EP3177750A1 - Surveillance et commande d'une opération de revêtement avec distribution de chaleur sur la pièce - Google Patents

Surveillance et commande d'une opération de revêtement avec distribution de chaleur sur la pièce

Info

Publication number
EP3177750A1
EP3177750A1 EP15775425.0A EP15775425A EP3177750A1 EP 3177750 A1 EP3177750 A1 EP 3177750A1 EP 15775425 A EP15775425 A EP 15775425A EP 3177750 A1 EP3177750 A1 EP 3177750A1
Authority
EP
European Patent Office
Prior art keywords
coating
workpiece
heat distribution
heat
detected
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.)
Granted
Application number
EP15775425.0A
Other languages
German (de)
English (en)
Other versions
EP3177750B1 (fr
Inventor
Arturo Flores Renteria
Sascha Martin Kyeck
Catrina Michel
Alexandr Sadovoy
Tolga YAGCI
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.)
Siemens Energy Global GmbH and Co KG
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP3177750A1 publication Critical patent/EP3177750A1/fr
Application granted granted Critical
Publication of EP3177750B1 publication Critical patent/EP3177750B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • C23C4/12—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
    • 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

Definitions

  • the invention relates to a method for coating a workpiece using a spray device and an apparatus for carrying out the method according to the invention.
  • the workpiece to be coated may in particular be a turbine blade or another component located in a hot gas path of a gas turbine.
  • Thermally and mechanically highly loaded components as in ⁇ game as turbine components and here in particular turbine nenschaufein are generally coated with a coating material to increase the temperature resistance and / or abrasion resistance of the workpiece.
  • Typical coatings used to coat turbine blades are so-called MCrAlX coatings, where M is a metal such as iron (Fe), cobalt (Co) or nickel (Ni), Cr for chromium, Al for aluminum and X for Yttrium (Y) and / or silicon (Si), scandium (Sc) and / or at least one rare earth element or hafnium.
  • ceramic heat insulating layers such as zirconium oxide, its structure at least partially stabilized by yttrium oxide is stabilized.
  • the coatings described are applied to the components to be coated by means of spraying. Examples of such
  • Spraying processes are high speed flame spraying and plasma spraying.
  • Coatings by spraying may cause stochastic process deviations during coating.
  • Object of the present invention is therefore to provide an advantageous method and an advantageous device for loading layers ⁇ a workpiece using a sprayer available which permit a rapid response to deviations of the coating produced by the desired coating properties.
  • the invention therefore introduces an improved method for coating a workpiece using a spray device.
  • the coating of the workpiece are performed in accordance with at least one coating parameters and at least the following steps being ⁇ leads during coating:
  • the invention is based on the insight and includes that the course of the coating process can be monitored and controlled by detecting the heat input to or into the workpiece due to the spray of the spray device to ensure the achievement of the desired coating properties of the finished coating ,
  • the spray or the transported therein coating material coating process in usual loading such as high velocity oxy-fuel ⁇ zen or plasma spraying during the spraying or injection process strongly heated, so that the spatial distribution and the mass or density of the surface of the tool Evaluate piece of adhering coating material on the basis of a heat ⁇ image and compare between different coating operations on workpieces of the same type. In exceptional cases, it may happen that the workpiece has a higher temperature than the sprayed coating material.
  • the method according to the invention can be used before ⁇ geous, wherein instead of a heat ⁇ entry results in a corresponding local cooling. Nevertheless, in the following, heat input and heat distribution are mentioned, although the exceptions mentioned should not be excluded.
  • the temperature of the workpiece when carrying out the method according to the invention, it is advantageous to bring the temperature of the workpiece to a specific value in order to create reproducible conditions for different coating processes of specimens of the same workpiece type. More preferably, the workpiece to be coated on the selected Tempe ⁇ temperature can be maintained by controlling the temperature determined and the workpiece is heated accordingly or cooled.
  • the spray of the spraying device and thus the working area is usually guided along a predetermined path over the surface of the workpiece (of course, in principle, the workpiece can also be guided along the spraying device).
  • the work area designates that area of the surface of the workpiece in which the coating material is being sprayed. Driving in a fully automated comparison this path remains the same for each workpiece of the same type, which is why the heat input into the workpiece through the spray should be uniform when the pre give ⁇ NEN coating parameters are met. If a deviation of the detected thermal distribution of the expected heat distribution determined can be adjusted at least one of Be ⁇ coating parameters to process the coating as close as possible to perform the following specifications.
