Technical data

Measurement

GCr15

9Cr18

Si3N4

ZrO2

Density

g/cm3

7.8

7.9

3.2

6

Coefficient of expansion

10-6/

11

17

3.2

10.5

Emodulus of elastcity

GPa

208

200

320

210

Poisson ratio

0.3

0.3

0.26

0.3

HV Hardness

800

700

1700

1300

Flexural strength

MPa

2400

2600

900

1000

Compressive strength

MPa

3500

2000

Kc Impact strength

Nm/cm2

20

25

7

11

Thermal conductivity

W/mk

30-40

15

3.5

2.5

specific resistivity

mm2/m

1

0.75

1018

1015

specific heat

450

450

800

400

MAX permissible service temperature

120

150

1000

800

anti-corrossion

none

weak

strong

strong

NO.of stress circle

10*106

10*106

50*106

50*106

Destroy model

peel off

peel off

peel off

peel off/break

Anti-magnetism

none

none

good

good

Dimension stability

not good

not good

good

good

Insulate properties

not good

not good

good

good