While the same design features common to alumina ceramics; blind holes, threads etc. are easily produced in Zirconia the grinding time required is about fifty percent more. The post-grinding surface finish is significantly better than a comparable feature in most aluminas.
Zirconia is much more dense, finer grain and stronger than alumina ceramic. The combination of these physical properties make Zirconia an excellent material choice when strength and wear resistance are required.
Zirconium Oxide ceramic has unique physical and chemical properties as you will see in the properties data sheet below.
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Zirconia Material Properties Data
|Properties||Units||Test||ZTA Value||YTZP (Sintered) Value|
|Crystal Size, average||Microns||Thin-Section||2||1|
|Flexural Strength (MOR), 20° C||MPa (psi x 103)||ASTM-F417||450 (65)||1240 (180)|
|Elastic Modulus, 20° C||GPa (psi x 106)||ASTM-C848||360 (52)||210 (30)|
|Poisson's Ratio, 20° C||--||ASTM-C848||0.23||0.23|
|Compressive Strength, 20° C||MPa(psi x 103)||ASTM-C773||2900 (421)||2500 (363)|
|KNOOP 1000 gm|
Rockwell 45 N
|Tensile Strength, 25° C||MPa (psi x 103)||ACMA TEST #4||290 (42)||--|
|Fracture Toughness K(I c)||Mpa m1/2||NOTCHED BEAM||5 - 6||13|
|Thermal Conductivity, 20° C||W/m K||ASTM-C408||27.0||2.2|
|Coefficient of Thermal Expansion, |
|1 x 10-6/ °C||ASTM-C372||8.3||10.3|
|Specific Heat, 100° C||J/kg*K||ASTM-E1269||885||400|
|Thermal Shock Resistance, Δ Tc||°C||NOTE 3||300||350|
|Maximum Use Temperature||°C||NO-LOAD COND.||1500||1500|
|Dielectric Strength, 6.35mm||ac-kV/mm (acV/mil)||ASTM-D116||9.0 (228)||9.0 (228)|
|Dielectric Constant, 1MHz||25° C||ASTM-D150||10.6||29.0|
|Dielectric Loss (tan delta) 1MHz||25° C||ASTM-D150||0.0005||0.001|
|Volume Resistivity 25° C||ohm-cm||ASTM-D1829||> 1014||> 1013|
|Volume Resistivity 500° C||ohm-cm||ASTM-D1829||2 x 109||2 x 104|
|Volume Resistivity 1000° C||ohm-cm||ASTM-D1829||3 x 106||< 103|
Note 1: Data Measurements — All data measurements are typical and made at room temperature unless otherwise noted.
Note 2: Composition Control — All CoorsTek ceramic compositions are controlled using modern chemical spectrographic and x-ray fluorescent methods.
Note 3: Thermal shock resistance — Test are run by quenching samples into water from various elevated temperatures. The change in temperature where a sharp decrease in flexural strength is observed is listed as (delta)Tc.
Note 4: Wear resistance — Impingement tests are run by using a dry 240 grit fused alumina abrasive. The indices in the chart are calculated by dividing the material volume loss by the volume loss of an AD-85 alumina control. The lower in the index, the better the wear resistance.