30ml High-Temperature Resistant Industrial Pure Zirconium Crucible

Origin: Baoji, Shaanxi, China
Brand: FRL Metal
Name: Pure Zirconium Crucible
Grade: Zr702, Zr705, R60001, R60901
Density: 6.51g/cm³
Thickness: 10-50ml (Custom sizes available)
Standards: ASTM, DIN, EN
Production Process: Hot rolling, cold rolling, annealing
Surface Treatment: Pickling/Bright finish
Certification: ISO9001
Delivery Time: 5-7 days
Payment Method: Wire Transfer (T/T)
Packaging: Standard packaging

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Product Description

Complete Differences Between Pure Zirconium Crucibles (Zr702/R60702) and Zirconium Alloy Crucibles (Mainstream Zr705/R60705) In the industry, pure zirconium crucibles are defined as industrial pure zirconium Zr702; zirconium alloy crucibles are defined as zirconium-niobium alloy Zr705 (containing 2.0~3.0% Nb). The two differ significantly in raw materials, strength, purity, corrosion resistance, and applicable experimental scenarios.

I. Core Differences Between Composition and Grade

1. Pure Zirconium Crucible Zr702 (UNS R60702)
Definition: Industrially pure zirconium, Zr+Hf≥99.2%, only trace impurities, no alloying elements
Composition: Contains only trace amounts of Fe, Cr, O, C, N; Hf≤4.5%, niobium and tin are not present
Purity Advantage: Minimal matrix impurities, almost no foreign element contamination of the sample when smelting active metals

2. Zirconium Alloy Crucible Zr705 (UNS R60705)
Definition: Zirconium-niobium alloy, intentionally reinforced with 2.0%~3.0% metallic niobium
Composition: Zr balance + 2~3% Nb, impurity limit slightly higher than Zr702
Disadvantage: Contains niobium, cannot be used for high-purity experiments requiring absolutely niobium-free impurities.

II. Comparison of Mechanical and High-Temperature Properties

Performance Items	Pure Zirconium Zr702 Crucible	Zirconium Alloy Zr705 Crucible
Room Temperature Strength	Moderate, tensile strength approximately 450MPa, relatively soft texture, excellent plasticity, easily spin-formed into small crucibles. Significantly improved	strength, tensile strength ≈600MPa, yield strength nearly twice that of pure zirconium, higher rigidity.
High Temperature Creep Resistance	Prone to slight deformation under long-term high-temperature load; large-volume thin-walled crucibles are prone to bulging at the bottom.	High-Temperature Rigidity: Highly rigid at high temperatures, resistant to creep and deformation; larger sizes and thicker walls are more durable.
Impact/Abrasion Resistance	Moderate; easily dented by impacts.	Better hardness and abrasion resistance; longer lifespan with repeated filling and erosion.
Processing and Forming	Good ductility; ideal for laboratory crucibles (5~200ml); excellent weldability.	Lower plasticity; more difficult to process; higher cost for the same size.
Ultimate Operating Temperature	Vacuum/Inert long-term ≤1600℃, short-term 1700℃.	Ultimate temperature limits are basically the same. At 1600℃, the deformation is much smaller than that of pure zirconium.

Product Showcase

Comparison table of mechanical properties of industrial pure zirconium crucibles and zirconium-niobium alloy crucibles

III. Chemical Corrosion Resistance & Sample Contamination Differences (Core Selection Criteria for Laboratories)

Pure Zirconium Zr702: Stronger resistance to strong acids (hydrochloric acid, dilute sulfuric acid, hydrofluoric acid systems), molten alkalis, and halogen corrosion.
No niobium precipitation; does not introduce Nb impurities when melting Ti, Zr, rare earths, or high-purity metals.
Suitable for high-purity materials, trace element analysis, semiconductors, and rare earth purification experiments.

Zrconium Alloy Zr705: Corrosion resistance to conventional acids and alkalis is close to that of pure zirconium, but slightly weaker in high-concentration sulfuric acid and chloride media.
The matrix contains niobium; trace amounts of niobium impurities may dissolve in the high-temperature melt, contaminating high-purity samples.
Not suitable for the preparation of materials with strict Nb content limitations.

IV. Molding, Wall Thickness, and Service Life

Small Laboratory Crucibles (5~200ml)

Zr702: Standard Wall Thickness 2-3mm thick, spun in one piece, smooth inner wall, lower price, most common on the market.

Zr705: Requires thicker wall for the same volume, higher processing cost, rarely used for small sizes.

Medium to large industrial crucibles (500ml~10L and above)

Zr702: Prone to bottom bulging under long-term high temperature and pressure, requires thickening to 5-8mm.

Zr705: Stronger rigidity for the same wall thickness, less prone to deformation, service life increased by over 40% after repeated high-temperature melting.

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