摘要:
The invention relates to a method for recovering lithium from a starting material comprising lithium. According to the invention, the starting material is heated with carbon in a reactor by carrying out direct inductive heating of the carbon.
摘要:
A graphite electrode for an electrothermic reduction furnace is formed from anode grade coke and graphitized at a graphitization temperature below 2700° C. The resulting electrode is particularly suited for carbothermal reduction of alumina. It has an iron content of about 0.05% by weight, a specific electrical resistivity of above 5 μOhm·m, and a thermal conductivity of less than 150 W/m·K. The graphite electrode is manufactured by first mixing calcined anode coke with a coal-tar pitch binder, and a green electrode is formed from the mixture at a temperature close to the softening point of the pitch binder. The green electrode is then baked to carbonize the pitch binder to solid coke. The resultant carbonized electrode, after further optional processing is then graphitized at a temperature below 2700° C. for a time sufficient to cause the carbon atoms in the carbonized electrode to organize into the crystalline structure of graphite.
摘要:
A method for treating workpieces that consist of porous carbon material with liquid silicon with the formation of silicon carbide, comprising the steps: Preheating porous carbon workpieces under inert gas to the selected operating temperature TB1, feeding liquid silicon to the porous carbon workpieces at an operating pressure pB2 and an operating temperature TB2, and impregnating the porous carbon workpieces with liquid silicon, reaction of the liquid silicon in the workpiece at a temperature TB3 with the formation of silicon carbide that consists of carbon and silicon, gassing the workpiece with inert gas and cooling from the operating temperature TB3 to the conditioning temperature Tk, cooling the workpieces to room temperature, the temperature TB3 being greater than or equal to the temperature TB2, and the workpiece in step d of the method no longer being in contact with liquid silicon outside of the workpiece.
摘要:
Method for treatment of workpieces of porous carbon material with liquid silicon with the formation of silicon carbide, comprising the following steps: preheating of porous carbon workpieces under an inert gas to a selected operating temperature TB1, delivery of liquid silicon to the porous carbon workpieces at an operating pressure pB2 and an operating temperature TB2 and impregnation of the porous carbon workpieces with liquid silicon, reaction of the liquid silicon in the workpiece at a temperature TB3 with formation of silicon carbide from carbon and silicon, gassing of the workpieces with inert gas, and cooling from the operating temperature TB3 to a conditioning temperature Tk, cooling of workpieces to room temperature, in step c the delivery of silicon and transport of the workpieces taking place over preferably cylindrical rolls which are porous at least in the exterior region and which are pivoted, and their speed of rotation determining the residence time for the delivery of silicon in step c, and the temperature TB3 being greater than or equal to the temperature TB2, and the workpieces for process step d no longer being in contact with liquid silicon outside the workpieces.
摘要:
A glass powder or a glass-ceramic powder is provided that includes multicomponent glasses with at least three elements, where the glass powder or a glass-ceramic powder has a mean particle size of less than 1 μm. In some embodiments, the mean particle size is less than 0.1 μm, while in other embodiments the mean particle size is less than 10 nm.
摘要:
A graphite electrode for an electrothermic reduction furnace in which aluminum is produced by carbothermic reduction of alumina is rendered substantially gas-impermeable. The graphite electrode is consumed during furnace operation and electrode columns connected by graphite pins are fed continuously fed in from the top into the furnace. The coating of the electrode withstands a temperature of up to 300° C. and more over a period of several hours without oxidation. Since the coating enters the furnace compartment at least partially, it is configured so that it will not contaminate the hot melt. That is, the chemistry of the coating materials is similar to 1o the ingredients of the overall reaction or, at a minimum, the amount of foreign elements is very low. The coating is provided so that it does not increase the electrical contact resistance at the connection between the electrode columns and the electrode holding clamps. Where the electrode inlet area is cooled by water, the coating is insoluble in water.
