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⇤ ← Revision 1 as of 2016-02-19 23:02:58
Size: 2252
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Size: 2252
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 13: | Line 13: |
| || Thickness t μm, 5m² /kg || 74.1 || 24.7 || || ||<-4> Derived || |
||<-4> Derived 5m²/kg || || Thickness t μm || 74.1 || 24.7 || || |
Maraging Steel Thinsat Substrates
The current thinsat design presumes a pure aluminum substrate. However, maraging steel (68% iron, 18% nickel, 8% cobalt, 5% molybdenum, other elements ) offers interesting advantages.
|
Aluminum |
Maraging Steel |
goodness |
density ρ kg/m³ |
2700 |
8100 |
|
rms. atomic number |
13 |
27.2 |
2.09 |
avg. atomic weight |
26 |
58.6 |
2.25 |
resistivity nΩ-m |
28.2 |
181 |
0.156 |
thermal conductance W/m-K |
237 |
24.8 |
0.105 |
thermal expansion μm/m-K |
23.1e-6 |
10.3e-6 |
2.24 |
Youngs modulus E, GPa |
70 |
210 |
3.0 |
Derived 5m²/kg |
|||
Thickness t μm |
74.1 |
24.7 |
|
Bending Stiffness E t³ |
28.4e-3 |
3.16e-4 |
0.111 |
Resistance mΩ/□ |
0.38 |
7.32 |
0.019 |
Thermal conduction mW/K |
17.6 |
0.63 |
0.036 |
http://www.matweb.com/search/DataSheet.aspx?MatGUID=adaadfebfb20417db13ce8d3683dbccc&ckck=1
The main advantages are launch stack density, thermal expansion, belt particle scattering, and magnetic properties. The main disadvantages are lower lateral thermal conduction and bending stiffness - the resistivity is higher, but not that important.
If the thinsats are magnetized on their north-south axis, then the earth's magnetic field will keep them aligned rotationally. Also, it will help the thinsats separate out of the launch stack. However, if a thinsat rotates 180 degrees in relation to a near neighbor, they may stick together inseparably. Shape tweaks to make them rotationally assymetric can reduce this effect.
Rutherford scattering is enhanced by higher nuclear weight and charge. Belt remediation will be faster, with less lattice displacement damage. Calculations should be scalable.
This requires more study.