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Glossary of MinSE


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C

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The chemical compatibility of a coating with respect to its substrate. This quality is essential, particularly for high temperatures service, e.g., for coatings that provide oxidation protection for nickel alloy turbine blades.
flag Bevonat kompatibilitás
:
The inherent hardness of a coating. For thin coatings, ≈3-5µm, this is less easy to determine. Theoretical models exist, however, that enable the influence of the substrate to be taken into account. For example see O. Vingsbo, S. Hogmark, B. Jönsson, and A. Ingemarsson, in P.J. Blau and B.R. Lawn (eds): 'Microindentation Techniques in Materials Science and Engineering' 257-271; ASTM STP 889, 1986, Philadelphia, American Society for Testing and Materials. Yet another approach is to use the nanoindentation hardness technique.
flag Bevonat keménység
:
The interfacial shear strength along the coating substrate interface. Technically difficult to measure.
flag Bevonati határfelületi nyílószilárdság
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Holes or cavities in a coating, which may or may not be surface connected. Expressed as a volume or area fraction. It can be determined by image analysis of microsections or by density measurement methods (e.g., mercury infiltration).
flag Bevonat porozitás
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The distance between the external coating surface and the coat/substrate interface, usually expressed in µm (10-6m).
flag Bevonat vastagság
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The ratio of the tangential (friction) force (F) to the normal force (W) acting on two sliding or rolling surfaces, i.e., µ = F/W A dimensionless constant which should be inedependent of W (i.e., F is proportional to W; this is the first law of friction) providing both materials are stressed below their yield strength and that seizure does not take place. Because of the different contacting geometries µ can be significantly lower in rolling contact than in sliding contact. Also see Laws of Friction.
flag Surlódási együttható
:
Any surface treatment involving two or more sequential thermochemical diffusion steps, e.g., see multi-component boriding.
flag Összetett termokémiai kezelés
:
Any coating comprising (i) a mixture of finely dispersed metal and ceramic phases or (ii) a number of overlapping coatings of dissimilar materials that can be likened to an American sandwich. Also see duplex surface engineering.
flag Többrétegű bevonat vagy réteg
:
Also called white layer and (less commonly) nitrided layer. Refers to the outermost surface layer of nitrided or nitrocarburised steels comprising g'-Fe4N and/or e-Fe2-3N. Usually this zone should not exceed 10µm in thickness. Nitriding conditions are sometimes adjusted to completely avoid its formation (see bright nitriding). The wear resistant qualities of the e-Fe2-3N phase are exploited in nitrocarburising of plain carbon steels. See Nitrocarburising, Nitrotec and Nitrotec S. Contention still exists concerning the relative wear resistance of g'-Fe4N and e-Fe2-3N. Experience has shown that in examples where both phases coexist, detrimental residual stresses are built-up which contribute to exfoliation of the layer.
flag Összetett réteg
:
Variation in concentration of elements as a function of depth below the surface. Various techniques are used to derive such profiles, e.g., SIMS, GDOES and SES. Also see hardness profile.
flag Sűrűség eloszlás

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