Niobium, Nb (Columbium, Cb); Wrought

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Niobium, Nb (Columbium, Cb); Wrought
Categories:	Metal; Nonferrous Metal; Niobium Alloy; Refractory Metal; Pure Element
Material Notes:	Wrought applies only to tensile and/or hardness values; other property values are typical of the element. The name niobium is used by chemists but the element is often called columbium by American metallurgists. Fabrication: good formability, work hardens slowly, cannot be soldered. Joining requires adhesives, rivets, nuts and bolts, or capacitive discharge welding. Applications: used in aerospace applications (i.e. rocket boosters), sodium vapor lamps, and superconductors.
Vendors:	PLANSEE SE: Whether it's high temperatures, aggressive chemicals or extreme mechanical loading: PLANSEE supplies a suitable product solution in refractory metals or composite materials. As the world market leader in powder metallurgically produced high performance materials we combine outstanding materials knowledge with profound applications and technology know-how. Visit us at www.plansee.com. Eagle Alloys Corporation is a leading supplier of quality metals and alloys. Our staff prides itself on working fast, efficiently and courteously to get you the information you need. Call (800) 237-9012 or visit www.EagleAlloys.com. Click here to view all available suppliers for this material. Please click here if you are a supplier and would like information on how to add your listing to this material.
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Physical Properties	Original Value	Comments

Density	8.60 g/cc

Chemical Properties	Original Value	Comments
Atomic Mass	92.90638	1995
Atomic Number	41
Thermal Neutron Cross Section	1.1 barns/atom
X-ray Absorption Edge	0.65291 Å	K
	4.59111 Å	L_I
	5.02472 Å	L_II
	5.22596 Å	L_III
Electrode Potential	-1.10 V
Electronegativity	1.6	Pauling
Ionic Radius	0.690 Å	Crystal Ionic Radius for Valence +5
	0.740 Å	Crystal Ionic Radius for Valence +4
	1.00 Å	Crystal Ionic Radius for Valence +1
Electrochemical Equivalent	0.45 g/A/h

Mechanical Properties	Original Value	Comments
Hardness, Brinell	152	Converted from Vickers for 3000 kg load/10 mm ball Brinell test.
Hardness, Knoop	175	Converted from Vickers.
Hardness, Rockwell B	81.7	Converted from Vickers.
Hardness, Vickers	160
Tensile Strength, Ultimate	585 MPa
Elongation at Break	5.0 %
Modulus of Elasticity	103 GPa
Poissons Ratio	0.38
Shear Modulus	37.5 GPa

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000151 ohm-cm
Magnetic Susceptibility	0.00000228	cgs/g
Critical Magnetic Field Strength, Oersted	2010 - 2110
Critical Superconducting Temperature	9.23 - 9.27 K

Thermal Properties	Original Value	Comments
Heat of Fusion	290 J/g
Heat of Vaporization	7704 J/g
CTE, linear	7.10 µm/m-°C @Temperature 20.0 - 100 °C
	7.38 µm/m-°C @Temperature 300 °C
	7.61 µm/m-°C @Temperature 500 °C
	8.52 µm/m-°C @Temperature 1000 °C
Specific Heat Capacity	0.272 J/g-°C
	0.3251 J/g-°C	Gas
Thermal Conductivity	52.3 W/m-K @Temperature 20.0 °C
	54.4 W/m-K @Temperature 100 °C
	56.5 W/m-K @Temperature 200 °C
	58.6 W/m-K @Temperature 300 °C
	60.7 W/m-K @Temperature 400 °C
	63.2 W/m-K @Temperature 500 °C
	65.3 W/m-K @Temperature 600 °C
Melting Point	2468 °C
Boiling Point	4744 °C
Heat of Formation	0.000 kJ/mol	Crystal
	725.9 kJ/mol	Gas

Optical Properties	Original Value	Comments
Emissivity (0-1)	0.39 @Temperature 2000 °C
	0.78 @Temperature 1350 °C

Component Elements Properties	Original Value	Comments
Niobium, Nb (Columbium, Cb)	100 %

References for this datasheet.

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