12007-99-7
calcium hexaboride
CAS: 12007-99-7
Molecular Formula: B6Ca
12007-99-7 - Names and Identifiers
| Name | calcium hexaboride |
| Synonyms | CALCIUM BORIDE Calcium boride CALCIUM HEXABORIDE Calcium hexaboride calcium hexaboride Calcium boride(CaB6) (oc-6-11)-calcium boride (oc-6-11)-calciumboride(cab6 CALCIUM HEXABORIDE, -200 MESH Calciumboride(CaB6),(OC-6-11)- Calcium boride (CaB6), (OC-6-11)- |
| CAS | 12007-99-7 |
| EINECS | 234-525-3 |
| InChI | InChI=1/B6.Ca/c1-2-5(1)3-4(5)6(1,2)3;/q-2;+2 |
12007-99-7 - Physico-chemical Properties
| Molecular Formula | B6Ca |
| Molar Mass | 104.94 |
| Density | 2.3g/mLat 25°C(lit.) |
| Melting Point | 2235°C |
| Water Solubility | Insoluble in water. Dissolves slowly in acids |
| Appearance | Powder |
| Specific Gravity | 2.3 |
| Storage Condition | 2-8℃ |
| MDL | MFCD00148904 |
12007-99-7 - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. |
| WGK Germany | 3 |
| TSCA | Yes |
12007-99-7 - Nature
Open Data Verified Data
- black solid. Hardness 9. Relative density 2. 33, melting point 2373-K. In air, it is stable at high temperature. Insoluble in hydrochloric acid, hydrofluoric acid, dilute sulfuric acid. Do not react with water. It can be attacked by strong oxidants such as chlorine, fluorine, nitric acid and hydrogen peroxide, and reacts slowly with alkali. There may be three states at room temperature, powder, single crystal and polycrystalline.
- because calcium hexaboride has the characteristics of high melting point, high strength and high chemical stability, many of them also have special functions, such as low electronic work function, constant specific resistance, in a certain temperature range, the value of thermal expansion is zero, different types of magnetic sequence and high neutron absorption coefficient, etc. These superior properties determine that it has a wide range of applications in various device components of modern technology.
- at the same time, due to the characteristics of the connecting structure of boron and calcium atoms in calcium Boride, it has a high melting point, a certain conductivity and excellent electromagnetic radiation resistance.
Last Update：2024-01-02 23:10:35
12007-99-7 - Preparation Method
Open Data Verified Data
There are many methods for preparing calcium boride. Suitable for large scale production are boron carbide, calcium carbonate and carbon powder. The reaction conditions are under vacuum, the reaction temperature is 1400~1800 C, and the reaction time is a certain time.
Last Update：2022-01-01 10:59:12
12007-99-7 - Use
Open Data Verified Data
The nuclear industry used for neutron absorption materials, copper industry deoxidizer, doping source of electronic industry components, refractory additives. At present, the research and application of calcium hexaboride ceramics have developed rapidly, and the dosage form of the product is not limited to powder products, and the polycrystal products are increasingly
In order to meet the development of new materials, it provides a new application field for calcium hexaboride.
Last Update：2022-01-01 10:59:12
12007-99-7 - Safety
Open Data Verified Data
with hard ethylene plastic barrels, external use of wooden boxes, storage and transport to avoid moisture and contact with acid and alkali.
Last Update：2022-01-01 10:59:12
12007-99-7 - Reference Information
| application | used as high conductivity copper deoxidizer, electronic material, alloy, etc. High-purity calcium boride CaB6 is a new high-tech material, which can be used as a neutron-resistant radiation filling material for nuclear reactors, oxygen removal and sulfur extraction additives during superconducting copper smelting, super lightweight refractory materials, boron steel for advanced military and defense industries, etc. Function. |
| prepare | 1. mixture; Boron carbide and calcium-containing raw materials are mixed in proportion. various conventional mixing equipment can be used in the mixing process. the mixing time is determined according to the number of raw materials, generally not less than 30-60 minutes. The boron carbide can be commercially available abrasive grade boron carbide. The calcium-containing raw material can be at least one of calcium oxide, calcium hydroxide, calcium carbonate, calcium bicarbonate and calcium oxalate, and its particle size specification is not more than 325 mesh, and its purity is not less than 97%, wherein boron carbide is a product with a particle size of 25 to 325 mesh, and its purity is not less than 95%. According to the actual situation, activator can also be added to the mixture, its purity is not less than 99%, particle size is not more than 352 mesh. The activator can be carbon powder and boron, and its usage amount does not exceed 5-8% of the total raw material. When carbon powder is used as the activator, graphite, activated carbon or other carbon powder can be used. In this embodiment, the weight ratio of each raw material is 51-55 parts of boron carbide, 38-49 parts of calcium-containing raw material, and 0-25 parts of active agent. 2. press molding; In order to facilitate the smooth discharge of the gas generated in the reaction process, the mixed raw materials can be pressed into a certain shape of material block through a mold and a press. The specific size can be determined according to the subsequent sintering equipment, and generally not more than 100 × 100 × 100mm cube or cylinder with holes in the middle. 3. vacuum or inert gas environment sintering; The mixture is subjected to high-temperature sintering reaction in a vacuum or inert gas environment. The sintering equipment can be various vacuum sintering equipment such as induction furnace or resistance furnace, and a certain degree of vacuum must be ensured before sintering and during sintering to facilitate timely discharge of air and gas generated by reaction. The sintering temperature is 1650-2000 ℃, and the sintering time is 5-8 hours. follow-up treatment of 4. products; After simply dispersing the materials prepared in step 3, calcium boride products can be obtained by screening. If necessary, the prepared product can be further washed and graded to facilitate obtaining calcium boride products with better purity and particle size. |
| production method | this product can be prepared by direct combination of simple substance, compound conversion, electrolysis and other methods. 1. The metal calcium sheet and the calculated amount of amorphous boron are heated in a quartz tube under vacuum. At this time, a fire is emitted and the reaction is completed quickly. 2. The compound converts B2O3 and Ca to dark red to generate CaB6;2.5g B2O3 and 2g CaC2 are heated at 1625 ℃, CaCl2 or CaF2 are mixed and heated evenly to obtain CaB6, and halogen is volatilized as halogen boron compound. 3. Electrolysis CaO, B2O3 and CaF2 were electrolyzed in a graphite crucible at 1000 ℃ with 7.0V and 20A currents. The cooled block is CaB6, which is separated by dissolving impurities with dilute and concentrated HCl in turn. |
| EPA chemical information | information provided by: ofmpub.epa.gov (external link) |
Last Update：2024-04-10 22:29:15
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CAS: 12007-99-7
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