12007-23-7
hafnium diboride
CAS: 12007-23-7
Molecular Formula: B2Hf-
12007-23-7 - Names and Identifiers
| Name | hafnium diboride |
| Synonyms | HafniuM borid HAFNIUM BORIDE HAFNIUM DIBORIDE hafnium diboride Hafnium boride powder |
| CAS | 12007-23-7 |
| EINECS | 234-500-7 |
| InChI | InChI=1/2B.Hf |
| InChIKey | VFOMGQXFCYKNAF-UHFFFAOYSA-N |
12007-23-7 - Physico-chemical Properties
| Molecular Formula | B2Hf- |
| Molar Mass | 200.11 |
| Density | 10.5 |
| Melting Point | 3250°C |
| Water Solubility | Insoluble in water. |
| Appearance | Powder |
| Specific Gravity | 10.5 |
| Exposure Limit | ACGIH: TWA 0.5 mg/m3NIOSH: IDLH 50 mg/m3; TWA 0.5 mg/m3 |
| Storage Condition | Room Temprature |
| MDL | MFCD00016125 |
12007-23-7 - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | 26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. |
| WGK Germany | 3 |
| TSCA | Yes |
12007-23-7 - Reference Information
| introduction | hafnium boride is a gray metallic luster crystal. Its conductivity is large and its chemical properties are stable. It hardly reacts with all chemical reagents (except hydrofluoric acid) at room temperature. It is prepared by mixing and heating hafnium dioxide with boron oxide or boron carbide, carbon powder, or by hydrogen reduction of hafnium tetrachloride and boron trichloride at 2,000°C or direct reaction of hafnium and boron, and is used as a high temperature resistant alloy. |
| preparation | a combustion synthesis method of high purity hafnium diboride micropowder. The technical scheme of the present invention is as follows: the present invention is realized according to the following steps: the basic raw material and diluent are batched 1., the basic raw material includes hafnium dioxide, boric anhydride and magnesium powder, and the weight percentage is: hafnium dioxide: 30% ~ 60%, boric anhydride: 10% ~ 40%, magnesium powder: 15% ~ 50%, the weight of the added diluent hafnium diboride is 0~3 times that of the basic raw material; 2. drying and mixing; 3., the uniformly mixed raw material powder is loaded into a graphite boat, and then put into a closed pressure vessel. The closed pressure vessel is cooled by circulating water, and the reaction is kept under a protective atmosphere or vacuum conditions with a pressure of 0 ~ 5Mpa. Ignition makes the raw material self-propagate and burn. The product is taken out after 4. cooling. The product is a mixture of hafnium diboride and magnesium oxide, and the magnesium oxide is removed by pickling, then wash, filter, and dry hafnium diboride to obtain hafnium diboride powder. |
| EPA chemical information | information provided by: ofmpub.epa.gov (external link) |
Last Update：2024-04-10 22:29:15
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