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Pressureless Sintered Silicon Carbide

Pressureless sintered silicon carbide is a grade of silicon carbide. It has the lowest strength compared to the other variants of silicon carbide. The graph bars on the material properties cards below compare pressureless sintered silicon 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

3680 MPa 530 x 103 psi

Elastic (Young's, Tensile) Modulus

420 GPa 61 x 106 psi

Flexural Strength

480 MPa 70 x 103 psi

Fracture Toughness

3.9 MPa-m1/2 3.5 x 103 psi-in1/2

Knoop Hardness


Poisson's Ratio


Tensile Strength: Ultimate (UTS)

210 MPa 30 x 103 psi

Thermal Properties

Maximum Temperature: Mechanical

1590 °C 2900 °F

Maximum Thermal Shock

300 °C 570 °F

Specific Heat Capacity

740 J/kg-K 0.18 BTU/lb-°F

Thermal Conductivity

120 W/m-K 71 BTU/h-ft-°F

Thermal Expansion

4.4 µm/m-K

Vicat Softening Temperature

300 °C 570 °F

Other Material Properties


3.1 g/cm3 200 lb/ft3

Electrical Resistivity Order of Magnitude

2.6 10x Ω-m

Common Calculations

Stiffness to Weight: Axial

74 points

Stiffness to Weight: Bending

80 points

Strength to Weight: Axial

19 points

Strength to Weight: Bending

25 points

Thermal Diffusivity

53 mm2/s

Thermal Shock Resistance

8.3 points

Followup Questions

Further Reading

Properties of Silicon Carbide, Gary L. Harris (editor), 1995

Silicon Carbine Ceramics: Fundamental and Solid Reaction, Shigeyuki Somiya and Yoshizo Inomata (editors), 1991

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

Ceramics and Composites: Processing Methods, Narottam P. Bansal and Aldo R. Boccaccini (editors), 2012

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