Si3N4
ceramic· Si3N4
Silicon nitride (Si₃N₄) is a high-performance structural ceramic composed of silicon and nitrogen, valued for its exceptional hardness, thermal stability, and resistance to thermal shock. It is widely used in automotive engines (turbocharger rotors, glow plugs), aerospace applications, cutting tools, and bearing components where superior wear resistance and high-temperature capability are required. Engineers select Si₃N₄ over traditional metals and alumina ceramics when demanding applications require a material that maintains strength at elevated temperatures while remaining lightweight, with particular advantage in environments involving thermal cycling or abrasive wear.
turbocharger rotorsceramic cutting toolsbearing componentsengine combustion chambersthermal shock resistance applicationsaerospace valve seats
Compliance & Regulations
?Conflict Free?RoHS?REACH?TSCA?Prop 65
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Bulk Modulus(K)3 entries | 234.4 | GPa | — | ||
| ↳ | 234.4 | GPa | — | ||
| ↳ | 165.7 | GPa | — | ||
Elastic Compliance Tensor(Sij) | Matrix (redacted) | 1/GPa | — | ||
Elastic Anisotropy(AU) | 0.3757 | - | — | ||
Elastic Stiffness Tensor(Cij) | Matrix (redacted) | Pa | — | ||
Poisson's Ratio(ν)2 entries | 0.2806 | - | — | ||
| ↳ | -0.5800 | - | — | ||
Shear Modulus(G)3 entries | 120.5 | GPa | — | ||
| ↳ | 120.5 | GPa | — | ||
| ↳ | 50.07 | GPa | — |
N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form / heat treatment / basis.
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Thermal Conductivity(k) | 30.00 | W/(m·K) | — |
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 3.090 | kg/m³ | — |
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Band Gap(Eg)2 entries | 5.100 | eV | — | ||
| ↳ | 1.431 | eV | — | ||
Dielectric Constant (Relative Permittivity)(εr)2 entries | 8.160 | - | — | ||
| ↳ | 8.191 | - | — | ||
Electronic Dielectric Tensor(ε∞) | Matrix (redacted) | - | — | ||
Total Dielectric Tensor(ε) | Matrix (redacted) | - | — | ||
Magnetic Moment(μB) | 0.000 | µB | — | ||
Piezoelectric Modulus(eij) | 0.1411 | C/m² | — | ||
Seebeck Coefficient(S) | -252.9 | µV/K | — |
N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form / heat treatment / basis.
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Energy Above Hull(ΔEhull) | 0.7422 | eV/atom | — | ||
Formation Energy(ΔHf)2 entries | -1.103 | eV/atom | — | ||
| ↳ | -0.4503 | eV/atom | — |
N entriesMultiple entries per property — large groups are collapsed; click a summary row to expand. Use filters above to narrow by form / heat treatment / basis.
Verified Unverified Low confidence (<80%) Link to source
Regulatory Screening
Environmental
RoHS, REACH, and Prop 65 statuses are validated against official substance lists (ECHA SVHC Candidate List, OEHHA Prop 65, RoHS Annex II). Other regulations are estimated from composition and material classification. All screening is a starting point for due diligence — always verify with your supplier before making compliance decisions.