  • the detected heat distribution can be compared to vomit ⁇ cherten reference heat distributions. From the stored reference heat distributions, one of the detected heat distribution most closely resembling reference heat distribution is then selected. The at least one coating parameter is finally adjusted as a function of a coating parameter data record assigned to the selected reference heat distribution.
  • the coating parameter data set of the reference heat distribution which most closely resembles the detected heat distribution and the current at least one coating parameter used for the coating.
  • the current at least one coating parameter can then be adjusted as a function of this difference.
  • the degree of adjustment of the at least one parameter per coating may be ⁇ proportional to the difference.
  • kos ⁇ material samples for example kacheiförmige material samples coated with different coating processing parameters and the properties of the thus-preserved ER- coatings are evaluated.
  • the stored reference heat distributions may be divided into a plurality of groups, each of the groups being associated with a respective surface region of the workpiece.
  • the sensed heat distribution may be compared to the group of stored reference heat distributions associated with the surface region of the workpiece in which the work area for which the sensed heat distribution was sensed is located.
  • This features can as example ⁇ , the local geometry or other characteristics of the workpiece, the variable coating properties be ⁇ hire and therefore require specific coating parameters are considered in the coating of the workpiece.
  • Each stored reference heat distribution is preferably assigned a rating which contains a statement about at least one coating property, in particular about a coating porosity, a coating roughness or a coating thickness.
  • the detected based on the detected heat distribution variations of the coating process of the specification can be evaluated based on their expected impact on the resulting loading stratification properties. This makes it possible to make a prediction about the quality of the coated work ⁇ tee and can in controlling the coating processing, for example when adjusting the least ⁇ least one coating parameter, are taken into account.
  • the heat distribution in the working area of the surface of the workpiece can be detected with a pyrometer or an infrared camera.
  • a sufficiently thin workpieces it is also possible with a sufficiently thin workpieces to detect the heat distribution based on arranged on the back of the workpiece temperature Messele ⁇ elements.
  • the at least one coating parameter may comprise at least one coating parameter selected from the group of plasma tension, powder feed rate of the coating material or composition of a plasma gas.
  • a second aspect of the invention relates to a device for coating a workpiece.
  • the device is equipped with a spray device, a heat meter and a control unit connected to the spray device and the heat meter.
  • the control unit is designed to carry out the method according to the invention. Brief description of the pictures
  • FIG 1 shows an embodiment of the invention
  • FIG. 4 shows a combustion chamber 110 of a gas turbine.
  • Figure 1 shows an embodiment of the method according to the invention in the form of a flow chart.
  • the method be ⁇ begins in a start step Sl.
  • Step S2 sets a workpiece to be coated and a web lumege- determined along which the Sprühvor ⁇ direction is guided over the surface of the workpiece.
  • Au ⁇ ßerdem be selected or of the relevant coating parameters according to the applied coating and its desired properties and preset.
  • This coating parameters may include using a plasma-based coating process, in particular a feed rate of the coating material, a plasma voltage or together ⁇ men attitude the plasma gas.
  • the coating process is started or carried out according to the predetermined coating parameter (s).
  • the coating process can be carried out continuously or interrupted regularly for carrying out the further method steps S4 to S10. However, because of the shorter process time, continuous coating is preferred.
  • step S4 a heat distribution of the work area on the surface of the workpiece is detected. This is preferably with an imaging process is performed, which determines a jewei ⁇ celled temperature for the various locations of the surface of the workpiece. The higher the resolution of the image ⁇ imaging method, the more accurate the heat distribution can be assessed.
  • step S5 the detected heat distribution is compared with a plurality of reference heat distributions.
  • a group of reference heat distributions from the total reference heat distributions are selected for comparison, which is considered representative of the currently coated partial surface of the workpiece.
  • the reference heat distribution which is most similar to the detected heat distribution is determined. Thereupon will be in
  • the coating parameter data set reflects those coating parameters which have led to the assigned reference heat distribution during a trial run of the coating process. Since the respectively resulting heat ⁇ distribution depends deviate from the actual coating parameters, so on the consideration of the reference heat distribution determined associated coating parameters is deduced, the actual values of the coating parameters of the current coating process.
  • step S7 a deviation between the associated coating parameter data set and the predetermined coating parameter (s) is determined. In this case, it is assumed that the predetermined at least one coating parameter is not adhered to by the spray device if a detected heat distribution deviating from the expectation has occurred.
