Method for artificially synthesizing sapphire

An artificial synthesis, sapphire technology, applied in chemical instruments and methods, single crystal growth, polycrystalline material growth and other directions, can solve problems such as bluish or reddish, affect quality and color, limit the application of artificial sapphire, etc., to reduce production costs , the effect of improving labor productivity

Inactive Publication Date: 2011-04-13
四川鑫通新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After annealing, the artificial sapphire produced will appear bluish or reddish, which will affect the quality and color
It limits the application of artificial sapphire in industrial fields such as microwave dielectric materials, waveguide lasers, high-precision bearing components, and optical lenses with high light transmittance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation: Select a trial production equipment sintering machine with better performance; prepare pure white non-agent α-Al for test 2 o 3 The powder has a purity of 99.996% and an average particle size of 3.4 μm. Make the 120 mesh screen for the charging hopper.

[0036] Cleaning: Blow the inside of the hopper with a blower.

[0037] Charging: put pure white non-agent α-Al 2 o 3 Pour the powder into the 120-mesh sieve loading hopper, and cover it to isolate the dust.

[0038] Seed insertion: Insert the seed crystal with a crystal orientation of 90° on the M axis vertically into the top of the growth support; Light refraction has an effect.

[0039] Burning crystals: 1), ignition, gas adjustment: ignite the hydrogen-oxygen flame, adjust the ratio of hydrogen-oxygen normal gas to 2.4:1, and the flame temperature is 2020°C.

[0040] 2) Chemical material crystallization: start the electromagnet to strike the hammer, strike the material guide rod of the hopper to d...

Embodiment 2

[0053] Preparation: Select a trial production equipment sintering machine with better performance; prepare pure white non-agent α-Al for test 2 o 3 The powder has a purity of 99.996% and an average particle size of 3.4 μm. Make the 120 mesh screen for the charging hopper.

[0054] Cleaning: Blow the inside of the hopper with a blower.

[0055] Charging: put pure white non-agent α-Al 2 o 3 Pour the powder into the 120-mesh sieve loading hopper, and cover it to isolate the dust.

[0056] Seed insertion: Insert the seed crystal with a crystal orientation of 90° on the M axis vertically into the top of the growth support; Light refraction has an effect.

[0057] Burning crystals: 1), ignition, gas adjustment: ignite the hydrogen-oxygen flame, adjust the ratio of hydrogen-oxygen normal gas to 2.4:1, and the flame temperature is 2020°C.

[0058] 2) Chemical material crystallization: Start the electromagnet to strike the hammer, strike the material guide rod of the hopper to d...

Embodiment 3

[0071] Preparation: Select a trial production equipment sintering machine with better performance; prepare pure white non-agent α-Al for test 2 o 3 The powder has a purity of 99.996% and an average particle size of 3.4 μm. Make the 120 mesh screen for the charging hopper.

[0072] Cleaning: Blow the inside of the hopper with a blower.

[0073] Charging: put pure white non-agent α-Al 2 o 3 Pour the powder into the 120-mesh sieve loading hopper, and cover it to isolate the dust.

[0074] Seed insertion: Insert the seed crystal with a crystal orientation of 90° on the M axis vertically into the top of the growth support; Light refraction has an effect.

[0075] Burning crystals: 1), ignition, gas adjustment: ignite the hydrogen-oxygen flame, adjust the ratio of hydrogen-oxygen normal gas to 2.4:1, and the flame temperature is 2020°C.

[0076] 2) Chemical material crystallization: start the electromagnet to strike the hammer, strike the material guide rod of the hopper to d...

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Abstract

The invention belongs to the technical field of a preparation method of an artificial crystal material, in particular relating to a method for artificially synthesizing sapphire and aiming to solve the technical problem of providing a preparation method of the artificially synthesized pure white sapphire with stable product quality. The preparation method of artificially synthesizing the sapphirecomprises the following steps: adding a raw material; inserting seed crystals; and sintering crystals, wherein, the step of sintering the crystals comprises the procedures of crystallizing chemical materials, centering, expanding the crystals and performing equal-diameter growth; the adopted raw material is aluminum oxide pure white powder, the purity is at least 99.996%, the particle size is 2.1mu m-5.7mu m, and the density is 1.14-1.86g / m<3>; and crystal roots (Phi3-5mm and L5-8mm) grow before expanding the crystals. In the invention, the pure white high-purity superfine aluminum oxide powder is used to replace aluminum oxide powder containing an ammonium ferric sulfate oiling agent and an ammonium fluorotitanate oiling agent to obtain the artificially synthesized pure white sapphire without impurities.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of artificial crystal materials, in particular to a method for artificially synthesizing sapphire. Background technique [0002] In the production process of traditional alumina powder, in order to solve the problem of the properties of alumina powder, some chemical impurities (such as: ferric ammonium sulfate, ammonium fluotitanate, formazan base red). At present, artificial sapphire manufacturers all adopt the above-mentioned alumina powder added with chemical impurities for production. The traditional production process includes the steps of adding raw materials, inserting crystal seeds, and sintering crystals. Sintering crystals is divided into chemical material crystallization, centering, growing crystal roots, crystal expansion, and equal-diameter growth. Specifically: use δ-Al 2 o 3 or γ-Al 2 o 3 Alumina powder is used as the raw material, the seed crystal is 90° on the M-a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/20
Inventor 钱幼平代成唐大林
Owner 四川鑫通新材料有限责任公司
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