Micro Milling for Functional Surface

A beam of ions of mass greater than a few atomic mass units and with sufficient energy can remove atoms from the surface of a solid material at a useful rate. A system used to achieve this purpose under controlled atmospheres is called an ion miliing machine. An ion milling apparatus presently available as IMMI-III with a IMMIAC was used in this investigation. Unless otherwise stated, all the micro milling operations were done with Ar+ at 6kv using a beam current of 100 μA for each of the two guns, with a specimen tilt of 15° from the horizontal plane.It is fairly well established that ion bombardment of the surface of homogeneous materials can produce surface topography which resembles geological erosional features.

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Alendronate Stimulates Expression of Functional Surface Molecules ICAM-1, HLA-DR, and B7-2 on Human Monocytes

Osteologie/Osteology ◽

10.1024/1019-1291.15.3.188 ◽

2006 ◽

Vol 15 (03) ◽

pp. 188-196

Author(s):

S. Brosch ◽

M. Shehata ◽

G. Hofbauer ◽

M. Peterlik ◽

P. Pietschmann

Keyword(s):

Human Monocytes ◽

Functional Surface ◽

Surface Molecules ◽

Hla Dr

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Chemical deposition of hard composite coatings Ni–Cu–P–Cr2O3

10.36652/1813-1336-2020-16-4-179-181 ◽

2020 ◽

pp. 179-181

Author(s):

A.A. Abrashov A.A. ◽

E.G. Vinokurov ◽

M.A. Egupova ◽

V.D. Skopintsev

Keyword(s):

Chromium Oxide ◽

Alkaline Solution ◽

Composite Coatings ◽

Chemical Deposition ◽

Alkaline Solutions ◽

Functional Surface ◽

Heat Treated ◽

Weakly Acid Solution ◽

Coating Composition ◽

Weakly Acidic Solution

The technological (deposition rate, coating composition) and functional (surface roughness, microhardness) characteristics of chemical composite coatings Ni—Cu—P—Cr2O3 obtained from weakly acidic and slightly alkaline solutions are compared. It is shown that coatings deposited from slightly alkaline solution contain slightly less phosphorus and chromium oxide than coatings deposited from weakly acid solution (2...3 % wt. phosphorus and up to 3.4 % wt. chromium oxide), formed at higher rate (24...25 microns per 1 hour of deposition at temperature of 80 °C), are characte rized by lower roughness and increased microhardness. The Vickers microhardness at 0.05 N load of composite coatings obtained from slightly alkaline solution and heat-treated at 400 °C for 1 hour is 13.5...15.2 GPa, which is higher than values for coatings deposited made of weakly acidic solution. The maximum microhardness of coatings is achieved at concentration 20 g/l of Cr2O3 particles. The technology of chemical deposition of Ni—Cu—P—Cr2O3 coatings formed in slightly alkaline solution is promising for obtaining of materials with increased hardness and wear resistance.

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Stoichiometric composition of thin-film surface structures and its influence on the functional characteristics as regards gyroscopic devices

Voprosy Materialovedeniya ◽

10.22349/1994-6716-2019-100-4-78-90 ◽

2020 ◽

pp. 78-90

Author(s):

M. A. Tit ◽

S. N. Belyaev

Keyword(s):

Thin Film ◽

Titanium Nitride ◽

Niobium Carbide ◽

Structural Phase ◽

Stoichiometric Composition ◽

Film Surface ◽

Surface Structures ◽

Functional Surface ◽

Base Surface ◽

Thin Film Surface

This article considers the research results of the effect of stoichiometry on the properties of titanium nitride thin-film coatings of the float and electrostatic gyroscopes. It presents the results of tests of such mechanical and optical characteristics of titanium nitride thin-film structures as microhardness, resistance to wear and friction, and image contrast determined by the reflection coefficients of a titanium nitride base surface and a raster pattern formed by local laser oxidation. When making a rotor of a cryogenic gyroscope, the prospects of use and technological methods for the formation of functional surface structures of niobium carbide and nitride are considered. It is shown that during the formation of coatings of the required composition, the most important is the thermodynamic estimation of possible interactions. These interactions allow us to accomplish the structural-phase modification of the material, which is determined by the complex of possible topochemical reactions leading to the formation of compounds, including non-stoichiometric composition.

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