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Properties and Nature of Our Zirconium Oxide, Specialty Refractory Products and Engineered Ceramics
Engineering solutions
for severe
industrial applications
Zircoa produces its own Zirconium Oxide. Our comprehensive understanding of this material and its use in the production of: other ceramics and refractories, opacifiers, electronics, sensors, abrasives, catalysts, ceramic color, high temperature filler and insulation, electronic ceramics wear resistant products and zirconium metal production, provides us the opportunity to answer some of the questions frequently asked during initial inquiries.
Following your review, we encourage you to visit our Products page, or contact a Zircoa product specialist to discuss your specific needs.
Properties of Our Zirconium Oxide (Zirconia)
Zirconium Oxide is one of the most versatile advanced ceramic materials commercially available today. It resists high temperatures, corrosion, wear and impact. It is chemically inert in the presence of most substances, even at elevated temperatures. Zirconium Oxide (zirconia) also has unique electrical properties including the ability to generate an electromotive force (EMF) in the presence of an oxygen differential.
Nature of Zircoa’s Specialty Refractory Products
Zircoa designs specialty refractory products to address severe industrial applications - especially where resistance to high temperature, corrosion, and erosion are required. Zircoa specialty refractories remain chemically inert at temperatures up to 1300°C and keep their structure even above 2400°C. Zircoa specialty refractory withstand temperature changes (thermal shock) as rapid as room temperature to 1540°C in 30 seconds. They resist erosion and spalling in the presence of caustic slag and harsh alloys; they endure repeated thermal cycles from room temperature to 1300°C.
Zircoa produces specialty refractories in a variety of compositions - all partially stabilized with either calcia or magnesia. The chart below (under Specifications) lists some typical properties of Zircoa specialty refractory products.
Typical Chemical Analysis
| Magnesia Stabilized Zirconia |
Calcia Stabilized Zirconia |
|
| Bulk Density | 4.6 g/cc | 4.3 g/cc |
| Apparent Porosity | 18% | 23% |
| Modulus of Rupture | 3000 psi | 3000 psi |
| Thermal Expansion (DL/L/°C)10-6  @ 600°C @ 1000°C @ 1300°C |
7.0 6.0 2.5 |
8.0 9.5 8.0 |
| Thermal Conductivity @ 800°C |
1.6 W/mK |
1.5 W/mK |
Nature of Zircoa’s Engineered Ceramics
Zircoa engineered (technical) ceramics meet the challenges of many industrial applications that cannot be addressed with metals or other advanced ceramics. Zircoa engineered ceramics resist wear and high impact. They withstand corrosive attack by molten metal, organic solvents, caustics, and acids. They endure prolonged exposure to elevated temperatures even under severe mechanical stress.
Zircoa engineered ceramics are manufactured in a variety of specialty compositions, including 1030 (Zycron® L) and 5027 (Zycron H). Their typical properties are listed below.
Physical Properties
| Property | Units | 1028 | (a) | 1876 | (b) |
| 1030 | 5027 | ||||
| Physical | |||||
| RT MOR-4Pt. Bend | psi | 70,000 | 80,000 | 65,000 | 50,000 |
| Mpa | 480 | 550 | 450 | 350 | |
| Fracture Toughness | MPa-m1/2 | 10.6 | 13 | 7.2 | 7.2 |
| Density | g/cm3 | 5.5 | 5.7 | 5.47 | 5.45 |
| Porosity | % | 0 | 0 | 0 | 0 |
| Crystal Size | micron | 100 | 100 | - - - | - - - |
| Monoclinic | % | - - - | - - - | - - - | 55 |
| Young‘s Modulus | psi x 106 | 29 | 29 | 35 | 32 |
| GPa | 200 | 200 | 240 | 220 | |
| Weibull Modulus |
|
12 | 12 | 10 | 14 |
| Hardness - Rockwell | "A" scale | 83 | 83 | 83 | 83 |
| - Vickers HV10 | GPa | 8.04 | 8.46 | - - - | 7.46 |
| kg/mm2 | 820 | 863 | - - - | 760 | |
| Thermal | |||||
| CTE-RT to 600°C | x10-6 per °C | 9.8 | 10 | 10.2 | 2.4 |
| CTE-RT to 1000°C | x10-6 per °C | 10.3 | 10.7 | 10.5 | 3.4 |
| CTE-RT to 1300°C | x10-6 per °C | 10.8 | 11.3 | 10.8 | 6.4 |
| T.C. @ 800°C (CALC) | W/m-°K | 1.88 | 1.99 | 1.87 | 1.86 |
| Specific Heat @ 300° C | cal/gm°C | - - - | - - - | 0.152 | 0.15 |
| Electrical | |||||
| Electrical Resistivity @ 28°C |
ohm-cm | >108 | 1011 | - - - | >108 |
| Electrical Resistivity @ 1000°C |
ohm-cm | 200 | 200 | - - - | 200 |
| Dielectric Constant |
- - - |
- - - | - - - | - - - | - - - |
| Dielectric Strength | volts/mil | - - - | - - - | - - - | - - - |
| Major Chemistry | |||||
| SiO2 | wt% | 0.1 | 0.1 | 0.14 | 0.1 |
| CaO | wt% | 0.2 | 0.2 | 0.2 | 0.2 |
| MgO | wt% | 3 | 3 | 3.15 | 3.3 |
| Fe2O3 | wt% | 0.1 | 0.1 | 0.1 | 0.1 |
| Al2O3 | wt% | 0.1 | 0.1 | 0.1 | 0.1 |
| TiO2 | wt% | 0.05 | 0.05 | 0.05 | 0.1 |