Thermoregulating coating of "sollar reflector" type

FIELD: transportation.

SUBSTANCE: proposed coating includes a lower layer of an aluminum alloy anodic oxide coating and an upper layer representing a thermo regulating paint coat comprising acrylate holmium-containing vanish "АКГ-1,2" (42-38 percent by weight) and oxide-modified zirconium (IV), 7-4 (58-62 percent by weight). The coating features low solar radiation absorption factor values (As ≤ 0,10-0,11) and high radiation factors (ε≥0,92-0,94). This allows reducing the radiator-emitter area which is particularly important in development of promising spacecrafts. Availability of two thermoregulating coatings, i.e. the anodic oxide and paint coatings allows a notable increase in service life of the said radiators and producing the said coatings on the surface of products made from aluminum or its alloys with lower As/ε parameter values and without drawbacks inherent in silicate coatings.

EFFECT: antirust protection of complicated-design structures and provision of preset thermal-and-radiation characteristics.

2 tbl

 

The invention relates to the field of space science, namely, the temperature-controlled coating-class "solar reflectors".

At high values of the coefficient of absorption of solar radiation (As) to increase the area of the reflecting surfaces of the products, increase overall mass and reduced mass of the payload. Therefore, to optimize system passive thermal control of space vehicles require coatings with low values of Asand high values of emissivity ε.

In thermal systems provide the most preferred is the use of thermal control andlooking coatings on aluminum and its alloys because of their small thickness and, consequently, low weight. Being one-piece with aluminum base, they don't break away even from the effects of space debris, and provide protection from corrosion in terrestrial conditions and fully resistant to erosion from atomic oxygen in contrast to inorganic and organic coatings. However, the initial values of their thermo-radiating characteristics are quite large.

Closest to the proposed expansion of the coating to the technical essence is thermostatic coating (U.S. Patent No. 5296285 of March 22, 1994), a two-layer covered with the e, formed by creating a first layer by anodic oxidation of the aluminum substrate and applying a second upper layer consisting of silicate coating Z-93. The coating has the following characteristics: As≤0,15-0,20, ε≥from 0.90 to 0.92.

Such high initial values of the absorption coefficient Asrequire placement on space objects additional space radiators, cooling for heat relief. In addition, the silicate coating of the upper layer of the above composition has a number of technological limitations inherent to the whole class silicate coatings relative fragility, lack of elasticity, the complexity of the application.

The technical purpose of this invention is the development of thermal management coatings with low absorption capacity of solar radiation and high emissivity on aluminum and its alloys without flaws silicate coatings.

This task is solved in that the temperature-controlled coating-class "solar reflectors, including the lower layer andlooking coating on aluminum alloys and the top layer, wherein the upper layer is used to paint thermostatic coating containing acrylate holinesterzoy lacquer ACG-1.2 and zirconium (IV) oxide modified OSC-4 in the following ratio of components, wt.%:

zirconium (IV) oxide modified58-62
lacquer ACG-1,242-38

The lower layer of the temperature-controlled coating-class "solar reflectors formed by applying a temperature-controlled andlooking coating (anodic oxide) on the samples of the alloy AMG after pre-treatment (degreasing, pickling, rinsing, polishing). Anodizing was performed in a solution of 18% sulfuric acid at a voltage of 12-15 volts, while the current density was maintained in the range of 0.8-1.2 a/DM2at a temperature of 18-20°C for 30 minutes followed by rinsing and filling the tub with hot deionized water at a temperature of 90-95°C for 15 minutes. The values of the coefficients amounted to As≤0,33, ε≥0,80. On the anodized surface of the samples was applied paint thermostatic based coating varnish ACG-1.2 and pigment zirconium (IV) oxide modified. For the preparation of compositions of the necessary quantity of zirconium (IV) oxide modified silicic acid water (mass fraction of modifier - 2%), high purity beyond 2611-269-00209792-2003 and varnish ACG-1,2 beyond 2313-001-07545731-2005, physico-mechanical parameters of which are given in table 1 were loaded into a porcelain drum soo is wearing porcelain balls:pigment = 1:1 (by weight) and mixed on a roller mill 60-90 minutes Then the resulting mixture was filtered through a nylon mesh. The coating was applied by spray gun. The drying was carried out at room temperature.

Values of thermo-radiating characteristics of the temperature-controlled coating based on anodic oxide paint composition was: As≥0,10-0,11, ε≥0,92-0,94.

Table 1
Name of indicatorThe norm for varnish ACG-1,2
1. The appearance of the lacquerTransparent homogeneous liquid without mechanical impurities
2. Color by iodine scale, mg I2/100 cm3not darker3
3. Viscosity of the varnish on viscosimetry type VZ-246 with the nozzle diameter of 4 mm at a temperature of from 19.5 to 20.5°sfrom 13 to 22
4. Mass fraction of non-volatiles, %from 19 to 22
5. Acid number water extract, mg KOH, no more than0,1
6. The content of the modifier in the dry residue in terms of triacetyluridine holmium, % (by wt.)from 1.15 to 1.25
7. The drying time of the lacquer to the point 3 at a temperature of from 18 to 22°C, h, no more than2
8. Appearance plank the lacquer Smooth colorless homogeneous surface without winced and mechanical inclusions
9. The hardness of the film, conventional units, not less, by pendulum device:
type M-30,5
type TML (pendulum a)0,45
10. The elasticity of the film bending, mm, not more than1
11. The resistance of the film to static action of water at a temperature of from 18 to 22°C, h, not less than4
12. The resistance of the film to static action of nefras at a temperature of from 18 to 22°S, min, not less than1

Table 2 shows the values of thermo-radiating characteristics (TPX) thermal control coatings "class solar reflectors in various grades of aluminum alloy.

Table 2
Brand aluminum alloyModes anodizingInitial values TPX after anodizingInitial values TPX after coatingNote
Asnot more thanεnot less thanAsnot more than; not less than
AMg6the current density of 0.8 a/DM2temperature 17°, 15 minutes0,22-0,270,75-0,790,10-0,110,92-0,93Technology coating in all cases the same. Coating smooth, white, uniformly distributed on the sample surface.
AMGthe current density of 0.8-1.2 a/DM2temperature 18°C, 18 min0,33-0,380,74-0,800,11-0,120,93-0,94
AD31the current density 1-1,2 a/DM2temperature 18°time 20 minutes0,21-0,230,79-0,800,10-0,110,94

As can be seen from table 2, for the proposed expansion of the coverage of the class "solar reflectors" achieved high initial values of thermo-radiating characteristics of As≤0.10 to 0.11 and ε≥0,92-0,94 instead of As≤0,15-0,20, ε≥from 0.90 to 0.92.

The use of the claimed invention will:

- cut square hinged radiator cooling by reducing the initial value of the coefficient of solar absorption Asand increase the emissivity ε;

- to extend the period of operation of the radiator cooling due to the presence thermoregulate the corresponding anodic oxide after a possible failure of the top layer of the coating from exposure to atomic oxygen.

The temperature-controlled coating-class "solar reflectors", which includes the lower layer in the form of anodic oxide coatings aluminum alloy and an upper layer, wherein the upper layer used paint thermostatic coating containing acrylate holinesterzoy lacquer ACG-1.2 and zirconium (IV) oxide modified OSC 7-4 in the following ratio, wt.%:

Zirconium (IV) oxide modified58-62
Lacquer ACG-1,242-38



 

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