| Grade |
LOTEC |
ROICERAM |
CERABOREX |
UD-II |
| MC |
TC |
TM |
N600 |
N800 |
C400 |
SC |
SC-R |
CR |
35T |
50T |
| Material |
ß-Cordieriete |
Aluminum Titanate
|
Silicon Nitride
|
Silicon Carbide
|
Zirconium Diboride |
Boride Cermet |
2MgO· 2Al2O3· 5SiO2 |
Al2O3·TiO2 |
Si3N4 |
SiC |
SiC+Si |
Porous SiC |
ZrB2 |
MoB-Ni |
Bulk density
(Kg/m3) |
2,020 |
2,730 |
3,260 |
3,100 |
3,100 |
3,100 |
2,900 |
2,200 |
5,600 |
9,430 |
9,400 |
Bending strength
(MPa) |
R.T. |
18 |
10 |
17 |
650 |
800 |
500 |
250 |
100 |
340 |
2,100 |
2,400 |
| 800°C |
|
|
|
|
|
|
|
|
|
2,100 |
1,900 |
| 1000°C |
18 |
25 |
59 |
450 |
700 |
500 |
250 |
100 |
290 |
|
|
| 1200°C |
15 |
12 |
34 |
350 |
500 |
450 |
250 |
100 |
270 |
|
|
| 1400°C |
|
|
15 |
|
|
400 |
|
100 |
180 |
|
|
Compressive
strength
(MPa) |
R.T. |
100 |
80 |
180 |
1,800 |
1,800 |
1,900 |
1,000 |
|
|
|
|
| 1000°C |
80 |
150 |
340 |
|
|
|
|
|
|
|
|
Young's modulus
(MPa) |
R.T. |
22,000 |
4,000 |
6,000 |
294,000 |
294,000 |
392,000 |
314,000 |
147,000 |
451,000 |
343,000 |
304,000 |
| 1000°C |
19,000 |
20,000 |
25,000 |
|
|
|
|
|
|
|
|
| Fracture toughness |
(MPa·m1/2) |
|
|
|
5.3 |
5.5 |
4.5 |
3.0 |
|
4.1 |
17.5 |
30.0 |
| Poisson's ratio |
|
|
|
0.25 |
0.25 |
0.15 |
|
|
|
|
|
Vicker's hardness
(MPa) |
R.T |
|
|
|
14,000 |
14,000 |
23,000 |
|
|
16,000 |
10,000 |
7,000 |
| 800°C |
|
|
|
|
|
|
|
|
|
8,000 |
4,000 |
Friction factor
(ceramics to ceramics) |
R.T |
|
|
|
0.6 |
0.6 |
0.7 |
|
|
|
|
|
Thermal expansion
coefficient
(x10-6/K) |
R.T - 600°C |
1.5 |
-0.5 |
-0.8 |
3.4 |
3.4 |
4.5 |
4.0 |
4.0 |
6.2 |
8.7 |
8.9 |
| R.T - 1000°C |
1.8 |
0.8 |
0.5 |
|
|
|
|
|
|
|
|
| R.T - 1200°C |
1.8 |
|
|
|
|
|
|
|
|
|
|
Thermal conductivity
(W/m·K) |
R.T |
1.9 |
0.9 |
1.2 |
19 |
20 |
130 |
150 |
100 |
57 |
13 |
13 |
| 400°C |
1.5 |
0.9 |
1.2 |
|
|
|
|
|
|
|
|
| 800°C |
1.5 |
1.2 |
1.5 |
12 |
12 |
68 |
|
|
30 |
|
|
| 1200°C |
1.7 |
2.1 |
2.6 |
|
|
|
|
|
|
|
|
| Thermal spalling resistance |
(K) |
1,000 |
|
|
750 |
800 |
500 |
450 |
300 |
200 |
800 |
1,000 |
Electorical resistivity
(ohm.cm) |
R.T |
|
|
|
>1012 |
>1012 |
102 - 105 |
10-1 |
10 - 102 |
10-5 |
8.6x
10-5 |
8.5x
10-5 |
Weight increase by oxidation
in air
(mg/cm2) |
|
|
|
|
(a)
0.4 |
(a)
0.4 |
(b)
0.4 |
(a)
0.1 |
|
(b)
4.0 |
(c)
<0.1 |
(c)
<0.1 |
|
(a)at 1200°C *24h, (b) at1400°C *24h, (c) 800°C
*1h
|
 |
