702Zircon crucible

702 Zirconium Crucible (Zr702/R60702) is a high-performance, high-temperature, and corrosion-resistant container precision-machined from industrial pure zirconium (Zr702 alloy). It is a core consumable in high-end metallurgy, chemical, semiconductor, and scientific research laboratories.

I. Product Introduction

1. Material Standard
Grade: Zr702 (UNS R60702)
Standard: ASTM B550
Composition: Zr+Hf ≥ 99.0%, Hf ≤ 4.5%, Fe+Cr ≤ 0.20%, O: 0.11~0.15%
Purity: Industrial grade ≥ 99.2%, high purity up to 99.6%

2. Core Physical Properties
Density: 6.51 g/cm³
Melting Point: 1852 ℃
Maximum Operating Temperature: Approximately 2200 ℃ under vacuum/inert atmosphere
Coefficient of Thermal Expansion: 5.8×10⁻⁶ /℃ (20~300℃)
Thermal Conductivity: ~21 W/(m・K) (room temperature)

3. Key Characteristics

Excellent Corrosion Resistance: Forms a dense oxide film (ZrO₂) on the surface, resistant to hydrochloric acid, sulfuric acid, alkali solutions, seawater, and chlorides, superior to titanium and stainless steel.
Good Thermal Shock Resistance: Not prone to cracking under rapid heating and cooling.
High High Temperature Strength: Low creep at high temperatures under vacuum/inert environments.
Low Pollution: High metal purity, does not react with most molten metals, ensuring high purity of the melt.
Good Machinability: Can be machined and welded to various specifications.

4. Common Specifications

Volume: 10ml ~ 500ml (standard), larger caps can be customized.

Shape: Cylindrical, conical, with cap / without cap.

Wall Thickness: 1.0~3.0mm (commonly 2.0mm)

II. Main Application Areas

1. Precious Metal Smelting and Refining
High-temperature smelting of platinum (Pt), rhodium (Rh), palladium (Pd), gold (Au), silver (Ag), etc.
Preparation of jewelry, industrial catalysts, and electronic pastes.
Advantages: Does not react with precious metals, no carbon pollution, long lifespan, and better cost-effectiveness than platinum crucibles.

2. Special Metallurgy and Vacuum Smelting
Smelting of active metals: titanium (Ti), tantalum (Ta), niobium (Nb), zirconium (Zr)
Precision casting of nickel-based and cobalt-based aerospace alloys
Preparation of rare earth metals and permanent magnet materials (such as NdFeB).
Advantages: Good vacuum stability, low vapor pressure, resistance to melt erosion, and accurate alloy composition.

3. Chemical Analysis and Sample Pretreatment
Decomposition of insoluble minerals, rocks, and ceramics by melting with strong alkalis (Na₂CO₃, Na₂O₂)
High-temperature calcination, ashing, and digestion
Reaction vessels for highly corrosive media (hydrochloric acid, sulfuric acid, alkaline solutions).
Advantages: Replaces platinum crucibles, lower cost, alkali resistance, and good thermal shock resistance.

4. Nuclear Industry (Non-Core Structures)
Nuclear Fuel Reprocessing, Radioactive Sample Processing
Advantages: Small neutron absorption cross section, resistant to strong radiation and nuclear media corrosion
5. Chemical Industry and Corrosive Environments
High-Temperature and High-Pressure Reactors, Evaporation/Concentration Vessels for Corrosive Media
Seawater Desalination, Chlor-Alkali Chemical Industry, Organic Acid Process Equipment
Advantages: Comprehensive corrosion resistance, lifespan far exceeding stainless steel and titanium

III. Precautions for Use
Incompatible Media: Hydrofluoric acid (HF), fluoride ions, concentrated phosphoric acid (>50%), aqua regia
Atmosphere Limitations: Slow oxidation occurs at high temperatures (>600℃) in air; **vacuum/inert atmosphere (Ar)** is recommended.
Usage Limits: ≤700℃ in air, ≤2200℃ in vacuum/inert atmosphere.

Quality Control and Testing

Each product undergoes rigorous inspection before shipment:

Dimensional Inspection: Precise measurement of thickness, length, and width

Chemical Composition and Mechanical Property Analysis: Third-party testing reports

Surface Inspection: Visual and microscopic inspection for defects

Ultrasonic Testing: Detection of internal defects

Why Choose Us

Technology and Quality: Located in Baoji, China's Titanium Valley, we possess professional production technology and extensive experience in non-ferrous metal manufacturing.

Global Coverage: We provide consistently high-quality products to customers in Australia, South Korea, Germany, the USA, the UK, Malaysia, and the Middle East.

Quality Commitment: We never compromise on quality and are responsible for every product we manufacture.

Technical Support: We have professional personnel overseeing the entire process from raw materials to finished products!

Contact Us

Our team is dedicated to serving you and hopes that every product you purchase will meet your expectations!

Email: lucky@bjfreelong.com

WhatsApp: +86 13335371763

Please contact us for detailed quotations and technical specifications. We look forward to becoming your trusted high-end titanium materials partner.