Hf2Si is a hafnium silicide ceramic compound belonging to the refractory ceramic family, characterized by high melting point and significant stiffness. This material is explored primarily in high-temperature structural applications where thermal stability and mechanical rigidity are critical, particularly in aerospace and advanced propulsion systems where it serves as a candidate for thermal protection, engine components, and extreme-environment structural applications. Hafnium silicides are valued over other refractory ceramics for their combination of oxidation resistance and thermal conductivity, making them attractive for next-generation hypersonic vehicle systems and nuclear reactor components, though industrial adoption remains limited compared to established alternatives like SiC or alumina.
Compliance & Regulations
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Bulk Modulus(K)3 entries | 20,460.7 | ksi | — | ||
| ↳ | 20,460.7 | ksi | — | ||
| ↳ | 20,662.1 | ksi | — | ||
Elastic Compliance Tensor(Sij) | Matrix (redacted) | 1/GPa | — | ||
Elastic Anisotropy(AU) | 0.09622 | - | — | ||
Elastic Stiffness Tensor(Cij) | Matrix (redacted) | ksi | — | ||
Poisson's Ratio(ν)2 entries | 0.2141 | - | — | ||
| ↳ | 0.2300 | - | — | ||
Shear Modulus(G)3 entries | 14,456.7 | ksi | — | ||
| ↳ | 14,456.7 | ksi | — | ||
| ↳ | 13,901.9 | ksi | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 0.4117 | lb/in³ | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Band Gap(Eg)2 entries | 0.000 | eV | — | ||
| ↳ | 0.000 | eV | — | ||
Magnetic Moment(μB) | 0.000 | µB | — | ||
Seebeck Coefficient(S) | 7.907 | µV/K | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Energy Above Hull(ΔEhull) | 0.000 | eV/atom | — | ||
Formation Energy(ΔHf) | -0.6806 | eV/atom | — |