Hafnium carbide (HfC) is an ultra-high-temperature ceramic compound combining hafnium metal with carbon in a face-centered cubic crystal structure. It is one of the highest-melting-point known materials and exhibits exceptional hardness, making it valuable for extreme thermal and mechanical environments. HfC is employed in aerospace thermal protection systems, rocket nozzles, cutting tools, and advanced refractory applications where conventional ceramics fail; it is also investigated for nuclear reactor components and hypersonic vehicle leading edges due to its resistance to oxidation and thermal shock at temperatures exceeding 3600 K.
Compliance & Regulations
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Bulk Modulus(K)3 entries | 236.2 | GPa | — | ||
| ↳ | 236.2 | GPa | — | ||
| ↳ | 161.9 | GPa | — | ||
Elastic Compliance Tensor(Sij) | Matrix (redacted) | 1/GPa | — | ||
Elastic Anisotropy(AU) | 0.02112 | - | — | ||
Elastic Stiffness Tensor(Cij) | Matrix (redacted) | Pa | — | ||
Poisson's Ratio(ν)2 entries | 0.1964 | - | — | ||
| ↳ | 0.4000 | - | — | ||
Shear Modulus(G)3 entries | 179.8 | GPa | — | ||
| ↳ | 179.8 | GPa | — | ||
| ↳ | 40.80 | GPa | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 9.918 | kg/m³ | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Band Gap(Eg)2 entries | 0.000 | eV | — | ||
| ↳ | 0.3750 | eV | — | ||
Dielectric Constant (Relative Permittivity)(εr) | 28.55 range 24.14–32.97median of 2 measurements | - | — | ||
Magnetic Moment(μB) | 0.000 | µB | — | ||
Seebeck Coefficient(S) | -289.7 | µV/K | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Energy Above Hull(ΔEhull) | 0.6396 | eV/atom | — | ||
Formation Energy(ΔHf)2 entries | -1.171 | eV/atom | — | ||
| ↳ | -0.4110 | eV/atom | — |