Classifications

• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
  • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
  • C23C4/06—Metallic material
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C24/00—Coating starting from inorganic powder
  • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
  • C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
  • C23C26/02—Coating not provided for in groups C23C2/00 - C23C24/00 applying molten material to the substrate

Definitions

• the invention relates to a strand-shaped product for producing a corrosion and wear resistant layer on a substrate, wherein the strand has a flexible core, surrounded by a shell, soft binder, a fusible, metallic coating agent in powder form nickel-based, and not or only partially meltable Contains hard particles.
• the metallic core serves only as a carrier when applying the powdery coating composition in an extrusion process. It consists of a ductile metal with higher melting temperatures than the protective layer alloy.
• the particle sizes of the tungsten carbide particles are in the range between 0.04 and 5 mm. These particles do not melt or only slightly melt during the welding process and serve to increase the hardness of the protective layer.
• the primary task of the organic binder is to bind the metallic and carbide powder particles and make them processable by means of an extruder. The bond strength must be high enough to prevent blowing away during the welding process.
• the binder can contribute to the flexibility of the strand, so that it can be wound up on a spool.
• the protective layer alloy is a nickel-based alloy with additives of silicon, boron and chromium and with a melting temperature of around 1000 °.
• the invention is therefore based on the object to provide a strand-shaped product available that is easy and reproducible to process even protection layers on a substrate, with impairments of the substrate material are largely avoided.
• the coating composition comprises a first powder of a first nickel-based alloy having a lower melting temperature and a second powder of a second nickel-based alloy having a higher melting temperature, the difference between the melting temperatures of the first and second alloy in the range between 40 ° C and 120 ° C.
• the first and the second alloy powder are based on nickel.
• Such nickel base alloys are generally known for the production of corrosion and wear resistant layers. Due to the fact that the first and second alloy powders are based on nickel and, to that extent, have the same chemical composition, a substantially homogeneous structure of the protective layer is achieved and the formation of stresses is minimized.
• the alloy powders have a eutectic or non-eutectic composition.
• the melting temperature of a non-eutectic alloy composition having a melting range is understood to be the highest solidus temperature of the melting range.
• the first alloy has a melting temperature in the range between 850 ° C and 950 ° C, preferably in the range between 870 ° C and 930 ° C.
• the low melting alloy contributes to premature wetting and thus protection of the surface to be coated from further corrosive attack and reduces the amount of carbon that dissolves in the presence of carbonaceous hard material particles.
• the second alloy has a melting temperature in the range between 950 ° C and 1100 ° C, preferably in the range between 970 ° C and 1080 ° C.
• the difference between the melting temperatures of the first and second alloys is between 50 and 100 ° C.
• a particularly preferred embodiment of the invention is characterized in that the first alloy comprises a narrower melting range and the second alloy comprises a broader melting range.
• Non-eutectic alloys melt in a melting temperature interval caused by a first appearance of molten phase at the lowest liquidus temperature and complete melting at the highest solidus temperature is marked. It has been found that the alloying ingredient having the narrower melting range promotes soft melting of the coating agent, whereas the alloying ingredient having the broader melting range increases the toughness at the time of melting. By using these different melting components, the above effects of different melting temperatures are enhanced.
• the alloy with the narrower melting range may also be a eutectic alloy.
• the respective melting regions of the first and second alloys may be completely or partially overlapping, adjoining one another or separated from one another.
• the entire melting area of the coating agent extends over a particularly large temperature interval. This facilitates the processing of the coating agent and has an advantageous effect on the production of comparatively thick protective layers.
• the melting range of the first alloy comprises a melting temperature interval of at most 100 ° C., preferably at most 60 ° C.
• the comparatively narrow melting temperature interval of the first alloy further contributes to premature wetting and thus protection of the surface to be coated from further corrosive attack and reduces the amount of solubilizing carbon in the presence of hardstock particles of hardstock.
• a melting temperature interval in the range between 800 ° C and 950 ° C, preferably in the range between 820 ° C and 930 ° C, has proven particularly useful for the first alloy.
• the melting range of the second alloy comprises a melting temperature interval of at least 50 ° C., preferably at least 70 ° C.
• a comparatively wide melting temperature interval provides a further contribution to the toughness of this component in the coating agent and thereby causes some fixing or retention of the hard material particles so that they slowly and successively get into the soft surface layer, whereby a more homogeneous distribution of the hard material particles across the thickness of the protective layer is reached.
