EP3112531B1 - Composant pour une machine destinee a fabriquer et/ou a traiter une bande de matiere fibreuse et utilisation d'une poudre à pulvériser pour produire une couche fonctionelle pour un composant pour une machine destinee a fabriquer et/ou a traiter une bande de matiere fibreuse - Google Patents

Composant pour une machine destinee a fabriquer et/ou a traiter une bande de matiere fibreuse et utilisation d'une poudre à pulvériser pour produire une couche fonctionelle pour un composant pour une machine destinee a fabriquer et/ou a traiter une bande de matiere fibreuse Download PDF

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Publication number
EP3112531B1
EP3112531B1 EP16177481.5A EP16177481A EP3112531B1 EP 3112531 B1 EP3112531 B1 EP 3112531B1 EP 16177481 A EP16177481 A EP 16177481A EP 3112531 B1 EP3112531 B1 EP 3112531B1
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Prior art keywords
phase particles
hard phase
hard
functional layer
grain size
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EP16177481.5A
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German (de)
English (en)
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EP3112531A1 (fr
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Sebastian Sperling
Alexander Etschmaier
Franz Grohmann
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Voith Patent GmbH
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Voith Patent GmbH
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/08—Pressure rolls
    • 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
    • C23C4/067—Metallic material containing free particles of non-metal elements, e.g. carbon, silicon, boron, phosphorus or arsenic
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • D21G1/0246—Hard rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • D21G3/005—Doctor knifes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls

Definitions

  • the invention relates to a component for a machine for producing and / or treating a fibrous web, in detail according to the independent claim 1. Furthermore, the invention also relates to the use of a spray powder for producing such a coating, in detail according to the remaining independent claim.
  • EP 0710741 A2 describes a heatable calender roll as a component of a paper machine.
  • the calender roll has a metallic functional layer with a binder phase and a hard phase and a corresponding spray powder for producing such a coating.
  • DE 102013201740 A1 assumes a scraper blade as a component of a paper machine, which has a multi-layer coating of hard metals / cermets.
  • the outermost layer 3.3 is considered a metallic functional layer. It also has a binder phase and a hard phase and can be produced by thermal spraying implicitly from a corresponding spray powder.
  • US 2007/202350 A1 shows a metallic functional layer for use in tools of machining, here deep hole drills.
  • the finished metallic functional layer which can be implicitly applied from a powder by thermal spraying, comprises a hard and binder phase and also has the features of the characterizing part of independent claims 1 and 10.
  • US 2006/213326 A1 speaks of thermally sprayed coatings or sintered moldings for the gas turbine application as well as the semiconductor technology.
  • the coatings or molded parts are produced from agglomerates a hard material - here a sublimable ceramic - and a metal or semiconductor as a binder.
  • the wettable powder comprising such agglomerates can be processed by thermal spraying. It can comprise a multi-modal particle size distribution of the hard materials.
  • rolls are used, for example in the form of calender rolls in calenders for the final processing of the surfaces of paper webs.
  • the roughness of Kalanderwalzenober lake has a significant impact on the surface properties of the paper produced, such. B. its gloss and smoothness.
  • calender rolls Due to the high contact pressure and the high temperatures at which calender rolls are operated, their surface is exposed to high mechanical and thermal loads. Therefore, calender rolls are usually provided with a roll cover that combines sufficient ductility with a high surface hardness.
  • a roll cover that combines sufficient ductility with a high surface hardness.
  • the radially outer or outermost surface comes in operation with the paper web at least indirectly in contact.
  • Such known functional layers generally have a binder phase which performs the task of a matrix.
  • a matrix may comprise or be made of, for example, nickel, cobalt or iron serving as a binder for a hard phase embedded therein.
  • the hard phase can be in the form of hard particles such as hard material grains.
  • the material for the hard phase usually metal-type carbides such as tungsten carbide, titanium carbide or chromium carbide, metallic nitrides such as titanium nitride and mixtures thereof and carbonitrides such as titanium carbonitride used. While the metal used for the binder phase is selected in terms of the ductility of the roll cover to be achieved, the hardness of the reference surface is determined by the carbide grains embedded therein.
