Method of dyeing natural and sinteticheskih gemstone jewelry

 

(57) Abstract:

Approved for use in the jewelry industry for coloring colorless Topaz, sapphire and quartz in color from yellow to bright yellow-orange. The method comprises applying to the surface layer of iron and subsequent heat treatment in oxygen atmosphere. The heat treatment is carried out in three stages: heating, exposure and cooling, and heating and cooling are a speed of 0.1-5oC/min, and the extract is carried out at a temperature of 600-1000oC. provide a stable reproducible color in a wide range of colors from yellow to bright yellow-orange, does not require additional polishing for later use. 6 C.p. f-crystals.

The invention relates to methods for processing natural and synthetic gemstones, in particular to a method of coloring colorless Topaz, sapphire and quartz in color from yellow to bright yellow-orange, and can find application in the jewelry industry, especially for jewelry stones with the most popular color, characteristic of the Topaz is called Imperial, and quartz-Citrine", as well as coloring pink sapphires in reddish-or the walls the way of colouring Topaz in a variety of colors (from blue to dark blue, reddish-brown, smoky) under the influence of ionizing irradiation by neutrons, high energy electrons and gamma-rays, sometimes in combination with a subsequent heat treatment at a temperature of 300-400o(See the book: Kurt. Nasau "Gemstone Enhansement: History, Science and State of the Art", (1994), Butterworth - Heinemann LTD, Oxford, 2nd ed., pp. 32-54, pp. 187-194).

However, it is not possible to paint the Topaz in the most valuable for this gem stone yellow and orange.

There is a method of dyeing crystals of corundum, including orange, according to which on the stone surface by sputtering put iron in metallic form with subsequent thermal treatment in oxygen atmosphere at a temperature of 1000-1300oC for 0.5 to 2.0 hours (Patent RU 2036984, CL 30 In 31/02, And 44 With 17/00, publ. 09.06.95 year).

However, wide application of this method for coloring other gemstone jewelry limited high temperature heat treatment, causing, for example, in the case of dyeing Topaz, irreversible decomposition of the latter with the release of fluoride and water and the formation of new fine crystalline phase of mullite. In addition, many stones, such as quartz, when processed at such high temperatures are of intensive the finding solves the problem of development of technology of dyeing a large class of natural and synthetic gemstones, the technical result is to obtain a stable reproducible color in a wide range of colors from yellow to bright yellow-orange to paint the colorless gemstone jewelry, as well as a diverse range of colors when the color of the gemstones.

The technical result is achieved in that in the method of dyeing natural and synthetic gemstones, comprising applying to the surface layer of iron with a subsequent heat treatment in an atmosphere of oxygen, according to the invention the heat treatment is carried out in three stages: heating, exposure and cooling, and heating and cooling are at a maximum speed of 5oC/min, and the extract is carried out at a temperature of 600-1000oC.

The selected treatment mode is determined by the fact that at temperatures below 600oWith the chemical reaction with reproducible stable coloration gemstone jewelry in yellow color does not occur, and above 960oWith, in the case of Topaz, on the surface of the painted stone appear opaque inclusions is the result of thermal decomposition, and in the case of quartz, the latter is subjected to intense fracturing. The speed limit heating and ochlajdenniy cleavage and low thermal conductivity.

To obtain a smooth painted surface, which does not require subsequent polishing, deposition of films of iron is carried out by the method of RF diode sputtering in the argon plasma.

Most high-quality color obtained when the deposition of iron films with thickness from 0.50 to 300 nm.

The most consistent and repeatable color obtained when implementing the exposure during the heat treatment within 1-5 hours

The shutter speed in the heat treatment Topaz optimally carried out at a temperature of 600-960oC.

The shutter speed when heat-treated sapphire optimally carried out at a temperature of 600-1000oC.

The shutter speed when heat-treated quartz optimally carried out at a temperature of 600-800oC.

The intensity of color gemstone jewelry can be varied by changing how the thickness of the sprayed metal and the treatment is in the claimed range.

Example 1.

You take the polished box jewelry made of Topaz. The deposition of the film iron is carried out by the method of RF diode sputtering in a plasma of argon in the temperature range from 20 to 300oC. Pressure Hypertension was ~1 PA (10-2Topp). Film thickness is controlled with the help of oC/min up to 600oC in an atmosphere of oxygen, and then kept at this temperature for 5 h and cooled at a speed of 5oC/min to room temperature.

