EP1148243B1 - Plastic pump part with protection surface - Google Patents
Plastic pump part with protection surface Download PDFInfo
- Publication number
- EP1148243B1 EP1148243B1 EP20010710019 EP01710019A EP1148243B1 EP 1148243 B1 EP1148243 B1 EP 1148243B1 EP 20010710019 EP20010710019 EP 20010710019 EP 01710019 A EP01710019 A EP 01710019A EP 1148243 B1 EP1148243 B1 EP 1148243B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- component according
- plastic
- pump component
- plastic pump
- link layer
- 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.)
- Expired - Fee Related
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
- F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
Definitions
- the invention relates to plastic pump parts with a protective surface, especially pump rotors, joint parts or the like.
- Parts that are subjected to abrasive stress are conventionally made of metal made to ensure good wear resistance.
- Metal parts with a precisely machined surface are however, it is expensive to manufacture, since it usually involves a series of processing steps is required in order to be dimensioned precisely Finished part and to get a desired surface quality to achieve.
- Plastic parts can be with high accuracy and produce good surface quality inexpensively, for example by casting, pressing or others in this context known molding processes.
- a more wear-resistant around plastic parts It is known to give surface to the endangered Harden surfaces of a plastic part by some kind of varnish is applied to the plastic surface by heat treatment cures. With plastic glasses has this method has proven itself. For highly abrasive conditions, where e.g. the rotor is exposed to an eccentric screw pump, the hardening achieved with the aforementioned method is sufficient Plastic surface, however, by far not enough.
- JP 62-203988 A describes a rotor and a housing Pump, which consist of a fiber-reinforced plastic and with a layer of Ti deposited by ion plating or TiN are provided.
- DE 40 39 352 A1 describes a method and a device for the production of layers on plastic surfaces.
- a plastic surface first an adhesion-promoting primer, then an aluminum layer and finally a protective layer applied.
- the primer and the Protective layers consist of SiC or SiOC.
- the invention has for its object plastic pump parts to provide their wear resistance and / or corrosion resistance corresponds to that of metal parts.
- the top layer consists of a cobalt / Nickel / chrome / molybdenum mixture, made of tungsten carbide, chrome carbide, or an oxide ceramic material and is by means of high-speed flame spraying, Plasma or thermal spray powder spraying or applied by means of oxyacetylene flame spraying Service.
- the invention is based on the surprising finding underlying that by means of a metallic intermediate layer, the adheres well to the plastic core and is also excellent Primer for the actual wear and / or corrosion protection performing top layer forms, plastic pump parts can be produced, their wear resistance and / or corrosion resistance of those of metal parts not inferior.
- the wear and / or corrosion protection Top layer can be tailored to the desired To have surface properties. The above procedures have to apply the layers when coating of metal parts already proven and are experts on this Area known.
- the metallic connection layer consists of zinc with a purity of over 99%.
- the zinc preferably has one Purity of ⁇ 99.9%, especially a purity of 99.99%. ever the purer the zinc, the better the metallic connection layer adheres on the plastic core. Zinc with a purity of below 99% has proven unsuitable for the coating process exposed.
- the metallic connection layer made of an aluminum-silicon alloy.
- the aluminum-silicon alloy used preferably contains between 5 and 15 wt .-% silicon and as Rest aluminum.
- contamination by others Metals can be contained in usual amounts.
- it is not critical if up to 0.1% magnesium, 0.1% manganese, 0.5% Iron, 0.03% titanium, 0.03% copper, and / or 0.07% zinc in the Alloy are included.
- the relatively low melting point an aluminum-silicon alloy with the stated proportion Silicon is particularly beneficial since most plastics do not have a very high temperature resistance.
- Especially preferred aluminum-silicon alloys for the connection layer melt in a temperature range from 570 ° C to 615 ° C, especially in a temperature range from 570 ° C to 590 ° C.
- the material with material no. 3.2285 called.
- the layer thickness of the connecting layer is 25 ⁇ m to 150 ⁇ m and in particular 50 ⁇ m to 100 ⁇ m. If a certain Intended use or a certain material pairing require the layer thickness of the connection layer can be the specified But also fall below or exceed values.
- connection layer by means of arc spraying on the plastic core muster. With this type of application uniform connection layer thicknesses even on complicated molded plastic cores reach without the plastic material is too thermally stressed.
- the layers to be coated must be coated before the connection layer is applied Clean surfaces in the usual way, for example with industrial alcohol, or by targeted blasting activate.