  • doctor blades are applied to the roll surface, which remove the impurities from the roll surface.
  • Such doctor blades can, where they come into contact with the roller or its roller cover, also be equipped with corresponding functional layers.
  • US2013 / 0251910 A1 discloses thermally sprayed roll covers for the production of paper.
  • the finished coating comprises nano- and microcrystalline particles of different but discretely selected diameters. These discrete particles of hard material are both embedded in an amorphous phase.
  • the nanocrystalline particles may have a particle size of less than 100 nm, whereas the microcrystalline particles may have a size of 100 to 1000 nm.
  • This publication does not disclose a multimodal frequency distribution of the hard material particles, but only two discrete particle sizes of the hard material particles. Because the publication reveals no maxima of the particles, which would then represent the modes of the frequency distribution.
  • the amorphous-nano-microcrystalline structure does not reside in the spray powder, it is achieved only by the thermal spraying process, ie during the cooling of the at least partially liquefied spray powder on the substrate to be coated. It depends on the degree of melting, whether the spray powder is a nanocrystalline or microcrystalline particles. In other words, the publication discloses that neither the spray powder nor the coating shows a multimodal frequency distribution of the hard material particles arranged therein.
  • a considerable disadvantage of the amorphous material functioning as matrix is its comparatively high brittleness.
  • the very rapid cooling of the spray powder results in the amorphous phase, which corresponds to a metallic glass. Such metallic glasses are very brittle due to their amorphous structure.
  • binder phase For applications in the production or treatment of fibrous webs high brittleness of the matrix, but also called binder phase is undesirable. Because it is the main task of such a hard metal or cermet, that the binder phase is just ductile, for example, to avoid the breaking out of the hard particles. If the binder phase is therefore carried out quite brittle, as is the case in the publication, it may lead to undesirable spalling of the coating in beticianeze H operation of the coating or the component.
  • the present invention relates to such coated rolls and doctor blades, but is not limited exclusively to these, but can also other comparable claimed components of a machine for manufacturing and / or Treatment of a fibrous web such as paper web are applied.
  • An example of rolls are central press rolls in the press section of a paper machine.
  • doctor blades it is possible to use knives or scrapers which come into contact, at least indirectly, in the machine with the roller, the fibrous web or a coating to be applied thereto. At least indirectly means here at least an indirect contact of the relevant parts or even a direct, so immediate contact is conceivable.
  • doctor blades may be doctor blades for applying a coating to the fibrous web, creping blades for creping a fibrous web from a roll, or cleaning scrapers for doctoring a roller to clean it.
  • the object of the present invention is therefore to provide a component of a machine for producing and / or treating a fibrous web, such as a calender roll or a doctor blade, by means of which the disadvantages due to washing out of the binder phase can be prevented. It is also the object of the invention to provide a use of a corresponding spray powder for producing such a coating.
  • a fibrous web is to be understood as a scrim of fibers, such as wood fibers, synthetic fibers, glass fibers, carbon fibers, additives, additives or the like.
  • the fibrous web may be formed, for example, as a paper, board or tissue web, which essentially comprise wood fibers, wherein small amounts of other fibers or additives and additives may be present.
  • a component for a machine for producing and / or treating a fibrous web is understood, for example, to mean a roll or a doctor blade.
  • the component can be a basic body, in Trap of a roller, a preferably cylindrical roller core, in the case of a doctor blade, in particular a strip-shaped body having.
  • the roll may be a calender roll or a drying cylinder, such as Yankee cylinders. It can be designed heated or heated.
  • the term functional layer in the sense of the present invention is meant a layer which comes into direct or indirect contact with another part of the machine. This part can rest or move relative to the component having the functional layer.
  • direct or indirect it is meant that the functional layer is applied indirectly (indirectly to at least one intermediate layer arranged between main body and functional layer) or directly (directly, ie without an intermediate layer) to the main body.
  • the at least one intermediate layer may be an adhesive layer, which serves for the bonding between on the one hand the main body and the at least one functional layer.