  • step S8 is calculated in step S8 as a function of the previously determined deviation a correction value or a set of correction values by which the tendonss we ⁇ a coating parameters is adjusted in step S9.
  • the adaptation of the at least one coating parameter is intended to ensure that the coating process is carried out more precisely in accordance with the specifications.
  • step S10 it is checked whether the end of the web along which the workpiece is coated has been reached. If this is not the case, the coating ⁇ process and the inventive method is continued by branching back to step S3; otherwise the United ⁇ will go in step Sil ended. Subsequently, a sub- search for the properties of the coating and, if appropriate, adjustments to the coating parameter data records assigned to the reference heat distributions. It is also conceivable to provide from the proceedings detected during the execution of the encryption heat distributions and select one or more further process runs as a reference ⁇ heat distribution modes. For this purpose, the detected heat distributions and the associated respective coating parameter (s) can be stored during a process execution. In particular, the validity of the individual (reference) is also thinking ⁇ bar to assess heat is evenly ⁇ lungs and accessible via a variety of methods passages improved reproducibility of the coating process.
  • FIG. 2 shows by way of example a gas turbine 100 in a partial longitudinal section.
  • the inventive method is in particular ⁇ special for the coating of components of such a gas turbine 100 suitable.
  • the gas turbine 100 has a rotatably mounted about a rotational axis 102 ⁇ rotor 103 having a shaft 101, which is also referred to as the turbine rotor.
  • a compressor 105 for example, a toroidal combustion chamber 110, in particular annular combustion chamber, with a plurality of coaxially arranged burners 107, a turbine 108 and the exhaust housing 109th
  • the annular combustion chamber 110 communicates with an annular annular hot gas channel 111, for example.
  • annular annular hot gas channel 111 for example.
  • turbine stages 112 connected in series form the turbine 108.
  • Each turbine stage 112 is formed, for example, from two blade rings ⁇ .
  • a row 125 formed of rotor blades 120 follows.
  • the guide vanes 130 are fastened to an inner housing 138 of a stator 143, whereas the moving blades 120 of a row 125 are attached to the rotor 103 by means of a turbine disk 133, for example.
  • Coupled to the rotor 103 is a generator or a work machine (not shown).
  • substrates of the components can have a directional structure, ie they are monocrystalline (SX structure) or have only longitudinal grains (DS structure).
  • SX structure monocrystalline
  • DS structure longitudinal grains
  • iron-, nickel- or cobalt-based superalloys are used.
  • Such superalloys are known, for example, from EP 1 204 776 B1, EP 1 306 454, EP 1 319 729 A1, WO 99/67435 or WO 00/44949.
  • the blades 120, 130 may be anti-corrosion coatings (MCrAlX; M is at least one element of the group iron (Fe), cobalt (Co), nickel (Ni), X is an active element and is yttrium (Y) and / or silicon , Scandium (Sc) and / or at least one element of the rare earth or hafnium).
  • M is at least one element of the group iron (Fe), cobalt (Co), nickel (Ni)
  • X is an active element and is yttrium (Y) and / or silicon , Scandium (Sc) and / or at least one element of the rare earth or hafnium.
  • Such alloys are known from EP 0 486 489 B1, EP 0 786 017 B1, EP 0 412 397 B1 or EP 1 306 454 A1.
  • a thermal barrier coating may still be present on the MCrAlX, consisting for example of ZrO 2, Y 2 O 3 -ZrO 2, i. it is not, partially or completely stabilized by yttrium oxide and / or calcium oxide and / or magnesium oxide.
  • Electron beam evaporation produces stalk-shaped grains in the thermal barrier coating.
  • the guide blade 130 has a guide blade root facing the inner housing 138 of the turbine 108 (not shown here) and a guide blade foot opposite
  • the vane head faces the rotor 103 and fixed to a mounting ring 140 of the stator 143.
  • 3 shows a perspective view of a rotor blade 120 or guide vane show ⁇ 130 of a turbomachine, which extends along a longitudinal axis of the 121st
  • the turbomachine may be a gas turbine of an aircraft or a power plant for power generation, a steam turbine or a compressor.
  • the blade 120, 130 has along the longitudinal axis 121 to each other, a securing region 400, an adjoining blade or vane platform 403 and a blade 406 and a blade tip 415.
  • the vane 130 having at its blade tip 415 have a further platform (not Darge ⁇ asserted).
  • a blade root 183 is formed, which serves for attachment of the blades 120, 130 to a shaft or a disc (not shown).
  • the blade root 183 is, for example, as a hammerhead out staltet ⁇ . Other designs as fir tree or Schissebwschwanzfuß are possible.
  • the blade 120, 130 has for a medium which flows past the scene ⁇ felblatt 406 on a leading edge 409 and a trailing edge 412th
  • Such superalloys are known, for example, from EP 1 204 776 B1, EP 1 306 454, EP 1 319 729 A1, WO 99/67435 or WO 00/44949.
  • the blade 120, 130 can be made by a casting process, also by directional solidification, by a forging process, by a milling process or combinations thereof. Workpieces with a single-crystal structure or structures are used as components for machines which are exposed during operation ho ⁇ hen mechanical, thermal and / or chemical stresses.
  • Such monocrystalline workpieces takes place e.g. by directed solidification from the melt.
