Biomedical Engineering Reference
In-Depth Information
Table 3.2
Mechanical parameters and surface roughness of enamel and TC4
Tensile
strength (GPa)
Elastic
modulus (GPa)
Hardness
(HV
50
)
Roughness
(
Specimen
Poisson ratio
μ
m)
Enamel
0.06
94
0.28
360
0.20
TC4
0. 62
113
0.30
350
0.40
Source
: From Zheng and Zhou [
35
]
Fig. 3.9
Variation in the
friction coeffi cient with
cycles subjected to 5,000
cycles [
35
]
Fig. 3.10
LCSM micrographs of enamel wear scars subjected to different cycles [
35
]: (
a
) 10
cycles; (
b
) 100 cycles; (
c
) 1,000 cycles; (
d
) 2,000 cycles; (
e
) 5,000 cycles
Typical wear profi les (near the center of the wear scar and perpendicular to the
sliding direction) and wear depths of enamel specimens subjected to different cycles
are shown in Fig.
3.13
. Before profi le measuring, the worn surfaces were fi rst
immersed in distilled water for 7 days and then were cleaned with alcohol. A SEM
examination was also made on the cleaned worn surfaces of enamel, as shown in
Fig.
3.14
.
