HfC
ceramic· HfC
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.
Rocket nozzle linersHypersonic thermal protectionUltra-hard cutting toolsRefractory crucibles and hearthsNuclear reactor componentsAerospace engine applications
Compliance & Regulations
?Conflict Free?RoHS?REACH?TSCA?Prop 65
| 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 | — |
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 | |
|---|---|---|---|---|---|
Density(ρ) | 9.918 | kg/m³ | — |
Verified Unverified Low confidence (<80%) Link to source
| 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 | — |
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) | 0.6396 | eV/atom | — | ||
Formation Energy(ΔHf)2 entries | -1.171 | eV/atom | — | ||
| ↳ | -0.4110 | 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.