|
|
|
| Property |
Rhenium |
Molybdenum |
Tungsten |
| Atomic Number |
75 |
42 |
74 |
| Atomic Weight |
186.21 |
95.94 |
183.85 |
| Electron Shells |
2,13,32,18,8,2 |
|
|
Electrical
and Magnetic Properties
|
Re |
Mo-47.5Re
|
W-3
Re
|
W-
5 Re |
W-25
Re |
Temperature transition to
Superconductivity, °C
|
-271.3
|
-262.1
|
-
|
-
|
-268.8 |
Electronic work function,
eV
|
4.8-5.1
|
4.4
|
-
|
-
|
4.65 |
Temperature @ 20-1000°C
|
3.1-3.9
|
1.7
|
4.1
|
3.2
|
1.15 |
Coefficient of @ 20-100°C
|
4.9
|
- |
3.6
|
2.95
|
- |
Electrical @ 900-1500°C
|
- |
7.15
|
- |
- |
- |
resistivity x13-3 °C-1
|
- |
- |
- |
- |
- |
| Mechanical
Properties |
Re |
Mo-47.5Re
|
W-3
Re
|
W-
5 Re |
W-25
Re |
Density @ 20°C
|
21.04
|
13.52
|
370 |
|
19.7 |
Young's modulus Gpa
|
430-510
|
300-370
|
403
|
411
|
410 |
Shear Modulus, Gpa
|
176-1779
|
1320-137
|
-
|
-
|
159 |
Poissons ratio
|
.49-.296
|
0.285
|
-
|
0.3
|
0.29 |
| Tensile Strength
@20°C Mpa |
deformed
|
1800-2400
|
2450-3900
|
-
|
-
|
2750-4900 |
annealed
|
700-1300
|
980-1180
|
-
|
-
|
1370 |
| Elongation @
20°C, % |
deformed
|
1-3
|
1.5-3
|
-
|
-
|
1-2 |
annealed
|
10-25
|
20-25
|
-
|
-
|
20 |
Tensile Strength @1500°C
MPa
|
360
|
147
|
-
|
-
|
330 |
| Tensile Strength @1800°C
MPa |
200
|
59
|
-
|
-
|
196 |
Impact Strength , Mpa
|
- |
2.45
|
-
|
-
|
1.76 |
| Physical and Chemical Properties |
Re |
Mo 48/Re |
W 3/5% Re
|
W 25/ Re
|
| Density at 20° C :g/cm3 |
21.04 |
13.52 |
19.4 |
19.7 |
| Melting point (°C) |
3180 |
2550 |
3410/ 3350 |
3120/ 3130 |
| Crystal lattice |
HCP |
BCC |
BCC |
BCC |
| Electrical resistivity, m at 20°C |
0.193 |
0.220 |
0.0914/ 0.1166 |
0.2749/ 0.2832 |
Temperature coefficient of electrical
resistivity, at 20° C |
- |
- |
0.0041/ 0.0032 |
0.00115 |
| Elastic modulus in tension, GPa |
460 |
373 |
403/ 405 |
430 |
| Thermal
Properties |
Re |
Mo-47.5Re
|
W-3
Re
|
W-
5 Re
|
W-25
Re |
Ductile-brittle
trnasition Temperature (DBTT) , °C
|
does not exist
|
|
|
|
|
Stress
relieving temperature (SR ), °C
|
900-1200
|
1000-1200
|
-
|
-
|
1200 -
1400 |
| Recrystallization
temperature |
(SR ),
°C insipient
|
|
1300-1350
|
1400
|
1400
|
1600-1800 |
(SR ),
°C complete
|
|
1400-1600
|
1525
|
1525
|
1625-1850 |
| Selected Physical
Properties of RHENIUM |
Atomic Number
|
75 |
| Atomic weight |
186.2 |
| Atomic volume, m3/g-atom |
8.9x10-6 |
| Atomic radius, nm |
0.137 |
| Bonding radius, nm |
0.128 |
| Valences |
-1,4 and 7 |
| Minimum interatomic distance,nm |
0.274 |
| Thermal neutron absorption
cross section, b |
85 |
| Boiling point, °C |
~5627 |
| Melting point, °C |
~3180 |
| Common isotopes, % abundance |
Re185 (37.02) |
| |
Re185 (62.93) |
| Oxidizing temperature, °C |
>160 |
|
|
