All data is for information only------(Home)
PRODUCT DATA of Beryllium
MaterialBeryllium
PrecautionsBeryllium and its compounds are toxic
Chemical Composition100Be
CAS Registry ID7440-41-7
EXPERIENCE IN PRACTICE
Development StatusCommercial Product
Equivalent DesignationsBe
Space ExperienceGood
PHYSICAL PROPERTIES
Atomic Number4
Atomic Weight9.01 amu
Crystal StructureHexagonal close packed (hcp)
Specific Gravity1.79 to 1.86
Magnetic PropertiesNonmagnetic
ELASTIC PROPERTIES
Tensile Modulus304 to 306 GPa
Shear Modulus131 to 148 GPa
Remark: by torsion samples unetched prior to test
Bulk Modulus130 GPa
Poisson Ratio0.024 to 0.028
Speed of Sound (longitudinal)12900 m/s
Speed of Sound (transverse)8880 m/s
Acoustic Impedance24.1 MRayls
ELECTRICAL PROPERTIES
Electrical Volume Resistivity3.8e-8 ohm.m
Superconductivity Critical Temperature-273 °C
THERMAL PROPERTIES
Thermal Conductivity190 W/m.K
Thermal Expansion Coefficient11.5 μstrain/°C
Melting Range1320 °C
Specific Heat1.76 J/g.K
RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY
Atmospheric CorrosionAppears to be equal to 18-8 stainless steel
EMF vs SCE-0.97 V
Remark: Measured in 3.5% NaCl solution
Data Quality: Design Data
MachinabilityBeryllium is unusually prone to surface damage during machining. Generalized cracking may occur beneath the machined surface to several times the depth of the cut. Beryllium cannot be rolled or drawn to any degree at RT.
Weldinghelium-shielding and pressure welding is possible
BrazingFurnaze brazing in argon atmosphere is possible
SolderingAfter plating with copper beryllium may be soldered in the normal manner.
PlatingTo obtain an adherent, electroplating, it is necessary to etch or the zincate the parts
SPECIAL RECOMMENDATIONS
Special RecommendationsTo remove surface layer to a depth of 7.5um to 15um: Electrolytic: Methyl alcohol:10% HNO3: 2.5%NaF=3:1:1 for 15 min at 2.5A Chemical: 7%Cr2O3+85%H3PO4+5% H2SO4 for 5 to 10 min at 100C