The resulting sample has a uniform pale yellow color and does not require additional polishing.

Example 2.

Same as in example 1. Just put a layer of iron with a thickness of 300 nm, insert Topaz is heated at a speed of 5oC/min up to 960oC, kept at this temperature for 3 h and then cooled with a speed of 0.1oC/min, the sample Obtained has a uniform bright orange color and does not require additional polishing.

Example 3.

Same as in example 1, but the thickness of the layer of iron is 0.4 nm, the heat conducting a speed of 0.1oC/min, stage extracts the heat treatment is carried out at a temperature of 970oAnd cooling carried out with a speed of 6oC/min, the result is the insertion of Topaz with numerous cracks with a barely noticeable yellow color.

Example 4.

Same as in example 3, but the thickness of the layer of iron is 300 nm, the heating rate 6oC/min, holding temperature 500oWith the cooling rate of 0.05oC/min, the result is not">

Example 5.

Same as in example 2, but the thickness of the deposited layer of iron is 320 nm. The result is a sample of bright orange color with distinct opalescence, making it unsuitable for use in jewelry.

Example 6.

Jewelry box pink sapphire covered with a layer of iron by RF diode sputtering in a plasma of argon at room temperature. Film thickness is controlled by using the thickness is 50 nm. After deposition, the insert is placed in a furnace and heated at a speed of 5oC/min to 900oC in an atmosphere of oxygen, and then kept at this temperature for 2 h and cooled with a speed of 3oC/min to room temperature. The resulting sample has a uniform reddish-orange color, similar to the one of the most valuable varieties of sapphire, padparadscha.

Example 7.

Same as example 6, only the sample is heated at a speed of 5oC/min up to 1000oC. the resulting sample has a uniform reddish-orange color and does not require additional polishing.

Example 8.

Same as in example 7, but the heating of the sample spend a speed of 0.1oWith rpm, you is a reddish-orange color.

Example 9.

Jewelry box made of colourless quartz covered by RF diode sputtering in a plasma of argon at room temperature. Film thickness is controlled by using the thickness is 50 nm. After deposition, the insert is placed in a furnace and heated at a rate of 1oC/min up to 600oC/min under oxygen atmosphere, and then kept at this temperature for 5 h and cooled with a speed of 0.1oC/min to room temperature. The resulting sample has a uniform yellow color, similar to the colored varieties of natural iron-bearing quartz - citrine. The sample does not require additional polishing.

Example 10.

Same as in example 9, only the sample is heated at the rate of 1,5oC/min to 800oC for 3 h and cooled with a speed of 0.1oC/min, the sample Obtained has a uniform bright yellow color and does not require additional polishing.

Example 11.

Hour colorless glass covered by RF diode sputtering in a plasma of argon at room temperature. Film thickness is controlled by using the thickness is 40 nm. After deposition, the glass is placed in a furnace and heated at the rate of 2oC/min to room temperature. The resulting sample has a uniform bright yellow color and does not require re-polishing.

Thus, the processed offer by way of natural and synthetic stones have uniform color coverage with a given reproducible color intensity and do not require additional polishing for later use.

1. Method of dyeing natural and synthetic gemstones, comprising applying to the surface layer of iron and subsequent heat treatment in oxygen atmosphere, wherein the heat treatment is carried out in three stages: heating, exposure and cooling, and heating and cooling are a speed of 0.1-5oC/min, and the extract is carried out at a temperature of 600-1000oC.

2. The method according to p. 1, characterized in that the deposition of films of iron is carried out by the method of RF diode sputtering in the argon plasma.

3. The method according to p. 2, characterized in that the deposition of films of iron is carried out to a thickness of from 0.50 to 300 nm.

4. The method according to p. 1, characterized in that the shutter speed when the heat treatment is carried out for 1-5 hours

5. The method according to p. 1, characterized in that the shutter speed t is the shutter speed when heat-treated sapphire is carried out at a temperature of 600-1000oC.

7. The method according to p. 1, characterized in that the shutter speed when heat-treated quartz is carried out at a temperature of 600-800oC.

 

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