  • These are casting processes in which the liquid metallic alloy is transformed into a monocrystalline structure, i. to the single-crystal workpiece, or directionally solidified.
  • dendritic crystals are aligned along the heat flow and form either a columnar grain structure (columnar, ie grains that run the entire length of the workpiece and here, in common parlance, referred to as directionally solidified) or a monocrystalline structure, ie the whole workpiece be ⁇ is made of a single crystal.
  • a columnar grain structure columnar, ie grains that run the entire length of the workpiece and here, in common parlance, referred to as directionally solidified
  • a monocrystalline structure ie the whole workpiece be ⁇ is made of a single crystal.
  • directionally solidified structures generally refers to single crystals that have no grain boundaries or at most small angle grain boundaries, as well as stem crystal structures that have grain boundaries running in the longitudinal direction but no transverse grain boundaries. These second-mentioned crystalline structures are also known as directionally solidified structures. Such methods are known from US Pat. No. 6,024,792 and EP 0 892 090 A1. Likewise, the blades 120, 130 may have coatings against corrosion or oxidation, e.g. B.
  • M is at least one element of the group consisting of iron (Fe), cobalt (Co), Ni ⁇ ckel (Ni), X is an active element and stands for yttrium (Y) and / or silicon and / or at least one element the rare earth, or hafnium (Hf)).
  • Such alloys are known from EP 0 486 489 B1, EP 0 786 017 Bl, EP 0 412 397 B1 or EP 1 306 454 A1.
  • the density is preferably 95% of the theoretical log ⁇ te.
  • the layer composition comprises Co-30Ni-28Cr-8A1-0, 6Y-0, 7Si or Co-28Ni-24Cr-10Al-0, 6Y.
  • nickel-based protective layers such as Ni-10Cr-12Al-0.6Y-3Re or Ni-12Co-21Cr-IIAl-O, 4Y-2Re or Ni-25Co-17Cr-10A1-0, 4Y-1 are also preferably used , 5Re.
  • thermal barrier coating which is preferably the outermost layer, and consists for example of Zr02, Y203-Zr02, ie it is not, partially ⁇ or fully stabilized by yttria
  • the thermal barrier coating covers the entire MCrAlX ⁇ layer.
  • Suitable coating processes such as electron beam evaporation (EB-PVD), produce stalk-shaped grains in the thermal barrier coating.
  • Other coating methods are conceivable, for example atmospheric plasma spraying (APS), LPPS, VPS or CVD.
  • APS atmospheric plasma spraying
  • LPPS LPPS
  • VPS VPS
  • CVD chemical vapor deposition
  • the heat insulation layer may have ⁇ porous, micro- or macro-cracked compatible grains for better thermal shock resistance.
  • the Thermal insulation layer is therefore preferably more porous than the
  • Refurbishment means that components 120, 130 may need to be deprotected after use (e.g., by sandblasting). This is followed by removal of the corrosion and / or oxidation layers or products. Optionally, even cracks in the component 120, 130 are repaired. This is followed by a re-coating of the component 120, 130 and a renewed use of the component 120, 130.
  • the blade 120, 130 may be hollow or solid. If the blade 120, 130 is to be cooled, it is hollow and also has, if necessary, film cooling holes 418 (indicated by dashed lines) on.
  • FIG. 4 shows a combustion chamber 110 of a gas turbine.
  • the combustion chamber 110 is configured, for example, as a so-called annular combustion chamber, in which a multiplicity of burners 107 arranged in the circumferential direction about a rotation axis 102 open into a common combustion chamber space 154, which generate flames 156.
  • the combustion chamber 110 is configured in its entirety as an annular structure, which is positioned around the axis of rotation 102 around.
  • the combustion chamber 110 is designed for a comparatively high temperature of the working medium M of about 1000 degrees Celsius to 1600 degrees Celsius.
  • the combustion chamber wall 153 is provided on its side facing the working medium M with an inner lining formed from heat shield elements 155.
  • Each heat shield element 155 is made of an alloy
  • M is at least one element of the group iron (Fe), cobalt (Co), nickel (Ni), X is an active element and stands for yttrium (Y) and / or Si ⁇ lizium and / or at least one element of rare earth, or hafnium (Hf).
  • MCrAlX means: M is at least one element of the group iron (Fe), cobalt (Co), nickel (Ni), X is an active element and stands for yttrium (Y) and / or Si ⁇ lizium and / or at least one element of rare earth, or hafnium (Hf).
  • Such alloys are known from EP 0 486 489 B1, EP 0 786 017 B1, EP 0 412 397 B1 or EP 1 306 454 A1.
  • a ceramic thermal barrier coating may be present and consists for example of
  • EB-PVD Electron beam evaporation
  • the heat insulation layer may have ⁇ porous, micro- or macro-cracked compatible grains for better thermal shock resistance.
  • Refurbishment means that heat shield elements 155 may be replaced after use by heat shielding elements 155
  • Protective layers must be freed (eg by sandblasting). This is followed by removal of the corrosion and / or oxidation layers or products. If necessary, cracks in the heat shield element 155 are also repaired. This is followed by a recoating of the heat shield elements 155 and a renewed use of the heat shield elements 155. Due to the high temperatures inside the combustion chamber 110 may also be provided for the heat shield elements 155 and for their holding elements, a cooling system. The heat shield elements 155 are then, for example, hollow and optionally have cooling holes (not shown) opening into the combustion chamber space 154.

