Porous light-absorbing and thermoregulating low-vacuum aluminum coatings (AC) precipitated by thermal evaporation were the object of this study. The small-angle X-ray scattering (SAXS), electron microscopy, precision hydrostatic weighing, and the dynamical technique for argon low-temperature desorption were used for our investigations. It was shown that AC pore formation in open space (OS) is conditioned by the reduction of molecular flow orienting impact and the increase of the diffusing-vacancy mechanism on coatings formation in zero-gravity conditions, which causes the formation of coarse and equiaxed pores with lowered polydispersity levels.
References
[1]
Goueffon, Y.; Arurault, L.; Mabru, C.; Tonon, C.; Guigue, P. Black anodic coatings for space applications: Study of the process parameters, characteristics and mechanical properties. J. Mater. Process. Technol. 2009, 209, 5145–5151.
[2]
Sharma, A.K.; Bhojraj, H.; Kaila, V.K.; Narayanamurthy, H. Anodezing black coloring of aluminium alloys for space applications. Metal Finishing 1997, 12, 14–20.
[3]
Palatnik, L.S.; Nikitskiy, V.P.; Cheremskoy, P.G.; Tartakovskaya, I.H.; Svechkin, V.P.; Kovaleva, O.I.; Zukov, G.V. Structure peculiarities and porosity of the aluminium polycristalline vacuum condensates. Sov. J. Physics Metals 1978, 45, 1205–1212.
Skatkov, L.I.; Cheremskoy, P.G.; Gomozov, V.P.; Bayrachny, B.I. Investigation of the solid surface structural inhomogeneities by the “combined” small-angle X-ray scattering and Hg porosimetry methods. Appl. Surf. Sci. 1996, 99, 367–370.
[6]
Po-zen, W. Scattering by inhomogeneous systems with rough internal surfaces: Porous solids and random-field Ising systems. Phys. Rev. B 1985, 32, 7417–7424.
[7]
Palatnik, L.S.; Nikitskiy, V.P.; Tartakovskaya, I.H.; Cheremskoy, P.G.; Riabuha, S.B.; Dudkin, V.A.; Pusan, V.I.; Borodkina, M.A. Influence of the open space factors on the substructure and optical properties of the light-absorbing thermoregulating coatings. Russ. J. Surface Phys. Chem. Mechanics 1994, 1, 55–63.
