Item

Al2O3

SiC

B4C

Density

3.5g/cm3

3.1g/cm3

2.4-2.65g/cm3

Hardness

HV1650

HV2750

HV3300

Flexural strength

290 Mpa

380 Mpa

400-650 Mpa

Compressive strength

850 Mpa

3970 Mpa

4100 Mpa

Fracture toughness

4.8 Mpa.m1/2

4.0 Mpa.m1/2

4.5-7.0 Mpa.m1/2

Thermal Conductivity

20 m0k

120m0k

29 m0k

Density:          2.40-2.65 g/cm3

Elastic modulus:   510 Gpa

Knoop Hardness:  3300

Flexural strength:  400-650 Mpa

Compressive strength: 4100 Mpa

Fracture toughness:   4.5-7.0 Mpa.m1/2

Coefficient of thermal expansion: 4.5x106

Thermal Conductivity: 29 m0k

Maximum permissible service temperature in air: 1500℃