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Solder Alloy 702 vs. R30035 Cobalt

Solder alloy 702 belongs to the otherwise unclassified metals classification, while R30035 cobalt belongs to the cobalt alloys. There are 22 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is solder alloy 702 and the bottom bar is R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 51
220 to 230
Elongation at Break, % 21
9.0 to 46
Poisson's Ratio 0.36
0.29
Shear Modulus, GPa 19
84 to 89
Tensile Strength: Ultimate (UTS), MPa 53
900 to 1900

Thermal Properties

Latent Heat of Fusion, J/g 61
320
Melting Completion (Liquidus), °C 220
1440
Melting Onset (Solidus), °C 220
1320
Specific Heat Capacity, J/kg-K 220
440
Thermal Conductivity, W/m-K 62
11
Thermal Expansion, µm/m-K 22
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 15
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 18
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.4
8.7
Embodied Carbon, kg CO2/kg material 17
10
Embodied Energy, MJ/kg 290
140

Common Calculations

Stiffness to Weight: Axial, points 3.8
14 to 15
Stiffness to Weight: Bending, points 17
23 to 24
Strength to Weight: Axial, points 2.0
29 to 61
Strength to Weight: Bending, points 4.2
24 to 39
Thermal Diffusivity, mm2/s 38
3.0
Thermal Shock Resistance, points 3.4
23 to 46

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0
Antimony (Sb), % 0 to 0.1
0
Arsenic (As), % 0 to 0.030
0
Bismuth (Bi), % 0 to 0.1
0
Boron (B), % 0
0 to 0.015
Cadmium (Cd), % 0 to 0.0020
0
Carbon (C), % 0
0 to 0.025
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
29.1 to 39
Copper (Cu), % 0 to 0.050
0
Gold (Au), % 0 to 0.050
0
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
0 to 1.0
Lead (Pb), % 0 to 0.070
0
Manganese (Mn), % 0
0 to 0.15
Molybdenum (Mo), % 0
9.0 to 10.5
Nickel (Ni), % 0 to 0.010
33 to 37
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0
0 to 0.15
Silver (Ag), % 2.8 to 3.2
0
Sulfur (S), % 0
0 to 0.010
Tin (Sn), % 96.3 to 97.2
0
Titanium (Ti), % 0
0 to 1.0
Zinc (Zn), % 0 to 0.0010
0