The method of coloring corundum


(57) Abstract:

Use: treatment of precious stones for the jewelry industry. The method includes mechanical polishing corundum, drawing on his metal film capable of spinlooptime, and heat treatment at 1000 - 1300C in oxygen atmosphere for 0.5 to 2.0. During the deposition process using appropriate screens and the process is carried out repeatedly on one or more areas of the oxide of one or more of various metals. Get polychromatic color and set the color picture. During the deposition of cobalt and iron using a screen mesh obtained corundum with mesh distribution of intense blue and orange colors. table 1.

The invention relates to a method of processing precious stones, in particular to a method of coloring oxide, and may find application in the jewelry industry.

The closest technical solution adopted for the prototype, is a method of dyeing corundum [1] According to this method, crystals of corundum polished, conduct coated metal capable of spinlooptime with corundum. Terminating operation of the solid-phase synthesis method in an atmosphere of oxygen at a temperature of the predetermined color pattern corundum products.

To achieve the turn of the known method, including polishing corundum, the coated metal film capable of spinlooptime with corundum, and solid-phase synthesis in an oxygen atmosphere at a temperature of 1000-1300aboutWith the deposition of the metal film is conducted multiple times; and to obtain specified color picture using appropriate screens, and solid-phase synthesis is carried out for 0.5-2 hours

Comparative analysis of the proposed solutions with the prototype shows that the method is distinguished by the conditions of deposition and solid-phase synthesis: a repetition, the use of screens, the duration of the synthesis. Thus, the proposed solution meets the criterion of "novelty."

Comparison of the proposed method not only prototype, but also with other known solutions in this field of technology (certificate of patent study) shows that the features distinguishing the claimed invention from the prototype, were not discovered, and because they provide the claimed technical solution according to the criterion of "significant differences".

The method is implemented as follows.

Corundum after polishing is placed in an installation for spraying and paste spraying carried out repeatedly, and to form a colored pattern using respective screens of a given configuration. After deposition, the samples are placed in a reactor, heated to a temperature of 1000-1300aboutC in an atmosphere of oxygen and incubated for 0.5-2 hours depending on the temperature of synthesis.

Examples of specific implementation of the method presented in the table.

The choice of conditions and the optimal parameters of the process due to the following.

Multiple coating has the effect of drawing on one or more areas of the oxide of one or more of various metals capable of oxygen in the atmosphere to the formation of the corresponding spinel. Multiple coating also allows you to enter in the composition of the deposited metal film chromophore elements that cause the manifestation of one or another color. The use of screens of a given configuration can generate a desired image or pattern.

The selected time interval and temperature of synthesis is determined by the fact that at a temperature of 1000aboutWith time and annealing 2 hours and the colour intensity reaches its maximum. At the time of annealing is less than or greater than 2 h, the colour intensity falls: in the first case due to incompletely ask the 1300aboutCan be achieved for 0.5 hours At a smaller or larger time annealing the colour intensity is reduced for the reasons mentioned above.

The effectiveness of the proposed method consists in obtaining a wide range of colored corundum suitable for use in the jewelry industry.

The METHOD of COLORING CORUNDUM, including mechanical polishing, application of a metal film capable of spinlooptime with corundum, and heat treatment at 1000 to 1300oC in an atmosphere of oxygen, characterized in that, in order to obtain polychromatic coloring and given a color picture, sputtering is conducted iteratively, using appropriate screens, and heat treatment is conducted for 0.5 to 2.0 hours


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