| PROPERTY |
UNITS |
TEST |
AD94 |
AD995 |
AD998 |
AD999 |
|
Density |
gm/cc |
ASTM-C 20 |
3.7 |
3.93 |
3.92 |
3.96 |
| Crystal, Avg |
microns |
thin-section |
12 |
6 |
6 |
3 |
| Color |
* |
* |
White |
Ivory |
Ivory |
Ivory |
Flexural_Strength
(MOR), 20˚ |
MPa |
ASTM-F417 |
352 (51) |
400 (58) |
375 (54) |
552 (80) |
| Elastic Modulus, 20˚ |
GPa |
ASTM-C848 |
303 (44) |
370 (54) |
370 (54) |
386 (56) |
| Poisson's Ratio 20˚ |
* |
ASTM-C848 |
0.21 |
0.22 |
0.22 |
0.24 |
Compressive_Strength,
20˚ |
MPa |
ASTM-C773 |
2103 (305) |
2680 (390) |
2500 (363) |
3792 (550) |
Fracture
Toughness, Klc |
Mpa m^1/2 |
Notch Beam |
4 5 |
4 5 |
4 5 |
4 5 |
|
| PROPERTY |
UNITS |
TEST |
AD94 |
AD995 |
AD998 |
AD999 |
| Hardness |
GPa |
Rockwell 45N |
78 |
83 |
83 |
90 |
| Thermal_Conductivity, 20˚ |
W/m K |
ASTM-C408 |
22.4 |
30 |
30 |
36 |
| CTE, 25-1000˚ |
1X10^-6/_C |
ASTM-C372 |
8.2 |
8.2 |
8.2 |
8.4 |
Thermal Shock
Resist. |
C |
NOTE 3 |
250 |
200 |
200 |
200 |
| Maximum Use Temp. |
C |
NO-LOAD COND. |
1700 |
1750 |
1750 |
1900 |
| Volume Resistivity 25˚ |
Ohm-cm |
ASTM-D1829 |
>10^14 |
>10^14 |
>10^14 |
>10^14 |
| Volume Resist. 500˚ |
Ohm-cm |
ASTM-D1829 |
4 X 10^9 |
2 X 10^10 |
2 X 10^10 |
3.3 X 10^12 |
| Volume Resist. 1000˚ |
Ohm-cm |
ASTM-D1829 |
5 X 10^5 |
2 X 10^6 |
2 X 10^6 |
1.1 X 10^7 |
|