- the cover layer consists of aluminum oxide or chromium oxide, can but also a composite layer made of different metal materials or be made of metal and oxide ceramic materials.
- the total layer thickness of the top layer is 50 ⁇ m to 400 ⁇ m, depending on the application of the coated plastic pump part and number of layers of material resulting in the top layer.
- the plastic core can in particular be made of polyether ether ketone (PEEK) or polyamide. Mixtures of these materials are suitable.
- the plastic pump parts according to the invention have comparable metal parts have a significantly lower weight and yet wear and / or corrosion resistance, which corresponds to those of the metal parts.
- the plastic pump parts according to the invention inexpensively manufacture, not least due to the weight-saving plastic core.
- the connection layer according to the invention enables only the application of wear and / or corrosion protection Top layer.
Description
Die Erfindung betrifft Kunststoffpumpenteile mit einer Schutzoberfläche, insbesondere Pumpenrotoren, Gelenkteile oder ahnliches.The invention relates to plastic pump parts with a protective surface, especially pump rotors, joint parts or the like.
Herkömmlicherweise werden abrasiv beanspruchte Teile aus Metall hergestellt, um eine gute Verschleißbeständigkeit zu gewährleisten. Metallteile mit einer präzis gearbeiteten Oberflache sind jedoch fertigungsaufwendig, da zumeist eine Reihe von Bearbeitungsschritten erforderlich ist, um zum genau dimensionierten Fertigteil zu gelangen und um eine gewünschte Oberflachenqualität zu erzielen.Parts that are subjected to abrasive stress are conventionally made of metal made to ensure good wear resistance. Metal parts with a precisely machined surface are however, it is expensive to manufacture, since it usually involves a series of processing steps is required in order to be dimensioned precisely Finished part and to get a desired surface quality to achieve.
Kunststoffteile hingegen lassen sich mit hoher Genauigkeit und guter Oberflächenqualität kostengünstig herstellen, beispielsweise durch Gießen, Pressen oder andere in diesem Zusammenhang bekannte Formverfahren. Um Kunststoffteilen eine verschleißbeständigere Oberfläche zu geben, ist es bekannt, die gefährdeten Flächen eines Kunststoffteils zu härten, indem eine Art Lack auf die Kunststoffoberfläche aufgetragen wird, der durch Warmebehandlung aushärtet. Bei Kunststoffbrillenglasern hat sich dieses Verfahren bewährt. Für stark abrasive Bedingungen, denen z.B. der Rotor einer Exzenterschneckenpumpe ausgesetzt ist, reicht die mit dem vorgenannten Verfahren erzielte Härtung der Kunststoffoberfläche allerdings bei weitem nicht aus.Plastic parts, however, can be with high accuracy and produce good surface quality inexpensively, for example by casting, pressing or others in this context known molding processes. A more wear-resistant around plastic parts It is known to give surface to the endangered Harden surfaces of a plastic part by some kind of varnish is applied to the plastic surface by heat treatment cures. With plastic glasses has this method has proven itself. For highly abrasive conditions, where e.g. the rotor is exposed to an eccentric screw pump, the hardening achieved with the aforementioned method is sufficient Plastic surface, however, by far not enough.
Aus der DE 1 687 476 ist eine Exzenterschneckenpumpe mit einem Rotor bekannt, der aus Kunststoff geformt und mit einer Hartverchromungsschicht versehen ist. Die Hartverchromungsschicht wird elektrolytisch auf einer auf chemischen Wege aufgebrachten Zwischenschicht aus Graphit oder Kupfer abgeschieden.From DE 1 687 476 an eccentric screw pump with a Known rotor, which is made of plastic and with a hard chrome plating is provided. The hard chrome plating layer is applied electrolytically in a chemical way Intermediate layer of graphite or copper deposited.
Die JP 62-203988 A beschreibt einen Rotor und ein Gehause einer Pumpe, die aus einem faserverstärkten Kunststoff bestehen und mit einer durch Ionenplattierten aufgebrachten Schicht aus Ti oder TiN versehen sind.JP 62-203988 A describes a rotor and a housing Pump, which consist of a fiber-reinforced plastic and with a layer of Ti deposited by ion plating or TiN are provided.
