Dyestuff for production of refractory paint

FIELD: production of refractory paints (molded and non-molded) at roasting temperature up to 1550°C; marking articles before and after heat treatment.

SUBSTANCE: proposed dyestuff contains the following components, mass-%: titanium dioxide, 30-75; chromium oxide, 5-50 and cobalt aluminate, 5-40. Components taken at definite ratio (mass-%) make it possible to obtain dyestuff for marking the articles inclusive those working at high temperatures and keeping marks intact during operation at temperature up to 1550°C and at thermo-cycling of marked articles.

EFFECT: enhanced efficiency and reliability.

3 ex

 

The invention relates to the technology of manufacture of refractory products (shaped and unshaped) with firing temperatures of up to 1550°and can be used for marking workpieces of such products before heat treatment and after it.

Known ceramic paint composition containing iron oxide of 45.4%, chromium oxide with 43.2%, cobalt oxide - 11,4% (But, Assurini, Iaalay and other Technology of ceramics and refractories. M., 1962, s-526), is similar.

The disadvantage of this paint is the dissociation Soo at high temperature firing (1410° (C) the oxide of cobalt and oxygen, which violates the integrity of the paint (special paint), and, in addition, at high temperatures in the paint are formed of low-melting compounds, and it spreads on the surface of the product.

Also known composition of the heat-resistant paints, including ABFS (lumbricidae binder), silicon dioxide, kaolin, inorganic pigment and water (USSR author's certificate No. 706428, VRB C 09 B 1/00, 1978) is similar.

The disadvantages of this structure is that it has limited scope and is suitable only for use on products that have rough surfaces with significant porosity, such as asbestos-cement products, and, in addition, the composition after application to the surface long dries and forms not waterproof ocrite due to the low heat treatment temperature.

Known composition of the heat-resistant paints for application to metallic and non-metallic products, including titanium dioxide, magnesium oxide, silicon dioxide, aluminum hydroxide, calcium carbonate and allmoviephoto binder in the following ratio of components: titanium dioxide 9,0-31,4, magnesium oxide is 0.4 to 2.3, silicon dioxide 1,6-4,8, aluminum hydroxide, 0.1 to 1.0, calcium carbonate 0.3 to 3.1 and allmoviephoto binding - rest (MCI: RF patent №2098441, C 09 D 1/00, C 09 D 5/18, BI No. 34 of 1997) prototype.

The disadvantage of this composition is low resistance and inability to use it for products, working in conditions of thermal Cycling.

The technical result, which is aimed by the invention is the creation of a coloring of the heat-resistant paints, in particular for product labelling, including working in high temperature environments, with the ability to store its products in operating conditions up to a temperature of 1550°and with thermal Cycling products labeled. To achieve the technical result of the coloring composition to obtain a heat-resistant paints, including chromium oxide and titanium dioxide, optionally contains cobalt aluminate in the following ratio, wt.%: titanium dioxide - 30-75, a chromium oxide - 5-50 and cobalt aluminate is - 5-40.

To prepare the dye composition applied the following source materials: titanium dioxide white pigment brand RO-2, GOST 9808-84, chromium oxide technical (resistant silicate melts), GOST 2912-79, the synthesized cobalt blue to cobalt aluminate, and to ensure the application of the coloring composition to the product, it must be combined with a binder, and the binder may be used, for example, water or alcohol and therefore marking paint composition may represent, for example, an aqueous solution or alcohol solution of these components of a certain consistency, which depends on the type of material on which the paint is applied, and the products (products can be freshly formed, dried, burned, with fine-grained or coarse-grained structure, porous or porous), the temperature of the subsequent firing and other terms, which will be the product with the mark of the inventive paint.

Optimal results will be achieved when the paint (the claimed composition with a binder) has the consistency of cream or sour cream, i.e. the consistency of the paint should ensure that the marking of products using brushes No. 1-5, and select the number of the brushes depends on the desired thickness of the marking and the state of overhelmingly. Labelling should be clear boundaries, and the paint should not penetrate deeply into the product, which is especially important for products with thin walls, such as melting crucibles.

