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Artificial gemstones and preparation method thereof

An artificial gem, polycrystalline and transparent technology, applied in the field of gems, can solve the problems of inability to prepare multi-colored artificial gemstones alternately doped with multi-colors, waste of raw materials, product cost, inability to produce fluorescent phenomenon, etc., and achieve flexible and variable products. , low market price, easy mass production effect

Inactive Publication Date: 2016-05-25
章韵瑾
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (1) The preparation technology is complex, the production equipment is expensive, and the product price is relatively high;
[0009] (2) Most of the grown crystals are columnar, and to be processed into gemstone products, the amount of cutting and polishing is very large, resulting in the waste of a large amount of raw materials and the increase of product cost;
[0010] (3) No matter the single crystal artificial gemstone of which kind of material, all can only make monochrome gemstone, can't prepare the multi-color artificial gemstone that multiple colors are doped alternately;
[0011] (4) Due to the crystal structure characteristics of the single crystal artificial gemstone material (the whole gemstone is a large single crystal), it is impossible to produce the fluorescent phenomenon formed by the diffuse reflection inside the polycrystal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Using commercial high-purity ultra-fine α-alumina powder, adding 0.1% mole of magnesium oxide (added in the form of nitrate) as a sintering aid, adding 0.5% mole of chromium oxide (also added in the form of nitrate) for Chromogenic ions, and add 2% by weight of organic binder (such as polyvinyl alcohol), use alumina balls and absolute ethanol to mix and ball mill in a ball mill jar for 20 hours, dry at 60°C and then granulate to pass 60 mesh Sieve, and then use a special steel mold to dry-press under a pressure of 200 MPa to form a gemstone green body with a slightly convex lower end and a hemispherical upper end. The green body is first pre-fired in air at 1100°C (slowly heated) for 4 hours to remove organic matter and convert nitrates into oxides, and then sintered in a hydrogen furnace at 1700°C for 8 hours to obtain a polycrystalline transparent ruby ​​body. After grinding and polishing, the polycrystalline transparent ruby ​​​​loose stone ring face can be made.

Embodiment 2

[0039] Using commercial high-purity ultra-fine α-alumina powder, adding 0.1% mole of magnesium oxide (added in the form of nitrate) as a sintering aid, adding 0.5% mole of chromium oxide (also added in the form of nitrate) for Chromogenic ions, and add 2% by weight of organic binder (such as polyvinyl alcohol), use alumina balls and absolute ethanol to mix and ball mill in a ball mill jar for 20 hours, dry at 60°C and then granulate to pass 60 mesh Sieve to make powder raw material A; also adopt commercial high-purity ultrafine α-alumina powder, add 0.1% mol number of magnesium oxide (added in the form of nitrate) as a sintering aid, add 0.5 mol number of vanadium oxide ( Add in the form of oxalate) as the chromogenic ion, and add 2% by weight organic binder (such as polyvinyl alcohol), mix and ball mill in a ball mill jar with alumina balls and absolute ethanol for 20 hours, 60 After drying at ℃, granulate and pass through a 60-mesh sieve to make powder raw material B. Then ...

Embodiment 3

[0041] Mix commercial high-purity ultrafine yttrium oxide powder and alumina powder at a molar ratio of 3:5, add 0.5% by weight of TEOS as a sintering aid, and add 0.5% by weight of chromium oxide as a chromogenic ion. Aluminum balls and absolute ethanol were mixed and milled in a ball mill tank for 20 hours, dried at 60°C, and then 2.0% by weight of ammonium polyacrylate was added as a dispersant to prepare a water-based slurry with a solid content of 30% by volume . Gypsum molds are used for grouting to form an egg-shaped green body. After drying, pre-fire at 800°C to remove organic matter, and then sinter in a vacuum furnace at 1750°C for 24 hours to obtain an emerald-green polycrystalline transparent yttrium aluminum garnet artificial gemstone body. , and then processed into egg noodles or faceted bare stones.

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Abstract

The invention provides artificial gemstones and a preparation method thereof. Polycrystalline transparent gemstone raw materials which are prepared by a powder preparation method are used as raw materials of the artificial gemstones. The preparation method of the artificial gemstones comprises the following steps: high-purity oxide micro powder which employs aluminum oxide, magnesium oxide, yttrium oxide, zirconium oxide, gadolinium oxide and gallium oxide as substrate raw materials is used; a proper amount of coloring metal oxides or metal salts are added, or coloring elements are not added; uniform mixing, moulding, sintering, cutting, engraving, polishing and burnishing are carried out, various monochromatic or polychromatic polycrystalline transparent colored gemstones with high refractive index and high hardness are prepared, or polycrystalline colorless transparent artificial gemstones with high refractive index and high hardness are prepared. The method has the advantages of low producing cost, relatively simple process, low production equipment investment and operation cost, easy realization of large batch production, flexible and changeable products, strong market competitiveness, etc.

Description

technical field [0001] The invention relates to a gemstone, in particular to an artificial gemstone and a preparation method thereof. Background technique [0002] Gemstones are one of people's favorite decorations. From jewelry (rings, bracelets, bracelets, etc.), pendants, earrings, to home decorations, they are loved and welcomed by people from all walks of life. Gemstones are divided into two categories: natural gemstones and man-made gemstones. Natural gemstones are mineral crystals (single crystal or double crystal) produced in nature that are beautiful, durable, rare, and can be processed into ornaments. Because natural gemstones are rare and expensive, it is difficult to meet the needs of market consumption, especially some rare gemstones with high natural quality, bright color and large body are even more difficult to see in the market, and the high price is amazing. Therefore, some physical and chemical properties are basically similar to natural gemstones, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/44C04B35/505C04B35/443C04B35/01C04B35/622
Inventor 章韵瑾
Owner 章韵瑾
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