The charge for growing single crystals of corundum

 

(57) Abstract:

The invention relates to the growing of single crystals of corundum blue-green range of colors and can be used in the jewelry industry. Charge on the basis of aluminum oxide contains coloring additives of cobalt, vanadium, magnesium, manganese, Nickel, iron and aluminum fluoride in the following ratio, wt. based on aluminum oxide: cobalt 0,1000 2,5000; vanadium 0,0001 0,6000; magnesium 0,0001 0,0035; manganese 0,0001 0,0500; Nickel 0,0001 0,6000; iron 0,0001 - 0,6000; aluminum fluoride 1,0000 20,0000; alumina rest. The crystal is grown by the Verneuil method and annealed in vacuum and oxygen atmosphere. table 1.

The invention relates to compositions of mixture for growing synthetic crystals of corundum blue-green palette color for use in the jewelry and watch industry, but also in other areas where required colored crystals of corundum. Known mixture for growing single crystals of corundum blue-green palette color containing cobalt and aluminum fluoride [1]

Closest to the technical nature of the invention is a composition for growing single crystals of corundum green color gamut based on the hydroxy is advancing the single crystals of corundum, with shades in a wide range of blue-green palette color. This is achieved by introducing into the mixture an additional coloring admixtures of magnesium, manganese, Nickel, iron and aluminum fluoride in the following ratio of components (wt. based on aluminium oxide):

Cobalt 0,1000-2,5000

Vanadium 0,0001-0,6000

Magnesium 0,0001-0,0035

Manganese 0,0001-0,0500

Nickel 0,0001-0,6000

Iron 0,0001-0,6000

The aluminum fluoride 1,0000-20,0000

Alumina Rest.

To improve the quality of the charge of coloring impurities are introduced in the form of a solution of salts containing the same anion with a basic substance that provides more uniform dispersion powder composition.

P R I m m e R. In alumo-ammonium alum "OFS", "z h", "analytical grade" or "h" is entered coloring impurities in the form of solutions of sulfate salts in the amounts indicated in the table, in terms of elements. After stirring the mixture is put in a quartz bowl and fired in a chamber furnace for 1.5-2 h at 1120-1150aboutC. a Powder of aluminum oxide with coloring admixtures sieved through a sieve with the mesh size of the 605 μm. From the resulting powder by the method of Verneuil crystals were grown.

Intervals coloring admixtures were selected rodit to obtain an almost colorless crystals, and the upper limit is due to the fact that further increase in the content of impurities leads to cracking of the crystals and reduce the yield of crystals.

Temperature range of the firing of the charge 1120-1150aboutTo ensure complete decomposition of the starting compounds and the formation of aluminum oxide with coloring impurities. At temperatures below 1120aboutWith powder of aluminum oxide contains a significant amount of anion SO32-tenths of a percent), which leads to the formation of single crystals of the bubbles. At temperatures above 1150aboutWith deteriorating dispersion powder composition of aluminum oxide, which leads to the formation of neprapuwju.

After growing crystals may be subjected to oxygen and vacuum-oxygen annealing in order to intensify the color, produce new kinds of painting, removing pokerstove stress. For stress relieving the crystals are subjected to heat treatment in vacuum at 510 mm RT.article within 24 h at 190020 s TIG single crystals of corundum oxygen is carried out at 150050 WITHaboutwithin 24 h, and helps to intensify the color of corundum.

The CHARGE FOR GROWING single CRYSTALS of CORUNDUM green palette color meth is that additionally contains a dye in the blue-green range of supplements of magnesium, manganese, Nickel, iron and aluminum fluoride in the following ratio, wt. based on aluminum oxide:

Cobalt 0,1 2,5

Vanadium 0,0001 0,6

Magnesium 0,0001 0,0035

Manganese is 0.0001 to 0.05

Nickel 0,0001 0,6

Iron 0,0001 0,6

The aluminum fluoride 1 20

Alumina Rest

 

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