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Pressure Sintered (Hot Pressed) Boron Carbide

Hot pressed boron carbide is boron carbide in the hot isostatic pressed (HIP) condition. The graph bars on the material properties cards below compare hot pressed boron carbide to other non-oxide engineering ceramics (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Compressive (Crushing) Strength

2200 MPa 320 x 103 psi

Elastic (Young's, Tensile) Modulus

460 GPa 67 x 106 psi

Flexural Strength

410 MPa 59 x 103 psi

Fracture Toughness

2.5 MPa-m1/2 2.3 x 103 psi-in1/2

Knoop Hardness


Poisson's Ratio


Tensile Strength: Ultimate (UTS)

350 MPa 51 x 103 psi

Thermal Properties

Maximum Temperature: Mechanical

2000 °C 3630 °F

Specific Heat Capacity

950 J/kg-K 0.23 BTU/lb-°F

Thermal Conductivity

90 W/m-K 52 BTU/h-ft-°F

Thermal Expansion

5.6 µm/m-K

Other Material Properties


2.5 g/cm3 160 lb/ft3

Dielectric Constant (Relative Permittivity) At 1 MHz


Electrical Resistivity Order of Magnitude

0 10x Ω-m

Common Calculations

Stiffness to Weight: Axial

100 points

Stiffness to Weight: Bending

100 points

Strength to Weight: Axial

39 points

Strength to Weight: Bending

44 points

Thermal Diffusivity

38 mm2/s

Thermal Shock Resistance

9.7 points

Followup Questions

Further Reading

Handbook of Refractory Carbides and Nitrides: Properties, Characteristics, Processing and Applications, Hugh O. Pierson, 1996

Springer Handbook of Condensed Matter and Materials Data, W. Martienssen and H. Warlimont (editors), 2005

Sintering of Advanced Materials: Fundamentals and Processes, Zhigang Zak Fang (editor), 2010