Zirconium is a lustrous, silvery-grey transition metal with a wide range of physical properties that make it useful in various applications. Here are some key properties:
General:
* Symbol: Zr
* Atomic number: 40
* Atomic weight: 91.224 g/mol
* Density: 6.506 g/cm³ (at 20 °C)
* Melting point: 1855 °C (3371 °F)
* Boiling point: 4409 °C (7968 °F)
* Hardness: 5.0 on the Mohs scale
Mechanical:
* Tensile strength: 345 MPa (50,000 psi)
* Yield strength: 275 MPa (40,000 psi)
* Ductility: Good, can be easily worked and formed
* Elastic modulus: 96 GPa
* Thermal expansion coefficient: 5.8 x 10⁻⁶ / °C
Other Properties:
* Electrical conductivity: Good, similar to aluminum
* Thermal conductivity: 22.7 W/(m·K)
* Magnetic properties: Paramagnetic (weakly attracted to magnets)
* Corrosion resistance: Extremely high, particularly in acidic and alkaline environments
* Neutron absorption cross-section: Low, making it suitable for use in nuclear reactors
* Heat capacity: 25.36 J/(mol·K)
Noteworthy Features:
* Low neutron absorption: Zirconium is used in nuclear reactors because it absorbs very few neutrons, allowing the chain reaction to continue efficiently.
* Corrosion resistance: Zirconium's excellent corrosion resistance makes it ideal for applications in harsh environments, such as pipes, valves, and other components in chemical processing plants.
* Biocompatibility: Zirconium is biocompatible, meaning it can be safely used in medical implants and devices.
Key Applications:
* Nuclear reactors: Cladding for fuel rods
* Chemical processing: Pipes, valves, and other components
* Medical implants: Artificial joints, dental implants
* Electronics: Memory chips, capacitors
* Aerospace: Rocket engines, satellites
Overall, zirconium's unique combination of physical properties makes it a valuable material for various industries. Its high corrosion resistance, low neutron absorption, and biocompatibility contribute to its wide range of applications.
