EP3052670A1 - Poudre de projection frittée à base de carbure de molybdène - Google Patents

Poudre de projection frittée à base de carbure de molybdène

Info

Publication number
EP3052670A1
EP3052670A1 EP14793791.6A EP14793791A EP3052670A1 EP 3052670 A1 EP3052670 A1 EP 3052670A1 EP 14793791 A EP14793791 A EP 14793791A EP 3052670 A1 EP3052670 A1 EP 3052670A1
Authority
EP
European Patent Office
Prior art keywords
spray powder
metallic matrix
total weight
weight
spray
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP14793791.6A
Other languages
German (de)
English (en)
Inventor
Benno Gries
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoganas Germany GmbH
Original Assignee
HC Starck GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HC Starck GmbH filed Critical HC Starck GmbH
Publication of EP3052670A1 publication Critical patent/EP3052670A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
    • B22F1/102—Metallic powder coated with organic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/026—Spray drying of solutions or suspensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/05—Mixtures of metal powder with non-metallic powder
    • C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/067—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds comprising a particular metallic binder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2301/00—Metallic composition of the powder or its coating
    • B22F2301/20—Refractory metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2302/00—Metal Compound, non-Metallic compound or non-metal composition of the powder or its coating
    • B22F2302/10—Carbide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2302/00—Metal Compound, non-Metallic compound or non-metal composition of the powder or its coating
    • B22F2302/25—Oxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • 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
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/129—Flame spraying
    • 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
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/134—Plasma spraying

