Fabrication of Porous Tantalum and Tungsten Black Coatings for Artificial Earth Satellites

Tuleushev, Yu. Zh.; Володин, В. Н.; Жаканбаев, Е. А.; Suslov, E. E.; Kerimshe, A. S.

doi:10.1134/s1063785020040148

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…Ta coating synthesis parameters was follow: plasma-forming gas-argon, residual gas pressure in the working chamber-3 × 10 −5 Pa, distance from target to substrate 50 mm. The technique for synthesizing coatings is described in detail elsewhere [35,37] The purpose of this work is the synthesis of tantalum coating in the α-Ta structural state by magnetron sputtering without subsequent heat treatment. To achieve this goal the power on magnetron and time of coating application were varied.…”

Section: Experimental Methodsmentioning

confidence: 99%

Formation of tantalum coatings with a given structure on the surface of niti alloy by magnetron sputter deposition

Akayev¹

2022

Funct. Compos. Struct.

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Way for applying tantalum coating with a given structure to the surface of an alloy with a shape memory effect NiTi to increase the biocompatibility of implants from this alloy is presented. The coating was synthesized by DC-magnetron sputtering. The changes sequence of the structural-phase states depending on the thickness of the coating, that is, the rate of its deposition, has been established. It is shown that at a low magnetron power, ~ 14 W in present study, a single-phase α-Ta coating with a bcc structure and a high degree of perfection of the crystal lattice is successfully synthesized on the titanium nickelide surface.

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Section: Experimental Methodsmentioning

confidence: 99%

Formation of tantalum coatings with a given structure on the surface of niti alloy by magnetron sputter deposition

Akayev¹

2022

Funct. Compos. Struct.

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“…Based on the principle that the optical system can correct aberration and the simple structure, the aperture stop of this system is optimized and placed on the left surface of the second lens, as shown in Figure 11, which can effectively suppress some stray light scattered in the front part of the system and achieve the best suppression effect. Also, the "critical surface" needs to be sprayed black or increase the surface roughness and other processes to ensure that its absorption rate is above 90%, which is conducive to reducing the illumination of stray light on the image surface [46], [47].…”

Section: Figure10 Structural Diagram Of Cylindrical Gradient Arrangem...mentioning

confidence: 99%

Study on Stray Light Testing and Suppression Techniques for Large-Field of View Multispectral Space Optical Systems

Lu,

Xu,

Zhang

et al. 2024

IEEE Access

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To evaluate the ability of space optical systems to suppress off-axis stray light, this paper proposes a stray light testing method for large-field of view, multispectral spatial optical systems based on point source transmittance (PST). And a stray light testing platform was developed using a high-brightness simulated light source, large-aperture off-axis reflective collimator, high-precision positioning mechanism and a double column tank to evaluate the stray light PST index of spatial optical system. On the basis of theoretical analyses, a set of calibration lenses and stray light elimination structures such as hoods, baffle and stop are designed for the accuracy calibration of stray light testing systems. The theoretical PST values of the calibration lens at different off-axis angles are analyzed by Trace Pro software simulation and compared with the measured values to calibrate the accuracy of the system. The testing results show that the PST measurement range of the system reaches 10 -3 ~10 -10 when the off-axis angles of the calibration lens are in the range of ±5°±60°. The stray light test system has the advantages of wide working band, high automation and large dynamic range, and its test results can be used in the correction of lens hood and other applications.INDEX TERMS Multi-spectrum, large-field view, stray light, point source transmittance (PST), lens hood

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Fabrication of Porous Tantalum and Tungsten Black Coatings for Artificial Earth Satellites

Cited by 2 publications

References 2 publications

Formation of tantalum coatings with a given structure on the surface of niti alloy by magnetron sputter deposition

Formation of tantalum coatings with a given structure on the surface of niti alloy by magnetron sputter deposition

Study on Stray Light Testing and Suppression Techniques for Large-Field of View Multispectral Space Optical Systems

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