摘要:
A glass sealant comprises a mixture of about 70-90% of a solder glass powder of a low-melting lead-borate glass with a transformation temperature of 330.degree. C. or lower, 1-20% by weight of cordierite powder, and 1-25% by weight of mullite powder, with the combined content of cordierite and mullite powder being from about 10-30%. The lead-borate glass comprises from about 82-88% by weight of PbO, 12-17% by weight of B.sub.2 O.sub.3, 0-1% by weight of SiO.sub.2, and 0-1% by weight of Al.sub.2 O.sub.3. Both the cordierite and mullite powder are preferably synthetically produced to reduce the .alpha.-radiation. The synthetically produced cordierite powder preferably still contains up to about 9% by weight of a non-crystalline vitreous phase. The grain size of the powders is preferably under 100 microns. This glass sealant has well-balanced properties relative to thermal expansion, melting temperature, dielectric constant, loss angle, mechanical strength, thermal shock resistance, and chemical resistance. It is particularly suitable as ceramic dual-line package solder (CERDIP) for sealing of aluminum oxide housings for integrated circuits.
摘要翻译:玻璃密封剂包括约70-90%的低熔点硼酸铅玻璃的焊料玻璃粉末与转化温度为330℃或更低,1-20重量%的堇青石粉末和1 -25重量%的莫来石粉末,堇青石和莫来石粉末的组合含量为约10-30%。 铅硼酸盐玻璃包含约82-88重量%的PbO,12-17重量%的B 2 O 3,0-1重量%的SiO 2和0-1重量%的Al 2 O 3。 优选合成制备堇青石和莫来石粉末以减少α-辐射。 合成生产的堇青石粉末优选还含有至多约9重量%的非结晶玻璃质相。 粉末的粒径优选在100微米以下。 该玻璃密封剂相对于热膨胀,熔融温度,介电常数,损耗角,机械强度,耐热冲击性和耐化学性而具有良好的平衡性。 特别适用于用于集成电路的氧化铝壳体的密封的陶瓷双线包装焊料(CERDIP)。
摘要:
Process for producing bodies from ceramic materials using silicon carbide, comprising the steps: configuration of fiber-reinforced porous bodies (1, 5) that consist of carbon on a base (2) that is inert relative to liquid silicon, the bodies having cavities (3) that are accessible from the exterior or surface recesses (3′), and the cavities (3) being closed at the bottom in the porous bodies or the surface recesses (3′) together with the base (2) forming a reservoir that is sealed at the bottom; heating the configuration by introduction of energy to melt the silicon (6) that is present in the reservoir; and infiltrating the melted silicon in the bodies (1, 5) and reaction of the silicon with the carbon to form silicon carbide; and use of the thus produced bodies as brake disks and as clutch driving disks.
摘要:
Graphite electrodes for the production of aluminum by carbothermic reduction of alumina are either submerged in the molten bath in the low temperature compartment or they are horizontally arranged in the side walls of the high temperature compartment. The electrodes are manufactured by using a mixture of coke particles covering the complete particle size range between 25 μm to 3 mm and by using an intensive mixer to effectively wet all coke particles with pitch. The electrodes have a flexural strength of at least 20 N/mm2. By using a complete range (continuum) of particle sizes in conjunction with an intensive mixer, the geometric packing of the particles is significantly improved, hence the material density is increased and thus a higher mechanical strength as well as improved electrical conductivity in comparison to conventional graphite electrodes is achieved.
摘要:
A method for treating workpieces that consist of porous carbon material with liquid silicon with the formation of silicon carbide, comprising the steps: Preheating porous carbon workpieces under inert gas to the selected operating temperature TB1, feeding liquid silicon to the porous carbon workpieces at an operating pressure pB2 and an operating temperature TB2, and impregnating the porous carbon workpieces with liquid silicon, reaction of the liquid silicon in the workpiece at a temperature TB3 with the formation of silicon carbide that consists of carbon and silicon, gassing the workpiece with inert gas and cooling from the operating temperature TB3 to the conditioning temperature Tk, cooling the workpieces to room temperature, the temperature TB3 being greater than or equal to the temperature TB2, and the workpiece in step d of the method no longer being in contact with liquid silicon outside of the workpiece.
摘要翻译:一种用于处理由多孔碳材料与液态硅组成的工件,形成碳化硅的方法,包括以下步骤:将惰性气体下的多孔碳工件预热至所选择的操作温度T B 1, 硅在工作压力p B 2 2和工作温度T B 2下与多孔碳工件接触,并用液态硅浸渍多孔碳工件,液态硅 在由碳和硅组成的碳化硅形成的温度为T 3 B 3的工件中,用惰性气体吹送工件,并从工作温度T B B 3到调理温度T k,将工件冷却至室温,温度T B 3 3大于或等于温度T B SUB > 2,并且步骤d中的工件不再与外部的液态硅接触 工件。