Definitions

  • the present invention relates to a sintered spray powder obtainable using molybdenum carbides, a process for its production and the use of the spray powder for coating components, especially moving components. Furthermore, the invention describes a method for applying a coating using the spray powder according to the invention and a component coated therewith.
  • Spray powders are used to produce coatings on substrates by means of "thermal spraying.”
  • powdered particles are injected into a combustion or plasma flame which is directed onto a (mostly metallic) substrate which is to be coated the flame completely or partially, collide on the substrate, solidify there and form in the form of solidified "splats" the coating.
  • cold gas spraying on the other hand, the particles only melt on impact on the substrate to be coated as a result of the released kinetic energy.
  • cermet powders which are characterized by the fact that they contain hard materials (this is the ceramic component, "cer-"), most commonly carbides such as tungsten -, Chromium and more rarely other carbides, and on the other a metallic component as a metallic matrix (“-met”), which consists of metals such as cobalt, nickel and their alloys with chromium, more rarely also iron-containing alloys.
  • cer- ceramic component
  • -met metallic matrix
  • Such spray powders are also known to the person skilled in the art as "agglomerated / sintered” spray powders, ie in the production process first agglomerated (also referred to as pelletized), and then the agglomerate is thermally sintered in itself, so that the agglomerates are mechanically required for thermal spraying Get stability, but also such wettable powders, which are produced by sintering powder mixtures or compacts, followed by a comminuting step, meet the necessary requirements.
  • This type of spray powders are familiar to those skilled in the art as “sintered / crushed”.
  • the two aforementioned types of wettable powders are typified by the standard DI N EN 1274: 2005, for example. Both powder classes can also be described as "sintered spray powders”.
  • the geometric density of a coating is close to the true density, which is calculated from the volume-weighted proportions of the components (eg, the hard materials, the metallic matrix and any oxidation products) and their true densities.
  • the true density can be determined, for example, on completely dense coatings after they have been removed by means of the Archimedes method.
  • the true density of powdered coating materials can be determined as pure density, for example as skeletal density, by means of pycnometry, in particular by means of helium pycnometry (DIN 66137), with "completely" open-pore powders having the measured values very close to those of the true density.
  • the true density value of single-phase powders or bodies is identical to the X-ray density under ideal conditions.
  • the hard materials present in the coating must have a sufficiently good distribution in the metallic matrix and be of small size. It follows that thus also the metallic matrix should have a web width, which is of the same order of magnitude, which is also necessary for the polishing ability. A small web width of the metallic matrix leads to low elongation at break in cermet powders, which improves the polishing ability.
  • the mean distance between adjacent hard material particles in the coating is defined, which is filled with the metallic matrix.
  • the larger this web width the greater the maximum absolute elongation at break and the larger the deformed areas and thus the roughness of the polishing process.
  • Soft oxides are advantageous as surface species, the z. B. can be detected by surface analytical methods. These are advantageously soft layer lattice oxides such as B 2 0 3 , W0 3 or Mo0 3 and their hydrate acids. These have, inter alia, a strong, positive influence on the so-called breakaway torque after prolonged non-activity of the friction pair, as may occur especially in hydraulic piston rods or piston rings.
  • a coating used in the prior art is electroplated hard chrome.
  • a disadvantage is the highly polluting production of hexavalent chromium, which is classified as carcinogenic.
  • Advantageous is the very low coefficient of friction ( ⁇ ).
  • Ni- or Co-CrFeBSi-based melts are distinguished by extraordinarily dense, ie low-porous, layers. After melting of the initially porous sprayed layer, very hard but also very brittle CrB precipitates are present. Melting materials show a very low coefficient of friction, presumably because of the boron trioxide present on the surface, which is known to have good properties as a solid lubricant. Furthermore, the melts show very good polishing behavior, but are less resistant to wear (similar to hard chrome) because of the very low elongation at break.
  • a disadvantage is the very high true density of these coating materials and the resulting high geometric densities, typically up to about 14 g / cm 3 , which in comparison to hard chrome slightly higher coefficient of friction and the high raw material costs for tungsten.
  • the high geometric densities of rotating and flying components lead to increased energy consumption due to the increased moment of inertia or the larger flying weight.
  • Another alternative is Cr and chromium carbide-containing alloys, especially those based on iron and nickel, and cermet spray powder such as CrC-NiCr 75/25. This is common that during thermal spraying chromium oxide (Cr 2 0 3 ) is formed. This oxide is harder than metallic friction partners and dreads them, but has low coefficients of friction compared to metallic materials.
  • these oxide precipitates are predetermined breaking points of the ductile metallic matrix and reduce their elongation at break, so they are not a priori harmful.
  • it lacks the self-lubricating effect by soft oxides, which can be essential in the field of mixed friction.
  • the true density is comparatively low and is about 7.3 g / cm 3 .
  • the wear resistance of these coatings is comparatively low and not sufficient for many applications. It is therefore an object of the present invention to provide a coating which overcomes the disadvantages of the prior art.
  • it should be a composite material with a density of less than 10 g / cm 3 of true density, which has finely divided hard materials with an average of at most 10 ⁇ size with favorable friction in a gmaistegigen and finely divided metallic matrix, coupled with a low true density.
  • Molybdenum carbide based on the total weight of the hard material, wherein the average diameter of the molybdenum carbide in the sintered spray powder ⁇ 10 ⁇ , in particular ⁇ 5 m, is; and c) optional wear-modifying oxides.
  • the mean diameter of the molybdenum carbide was determined according to the ASTM B330 standard ("FSSS" Fisher Sub Sieve Sizer).
  • Suitable wear-modifying oxides in the context of the present invention are those which are sufficiently stable under the sintering conditions of the spray powder and are not reduced. These oxides are sufficiently hard due to their high thermodynamic stability and have the advantage of having low coefficients of friction compared to metallic systems.
  • the wear-modifying oxides are selected from the group consisting of Al 2 0 3 , Y 2 0 3 and oxides of the 4th subgroup of the Periodic Table. Farther The oxides are preferably provided as powders with mean particle sizes between 10 nm and 10 ⁇ m.
  • the spray powder according to the invention comprises wear-modifying oxides, the amount of wear-reducing oxides being between 0 and 10% by weight, preferably between 1 and 8% by weight, based on the total weight of the spray powder.
  • the percentages by weight add up to 100% by weight.
  • the spray powder according to the invention is sintered, particularly preferably agglomerated and sintered.
  • Such wettable powders are also referred to as agglomerated / sintered.
  • the powders according to the invention of the sintered / broken type are furthermore favorable, but in total the powders of the agglomerated / sintered type, as shown in DIN EN 1274: 2005, are preferred.
  • the basis of the hard material consists of fine-grained molybdenum carbides, preferably MoC and Mo 2 C.
  • base means that at least 70% by weight of the corresponding substance is present, based on the total weight of the hard material.