• a melting temperature interval has proven particularly useful, which is in the range between 900 ° C and 1100 ° C, preferably in the range between 930 ° C and 1070 ° C.
• the first alloy has a higher content of one or more of the alloy constituents molybdenum or copper than the second alloy.
• the difference in melting temperature is due to the addition or concentration difference of alloying constituents, which otherwise does not significantly affect the chemical nature of the alloy. Due to the higher content of melting temperature reducing ingredients such as molybdenum or copper, the melting temperature of the serious alloy powder is lower than the melting temperature of the second alloy powder.
• a preferred embodiment of the strand-shaped product according to the invention is characterized in that the weight ratio of the first alloy powder and the second alloy powder in the coating agent is in the range between 1/2 and 3/4.
• first and the second alloy powder have a particle size distribution which is characterized by a D 50 value of less than 130 ⁇ m
• the comparatively small particle size simplifies the application of the coating agent on the flexible core and promotes a soft melting of the alloy components and thereby contributes to a rapid wetting of the surface to be coated.
• the particle size is determined according to ISO 4497.
• the first and second alloy powders preferably consist essentially of spherical particles.
• a coating agent containing spherical particles is easier to handle, in particular easier to press onto the flexible core. Moreover, because of their smaller surface area, spherical particles are less susceptible to corrosion and therefore generally contain lower amounts of oxygen.
• the hard material particles comprise one or more of the oxides, nitrides, borides or carbides of tungsten, titanium, tantalum, molybdenum or chromium.
• the relatively expensive tungsten carbide is completely or partially replaced by hard material particles of one or more less expensive materials.
• the hard material particles comprise chromium carbide having a weight fraction in the range from 5 to 100% by weight (based on the total proportion of hard material particles).
• Chromium carbide is not only cheaper compared to tungsten carbide, but it is also characterized by a higher corrosion resistance. In addition, chromium carbide has a relatively lower hardness, so that components that come into frictional contact with the wear-resistant and corrosion-resistant protective layer, are less damaged.
• the flexible core of a solder strand consists of a flexible wire made of a nickel-based alloy with a melting temperature of 1250 ° C and it has an outer diameter of 1 mm.
• the wire is surrounded by a jacket with an outer diameter in the range between 3 and 10 mm; in the embodiment, it is 5 mm.
• the cladding contains two powders of different nickel-based alloys and hard-material particles surrounded by a binder mass, which are essentially cellulose compounds customary for this purpose. The two alloy powders and the hard material particles are evenly distributed within the shell.
• the weight proportions of the first alloy powder, the second alloy powder and the hard material particles in the order mentioned are as follows: 9:26:65.
• the powder of the lower melting, first nickel-based alloy is to be characterized as follows:
• the nickel-based alloy consists of (in% by weight) C: 0.20 Si: 2.85 B: 1.38 Fe: 0.15 Cr: 5.26 Not a word: 3.05 Cu: 5.15
• the nickel-based alloy consists of (in% by weight) C: 0.30 Si: 3.40 B: 1.60 Fe: 12:10 Cr: 8.70
• the two nickel-base alloys the hard material particles are homogeneously mixed together with a conventional binder composition and extruded the mixture by means of an extrusion process to the metallic wire and then wound onto a coil.
• the strand thus obtained is suitable for the production of corrosion and wear-resistant layers.
• the lower melting alloy flows out more easily and softer, thereby directly wetting and protecting the substrate surface.
• the hard material particles are, however, retained by the even more viscous portion of the coating agent and thereby reach later and gradually into the softened surface layer. As a result, a more homogeneous distribution of the hard material particles over the thickness of the protective layer is achieved.
• the melting area of the coating agent as a whole extends over a larger temperature interval, which facilitates the processing of the coating agent and has an advantageous effect on the production of comparatively thick protective layers.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Organic Chemistry (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Physics & Mathematics (AREA)
• Plasma & Fusion (AREA)
• Powder Metallurgy (AREA)
• Other Surface Treatments For Metallic Materials (AREA)
• Coating By Spraying Or Casting (AREA)
• Physical Vapour Deposition (AREA)
• Chemical Or Physical Treatment Of Fibers (AREA)
• Electric Connection Of Electric Components To Printed Circuits (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

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• 2005
  • 2005-11-15 DE DE102005054791A patent/DE102005054791A1/de not_active Withdrawn
• 2006
  • 2006-11-15 WO PCT/EP2006/068506 patent/WO2007057416A1/de not_active Ceased
  • 2006-11-15 US US12/085,050 patent/US20090120533A1/en not_active Abandoned
  • 2006-11-15 EP EP06829999A patent/EP1951925B1/de active Active
  • 2006-11-15 DE DE502006007932T patent/DE502006007932D1/de active Active
  • 2006-11-15 CA CA002634897A patent/CA2634897A1/en not_active Abandoned
  • 2006-11-15 PL PL06829999T patent/PL1951925T3/pl unknown
  • 2006-11-15 ES ES06829999T patent/ES2352973T3/es active Active
  • 2006-11-15 AT AT06829999T patent/ATE482298T1/de active
  • 2006-11-15 MX MX2008006351A patent/MX2008006351A/es active IP Right Grant

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