Page 160 - Mechanical Behavior of Materials

Section 4.7 Hardness Tests 161

α = 136°
A d
h

A

Section A-A

Figure 4.32 Vickers hardness indentation.

Table 4.7 Vickers Hardness and Bending Strength for Some
Ceramics and Glasses
Hardness Bend Strength Elastic Modulus
3
Material HV , 0.1 kg MPa (ksi) GPa (10 ksi)
Soda-lime glass 600 65 74
(9.4) (10.7)
Fused silica glass 650 70 70
(10.1) (10.1)
Aluminous porcelain ≈ 800 120 120
(17.4) (17.4)
Silicon nitride 1700 600 400
Si 3 N 4 , hot pressed (87) (58)
Alumina, Al 2 O 3 1750 400 400
99.5% dense (58) (58)
Silicon carbide 2600 600 400
SiC, hot pressed (87) (58)
Boron carbide, B 4 C 3200 400 475
hot pressed (58) (69)
Source: Data in [Creyke 82] p. 38.