperature changes.

Extreme Corrosion Resistance: Forms a dense, self-healing ZrO₂ passivation film on the surface, resistant to boiling concentrated hydrochloric acid, dilute sulfuric acid, phosphoric acid, hydrofluoric acid, and various organic acids, strong alkalis, molten alkaline salts, and molten fluorides; almost no ion precipitation under high-temperature, highly corrosive conditions, does not contaminate materials.

Low impurities, high purity isolation: Extremely low impurities ensure that the smelting/dissolving process does not introduce impurities such as iron, nickel, and chromium, significantly reducing costs compared to platinum crucibles; non-magnetic and does not adsorb precious metals or rare earth melts.

3. Production Process and Specifications
Forming process: Spin forming, forging + machining, seamless welding; weld corrosion resistance consistent with the base material; mirror polished surface Ra0.2～3.2μm, free of sand holes and pores.

Standard specifications: Laboratory miniature 5ml～500ml; Industrial large crucibles: diameter 10～700mm, height 25～900mm, wall thickness 3～30mm; customizable straight, conical, capped, spouted, and rectangular irregular-shaped crucibles are available.

Supply condition: Annealed, eliminating processing stress and enhancing thermal stability.

Zircon crucible composition comparison table

Zircon crucibles only use the method

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