Hf5Si4

ceramic

· Hf5Si4

Hf5Si4 is a refractory ceramic compound belonging to the hafnium silicide family, characterized by a high melting point and ceramic bonding between hafnium and silicon elements. This material is primarily of research and developmental interest for ultra-high-temperature structural applications, particularly in aerospace and thermal protection systems where oxidation resistance and thermal stability are critical; hafnium silicides represent an advanced alternative to traditional nickel-based superalloys and carbon composites in extreme environments, though industrial adoption remains limited compared to established refractory ceramics like SiC and ZrB2.

aerospace thermal protectionhypersonic vehicle structuresrefractory composite reinforcementhigh-temperature oxidation barriersresearch/developmental applications

Compliance & Regulations

?Conflict Free?RoHS?REACH?TSCA?Prop 65

Units:

si imperial

Property	Value	Unit	Conditions	Source
Band Gap(Eg)	0.000	eV	—

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.

Hf5Si4

Electrical Properties

Regulatory Screening

Environmental