Die DE 40 39 352 A1 beschreibt ein Verfahren und eine Vorrichtung zur Herstellung von Schichten auf Kunststoffoberflachen. Durch ein PCVD-Beschichtungsverfahren wird auf einer Kunststoffoberfläche zunächst eine haftvermittelnde Vorschicht, anschließend eine Aluminiumschicht und zuletzt eine Schutzschicht aufgebracht. Die haftvermittelnde Vorschicht und die Schutzschicht bestehen jeweils aus SiC oder SiOC.DE 40 39 352 A1 describes a method and a device for the production of layers on plastic surfaces. By means of a PCVD coating process, a plastic surface first an adhesion-promoting primer, then an aluminum layer and finally a protective layer applied. The primer and the Protective layers consist of SiC or SiOC.
Der Erfindung liegt die Aufgabe zugrunde, Kunststoffpumpenteile bereitzustellen, deren Verschleißbeständigkeit und/oder Korrosionsbeständigkeit derjenigen von Metallteilen entspricht.The invention has for its object plastic pump parts to provide their wear resistance and / or corrosion resistance corresponds to that of metal parts.
Diese Aufgabe ist erfindungsgemäß mit Kunststoffpumpenteilen gelöst, die einen Kunststoffkern aufweisen, auf den eine metallische Verbindungsschicht aufgebracht ist, auf die wiederum eine verschleiß- und/oder korrosionbeständige Deckschicht aufgebracht ist. Die Deckschicht besteht aus einer Kobalt/ Nickel/Chrom/Molybdän-Mischung, aus Wolframcarbid, Chromcarbid, oder einem oxidkeramischen Werkstoff und ist mittels Hochgeschwindigkeits-Flammspritzen, Plasma -oder Thermo-Spray-Pulverspritzen oder mittels autogenem Stabflammspritzen aufgebracht worden. Der Erfindung liegt die überraschende Erkenntnis zugrunde, daß mittels einer metallischen Zwischenschicht, die gut am Kunststoffkern haftet und zugleich einen hervorragenden Haftgrund für die den eigentlichen Verschleiß- und/oder Korrosionsschutz darstellende Deckschicht bildet, Kunststoffpumpenteile hergestellt werden können, deren Verschleißbestandigkeit und/oder Korrosionsbeständigkeit derjenigen von Metallteilen nicht nachsteht. Die verschleiß- und/oder korrosionsschutzende Deckschicht kann maßgeschneidert werden, um die gewünschten Oberflächeneigenschaften aufzuweisen. Die oben genannten Verfahren zum Auftragen der Schichten haben sich beim Beschichten von Metallteilen bereits bewährt und sind Fachleuten auf diesem Gebiet bekannt. This object is according to the invention with plastic pump parts solved, which have a plastic core on one metallic connection layer is applied, in turn a wear and / or corrosion resistant top layer is applied. The top layer consists of a cobalt / Nickel / chrome / molybdenum mixture, made of tungsten carbide, chrome carbide, or an oxide ceramic material and is by means of high-speed flame spraying, Plasma or thermal spray powder spraying or applied by means of oxyacetylene flame spraying Service. The invention is based on the surprising finding underlying that by means of a metallic intermediate layer, the adheres well to the plastic core and is also excellent Primer for the actual wear and / or corrosion protection performing top layer forms, plastic pump parts can be produced, their wear resistance and / or corrosion resistance of those of metal parts not inferior. The wear and / or corrosion protection Top layer can be tailored to the desired To have surface properties. The above procedures have to apply the layers when coating of metal parts already proven and are experts on this Area known.
Zwei bestimmte metallische Verbindungsschichten haben sich als besonders geeignet erwiesen. Gemäß einer Ausführungsform der Erfindung besteht die metallische Verbindungsschicht aus Zink mit einer Reinheit von über 99%. Vorzugsweise hat das Zink eine Reinheit von ≥ 99,9%, insbesondere eine Reinheit von 99,99%. Je reiner das Zink ist, desto besser haftet die metallische Verbindungsschicht am Kunststoffkern. Zink mit einer Reinheit von unter 99% hat sich als ungeeignet für den Beschichtungsvorgang herausgestellt.Two specific metallic tie layers have been identified as proven particularly suitable. According to one embodiment of the Invention, the metallic connection layer consists of zinc with a purity of over 99%. The zinc preferably has one Purity of ≥ 99.9%, especially a purity of 99.99%. ever the purer the zinc, the better the metallic connection layer adheres on the plastic core. Zinc with a purity of below 99% has proven unsuitable for the coating process exposed.
