Preparation method of sapphire micro-capillary and die used in preparation method

Abstract

The invention provides a preparation method of a sapphire micro-capillary. An edge-defined film fed lifting growth technology is utilized. The preparation method comprises the following steps of (1) selecting a raw material, i.e., selecting high-purity aluminum oxide as the raw material; (2) machining a die; (3) placing the raw material in a crack between an outer die and an inner die, then, placing the die into a crucible, and next, placing the crucible in a crystal growing furnace; and (4) vacuumizing the crystal growing furnace, heating to melt aluminum oxide to form a melt, then, lifting the melt to the top of the inner die, starting to drop seed crystals, seeding and lifting. By using the method provided by the invention, defects that bubbles are generated on inner and outer walls of a machined sapphire pipe, and the parts containing the bubbles on the inner and outer walls need to be polished are avoided, and the one-step formation of the sapphire micro-capillary with a small internal diameter is realized; and in addition, the preparation method has the advantages of simple process, convenience in machining, high rate of finished products and the like.

Description

technical field [0001] The invention belongs to the technical field of crystal growth, and in particular relates to a method for preparing a sapphire microcapillary and a mold used therefor. Background technique [0002] Single crystal sapphire tube is a single crystal grown slowly from the melt, not polycrystalline, not machined, nor sintered with high-temperature alumina powder. Single crystal sapphire tube has very high transparency and has a regular appearance. , smooth surface, good crystal integrity, etc., and due to a series of excellent properties such as high melting point, high hardness, corrosion resistance, and good infrared transmittance of sapphire crystal itself, such products can be used in semiconductors, chemicals, In the high-tech fields of aviation, aerospace, national defense and other industries, most of the existing sapphire tube processing methods are as follows. Holes are drilled on solid rods. The disadvantage of this processing method is that the ...

AI Technical Summary

Problems solved by technology

[0002] Single crystal sapphire tube is a single crystal grown slowly from the melt, not polycrystalline, not machined, nor sintered with high-temperature alumina powder. Single crystal sapphire tube has very high transparency and has a regular appearance. , smooth surface, good crystal integrity, etc., and due to a series of excellent properties such as high melting point, high hardness, corrosion resistance, and good infrared transmittance of sapphire crystal itself, such products can be used in semiconductors, chemicals, In the high-tech fields of aviation, aerospace, national defense and other industries, most of the existing sapphire tube processing methods are as follows. Holes are drilled on solid rods. The disadvantage of this processing method is that the concentricity between the inner hole and the sapphire tube is poor, and it is not suitable for the processing of longer or smaller sapphire tubes; , directly draw the tubular sapphire with the required inner and outer diameters and lengths from the melt. The process is simple, but after practice, it is found that the inner and outer walls of the processed sapphire tube have bubbles, and the inner and outer walls containing bubbles need to be polished off. In order to avoid affecting the use of sapphire tubes, it is also not suitable for the processing of longer or smaller sapphire tubes

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