  • the remaining maximum of 30 wt .-% hard materials may be other carbides, preferably chromium and iron carbides because of their non-volatile and brittle oxides, or preferably tungsten carbide and boron carbide, the soft surface oxides have been found to be advantageous.
  • other carbides from the 4th to 6th subgroup of the periodic table can be used. The choice of suitable carbides will be made by the person skilled in the art on the basis of the surface state of the carbides and the intended application of the coating.
  • the spray powder contains 5 to 50 wt .-% metallic matrix, and thus 95 to 50 wt .-% of hard materials, of which molybdenum carbides constitute at least 70 wt .-%.
  • the spray powder thus contains 95 to 35 wt .-% molybdenum carbides, which are fine-grained ( ⁇ 10 .mu.m according to ASTM B330, measured on the powder used for spray powder production).
  • the percentages by weight (% by weight) of the powders and blends in the present invention add up to 100% by weight each.
  • Particle diameter or diameter in the context of the present invention designates the maximum extent of a particle, namely the dimension from an edge of the particle to the edge of the particle farthest from this.
  • boron is present in an amount of at most 1.4% by weight, preferably from 0.001 to 1.0% by weight, based on the total weight of the metallic matrix.
  • the percentages by weight (% by weight) of the powders and blends in the present invention add up to 100% by weight each.
  • the surface coating is preferably carried out by means of a thermal spraying method which is selected from the group consisting of flame spraying, plasma spraying, high-velocity air-fuel (HVAF) spraying and HVOF (high-velocity oxygen fuel) spraying.
  • a thermal spraying method which is selected from the group consisting of flame spraying, plasma spraying, high-velocity air-fuel (HVAF) spraying and HVOF (high-velocity oxygen fuel) spraying.
  • the spray powder according to the invention is distinguished by its comparatively low true density and is therefore particularly suitable for the coating of components which have a low weight, while at the same time extreme conditions such as high temperatures, large temperature fluctuations, weathers and / or exposed to particle erosion, but at the same time have to have a high wear resistance.
  • extreme conditions such as high temperatures, large temperature fluctuations, weathers and / or exposed to particle erosion, but at the same time have to have a high wear resistance.
  • the requirements, placed on moving parts, in particular rotating and flying parts are particularly high due to the additional mechanical stress.
  • a reduction in the flying weight requires a reduction in the fuel requirement or an increase in the so-called "payload", for example in the aviation industry.
  • the spray powder according to the invention is preferably used for coating components, especially for moving, in particular rotating components, preferably selected from the group consisting of fan blades, compressor blades, hydraulic piston rods, suspension parts and guide rails.
  • an embodiment of the present invention is preferred in which the spray powder according to the invention is used for coating aircraft components.
  • Another object of the present invention is a process for the preparation of the spray powder according to the invention.
  • the method comprises the following steps: a) providing a mixture comprising i) hard materials, comprising or consisting of molybdenum carbide, wherein the mean particle diameter of the molybdenum carbide ⁇ 10 ⁇ , in particular ⁇ 5 ⁇ , determined according to ASTM B330, and ii) a or more matrix metal powders wherein the matrix metal powder (s)
  • a sintered powder preferably a sintered powder of the agglomerated / sintered type.
  • Matrix metal powder in the sense of the present invention refers to metal powders which are suitable for the formation of the metallic matrix according to the invention.
  • the wear-modifying oxides are preferably selected from the group consisting of Al 2 0 3 , Y 2 0 3 and oxides of the 4th subgroup of the Periodic Table. Due to the fine particle size of the hard materials, the desired narrowstability of the matrix lamellae, which form between the particles, can be adjusted in a controlled manner. It has been shown that the smaller the particle size of the hard materials used, the greater is their specific surface area, which leads to a lower film thickness and thus to a lower web width of the wetting metal matrix.
  • a preferred embodiment is characterized in that an agglomeration step takes place between step a) and b) of the process according to the invention.
  • the agglomeration can be done, for example, by spray drying.
  • the organic binder can be, for example, paraffin wax, polyvinyl alcohol, cellulose derivatives, polyethyleneimine and similar long-chain organic auxiliaries, which are removed from the mixture in the course of the further process, for example during sintering, for example by evaporation or decomposition.
  • the inventive method for producing the wettable powders according to the invention comprises a method step in which the mixture is sintered.
  • the sintering of the mixture is preferably carried out at temperatures of 800 ° C to 1500 ° C, preferably from 900 ° C to 1300 ° C.
  • sintering is carried out after a preceding agglomeration step to produce agglomerated / sintered powders.
  • the sintered body obtained by sintering is subsequently crushed (broken up).
  • an object of the present invention is a coated component, which is obtainable according to the inventive method.
  • the method comprises applying a coating by thermal spraying of the spray powder according to the invention, as described in the present invention.
  • cobalt powder “efp” or “hmp” from Umicore (Belgium), nickel powder “T255” from Vale (Great Britain) or carbonyl iron powder “CM” from BASF (Germany) can be used.
  • the additives, which reduce the elongation at break as elongation at break or solidifying elements, consist of fine-grained metal or alloy powders, such as commercially available molybdenum powders, atomized alloys such as NiCr 80/20, or powdered ferroalloys such as ferrochrome, ferromanganese, nickel egg, ferrosilicon, ferroboron or nickel boron.
  • an agglomerated / sintered spray powder was obtained, which had the desired nominal particle size band of 45/15 ⁇ after further classification (see 3.3 in DIN EN 1274).
  • the resulting agglomerated / sintered spray powder had the following properties: Chemical composition (in percent by weight):
  • FIG. 2 shows a photomicrograph of a section of a pointed layer according to the invention. Clearly visible are the finely dispersed distribution of dark gray molybdenum carbide, a small ridge width of the light gray metallic matrix and an average particle size of molybdenum carbide, which is optically well below 10 pm.
  • the microstructure of the sprayed layer differs considerably in these points from the structures of other systems known from the prior art (cf., for example, EP 0 701 005 B1, FIG. 1 and [0011]).
  • Comparative Example Commercial, agglomerated / sintered WC- and chromium-carbide-based spray powders were processed into coatings under the same spraying conditions as described above and the wear results were measured according to ASTM G65. For the purpose of comparison, the mass loss was divided by the true density to directly compare the volume wear rates. An industrial electrolytic hard chrome coating was included. Further, the oxygen content of the layer after peeling was measured.
  • Example 1 to 3 and 5 are comparative examples and Example 4 is an example according to the invention. Except for hard chrome, all examples are cermets with a high degree of dispersion of the hard materials in the metallic matrix.
  • the two chromium-free agglomerated / sintered spray powders (Examples 2 and 4) produce self-cleaning sprayed coatings due to the absence of Cr and thus of non-volatile chromium oxide and have similar wear rates, but the sprayed layer of molybdenum carbide (Ex ) has the advantage of lower density. Although the chromium carbide sprayed layer has an even lower density, it has insufficient wear resistance.
  • the hardness of the spray coating according to the invention is more in a range comparable to chromium carbide based sprayed coatings (700-900) than tungsten carbide based coatings (1100-1300), the wear rate is more comparable to the latter, considering the hardness expected main influence on the wear is surprising.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Powder Metallurgy (AREA)