Because all raw materials are fine, i.e. with a particle size less than 10 μm, they are not shredded and spend the dry mixture in a porcelain or other types of mills in arbitrary sequence of components, and then the resulting mixture is combined with a binder, such as water.

By the applicant were conducted theoretical and experimental studies of the proposed composition of the paint, in which it was found that the increase in the number of separately titanium dioxide and separate cobalt aluminate compared with the proposed structure increases the baking layer of paint and its penetration into the product, and therefore decreasing the amount of titanium dioxide or cobalt aluminate reduced adhesion of the paint with the product.

The chromium oxide is introduced into the paint composition to increase the strength of the colored layer, increased intensity of staining, as well as improve the viscosity of the paint. Moreover, the increased content of chromium oxide in the paint causes its evaporation from the labeling and appearance of the product residue or an "aura" about marking associated with the reaction of the ink with the surface of the product, and reducing the number of chromium oxide causes a decrease in the intensity of the color marking and reduces its strength on the product.

In addition, the applicant has established that the quality of marking in the clarity and brightness is higher if you put it on the burned product, such as a fireproof box for high-temperature ceramics firing tunnel kiln.

It is necessary to consider that the presence of a common defect-metallization, drastically reducing the quality of the marking depends on the redox conditions of firing. Optimum results when using the inventive inks were obtained in the temperature range from 1000°C to 1550°C. When the firing temperature less than 1000°erases paint with the product, and at a temperature of more than 1550° - deterioration in the quality of marking (the vagueness of the path).

Below are examples of specific use of the inventive inks for various products.

Example 1. You want to mark raw billet products with fine-grained, smooth surface, such as products from fine-grained oxide.

Prepare a mixture of the ingredients of the paint in the following ratio, wt.%: TiO2- 30,0, Cr2O3- 30,0, CoAl2O4- 40,0. After dry mixing, the mixture was added water in an amount of 56% over 100 ready-to-use paint has the consistency of thick cream. This dye is applied to the workpiece tassel No. 1-3 with a subsequent heat treatment temperature is 1550° C. marking Colour lilac with greens. The brightness and clarity of marking is good and is maintained during repeated thermal Cycling (more than 200 cycles at a specified temperature).

Example 2.

You want to mark raw billet products with medium and coarse porous surface, such as refractory crucibles from moltocarina or fused magnesia for melting metals.

Prepare a mixture of the ingredients of the paint in the following ratio, wt.%: TiO2- 50,0, Cr2O3- 35,0, CoAl2O4- 15,0. After stirring 66% of water in excess of 100, the paint has the consistency of liquid cream. This dye is applied with a brush No. 3-4, after which the product is fired to a temperature of 1550°S. Colour - pinkish-purple with a blue tint. The brightness and clarity of marking is satisfactory and is maintained during repeated thermal Cycling (more than 200 cycles at a specified temperature).

Example 3.

You need to apply paint on a fire, baked goods with a rough surface, for example mullitokorundovye glasses for firing ceramic rods.

Prepare a mixture of the ingredients of the paint in the following ratio, wt.%: TiO2- 75,0, Cr2O3- 10,0, CoAl2O4- 15,0. After dry mixing, add 80% of water in excess of 100, the paint has the consistency of cream (paint Capa is t from the end of the brush). This dye is applied with a brush No. 2-4. Put paint is attached to the product in the subsequent firing to a temperature of 1380°S. Colour - lilac-green with a brownish tinge. The brightness and clarity of marking is satisfactory and is maintained during repeated thermal Cycling (more than 300 cycles at the same temperature).

Coloring composition to obtain a heat-resistant paints, including chromium oxide and titanium dioxide, characterized in that it further contains cobalt aluminate in the following ratio, wt.%:

Titanium dioxide30-75
The chromium oxide5-50
Cobalt aluminate5-40



 

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