HfB2
ceramic· HfB2
Hafnium diboride (HfB₂) is an ultra-high-temperature ceramic compound combining hafnium and boron, belonging to the transition metal diboride family known for extreme thermal stability and hardness. It is employed in aerospace thermal protection systems, hypersonic vehicle leading edges, and rocket nozzles where materials must withstand temperatures exceeding 2000°C without significant degradation. Engineers select HfB₂ over alternatives like carbon-carbon composites or alumina because of its superior oxidation resistance, chemical inertness at extreme temperatures, and capacity to maintain structural integrity in reentry and propulsion environments where conventional ceramics fail.
hypersonic vehicle heat shieldsrocket nozzle linersreentry thermal protectionhigh-temperature structural componentsaerospace oxidation barriersextreme-environment crucibles
Compliance & Regulations
?Conflict Free?RoHS?REACH?TSCA?Prop 65
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Bulk Modulus(K)2 entries | 36,388.3 | ksi | — | ||
| ↳ | 36,842.5 | ksi | — | ||
Poisson's Ratio(ν) | 0.1400 | - | — | ||
Shear Modulus(G)2 entries | 35,140.4 | ksi | — | ||
| ↳ | 35,016.5 | ksi | — |
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) | 0.4014 | lb/in³ | — |
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Band Gap(Eg) | 0.000 | eV | — | ||
Magnetic Moment(μB) | 0.000 | µB | — | ||
Seebeck Coefficient(S) | -32.42 | µV/K | — |
Verified Unverified Low confidence (<80%) Link to source
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Energy Above Hull(ΔEhull) | 0.000 | eV/atom | — | ||
Formation Energy(ΔHf)2 entries | -1.136 | eV/atom | — | ||
| ↳ | -1.007 | 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.