  • functional layer means that radially outer or outermost layer which, for example, comes into contact with the paper web and / or a doctor blade during operation of the machine.
  • a roll cover or a doctor blade coating in the sense of the present invention therefore comprises at least one functional layer, but may also additionally have the at least one intermediate layer.
  • the functional and / or intermediate layer can / can be constructed from a plurality of individual layers.
  • the functional layer can be at least partially metallic, that is to say partly comprise a metal or be made entirely from one.
  • binder phase is meant a toughening component such as a matrix or a binder.
  • hard phase is meant an enhancement of the binder phase in which the hard phase is embedded.
  • Hard phase and binder phase of the finished coating can together form a hard metal. They thus form a (exactly) two-phase material. Both phases are distributed homogeneously over the total thickness of the functional layer, ie mixed together.
  • cermet a composite comprising a hard phase and binder phase.
  • the hard phase in this case has hard-phase particles, which may be selected from: carbides, nitrides or borides of the 4th, 5th or 6th main group of the periodic table and mixtures thereof.
  • An example of this is tungsten carbide (WC).
  • ceramics or oxide ceramics, such as aluminum oxide (Al 2 O 3 ) or zirconium dioxide (ZrO 2 ) are conceivable.
  • the binder phase comprises binder phase particles which may include: a metal, a metallic alloy - such as cobalt (Co) or nickel-chromium (NiCr), and mixtures thereof.
  • finished coating means a ready-to-use coating as it can be used for the purpose mentioned, ie in particular a solidified at room temperature material compared to the starting material such as the mixture of the spray powder according to the invention over the unprocessed starting particles high hardness, wear resistance and especially the has high hot hardness.
  • the reference surface thus the functional layer e.g.
  • the roller can be ground to the roughness required for the particular application.
  • average grain size is meant the mean size of individual particles (also called grains) in a mixture or in a functional layer of the finished coating.
  • the particles are usually irregular shaped.
  • the equivalent diameter of the particles is often used. This is calculated from the comparison of a property (eg diameter or volume) of the irregular particle with a corresponding property of a regularly shaped particle (eg in the form of a sphere or an ellipsoid of revolution).
  • grain size distribution is understood to mean the particle size distribution, that is to say the general statistical frequency distribution of the particle sizes.
  • the result of a particle size analysis is the particle size distribution, ie a frequency distribution in the form of a bar or line graph.
  • the percentage (weight percent) of the graded grains is plotted on the ordinate of a coordinate system.
  • the usual statistical parameters such as mean, median, percentile values, distribution or skewness of the distribution, as well as the non-uniformity number, can be calculated to characterize the sample in terms of grain size.
  • the resulting frequency distribution in the form of a bar or line graph has exactly one maximum, e.g. in the form of a Gaussian bell, it is a monomodal particle size distribution. If, on the other hand, it has exactly two maxima, then it is a bimodal particle size distribution. Accordingly, therefore, the particle size distribution of the hard material particles or hard phase particles has a bimodal distribution, so that most of the first hard phase particles have such a grain size that they scatter around the first maximum, whereas the second hard phase particles have such a grain size that they scatter around the second maximum , In other words, the average grain sizes of the two hard phase particles (and thus the two modes) are different.
  • the hard phase has at least first and second hard phase particles which differ in terms of their average grain size.
  • at least first and second hard phase particles is meant that exactly two or more than two hard phase particles can be provided. If exactly two (first and second) hard-phase particles are provided according to an alternative of the invention, then a bimodal particle size distribution of hard-phase particles results. In other words, the average grain size of the first hard-phase particles is larger than the average grain size of the second Hard phase particles, resulting in a bimodal particle size distribution of the hard phase particles in the binder phase.
  • third hard-phase particles are also provided, so that a trimodal grain-size distribution of the hard-phase particles results analogously.
  • higher modes than three would be conceivable in principle, each mode would have corresponding hard phase particles having a corresponding average grain size.
  • the term "at least bimodal" means that a plurality of modes, ie a multimodal frequency distribution of the corresponding hard-phase particles is conceivable.
