Geoscience Reference
In-Depth Information
Figure 10.80 SEM fracture
surface of high-density
hydrothermal reaction sintered
Cr
2
O
3
[363]
.
Table 10.7 Selected Results of Hydrothermal Reaction Sintering of
Monoclinic ZrO
2
for 3 h
[362]
Sample
No.
H
2
O/
Zr
Degree
of Fill
(%)
Temperature
(
C)
Pressure
(MPa)
Bulk Density
(g/cm
3
)
Relative
Density
(%)
Average
Grain Size
(
μ
m)
99.0
a
3
1.773 19.3
1000
98
5.85
3
5
2.020 15.5
1000
98
5.51
93.2
1
29
2.063 14.8
1000
98
5.17
87.5
0.5
30
2.095 15.0
1000
98
5.38
89.2
0.5
10
2.415 18.4
1000
98
Not sintered
25
2.038 15.1
1000
196
5.51
93.2
0.3
28
1.985 15.1
1000
294
5.96
100.9
0.1
8
2.012 22.7
1000
490
5.83
98.7
3
7
2.010 20.4
1000
686
5.77
97.7
3
23
2.038 41.2
1000
686
5.70
96.4
32
2.016 14.8
1000
98
5.68
96.1
2
40
2.142 14.3
1100
98
Not sintered
41
2.089 14.2
1200
98
Not sintered
39
2.091 14.1
1000
490
Not sintered
0.5
a
With gray skin; gray fine body, rare case; capsule leaked slightly.
3h
[362]
. Yin et al.
[367]
have studied the low-temperature sintering and
mechanical properties of ceria and yttria co-doped zirconia crystallized in super-
critical methanol.
The preparation and processing of perovskite-type titanates is becoming
an attractive field owing to their unique electronic properties. However, their
electrical properties are closely linked to their microstructural features, such as
porosity and grain size
[368]
. These authors have prepared BaTiO
3
powders by
the hydrothermal synthesis technique and have fired via a fast sintering process
