Silicon Carbide vs WC-Co
Ceramic · grade comparison
Silicon Carbide and WC-Co are both ceramic grades. WC-Co is the stronger of the two: tensile strength 1,500 MPa (218 ksi) against 250 MPa (36.3 ksi) for Silicon Carbide, about 6.0 times as much. Silicon Carbide is harder — 2,500 HV against 1,600 HV for WC-Co — which matters for wear surfaces and threads. Silicon Carbide is lighter (3.15 g/cm³ vs 14.9 g/cm³ for WC-Co) and WC-Co is stiffer (630 GPa vs 410 GPa).
Silicon CarbideChoose it when surface hardness matters, or when weight is the constraint.
WC-CoChoose it when strength drives the design.
Silicon Carbide vs WC-Co: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all ceramic grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all ceramic grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Shear Modulus
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Compressive Strength
Flexural Strength
Fracture Toughness (K_IC)
Hardness, Vickers
Hardness, Knoop
Hardness, Mohs
Elongation at Break
Shear Strength
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Refractive Index
Porosity
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Same in both: Min Service Temperature -200°C-328 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Volume Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Polishability
Sintering / Firing Temperature
Same in both: Machinability 3 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Thermal Diffusivity
Thermal Shock Resistance Index
Strength versus weight
Yield strength against density for every ceramic grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | Silicon Carbide | WC-Co |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Silicon Carbide vs WC-Co — frequently asked
Is WC-Co stronger than Silicon Carbide?
Yes. WC-Co has a typical tensile strength of 1,500 MPa (218 ksi) against 250 MPa (36.3 ksi) for Silicon Carbide — about 6.0 times as much.
Which is cheaper, Silicon Carbide or WC-Co?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
When should I choose Silicon Carbide over WC-Co?
Pick Silicon Carbide when surface hardness matters, or when weight is the constraint. Pick WC-Co when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Silicon Carbide and WC-Co side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.