  • the average particle sizes of the hard-phase particles of the different modes can differ from one another here.
  • Even better than the bimodal is the trimodal frequency distribution of the hard-phase particles.
  • the bimodal frequency distribution within the binder phase between the larger, first hard-phase particles smaller second hard-phase particles settle in the gaps between adjacent, comparatively large first hard-phase particles.
  • the effective attack surface of the binder phase is reduced. This results in fewer microcracks and furrows on the surface of the functional layer.
  • the gloss of the functional layer during abrasion therefore remains over a longer time. If even smaller, third hard-phase particles are used in the trimodal frequency distribution, then these in turn fill in the gaps between adjacent second hard-phase particles and "close" these gaps even better.
  • both the hard and the binder phase of the finished coating is at room temperature or in the intended use of the coating / Component in crystal form before.
  • the binder as well as the hard phase form a Nahsowie long distance order within the functional layer.
  • the mean, ie average distance between the hard material grains or hard phase particles in the binder phase is referred to as gap dimension in the sense of the invention.
  • spray powder is basically understood to be the starting material from which the finished functional layer is to be produced.
  • the spray powder according to the invention is a powder for thermal coating.
  • a spray powder is a solid material at room temperature and in particular a granular or lumpy mixture, which is present in a pourable form. Due to the bimodal particle size distribution, the spray powder has exactly two particle size fractions.
  • thermal coating in the context of the present invention provides that for the production of the corresponding functional layer a material as spray additive, for example as powder, wire or otherwise suitable form by entry of thermal energy or completely melted and on the base body to be coated is accelerated kinetically.
  • the impinging material cools, solidifies and forms a mechanical, such as positive connection, with the body.
  • powder means the spray additive material, ie that starting material which inside or outside of a spray burner ab-, on or melted and accelerated, for example in a gas stream in the form of spray particles to to fling the surface of the underlying substrate (eg base or intermediate layer). Powder is therefore that starting material which is applied to the substrate to be coated for the purpose of producing the corresponding functional layer.
  • the present invention also relates to an aforementioned machine in which the component according to the invention, in particular as roller or doctor blade is installed.
  • the layer thickness of the coating or functional layer may be 50 to 750 ⁇ m.
  • the hardness of the coating or functional layer may be more than 500 HV. If in the context of the invention of HV (hardness Vickers) is mentioned, it is meant that the standard DIN EN ISO 6507, was applied to determine this hardness value and the following test conditions of the measurement were based: Gleich roome diamond pyramid with an opening angle of 136 ° Indenter, specified test force of 2.942 N (hardness symbol 0.3), with which the indenter is pressed into the workpiece, test temperature between 10 ° C and 35 ° C, preferably 23 ° C (+/- 5 ° C).
  • the coating or functional layer may finally be ground after its production.
  • the roughness can then have an Ra value of 0.2 or less, preferably 0.1, particularly preferably 0.08.
  • the percentages of hard and binder phase particles according to the invention should be selected within the specified limits so that they-apart from impurities-at least theoretically add up to 100% and always hard and binder phase particles occur together.
  • the present invention also relates to a use of a spray powder according to the invention in the production of a functional layer for a component of a machine for producing and / or treating a fibrous web.
  • the invention also relates to the coating of the component according to the invention itself, which, however, is not covered by the claims.
  • the component according to the invention and / or the coating according to the invention can be produced by thermal spraying from the spray powder according to the invention, which itself has at least one bimodal frequency distribution of the at least first and second hard material particles which are mixed together with binder particles.
  • the at least bimodal frequency distribution of the particle sizes of the hard-phase particles (almost unchanged) of the sprayed powder is also found in the finished coating or the component.
  • Fig. 1 shows schematically two produced according to the invention, rolling elements in the form of rolls 1 for the production and / or further processing of a fibrous web, such as a paper, board or tissue web, as indicated between these two.
  • Rollers 1 can be part of the machine mentioned at the outset (paper, board or tissue machine) and designed, for example, as calender rolls. In principle, in such a machine, it is not always necessary to roll both rollers 1 shown one on top of the other.
