Overview
Zirconia (ZrO₂) high-temperature products are engineered ceramics prized for their ability to withstand extreme heat and mechanical stress. Stabilized with additives like yttria (Y₂O₃) or magnesia (MgO), they resist phase transitions and cracking at temperatures up to 2,400°C. These materials are critical in industries requiring durability under thermal cycling, such as aerospace and metallurgy. Unlike traditional ceramics, zirconia offers a unique combination of toughness and low thermal conductivity, making it ideal for applications like thermal barrier coatings in jet engines. Its biocompatibility also enables use in medical implants, such as hip replacements and dental crowns.
Physical and Chemical Properties
Zirconia exhibits a high melting point (2,715°C) and exceptional chemical inertness, resisting corrosion from acids, alkalis, and molten metals. Its cubic phase, stabilized at room temperature, prevents volume changes during heating/cooling cycles—a key advantage over other ceramics. The material’s fracture toughness (6–10 MPa·m¹/²) surpasses that of alumina, reducing brittleness. Thermal conductivity ranges from 2–3 W/m·K, significantly lower than metals, which helps insulate high-temperature systems. Electrical insulation properties remain stable up to 600°C, suiting it for sensors and fuel cells. Density (5.68 g/cm³) is higher than steel, but components are often lightweight due to precision engineering.
Main Applications
In aerospace, zirconia coatings protect turbine blades from heat and erosion, extending engine life by 30–50%. Industrial furnaces use zirconia crucibles and liners for melting reactive metals like titanium. The medical field leverages its biocompatibility for joint replacements and dental prosthetics, where wear resistance is critical. Electronics benefit from zirconia’s oxygen-ion conductivity in solid oxide fuel cells (SOFCs). Automotive sensors rely on its stability in exhaust systems. Emerging applications include 3D-printed ceramic components for customized high-temperature tools, where traditional manufacturing falls short.
Safety and Storage
While zirconia is non-toxic, fine powders require handling with NIOSH-approved respirators to prevent lung irritation. Processed parts pose minimal risk but should be inspected for microcracks under stress. Storage mandates dry conditions (humidity <40%) to avoid hydration, which can degrade sintered products. High-temperature operations necessitate gradual heating/cooling to prevent thermal shock. Waste disposal follows standard ceramic protocols; recycling is feasible for uncontaminated scraps. MSDS guidelines classify zirconia as non-hazardous, though machining dust should be collected via HEPA filtration.
B2B Procurement Guide
Buyers should prioritize suppliers offering phase-stabilized zirconia (e.g., 3Y-TZP for medical use) with certified purity (99.5%+). Key specs include grain size (<0.5 µm for high-strength parts) and density (>95% theoretical). Batch consistency is critical—request COAs with traceable lot numbers. Pricing varies by form: powders ($50–200/kg), sintered rods/blocks ($300–500/kg). MOQs typically start at 10 kg for custom grades. Lead times range from 2–8 weeks for specialized formulations. For thermal coatings, verify plasma-spray compatibility and bond strength (>50 MPa).
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