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

Abstract

L'invention concerne un procédé de revêtement d'une pièce à l'aide d'un dispositif de pulvérisation. Selon l'invention, le revêtement de la pièce est effectué en fonction d'un ou de plusieurs paramètres de revêtement et pendant le revêtement selon au moins les étapes suivantes consistant à : • - détecter une distribution locale de chaleur dans une zone de travail d'une surface de la pièce; et • - adapter le ou les paramètres de revêtement en fonction de la distribution de chaleur détectée. L'invention concerne également un dispositif de revêtement d'une pièce.
EP15775425.0A 2014-10-06 2015-09-30 Surveillance et commande d'une opération de revêtement avec distribution de chaleur sur la pièce Not-in-force EP3177750B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014220180.2A DE102014220180A1 (de) 2014-10-06 2014-10-06 Überwachung und Steuerung eines Beschichtungsvorgangs anhand einer Wärmeverteilung auf dem Werkstück
PCT/EP2015/072543 WO2016055325A1 (fr) 2014-10-06 2015-09-30 Surveillance et commande d'une opération de revêtement avec distribution de chaleur sur la pièce

Publications (2)

Publication Number Publication Date
EP3177750A1 true EP3177750A1 (fr) 2017-06-14
EP3177750B1 EP3177750B1 (fr) 2020-11-25

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP15775425.0A Not-in-force EP3177750B1 (fr) 2014-10-06 2015-09-30 Surveillance et commande d'une opération de revêtement avec distribution de chaleur sur la pièce

Country Status (4)

Country Link
US (1) US10975463B2 (fr)
EP (1) EP3177750B1 (fr)
DE (1) DE102014220180A1 (fr)
WO (1) WO2016055325A1 (fr)

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DE102012021265A1 (de) * 2012-10-29 2014-04-30 Kennametal Inc. Verfahren und Vorrichtung zur berührungslosen und verschleißfreien Überwachung von Schweiß- und Spritzprozessen
DE102013223688A1 (de) 2013-11-20 2015-05-21 Siemens Aktiengesellschaft Verfahren und Vorrichtung zum automatisierten Aufbringen einer Spritzbeschichtung

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US20170321317A1 (en) 2017-11-09

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