  • the rollers 1 can also be used in various positions in which they come into contact directly or indirectly with a fibrous web 10. In the position of a central press roll in the press section of a paper machine technically highest demands are placed on the roll 1 and its coating.
  • the rollers 1 comprise a base body 2 (see Fig. 3a ) and are provided according to the invention with a coating 5, which may consist of at least one functional layer 4, as will be explained below.
  • the Fig. 2 shows very schematically the order of a coating according to the invention.
  • the roll 1 to be coated is used to produce the coating 5 comprising the at least one functional layer 4 (see FIG Fig. 3a ) is applied by means of a thermal coating device 6 for thermal coating.
  • Roller 1 is rotatably mounted about its longitudinal axis and is suitably driven, so that it rotates away under a preferably parallel to the longitudinal axis along the roller 1 relative to this back and forth displaceable applicator 7.
  • the entire surface of the roller 1 can be coated successively, for example in a continuous spiral line.
  • the thermal coating device 6 for producing the roll according to the invention comprises an applicator 7, a material supply 8 which can optionally be switched on and off, an energy source 9, in which a powder, such as spray powder, in the form of a mixture is usually introduced and not Shielding gas supply shown for supplying protective gas to the roller 1.
  • the coating device 6 may be designed such that it can perform both the thermal spraying and Lasercladding.
  • the term laser cladding or a method immediately following this means a coating method by means of which it is possible to have the surface to be coated - ie the substrate, like the base body 2 Fig. 3a, 3b - even melt on or completely.
  • a high heat input is not possible in the known thermal spray processes, such as flame, high-speed flame, arc or plasma spraying, which leads to the on or melting of the substrate.
  • a melting or melting in Lasercladding can be done for example by supplying thermal energy to the substrate to be coated and can be preferably realized by radiation, such as laser radiation.
  • the material of the adhesive or functional layer is generally introduced into laser beam path in the beam path of the laser, melted and applied to the substrate.
  • the laser beam melts the surface of the substrate with respect to the radial thickness at least partially on or completely over its thickness in the radial direction, as far as such a complete melting makes sense.
  • inert gas is presently indicated by the cone, which adjoins the power source 9.
  • the protective gas can serve to entrain and / or accelerate the material, such as spray additive material, which is introduced into the beam path of the energy source 9 for melting.
  • spray additive material such as spray additive material
  • off, on or molten spray powder to be coated roller 1 here for example the bare (ie initially uncoated) base body 2 in the form of a cylindrical roller core (see FIG. 3a ) of the roller 1.
  • the surface of the underlying substrate is also melted, as is the case with laser cladding, then the melted material of the spray powder supplied to the substrate also enters the substrate melt. Otherwise only finds a clinging of the impinging at least partially melted spray powder on the surface to be coated of the roller 1 instead, as is the case in principle in conventional thermal spraying.
  • energy source 9 are therefore basically inductive and plasma-generating devices, devices that emit electron beams or lasers of various types such as CO 2 laser, HDPL (High Power Diode Laser) or DDL (Direct Diode Laser) or combinations possible.
  • the thermal coating device 6 can be embodied such that both a thermal spraying with and without at least partial melting of the underlying substrate is possible. This can be achieved, for example, by means of the energy source 9, the thermal energy is adjusted accordingly.
  • FIGS. 3a and 3b each show a highly schematic view of a partially sectioned view of a component according to the invention with a coating 5 along the respective longitudinal axis.
  • the representation is therefore not to scale, in particular as regards the thickness of the functional layer with respect to the base body 2.
  • FIG. 3a is a roller 1, as in the Figures 1 and 2 is shown to see. It can be seen that this has a main body 2 in the form of a roll core.
  • the roll core may be a cylinder or hollow cylinder made of steel or other suitable material.
  • a coating 5 with a single functional layer 4 is applied to the base body 2. It forms the radially outermost surface of the roller 1, which in normal use in the machine at least indirectly (eg indirectly via a felt or directly) comes into contact with the fibrous web.
  • FIG. 3b shows an example of a doctor blade.
  • the latter comprises a base body 2.
  • an edge 11 is formed approximately in the manner of a chamfer.
