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.

 

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

  • 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. The change in temperature where a sharp decrease in flexural strength is observed is listed as 'delta Tc'.
  • 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.