Goodfellow Hot Pressed Boron Carbide B 4 C

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Goodfellow Hot Pressed Boron Carbide B₄C
Categories:	Ceramic; Carbide
Material Notes:	Hot pressed Boron Carbide is one of the hardest known materials. Its main applications make use of its excellent wear resistance and high strength. It has a low density but a high elastic modulus and high compressive strength, which leads to its use as a ballistic material. Boron Carbide has a high neutron capture cross section so it is used in neutron-absorbing applications, such as shielding. Boron carbide has good resistance to acids but not to alkali hydroxide melts. Information provided by Goodfellow.
Key Words:	B4C, REFEL F®
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Physical Properties	Original Value	Comments

Density	2.45 - 2.52 g/cc
Porosity	<= 3.0 %	Apparent

Mechanical Properties	Original Value	Comments
Knoop Microhardness	2800 - 3500	kg/mm²
Vickers Microhardness	3200	kg/mm²
Tensile Modulus	440 - 470 GPa
Compressive Strength	1400 - 3400 MPa

Electrical Properties	Original Value	Comments
Volume Resistivity	0.10 - 10 ohm-cm

Thermal Properties	Original Value	Comments
CTE, linear	5.60 µm/m-°C @Temperature 20.0 - 1000 °C
Specific Heat Capacity	0.950 J/g-°C @Temperature 20.0 °C
Thermal Conductivity	30.0 - 90.0 W/m-K @Temperature 25.0 °C
Melting Point	2450 °C
Maximum Service Temperature, Air	<= 800 °C

Descriptive Properties
Chemical Resistance - Alkalis	Fair
Chemical Resistance - Concentrated Acids	Fair
Chemical Resistance - Dilute Acids	Good
Chemical Resistance - Halogens	Fair
Chemical Resistance - Metals	Good

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CGOODF243 / 197406

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