  • Edge 11 is followed on the one hand by the width edge 3 and, on the other hand, by a surface 12.
  • Edge 11 and surface 12 form the top of the doctor blade. This can form those, when used properly, the roller or the fibrous web side facing.
  • the surface 12 of the opposite surface of the base body 2 of the doctor blade is referred to as the back 13 (not shown).
  • Fig. 4 is in a highly schematic sectional view of a partial cross section perpendicular to the longitudinal axis through the finished coating 5 of the roller 1 from FIG. 3a or perpendicular to the longitudinal axis of in FIG. 3b shown scraper blade shown. To simplify the illustration, the roll curvature has been disregarded. It should also be noted that the thickness of the coating 5 or of the individual functional layer 4 and of the particles shown therein is not shown to scale.
  • the functional layer 4 is applied directly to the main body 2 - in the case of the roll on the roll core.
  • the latter includes a binder phase 4.1 (shaded) and a hard phase 4.2.
  • the binder phase 4.1 In the binder phase 4.1, the hard phase 4.2 is embedded, so that the binder phase 4.1 surrounds the hard phase 4.2.
  • the binder phase 4.1 thus serves as a matrix for the hard phase 4.2, which comprises or consists of the first hard-phase particles 4.2.1 and second hard-phase particles 4.2.2.
  • the first hard-phase particles are 4.2.1 in the Mean significantly larger than the second hard phase particles 4.2.2.
  • the latter are each arranged in the intermediate spaces between the first hard-phase particles 4.2.1 in the binder phase 4.2.
  • Both first and second hard-phase particles 4.2.1, 4.2.2 are in this case made of the same material. However, they could also be made of different materials, such as different MAX phases.
  • Fig. 5 is, regardless of the embodiments shown so far, a multimodal grain size distribution of the hard phase particles according to the invention shown.
  • the course shown here is purely exemplary.
  • the percentage (here in weight percent) of the classified hard phase particles is plotted on the ordinate of the Cartesian coordinate system.
  • a bimodal in the extension of the bimodal curve in dashed line a trimodal grain size distribution of the hard phase particles is shown.
  • the values d 1.10 and d 1.90 refer to the first mode and the values d 2.10 and d 2.90 to the second mode.
  • the former describe the main grain size interval of the first mode, the second the main grain size interval of the second mode.
  • the local maximum of the curve for this interval lies in these grain size intervals.
  • the values d 1.10 and d 1.90 as well as d 2.10 and d 2.90 each describe the width of the corresponding interval in the direction of the abscissa.
  • d 1.10 and d 2.10 respectively describe the beginning of the interval at which the average grain size has 10% of the full grain size width (in the abscissa direction) of the corresponding mode.
  • the values d 2.10 and d 2.90 describe the end of the interval, that is, where the total width of the mode in the direction of the abscissa corresponds to 90% of the width of the interval of the second mode.
  • d is 1.90 larger, ie, d 1.10 and d 2.90 is greater than d 2.10 .
  • the curve is chosen here such that both intervals are spaced apart (d 1.90 and d 2.10 do not coincide here). It would be conceivable, however, that the course of the curve is chosen such that d 1.90 and d 2.10 coincide or are chosen so that both modes overlap in terms of their intervals.
  • the explanations given here apply equally to a tri-and multimodal distribution or curve.
  • the particle size distribution as exemplified in Fig. 5 can be shown here by means of laser diffraction methods, eg Cilas 1090 (Fraunhofer Scattering Theories). be measured.
  • the particles of the spray powder are placed in a liquid, so that a suspension is formed, which flows through a cuvette and is irradiated with a laser. Due to the resulting scattering patterns of the laser grain size distribution is then generated as a graph.
  • a functional layer of high stability is achieved by means of the invention.
