Jewelry material-synthetic polycrystal corundum and method of manufacture of articles from such material

FIELD: jewelry technology; manufacture of jewelry colored inserts.

SUBSTANCE: synthetic corundum contains alumina, color-forming additives and binder-paraffin. Required color is obtained as follows: for obtaining black color molybdenum oxide is added to alumina in the amount of 0.03%; for obtaining gray color, tungsten oxide is added to alumina in the amount of 0.01%; for obtaining blue color, neodymium oxide is added in the amount of 0.01%; for obtaining pink color, erbium oxide is added to alumina in the amount of 0.01%; for obtaining red color, chromium oxide is added in the amount of 0.05%. Proposed method of manufacture of jewelry articles includes molding in casting machines at a pressure of 4 atm and roasting; first roasting cycle is performed in continuous furnaces for burning-out the binder and is continued for 90 h at temperature of 1150 C; second roasting cycle is performed in batch furnaces at temperature of 1750 C and is continued for 170 h for forming and sintering of microcrystals making translucent crock at density of 4 g/cu cm and hardness of 9 according to Mohs hardness scale; then polishing is performed with the aid of diamond materials. Articles thus made have high-quality miniature texture at hardness which is disadvantage in relation to diamond only.

EFFECT: high quality of articles; enhanced hardness of articles.

7 cl

 

The invention relates to technology jewelry industry, more specifically to methods of producing colored jewelry inserts, and inserts with the use of enamel, and is intended for use in the jewelry industry edition.

Currently, the way the Verneuil process is essential in the production of synthetic monocrystalline corundum.

For the jewelry industry at the present time grown Buhl about 150 mm; ⊘35 mm, which is suitable for cutting in the form usually adopted for gemstone jewelry, although losses in the cut reaches 98%. Grown in a furnace Buhl is a material in the form of uporiadochenia located on a crystallographic axis of the crystal, intersecting at an angle of 60°having a grid formed of tiny planes - side curved growth lines rhombohedrons corundum, which are densely adjoin to each other, creating the transparency of the material.

However, for industrial purposes way Verneuil improved very little.

Known monocrystalline corundum and the method of its production of alumina and color-forming additives with a subsequent heat treatment of the crystal at between 1,600 and 1,850°and 1100-1150° (US 3897529, IPC F 27 D 71/00, 29.07.1975 year), but it is not possible to obtain the finished product, as it requires further processing by cutting, abdic is, finishing, sanding, polishing, drilling, cutting, Saltovka, engraving by bringing the material to the product.

The technical result consists in creation of industrial manufacturing jewelry material with the ability to get in the industrial production of copies of finished products in the form of jewelry inserts with high-quality miniature relief of colored polycrystalline corundum, hardness second only to diamond.

Technical result is achieved by jewelry material - synthetic polycrystalline corundum consisting of alumina, color-forming additives and ligaments-paraffin.

At the same time as color-forming additives used molybdenum oxide in the amount of 0.03% to get the black color, the oxide of tungsten in an amount of 0.01% to obtain gray; neodymium oxide in an amount of 0.01% to obtain a blue color; erbium oxide in an amount of 0.01% to obtain a pink color; chrome oxide in the amount of 0.05% to obtain a red color.

The technical result is also achieved by a method of producing articles of jewelry material - synthetic polycrystalline alumina from alumina, color-forming additives and ligaments-paraffin by molding by injection molding machines at a pressure of 4 ATM and firing, and the first firing in furnaces continuous action is for the burning bundles for 90 hours at a temperature of T-1150° With, and the second - in ovens periodic actions during 170 hours at temperature T 1750°for the formation and sintering of microcrystals constituting the transflective crock product density of 4 g/cm3and hardness of 9 units on the Mohs scale, which is then polished with a diamond materials.

Jewelry material was obtained as follows:

as source material using alumina And 1203 brand VK-100-1(2);

grind it in ball mills;

- sift, then

- enter the target color-forming additive and a bunch of the paraffin in the amount of 1.5%.

To obtain a desired color to the alumina add oxides of molybdenum, tungsten, neodymium, erbium or chromium in an appropriate amount.

Articles of polycrystalline corundum produced by its molding by injection molding machines under pressure 4 bar at a temperature of 80°and two-stage annealing.

The formed polycrystalline corundum dual-mode firing for 10 days to create and sintering microcrystals gives you the opportunity to get a FINISHED PRODUCT, creating less transparent, because neuroradiologia location microcrystals, but translucent, translucent and opaque product with a hardness of 9 units on the Mohs scale without further mechanical processing, in addition to polishing.

Thus, the invention p is adequate to obtain high-quality molded FINISHED PRODUCT with a complex miniature relief, this cannot be done in the material monogononta without stone carving and engraving on solid stones in the manufacture of cameos, gems, minisculpture, minireview.

Also, the invention allows to obtain a product - box complex miniature relief chemically neutral substrate composed of microscopic crystals policorundum providing adhesion of enamel to the substrate during repeated firing enamels local colors and enamels with armonicamente halftone colors, without the use of precious metals used for the manufacture of substrates excavation enamels.

1. Jewelry material - synthetic polycrystalline corundum consisting of alumina, color-forming additives and ligaments-paraffin.

2. Jewelry material according to claim 1, in which the color-forming additives used molybdenum oxide in the amount of 0.03% to produce the black color.

3. Jewelry material according to claim 1, in which the color-forming additives used tungsten in an amount of 0.01% to obtain a gray color.

4. Jewelry material according to claim 1, in which the color-forming additives use neodymium oxide in an amount of 0.01% to obtain a blue color.

5. Jewelry material according to claim 1, in which the color-forming additives used erbium oxide in an amount of 0.01% obtained for the I pink color.

6. Jewelry material according to claim 1, in which the color-forming additives use the chromium oxide in the amount of 0.05% to obtain a red color.

7. The method of producing articles of jewelry material - synthetic polycrystalline alumina from alumina, color-forming additives and ligaments - paraffin - through molding by injection molding machines at a pressure of 4 ATM and firing, and the first firing is carried out in continuous furnaces for the burning bundles for 90 h at temperature T 1150°and the second - in ovens periodic action for 170 h at temperature T 1750°for the formation and sintering of microcrystals constituting the transflective crock product density of 4 g/cm3and hardness of 9 units on the Mohs scale, which is then polished with a diamond materials.



 

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