Silicon Nitride vs ZrB2
Ceramic · grade comparison
Silicon Nitride and ZrB2 are both ceramic grades. Silicon Nitride is the stronger of the two: tensile strength 450 MPa (65.3 ksi) against 280 MPa (40.6 ksi) for ZrB2, about 61% more. ZrB2 is harder — 2,200 HV against 1,500 HV for Silicon Nitride — which matters for wear surfaces and threads. Silicon Nitride is lighter (3.22 g/cm³ vs 6.09 g/cm³ for ZrB2) and ZrB2 is stiffer (489 GPa vs 310 GPa).
Silicon NitrideChoose it when strength drives the design, or when weight is the constraint.
ZrB2Choose it when surface hardness matters.
Silicon Nitride vs ZrB2: 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)
Elongation at Break
Compressive Strength
Flexural Strength
Fracture Toughness (K_IC)
Hardness, Vickers
Hardness, Knoop
Same in both: Hardness, Mohs 9
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Light Transmission
Porosity
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Min Service Temperature
Same in both: Max Service Temperature (continuous) 1,200°C2,192 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Dielectric Strength
Dielectric Constant (1 MHz)
Dissipation Factor (1 MHz)
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.
Machinability
Polishability
Sintering / Firing Temperature
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: Typical Recycled Content 0%
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 Nitride | ZrB2 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Silicon Nitride vs ZrB2 — frequently asked
Is Silicon Nitride stronger than ZrB2?
Yes. Silicon Nitride has a typical tensile strength of 450 MPa (65.3 ksi) against 280 MPa (40.6 ksi) for ZrB2 — about 61% more.
Which is cheaper, Silicon Nitride or ZrB2?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
When should I choose Silicon Nitride over ZrB2?
Pick Silicon Nitride when strength drives the design, or when weight is the constraint. Pick ZrB2 when surface hardness matters.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Silicon Nitride and ZrB2 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.