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surface Engineering

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الكلية كلية الهندسة/المسيب     القسم هندسة السيارات     المرحلة 3
أستاذ المادة جعفر هادي عبود المياح       31/10/2018 12:17:48
Surface engineering
Surface engineering refers to a wide range of technologies that aim to design and modify the surface properties of components. There are two main categories of surface engineering methods that can be used to optimize the surface properties and the bulk materials. These are surface coatings and surface modification.
Surface coating processes involve depositing a layer of molten, semi-molten or chemical material onto a substrate. One of the main functions of surface coating is to modify and reinforce the surface functions instead of reforming the composition of the bulk material. Some examples of surface coating processes include (1) Physical Vapour Deposition (PVD), (2) Chemical Vapour Deposition (CVD), (3) plasma and thermal spraying, (4) cladding and (5)electroplating.
Surface modification processes which can be classified as hardening by flame, induction, laser or electron beam, high energy treatments, e.g. ion implantation; and diffusion treatments, e.g. carburizing and nitriding. Surface modification processes are applicable to control friction, improve surface wear and corrosion resistance, and change the physical or mechanical properties of the component. Surface modification treatments also can be combined with surface coating processes, for instance laser cladding. This combination enhances the advantages of surface coatings and surface modification, thus achieving specific requirements and fitness for purpose. Surface Coating: any mixture of film-forming materials plus pigments, solvents, and other additives, which, when applied to a surface and cured or dried, yields a thin film that is functional and often decorative. Surface coatings include paints, drying oils and varnishes, synthetic clear coatings, and other products whose primary function is to protect the surface of an object from the environment. These products can also enhance the aesthetic appeal of an object by accentuating its surface features or even by concealing them from view. Most surface coatings employed in industry and by consumers are based on synthetic polymers—that is, industrially produced substances composed of extremely large, often interconnected molecules that form tough, flexible, adhesive films when applied to surfaces. High precision Coating Powder Coating The other component materials of surface coatings are pigments, which provide colour, opacity, gloss, and other properties; solvents or carrier liquids, which provide a liquid medium for applying the film-forming ingredients; and additives, which provide a number of special properties. This article reviews the composition and film-forming properties of polymer-based surface coatings, beginning with the polymer ingredients and continuing through the pigments, liquids, and additives. The emphasis is on paints (by far the most common type of coating), though occasional reference is made to other types of coatings such as drying oils and varnishes. For a fuller understanding of polymeric compounds, which form the basis of surface coatings, the reader is advised to begin with the article industrial polymers, chemistry of. For an overview of the position of surface coatings within the broader field of industrial polymers, see Industrial Polymers: Outline of Coverage.
A coating is a covering that is applied to the surface of an object, usually referred to as the substrate. The purpose of applying the coating may be decorative, functional, or both. The coating itself may be an all-over coating, completely covering the substrate, or it may only cover parts of the substrate. An example of all of these types of coating is a product label on many drinks bottles- one side has an all-over functional coating (the adhesive) and the other side has one or more decorative coatings in an

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