Beryllium Oxide (BeO) Ceramic Substrates,BeO heat sinks, crucibles, washers, tubings

Beryllium oxide property Melting point ：2575°C Boiling point ：4300 ° C Density ：3.01 g/mL at 25 °C (lit.) Refractive index： 1.733 Flashpoint: 4300 ° C Form: Powder Specific gravity: 3.01 Colour: white Insoluble in water: Slowly soluble in concentrated acids, alkali hydroxides Merck 14,1172 Stability: Stable. Beryllium oxide is a kind of white amorphous powder which is not soluble in water. Due to its extremely high melting point and excellent thermal conductivity, it is generally used in microwave high-power electric vacuum devices and microelectronic packaging devices. production method In view of the distribution characteristics of mineral resources in China, Beryllium oxide concentrate, limestone and sulfuric acid are generally used as raw materials for the production of cerium oxide. At present, the following three processes are mainly used in domestic and foreign enterprises: sulfuric acid method, sulfuric acid extraction method and fluorination method. 1.Sulfuric acid method The sulphuric acid method is smelted by high-temperature smelting of beryl and limestone in an electric arc furnace, and then heated by 100 degrees or more, and rapidly added with concentrated sulfuric acid for acidification. The produced sulfate is leached and filtered in a leaching tank, and a metal such as bismuth, iron or aluminium is introduced into a human solution to separate from silicon, calcium, and the like. After removing the iron and aluminium elements in the solution, adding sodium hydroxide, stirring, filtering, drying, and satin burning, an industrial beryllium oxide can be obtained. The total recovery rate of the law can reach about 75%. 2. Sulfuric acid extraction The method is an improved process of the sulfuric acid method. The process uses beryl and limestone as raw materials and is smelted by high temperature, water quenched, acidified, and leached to obtain a barium sulfate solution containing impurities such as aluminium and iron, extracted with an extractant, and then added with hydrogen. Sodium oxide back extraction, while heating to 70 degrees, can be obtained after hydrolysis of Be (OH) 2, high-temperature calcination to obtain industrial beryllium oxide. 3. Fluorination The fluorination method uses beryl to react with sodium fluorosilicate and sodium carbonate at 750 degrees to form a soluble sodium fluoroantimonate salt to separate from impurities. The filtrate is alkali added to form a cerium hydroxide precipitate, and the high-temperature calcination can obtain industrial cerium oxide. The total recovery rate of the law can reach about 85%. Application 1. Nuclear industry Due to its higher scattering cross-section and lower reduction ratio than strontium and graphite, and its high density and high thermal conductivity at high temperatures, cerium oxide is very suitable for the manufacture of reflectors, speed reducers and reactors in reactors. Disperse phase fuel matrix. At the same time, it can also be applied to nuclear reactors in ships, ships and other facilities. 2. Military and aerospace fields Cerium oxide has a high heat capacity and heat transfer properties, generally used as a shell for rockets and missiles returning to the atmosphere and rocket nozzles or refractory materials in a new generation of supersonic aircraft. At the same time, it can be used for its good thermal shock stability. The blades of the turbine wheel. 3. Ceramic materials field Among many oxide ceramics, yttria ceramics have the best thermal conductivity, the largest specific heat value, and have the characteristics of high strength, high rigidity, high melting point, and stable size, and are widely used in the electronics industry. It is often used in fields such as electrical insulators, semiconductor devices, transistor pedestals, and microwave antenna windows. 4. Refractory field Oxide has a large unit resistance and strong carbon-reducing power. It is an excellent refractory material, generally used for making reflective screens in induction furnaces, and also for electric furnaces heated by tungsten heating elements. At the same time, it also has a high heat of formation and low partial pressure of oxygen, which is difficult to be reduced, and thus can also be used for preparing crucibles for heating when extracting uranium. 5. Other fields Cerium oxide can also be used in special coatings to improve the thermal stability and corrosion resistance of materials. For example, the addition of yttrium oxide to glass allows X-rays to pass through, can be used for structural analysis and medical treatment, etc. It can also be combined with zirconium, molybdenum or other refractory metals to form high-temperature resistant bismuth compounds for use in aircraft external corrosion resistant materials. Preparation. Stock and transportation condition: Before transporting, check whether the packaging container is complete and sealed. During transportation, ensure that the container does not leak, collapse, fall or damage. It is strictly forbidden to mix with acids, oxidants, foods and food additives. Transport vehicles should be equipped with leakage emergency handling equipment when transporting. During transportation, it should be protected from exposure, rain and high temperature. When transporting by road, follow the prescribed route and do not stay in residential areas and densely populated areas. Health hazard Ingestion or vacuuming can be poisoned. Acute poisoning can cause bronchitis, peribronchial inflammation and bronchial pneumonia. Can cause dermatitis, skin ulcers and skin granuloma. Chronic exposure can cause diffuse granulomatous lesions in the lungs. first-aid Skin contact: Remove contaminated clothing and rinse with plenty of running water. Eye contact: Lift eyelids and rinse with running water or saline. Seek medical attention. Inhalation: Remove quickly from the scene to fresh air. Keep the airway open. If breathing is difficult, give oxygen. If breathing stops, take artificial respiration immediately and seek medical attention. Ingestion: Drink plenty of warm water and induce vomiting. Seek medical attention.