Zirconia

Salient Features:

• High temperature range
• Very High Mechanical Strength
• Excellent wear and abrasion resistance
• High Impact Resistance and Toughness
• Usable for many cycles at a high life time
• Very Low Thermal Conductivity
• Highly resistant to most acids
• Suitable for precious metals and alloys (except palladium)
• Inert material
• Wide range of geometries and dimensions possible

Other Information about Zirconia

Zirconia is not suitable for use in inductive heating and has a low thermal shock resistance. Slow heating and slow cooling is advisable. Slow ramp rate and cooling rate are highly recommended to minimize the thermal shock on crucibles. When increasing the temperature, special attention should be paid on two sensitive temperature periods: not exceeding 3°C/MIN during 100°C —300°C and 1050°C -1200°C. The rate can be faster in other temperature ranges, but it is recommended to be less than 5°C /MIN.

To take the crucible directly out of furnace at high temperature may cause crack. if possible, take it out when the temperature is under 100°C.

Zirconia crucibles should not be heated by torch or furnaces that cannot control temperature change rate. The uneven heating can cause crack.

Zerconia Applications

Zirconium Oxide Crucibles deliver cleaner melts at temperatures up to 1900°C and beyond. They are engineered for the melting of superalloys and precious metals and deliver heat-up and cool-down schedules that keep your foundry productive. They are widely used in:

Typical zirconia labware include:

MATERIAL PROPERTIES

Please note that the information set forth herein is offered for comparison only, and is not to be construed as absolute engineering data or constituting a warranty or representation for which we assume legal responsibility.

Composition

DATA MEASUREMENTS – All data measurements are typical and made at room temperature unless otherwise noted.

THERMAL SHOCK RESISTANCE – Tests are run by quenching samples into water from various elevated temperatures. Zirconia crucibles are sensitive to thermal shock. Try to warm up the furnace chamber slowly. So that the crucibles can be evenly heated to reduce the impact of thermal shock.

CHEMICAL RESISTANCE – Although all zirconia ceramics are highly resistant to chemical attack, it is recommended that specific applications are discussed with us to ensure optimum ceramic selection.