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Materials Properties Standard 990 for alumina and zirconia

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.

DESCRIPTION

ALUMINA

ZIRCONIA

Properties

Units

Test

99.5 %

99.6

99.8

ZTA

PSZ

FSZ

Density
g.cc-1 ASTM C20 3.8 3.9 3.9 4.0 5.7 6.0
Colour
** ** WHITE IVORY IVORY WHITE IVORY WHITE
Elastic Modulus GPa ASTM C848 350 370 350 360 200 200
Flexural Strength MPa ASTM F417 375 379 360 450 620 900
Compressive Strength MPa ASTM C773 2500 2600 2400 2900 1750 2500
Fracture Toughness Range Mpam0.5 NOTCHED BEAM 4-5 4-5 4-5 5-6 11 13
Hardness GPa ROCKWELL 45N

KNOOP 1000g

82

13.7

83

14.1

83

14.1

85

14.4

77

12

83

12.7

Thermal Conductivity W/mK ASTM C408 27.5 30 30 27 2.2 2.2
CTE 25-1000
10-6/0C ASTM C372 8.2 8.2 8.2 8.2 10.1 10.3
Thermal Shock delta Tc NOTE3 200 200 200 300 350 350
Dielectric Strength ac-kv/mm (6.25mm) ASTM D116 8.7 8.7 8.7 9.0 9.4 9.0
Dielectric Loss 250C@
1MHz
ASTM D2520 0.0002 0.0001 0.001 0.0005 0.001 0.001
Volume Resistivity 250C

5000C

10000C ohm-cm

ASTM D1829 >1014

2x1010

2x106

>1014

2x1010

2x106

>1014

2x1010

5x107

>1014

109

106

>1013

5x104

<102

>1013

1x103

<101

NOTES
1. DATA MEASUREMENTS - All data measurements are typical and made at room temperature unless otherwise noted.
3. THERMAL SHOCK RESISTANCE - Tests 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'.
4. CHEMICAL RESISTANCE - Although all alumina and zirconia ceramics are highly resistant to chemical attack, it is recommended that specific applications are discussed with Almath Crucibles to ensure optimum ceramic selection.