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Zirconia Machining and Grinding

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.

If we can be of assitance please contact us, we will be pleased to hear from you.
 

Zirconia Material Properties Data

  Trade Name ZTA   Trade Name YTZP (Sintered)
  Composition Zirconia-Toughened Alumina   Composition Yttria Partially Stabilized Zirconia
  Color White   Color Ivory
 
Properties Units Test ZTA
Value
YTZP (Sintered)
Value
Density gm/cc ASTM-C20 4.01 6.02
Crystal Size, average Microns Thin-Section 2 1
Water Absorption % ASTM-373 0 0
Gas Permeability -- -- 0 0
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)
Hardness
GPa(kg/mm2)
R45N
KNOOP 1000 gm
Rockwell 45 N
14.4 (1475)
85
12.7 (1300)
81
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, 25-1000° C 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
Impingement -- Note 4 0.41 0.20
Rubbing -- Note 4 0.49 0.20
 
 
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.
 

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