HfB2 — Properties & Data | MatWorld

HfB2

Name: HfB2
Brand: MatWorld

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

Units:

si imperial

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Method

Property	Value	Unit	Conditions
Bulk Modulus(K)2 entries	250.9	GPa	DFT
↳	254.0	GPa	DFT · OptB88vdW
Poisson's Ratio(ν)	0.1400	-	DFT · OptB88vdW
Shear Modulus(G)2 entries	242.3	GPa	DFT
↳	241.4	GPa	DFT · OptB88vdW

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, or test environment.

Verified Unverified Low confidence (<80%) Link to source

Property	Value	Unit	Conditions	Source
Density(ρ)	11.11	kg/m³	DFT · OptB88vdW

Verified Unverified Low confidence (<80%) Link to source

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Method

Carrier

Property	Value	Unit	Conditions
Band Gap(Eg)2 entries	0.000	eV	DFT · OptB88vdW
↳	0.000	eV	DFT · TBmBJ
Magnetic Moment(μB)	0.000	µB	DFT · OptB88vdW
Thermoelectric Power Factor(PF)2 entries	0.00442	W/(m·K²)	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	0.00450	W/(m·K²)	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C
Seebeck Coefficient(S)2 entries	-32.42	μV/K	DFT · OptB88vdW · n-type · 1e20 cm⁻³ · 327°C
↳	-33.48	μV/K	DFT · OptB88vdW · p-type · 1e20 cm⁻³ · 327°C

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, or test environment.

Verified Unverified Low confidence (<80%) Link to source

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Method

Property	Value	Unit	Conditions
Energy Above Hull(ΔEhull)	0.000	eV/atom	DFT · OptB88vdW
Formation Energy(ΔHf)2 entries	-1.007	eV/atom	DFT · OptB88vdW
↳	-1.136	eV/atom	Measured

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, or test environment.

Verified Unverified Low confidence (<80%) Link to source

Reference data from cited sources. Not verified or certified by MatWorld Inc. Verify against the source before use in design. Terms: engineering data

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.

HfB2

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Regulatory Screening

Environmental