  • the effect of leaching the binder phase 4.2 is significantly reduced by the abrasion resistance of the component is increased. This is done by reducing the mean free path, ie the gap between the first hard phase particles 4.2.1, within the binder phase 4.2 compared to a monomodal particle size distribution (without second hard phase particles 4.2.2). Because the smaller, e.g. second hard-phase particles 4.2.2 settled in the binder phase 4.2 in the gaps between the larger, first hard-phase particles 4.2.1. By filling these gaps with the smaller, second hard-phase particles 4.2.2, the effective attack surface of the binder phase 4.2 is also reduced. This results in fewer microcracks and furrows on the surface of the functional layer. The gloss therefore remains over a longer time.
  • the service life of the thus coated component can be significantly increased. This in turn leads to higher maintenance intervals and a reduced downtime of the machine.

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  • Physics & Mathematics (AREA)
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  • Paper (AREA)

Claims (15)

  1. Composant destiné à une machine de production et/ou de traitement d'un voile de matière fibreuse, ledit composant comprenant un corps principal (2) et au moins une couche fonctionnelle (4) métallique appliquée au moins indirectement sur celui-ci, l'au moins une couche fonctionnelle (4) comportant une phase dure (4.2) et une phase liante (4.1), caractérisé en ce que la phase dure (4.2) comporte au moins des premières et deuxièmes particules de phase dure (4.2.1, 4.2.2) qui diffèrent par leur granularité moyenne de façon à obtenir au moins une distribution granulométrique bimodale des particules de phase dure (4.2.1, 4.2.2) dans la couche fonctionnelle (4).
  2. Composant selon la revendication 1, caractérisé en ce que la granulométrie moyenne des premières particules de phase dure (4.2.1) est au moins deux fois supérieure à la granulométrie moyenne des deuxièmes particules de phase dure (4.2.2).
  3. Composant selon la revendication 1 ou 2, caractérisé en ce que la granulométrie moyenne des deuxièmes particules de phase dure (4.2.2) est choisie de manière à être inférieure à l'intervalle moyen entre les premières particules de phase dure (4.2.1).
  4. Composant selon l'une des revendications 1 à 3, caractérisé en ce que les premières et deuxièmes particules de phase dure (4.2.1, 4.2.2) sont identiques en termes de matière.
  5. Composant selon l'une des revendications 1 à 4, caractérisé en ce que la couche fonctionnelle métallique (4) est un cermet.
  6. Composant selon l'une des revendications 1 à 5, caractérisé en ce que les particules de phase dure (4.2.1, 4.2.2) comprennent des carbures, des nitrures ou des borures du 4ème, 5ème ou 6ème groupe principal du tableau périodique et des mélanges de ceux-ci, tels que le carbure de tungstène (WC), ou une céramique ou une céramique oxydée, telle que l'oxyde d'aluminium (Al2O3) ou le dioxyde de zirconium (ZrO2), ou sont produites à partir de ceux-ci et la phase liante (4.2) comprennent un métal, un alliage métallique, tel que le cobalt (Co) ou le nickel-chrome (NiCr), ainsi que leurs mélanges ou sont produites à partir de ceux-ci.
  7. Composant selon l'une des revendications 1 à 6, caractérisé en ce que le composant est une racle, par exemple d'un racleur de nettoyage, destinée de préférence à racler un rouleau, d'une spatule ou d'une lame de crêpage.
  8. Composant selon l'une des revendications 1 à 6, caractérisé en ce que le composant est un rouleau, tel qu'un rouleau de calandre ou un cylindre de séchage, de préférence un rouleau chauffé, ou pouvant être chauffé, d'une machine de production et/ou de traitement d'un voile de matière fibreuse.
  9. Composant selon l'une des revendications 1 à 8, caractérisé en ce que la couche fonctionnelle (4) comprend 70 à 90 % en poids de particules de phase dure (4.2.1) formant la phase dure (4.2) et 10 à 30 % en poids de particules de phase liante formant la phase liante (4.1).
  10. Utilisation d'une poudre à pulvériser dans la production d'une couche fonctionnelle (4) destinée à un composant d'une machine de production et/ou de traitement d'un voile de matière fibreuse, la poudre à pulvériser étant un mélange de particules de phase dure (4.2.1, 4.2.2) et de particules de phase liante afin de former une phase liante (4.1) et une phase dure (4.2) dans la couche fonctionnelle finie (4), caractérisée en ce que les particules de phase dure (4.2.1, 4.2.2) comprennent au moins des premières et deuxièmes particules de phase dure (4.2.1, 4.2.2) qui diffèrent par leur granulométrie moyenne.
