Uranium Molybdenum alloys
Jul 1, 2017 3:33:11 GMT
The Astronomer, captinjoehenry, and 1 more like this

### Post by someusername6 on Jul 1, 2017 3:33:11 GMT

The limiting factor on fusion boosting on my nukes tends to be the yield strength of the nuclear material. Turns out you can improve it quite a bit if you add *just a little bit* of Molybdenum (2% by weight).

Composition, yield strength, and ultimate tensile strength are updated from the source (a patent citing this as prior art, www.google.ch/patents/US5273711, page 6, table 1). Remaining properties are copied from the base materials -- as I assume 2% Mo is sufficiently little to not affect them much.

Higher tensile strength and almost no change in radioactive content means you get to use more fusion fuel on your nukes -- use a larger hollow core radius, a smaller inner explosive width, some reflector with yield strength of at least 1447 MPa, and you will probably improve on size, mass, and cost.

Composition, yield strength, and ultimate tensile strength are updated from the source (a patent citing this as prior art, www.google.ch/patents/US5273711, page 6, table 1). Remaining properties are copied from the base materials -- as I assume 2% Mo is sufficiently little to not affect them much.

Higher tensile strength and almost no change in radioactive content means you get to use more fusion fuel on your nukes -- use a larger hollow core radius, a smaller inner explosive width, some reflector with yield strength of at least 1447 MPa, and you will probably improve on size, mass, and cost.

`Material U-233 2% Molybdenum`

Elements U-233 Mo

ElementCount 0.953 0.047

Density_kg__m3 19100

YieldStrength_MPa 1447

UltimateTensileStrength_MPa 1585

YoungsModulus_GPa 170

ShearModulus_GPa 111

SpecificHeat_J__kg_K 115

MeltingPoint_K 1405.3

BoilingPoint_K 4111

ThermalConductivity_W__m_K 27.5

ThermalExpansion__K 13.9e-6

Resistivity_Ohm_m .28e-6

RelativePermeability 1.00040

RefractiveIndex Uranium Oxide

RoughnessCoefficient .65

Material U-235 2% Molybdenum

Elements U-235 Mo

ElementCount 0.953 0.047

Density_kg__m3 19278

YieldStrength_MPa 1447

UltimateTensileStrength_MPa 1585

YoungsModulus_GPa 170

ShearModulus_GPa 111

SpecificHeat_J__kg_K 115

MeltingPoint_K 1405.3

BoilingPoint_K 4111

ThermalConductivity_W__m_K 27.5

ThermalExpansion__K 13.9e-6

Resistivity_Ohm_m .28e-6

RelativePermeability 1.00040

RefractiveIndex Uranium Oxide

RoughnessCoefficient .65

Material Depleted Uranium 2% Molybdenum

Elements U-238 U-235 Mo

ElementCount 0.950 0.003 0.047

Density_kg__m3 19100

YieldStrength_MPa 1447

UltimateTensileStrength_MPa 1585

YoungsModulus_GPa 170

ShearModulus_GPa 111

SpecificHeat_J__kg_K 115

MeltingPoint_K 1405.3

BoilingPoint_K 4111

ThermalConductivity_W__m_K 27.5

ThermalExpansion__K 13.9e-6

Resistivity_Ohm_m .28e-6

RelativePermeability 1.00040

RefractiveIndex Uranium Oxide

RoughnessCoefficient .65