Registration Dossier
Registration Dossier
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EC number: 701-307-9 | CAS number: -
Melting point / freezing point
Administrative data
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
Data source
Reference
- Reference Type:
- publication
- Title:
- Cubic boron nitride: synthesis, physicochemical properties and applications
- Author:
- Laurence Vel, Gérard Demazeau, Jean Etourneau
- Year:
- 1 991
- Bibliographic source:
- Matereials Science and Engineerring, B10 (1991); 149 - 164
Materials and methods
Test guideline
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- not available
- GLP compliance:
- not specified
- Type of method:
- other: unknown
Test material
- Reference substance name:
- boron nitride (cubic)
- EC Number:
- 701-307-9
- Cas Number:
- 10043-11-5
- Molecular formula:
- BN
- IUPAC Name:
- boron nitride (cubic)
- Test material form:
- solid: crystalline
Constituent 1
Results and discussion
Melting / freezing point
- Melting / freezing pt.:
- ca. 3 500 K
- Atm. press.:
- ca. 105 other: kb
- Decomposition:
- no
- Decomp. temp.:
- ca. 1 400 °C
- Remarks on result:
- other: Temperature Range for Stability (°C): Air No oxidation up to 1330°C due to B2O3 protective layer; no conversion to hexagonal form at 1400°C/ Vacuum: Conversion to hexagonal form at 1550-1600°C.
Any other information on results incl. tables
Melting at Triple Point (130 kb, °K): 3500
Applicant's summary and conclusion
- Conclusions:
- Under atmospheric pressure, cBN is stable up to temperatures of 1330°C due to a B2O3 protective layer on particle surfaces preventing the substance from further oxidation. No conversion to the hexagonal form is observed at temperatures up to 1400°C. Under nitrogen atmosphere some conversion to the hexagonal form occurs at 1525°C. The extrapolated melting point at the triple point is around 3500°K at 150 kbar.
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