Pre-melting crystallization method for high-purity alpha-alumina
An alumina, pre-melting technology, applied in chemical instruments and methods, single crystal growth, crystal growth and other directions, can solve problems such as inability to hot melt, and achieve the effects of easy control, high purity and simple process
Inactive Publication Date: 2012-04-04
YANGZHOU ZHONGTIANLI NEW MATERIAL
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Embodiment Construction
[0008] Prepare a high-frequency induction furnace, the furnace body is a metal cold crucible, and an induction coil is arranged outside the metal cold crucible.
[0009] Put the high-purity а-alumina powder into the metal cold crucible first, and bury the ring-shaped distribution of pure aluminum powder in the high-purity а-alumina powder. Under the action of the induced current, the aluminum powder catches fire and burns to generate heat to melt the surrounding area. After the high-purity а-alumina powder is completely melted, the melt is cooled and solidified to obtain a high-purity а-alumina pre-fused block.
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Abstract
The invention discloses a pre-melting crystallization method for high-purity alpha-alumina, and relates to the technical field of pre-melting crystallization processes of high-purity materials. High-purity alpha-alumina micro powder is added into a metal cold crucible provided with an induction coil at the periphery; aluminum powder is buried in the high-purity alpha-alumina micro powder and bursts into flame under the action of induction current to produce heat to melt surrounding high-purity alpha-alumina micro powder; and after the high-purity alpha-alumina micro powder is completely melted, the melt is cooled and solidified to obtain a high-purity alpha-alumina pre-melt. The method has a simple and rational process and is easy to control; no other impurities are introduced during crystallization; high purity of the alpha-alumina can be kept; meanwhile, residual gas in the micro powder can also be effectively removed. The method also facilitates realization of continuous feeding and crystallization; and compared with oxyhydrogen flame, the heating mode has the advantages of saving energy by 30 percent and improving yield by 5 times.
Description
technical field [0001] The invention relates to the technical field of pre-melting crystallization technology for high-purity materials. Background technique [0002] High-purity α-alumina can be used to produce sapphire, because the high-purity α-alumina is a fine powder with a particle size of only 0.1-0.5μm, and the specific gravity is small (about 0.25g / cm 3 ), in order to improve production efficiency and increase the amount of high-purity а-alumina fed each time sapphire is produced, some manufacturers require secondary processing of high-purity а-alumina, that is, high-purity а-alumina is required to Alumina micropowder is made into a crystalline product with a large specific gravity. [0003] Since high-purity α-alumina is neither conductive nor magnetic at 800°C, it cannot be melted if placed directly in a metal cold crucible. Contents of the invention [0004] The object of the invention is to propose a pre-melting crystallization method of high-purity а-alumin...
Claims
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IPC IPC(8): C04B35/64C04B35/653C30B29/20
Inventor 王继荣李显坪陈琦裴勇康
Owner YANGZHOU ZHONGTIANLI NEW MATERIAL