Abstract

La présente invention concerne une poudre de projection frittée à base d'une matrice métallique et de carbure de molybdène, son procédé de fabrication et l'utilisation de cette poudre de projection pour revêtir des composants, principalement des composants rotatifs et mobiles. L'invention concerne en outre un procédé pour appliquer un revêtement au moyen de la poudre de projection selon l'invention et un composant revêtu par ce procédé.
EP14793791.6A 2013-10-02 2014-10-01 Poudre de projection frittée à base de carbure de molybdène Withdrawn EP3052670A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013220040.4A DE102013220040A1 (de) 2013-10-02 2013-10-02 Gesinterte Spritzpulver auf Basis von Molybdänkarbid
PCT/EP2014/071080 WO2015049309A1 (fr) 2013-10-02 2014-10-01 Poudre de projection frittée à base de carbure de molybdène

Publications (1)

Publication Number Publication Date
EP3052670A1 true EP3052670A1 (fr) 2016-08-10

Family

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Application Number Title Priority Date Filing Date
EP14793791.6A Withdrawn EP3052670A1 (fr) 2013-10-02 2014-10-01 Poudre de projection frittée à base de carbure de molybdène

Country Status (10)

Country Link
US (1) US9919358B2 (fr)
EP (1) EP3052670A1 (fr)
JP (1) JP2016540883A (fr)
BR (1) BR112016006803A2 (fr)
CA (1) CA2925066A1 (fr)
DE (1) DE102013220040A1 (fr)
RU (1) RU2016117128A (fr)
TW (1) TW201536451A (fr)
WO (1) WO2015049309A1 (fr)
ZA (1) ZA201602071B (fr)

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WO2015081209A1 (fr) 2013-11-26 2015-06-04 Scoperta, Inc. Alliage à rechargement dur résistant à la corrosion
CA2951628C (fr) 2014-06-09 2024-03-19 Scoperta, Inc. Alliages de rechargement dur resistant aux fissures
EP3234209A4 (fr) 2014-12-16 2018-07-18 Scoperta, Inc. Alliages ferreux tenaces et résistants à l'usure contenant de multiples phases dures
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CA2925066A1 (fr) 2015-04-09
US9919358B2 (en) 2018-03-20
TW201536451A (zh) 2015-10-01
WO2015049309A1 (fr) 2015-04-09
BR112016006803A2 (pt) 2017-08-01
US20160243616A1 (en) 2016-08-25
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DE102013220040A1 (de) 2015-04-02
ZA201602071B (en) 2017-03-29

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