  11. Utilisation selon la revendication 10, caractérisée en ce que la granulométrie moyenne des premières particules de phase dure (4.2.1) est supérieure à la granulométrie moyenne des deuxièmes particules de phase dure (4.2.2) de manière à obtenir au moins une distribution granulométrique bimodale des particules de phase dure (4.2.1, 4.2.2) dans le mélange.
  12. Utilisation selon la revendication 10 ou 11, caractérisée en ce que la granulométrie moyenne des premières particules de phase dure (4.2.1) est au moins deux fois supérieure à la granulométrie moyenne des deuxièmes particules de phase dure (4.2.2).
  13. Utilisation selon l'une des revendications 10 à 12, caractérisée en ce que les premières et deuxièmes particules de phase dure (4.2.1, 4.2.2) sont identiques en termes de matière.
  14. Utilisation selon l'une des revendications 10 à 13, caractérisée en ce que les particules de phase dure (4.2.1, 4.2.2) comprennent des carbures, des nitrures ou des borures du 4ème, 5ème ou 6ème groupe principal du tableau périodique et des mélanges de ceux-ci, tels que le carbure de tungstène (WC), ou une céramique ou une céramique oxydée, telle que l'oxyde d'aluminium (Al2O3) ou le dioxyde de zirconium (ZrO2), ou sont produites à partir de ceux-ci et les particules de phase liante comprennent un métal, un alliage métallique, tel que le cobalt (Co) ou le nickel-chrome (NiCr), ainsi que des mélanges de ceux-ci ou sont produites à partir de ceux-ci.
  15. Utilisation selon l'une des revendications 10 à 14, caractérisée en ce que la poudre à pulvériser comprend 70 à 90 % en poids de particules de phase dure (4.2.1) formant la phase dure (4.2) et 10 à 30 % en poids de particules de phase liante formant la phase liante (4.1).
EP16177481.5A 2015-07-02 2016-07-01 Composant pour une machine destinee a fabriquer et/ou a traiter une bande de matiere fibreuse et utilisation d'une poudre à pulvériser pour produire une couche fonctionelle pour un composant pour une machine destinee a fabriquer et/ou a traiter une bande de matiere fibreuse Active EP3112531B1 (fr)

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DE102015212399.5A DE102015212399A1 (de) 2015-07-02 2015-07-02 Bauteil für eine Maschine zur Herstellung und/oder Behandlung einer Faserstoffbahn

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CN112593446B (zh) * 2020-11-25 2023-11-10 四川成发造纸机械有限公司 一种可调节喷淋角度的造纸用喷淋机构
DE102022121998A1 (de) 2022-08-31 2024-02-29 Voith Patent Gmbh Walze und Pressvorrichtung

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EP0035043A1 (fr) * 1980-02-28 1981-09-09 Scm Corporation Poudres d'alliage autofondantes pour la pulvérisation et la fusion, procédé pour préparer les poudres et objets revêtus avec ces poudres
US5171404A (en) * 1990-11-30 1992-12-15 S. D. Warren Company Method and apparatus for calendering paper with internally heated roll
US7799111B2 (en) * 2005-03-28 2010-09-21 Sulzer Metco Venture Llc Thermal spray feedstock composition
US7544412B2 (en) * 2006-02-28 2009-06-09 Schlumberger Technology Corporation Reducing abrasive wear in wear resistant coatings
US8465602B2 (en) * 2006-12-15 2013-06-18 Praxair S. T. Technology, Inc. Amorphous-nanocrystalline-microcrystalline coatings and methods of production thereof
DE102013201740A1 (de) * 2013-02-04 2014-04-10 Voith Patent Gmbh Schaberklinge
US20150114720A1 (en) * 2013-10-24 2015-04-30 Smith International, Inc. Inhibition of Microfissure Formation in Wear Resistant Coatings

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