Method for producing metallic coatings

 

The invention relates to metallurgy, in particular to a method for producing a metallic coating, and can find application in various engineering industries. Put a metal coating on a metal base. Heated surface layer and coated with a concentrated flow of energy. Produce short-time heating of the surface layer and the coating, which is chosen from the condition melting of metallic materials near the border of the coverage is the basis of preserving the surface of the coating layer in the solid state. When this is achieved the high bonding strength of the coating with the product and kept the surface roughness. 2 Il.

The invention relates to mechanical engineering and metallurgy, mainly to the technology of producing metal coatings on metals and alloys.

The known method of laser sintering, in which the surface of the powder in the area of direct sintering sintering laser beam [1]. Similar significant indication of the equivalent of the claimed invention is to heat the surface layer of concentrated energy flux (laser radiation). When applying this method impossible is - Lituanie.

The closest to the essential features is the way of laser welding, in which the treated surface is pre-applied surfaced material and upravlyaut him with a laser beam [2], Similar to the essential features of the prototype and the claimed invention are applied to the surface of the coating and heating the surface layer of concentrated energy flux (laser radiation). The implementation of the method described in the prototype, leads to the complete melting of the surface layer, the mixing of materials deposited substances to the substrate and increase surface roughness, which leads to the necessity, in most cases, conducting machining - grinding the surface of the product.

To ensure the technical result consists in the connection of the metallic coating to a metallic article, ensuring the bonding strength of the coating product that is comparable to the strength of the coating material or materials of the product, and preservation of surface roughness or her minor changes, it is proposed the following method. The method is applied on a metal product maim, detonation obtained by vapour deposition of metal in a vacuum and so on (see, for example [3] ). Next is a short - pulse heating of the coating and the surface layer of the metallic product. The heating mode is selected as the metal melting near the border of the floor - based. The energy flux density is determined by the temperature difference between the melting point of the coating and the substrate. The duration of exposure energy flux to the surface is determined by the generation time of a given quantity of the liquid phase on the border of the floor-based. For implementing the method as KPIs can be used with the laser, the beams of accelerated electrons, ion beams, electric arc, plasma jet, HDTV. The main requirements to the sources of concentrated energy fluxes are local impacts, and the possibility of regulating the duration and power to provide modes of heating. The difference between the claimed technical solution is the choice of the mode of heating the surface of a metal product with a coating providing technical result.

List of figures. In Fig.1 shows the temperature distribution along the depth from the surface of the coating at obvisiously surface temperature chrome plating (and depending on the temperature boundary chrome-steel 20 at a depth of 20 μm from the surface (from time. The reference time corresponds to the beginning of exposure to laser radiation.

To confirm the possibility of carrying out the invention according to the proposed method let us consider a specific example. Steel 20 is applied electrolytic chromium coating thickness of 20 μm. Next floor briefly heated by laser radiation. Temperature heating mode shown in Fig. 1, figs.2. Thus, the laser power is 400 W, the beam diameter of 0.9 mm, the duration of heating is 21 MS. Since the melting point of chromium is 1830oAnd steel 20 - 1480oWith, if the heating mode is formed of a liquid sublayer in the border region chromium-steel 20 while maintaining the surface layer of chromium in the solid state. After cooling due to the heat inside the product and partially through the heat sink from the surface to place the liquid sublayer, a solid solution iron-chromium-carbon. The concentration of chromium varies smoothly from 100% at the surface to 0% at the lower limit of the melt. Thus is achieved the main goals of the invention: the roughness of powerise from the melt transition layer has high strength characteristics, the appropriate strength of the alloy of iron-chromium, which exceeds the corresponding characteristics of the steel 20.

Literature 1. EN 2132761 C1 (UNITED TECHNOLOGIES CORP.), 10.07.1999.

2. SU 1609003 A1, (Aravin bpts and other), 20.05.1996.

3. Pole, M. S. Technology of hardening. Technological methods of hardening. 2 so 1 So. - M.: "L. C. M. - SCRIPT", "ENGINEERING", 1995. - 832 S.

Claims

A method of obtaining a metal coating comprising a metal coating on the metal base and the heat of the surface layer and the coating concentrated energy flow, characterized in that produce short-time heating of the surface layer and the coating, which is chosen from the condition melting of metallic materials near the border of the coverage is the basis of preserving the surface of the coating layer in the solid state.

 

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FIELD: food and light industry.

SUBSTANCE: invention relates to processing of articles and forming of picture inside transparent or semitransparent materials. System includes optical unit to form laser punctures in article material combination of which composes number of symbols of marking picture, unit to feed article to zone of marking and process control unit. Optical unit contains pulse laser set with at least one optical channel connected with unit of article scanning and/or positioning relative to focusing lens of laser set. Process control unit is furnished with device for time synchronization of beginning of marking with position of zone of article marking. Laser pulse frequency index, capacity of conveyor and number of channels are related by mathematical dependence. Invention makes it possible to form pictures by marks inside thin-walled articles with curvilinear surface under conditions of high-speed conveyor production.

EFFECT: improved reliability of marking non-reproducible under other conditions.

5 cl, 1 ex, 1 dwg

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