Hafniumcarbid
|
|
|
- CAS-Nr.
- 12069-85-1
- Bezeichnung:
- Hafniumcarbid
- Englisch Name:
- HAFNIUM CARBIDE
- Synonyma:
- HAFNIUM CARBIDE;hafnium,methane;hafnium(iv) carbide;Hafnium monocarbide;Hafnium carbide HfC;Hafnium carbide/ 99+%;Hafnium carbide ceramics;Hafnium Carbide, -325 Mesh;Methanidylidynehafnium(1+);Hafnium(IV) carbide, 99.8%
- CBNumber:
- CB0124513
- Summenformel:
- CHf
- Molgewicht:
- 190.5
- MOL-Datei:
- 12069-85-1.mol
|
Hafniumcarbid Eigenschaften
- Schmelzpunkt:
- 2930 °C(lit.)
- Dichte
- 12.2 g/mL at 25 °C(lit.)
- RTECS-Nr.
- MG4620000
- Aggregatzustand
- Powder
- Farbe
- Gray
- Widerstand (resistivity)
- 45.0 (ρ/μΩ.cm)
- Wasserl?slichkeit
- it is insoluble in water.
- Crystal Structure
- Cubic, NaCl Structure
- Expositionsgrenzwerte
- ACGIH: TWA 0.5 mg/m3
NIOSH: IDLH 50 mg/m3; TWA 0.5 mg/m3
- InChIKey
- NVDNLVYQHRUYJA-UHFFFAOYSA-N
- CAS Datenbank
- 12069-85-1
- EPA chemische Informationen
- Hafnium carbide (HfC) (12069-85-1)
Sicherheit
- Risiko- und Sicherheitserkl?rung
- Gefahreninformationscode (GHS)
| RIDADR |
UN3178 |
|
|
| WGK Germany |
3 |
|
|
| TSCA |
Yes |
|
|
| HazardClass |
4.1 |
|
|
| PackingGroup |
III |
|
|
| Bildanzeige (GHS) |
|
| Alarmwort |
Warnung |
| Gefahrenhinweise |
| Code |
Gefahrenhinweise |
Gefahrenklasse |
Abteilung |
Alarmwort |
Symbol |
P-Code |
| H228 |
Entzündbarer Feststoff. |
Entzündbare Feststoffe |
Kategorie 1 |
Achtung
Warnung |
![GHS hazard pictograms]() src="/GHS02.jpg" width="20" height="20" /> |
P210, P240,P241, P280, P370+P378 |
|
| Sicherheit |
| P210 |
Von Hitze, hei?en Oberfl?chen, Funken, offenen Flammen und anderen Zündquellenarten fernhalten. Nicht rauchen. |
| P240 |
Beh?lter und zu befüllende Anlage erden. |
| P241 |
Explosionsgeschützte [elektrische/Lüftungs-/ Beleuchtungs-/...] Ger?te verwenden. |
| P280 |
Schutzhandschuhe/Schutzkleidung/Augenschutz tragen. |
| P370+P378 |
Bei Brand: zum L?schen verwenden. |
|
Hafniumcarbid Chemische Eigenschaften,Einsatz,Produktion Methoden
Chemische Eigenschaften
dark, gray, brittle solid; fcc, a=0.4640 nm; high cross section for absorption of thermal neutrons; resistivity 8.8μohm· cm; most refractory binary material known; hardness 2300kgf/mm2; used in control rods of nuclear reactors; can be prepared by heating HfO2 with lampblack under H2 at 1900°C–2300°C; used in crucible form for melting hafnium oxide, other oxides [KIR80] [HAW93] [CER91]
Physikalische Eigenschaften
Dark gray brittle solid, most
refractory binary material
known. Controls rods in nuclear
reactors, crucible container for
melting HfO and other oxides. 2
Corrosion resistant to liquid
metals such as Nb, Ta, Mo, and
W. Severe oxidation in air above
1100–1400°C and stable up to
2000°C in helium.
Verwenden
Hafnium carbide (HfC) with a melting point over 3890°C is a refractory binary compound. HfC and NbC can also be used as refractory coatings in nuclear reactors. The mixed carbide Ta4HfC5 possesses the highest melting point of any currently known compound at 4215°C.
Vorbereitung Methode
Hafnium carbide is a dark gray, brittle solid. It can be
prepared by heating a mixture of the elements or by reacting
hafnium tetrachloride with methane at 2100 C. Sufficient
quantities of hafnium oxide or hafnium metal sponge are
obtained during the large-scale production of pure zirconium
for nuclear reactors. On an industrial scale, hafnium carbide
can be produced from the hydrided hafnium sponge at
1500–1700 ℃ or from hafnium oxide at 2000–2200 ℃ by
carburization in vacuo in the presence of hydrogen.
The resulting carbide contains almost the theoretical quantity
of carbon (6.30% °C) and a maximum of 0.1% free carbon
(219). The hafnium carbide obtained is not a true
stoichiometric compound as much as a solution of carbon
at specific interstitial sites of a face-centered cubic hafnium
lattice.
Hafnium carbide is inert to most reagents at room temperature
but is dissolved by hydrofluoric acid solutions.
Hafnium carbide reacts exothermally with halogens at
250–500 ℃to form hafnium tetrahalide, and to form hafnium
oxide with oxygen above 500℃. In the presence of hydrogen,
hafnium carbide slowly loses some of its carbon at higher
temperatures.
Hafniumcarbid Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
Hafniumcarbid Anbieter Lieferant Produzent Hersteller Vertrieb H?ndler.
Global( 147)Lieferanten
12069-85-1(Hafniumcarbid)Verwandte Suche:
- HAFNIUM CARBIDE
- Hafnium carbide ceramics
- hafnium(iv) carbide
- HAFNIUM CARBIDE , 45 MICRON
- Hafnium carbide, 99.5% (metals basis excluding Zr), Zr <1%
- HAFNIUM(IV) CARBIDE, <1.25 MICRON
- HAFNIUM(IV) CARBIDE -325MESH
- Hafnium Carbide, -325 Mesh
- Hafnium carbide/ 99+%
- Hafnium monocarbide
- Hafnium(IV) carbide <1.25 mum particle size
- Hafnium carbide, 99.5% trace metals basis
- Hafnium carbide powder (HfC)
- um 99.8%Methanidylidynehafnium(1 Methanidylidynehafnium(1+)
- hafnium,methane
- Methanidylidynehafnium(1+)
- Hafnium carbide HfC
- Niobium Oxide (Nb2O5) Powder
- Hafnium(IV) carbide, 99.8%
- Hafnium(IV) carbide, <1.25 μm
- Hafnium Carbide Micro powder
- Cobalt Chromium (Co-Cr) Alloy Sputtering Targets
- Hafnium Carbide HfC Powder
- 12069-85-1
- HfC2
- HfC
- CHf
- Hafnium
- Catalysis and Inorganic Chemistry
- CarbidesChemical Synthesis
- Catalysis and Inorganic Chemistry
- Ceramics
- Hafnium
- Metal and Ceramic Science
