Overview
Zirconium discs, also called zirconium round cakes, are precision-engineered metal components primarily used in industries requiring extreme corrosion resistance and thermal stability. These discs are typically manufactured from commercially pure zirconium (Zr702) or zirconium-niobium alloys (Zr705), depending on the application's mechanical and chemical demands. Zirconium's unique properties stem from its passive oxide layer, which forms spontaneously in air and resists attack from acids, alkalis, and seawater. This makes zirconium discs indispensable in chemical processing, where they serve as liners, baffles, or electrode substrates. The nuclear industry also relies on them for cladding and structural parts due to zirconium's low thermal neutron absorption cross-section.
Structure and Working Principle
Zirconium discs are solid, flat cylindrical pieces with thicknesses ranging from a few millimeters to several centimeters. Their functionality derives from zirconium's inherent material properties rather than moving parts. The discs work as passive barriers or substrates, leveraging zirconium's oxide layer to prevent corrosion or neutron-induced degradation. In nuclear applications, discs may feature precise dimensional tolerances (e.g., ±0.05 mm) to ensure proper fuel rod spacing. For chemical equipment, surfaces are often polished to a Ra <0.8 µm to minimize crevice corrosion. Some designs incorporate grooves or holes for mounting, but the discs generally maintain a simple geometry optimized for material performance.
Key Features
Corrosion resistance is the standout feature of zirconium discs, with performance surpassing titanium and stainless steel in hydrochloric acid environments. They withstand temperatures up to 400°C in oxidizing conditions and higher in reducing atmospheres. The material's biocompatibility allows for medical uses like dental implants without risk of adverse reactions. Zirconium discs exhibit excellent mechanical properties, with tensile strength ranging from 380 MPa (Zr702) to 550 MPa (Zr705). Their thermal conductivity (~22 W/m·K) and low coefficient of thermal expansion (~5.7×10⁻⁶/°C) ensure dimensional stability under thermal cycling. Electrically, zirconium acts as a conductor, making discs suitable for electrochemical applications.
Application Areas
In the chemical industry, zirconium discs serve as reactor liners, pump components, and heat exchanger parts, particularly where hydrochloric or sulfuric acid is present. Nuclear power plants use them as spacer discs in fuel assemblies and control rod guides due to their neutron transparency. The medical field employs polished zirconium discs for orthopedic and dental implants, capitalizing on their osseointegration capabilities. Aerospace applications include rocket engine components and fasteners where weight savings and high-temperature performance are critical. Emerging uses include photovoltaics (as sputtering targets) and hydrogen storage systems.
Maintenance and Precautions
Zirconium discs require minimal maintenance but should be inspected for surface oxide damage in corrosive environments. Cleaning should use non-chlorinated solvents (e.g., acetone) followed by deionized water rinsing to avoid chloride-induced stress corrosion cracking. Storage should be in dry, contaminant-free conditions. During handling, avoid iron or aluminum tool contact to prevent galvanic corrosion. Machining requires carbide tools and low-speed operations to prevent heat-induced embrittlement. Welding demands argon shielding to prevent oxygen/nitrogen contamination.
B2B Procurement Guide
When sourcing zirconium discs, specify the alloy grade (e.g., ASTM B550 Zr702 or B551 Zr705) and required certifications (ISO 9001, ASME NQA-1 for nuclear). Critical dimensions (diameter, thickness, flatness) should be defined with tolerances. Surface finish requirements (e.g., mill finish, polished, pickled) affect pricing and lead time. Suppliers should provide material test reports (MTRs) with chemical composition and mechanical properties. For large orders, consider dual sourcing due to zirconium's limited global production capacity. Lead times typically range from 4-12 weeks depending on alloy availability and machining complexity.
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