Gemäß einer anderen Ausführungsform der Erfindung besteht die metallische Verbindungsschicht aus einer Aluminium-Silizium-Legierung. Vorzugsweise enthält die verwendete Aluminium-Silizium-Legierung zwischen 5 und 15 Gew.-% Silizium und als Rest Aluminium. Daneben können Verunreinigungen durch andere Metalle in üblichen Mengen enthalten sein. So ist es beispielsweise unkritisch, wenn bis zu 0,1% Magnesium, 0,1% Mangan, 0,5% Eisen, 0,03% Titan, 0,03% Kupfer, und/oder 0,07% Zink in der Legierung enthalten sind. Der relativ niedrige Schmelzpunkt einer Aluminium-Silizium-Legierung mit dem genannten Anteil an Silizium ist von besonderem Vorteil, da die meisten Kunststoffe keine sehr hohe Temperaturbeständigkeit aufweisen. Besonders bevorzugte Aluminium-Silizium-Legierungen für die Verbindungsschicht schmelzen in einem Temperaturbereich von 570 °C bis 615 °C, insbesondere in einem Temperaturbereich von 570 °C bis 590 °C.According to another embodiment of the invention, the metallic connection layer made of an aluminum-silicon alloy. The aluminum-silicon alloy used preferably contains between 5 and 15 wt .-% silicon and as Rest aluminum. In addition, contamination by others Metals can be contained in usual amounts. For example, it is not critical if up to 0.1% magnesium, 0.1% manganese, 0.5% Iron, 0.03% titanium, 0.03% copper, and / or 0.07% zinc in the Alloy are included. The relatively low melting point an aluminum-silicon alloy with the stated proportion Silicon is particularly beneficial since most plastics do not have a very high temperature resistance. Especially preferred aluminum-silicon alloys for the connection layer melt in a temperature range from 570 ° C to 615 ° C, especially in a temperature range from 570 ° C to 590 ° C.
Aluminium-Silizium-Legierungen der genannten Art haben eine Zugfestigkeit von 150 bis 180 N/mm, eine 0,2-Dehngrenze von 70 bis 80 N/mm, eine Dehnung (1 = 5 d) von 4 bis 8%, und eine elektrische Leitfähigkeit von ca. 20 m/(Ω x mm2). Als Beispiel für eine gut als Verbindungsschicht geeignete Aluminium-Silizium-Legierung sei hier der Werkstoff mit der Werkstoff-Nr. 3.2285 genannt.Aluminum-silicon alloys of the type mentioned have a tensile strength of 150 to 180 N / mm, a 0.2 proof stress of 70 to 80 N / mm, an elongation (1 = 5 d) of 4 to 8%, and an electrical Conductivity of approx. 20 m / (Ω x mm 2 ). As an example of an aluminum-silicon alloy that is well suited as a connecting layer, the material with material no. 3.2285 called.
Die Schichtdicke der Verbindungsschicht beuragz 25 µm bis 150 µm und insbesondere 50 µm bis 100 µm. Wenn ein bestimmter Einsatzzweck oder eine bestimmte Materialpaarung es erfordern, kann die Schichtdicke der Verbindungsschicht die angegebenen Werte aber auch unterschreiten oder überschreiten.The layer thickness of the connecting layer is 25 µm to 150 µm and in particular 50 µm to 100 µm. If a certain Intended use or a certain material pairing require the layer thickness of the connection layer can be the specified But also fall below or exceed values.
Auf besonders vorteilhafte Art und Weise lässt sich die genannte Verbindungsschicht mittels Lichtbogenspritzen auf den Kunststoffkern aufbringen. Mit dieser Aufbringungsart lassen sich gleichmäßige Verbindungsschichtdicken auch auf kompliziert geformten Kunststoffkernen erreichen, ohne daß das Kunststoffmaterial thermisch zu stark beansprucht wird.The aforementioned can be carried out in a particularly advantageous manner Connection layer by means of arc spraying on the plastic core muster. With this type of application uniform connection layer thicknesses even on complicated molded plastic cores reach without the plastic material is too thermally stressed.
Vor dem Aufbringen der Verbindungsschicht sind die zu beschichtenden Flächen in üblicher Weise zu reinigen, beispielsweise mit Industriealkohol, oder durch eine gezielte Strahlarbeit zu aktivieren.The layers to be coated must be coated before the connection layer is applied Clean surfaces in the usual way, for example with industrial alcohol, or by targeted blasting activate.
Gemäß einer anderen bevorzugten Ausführungsform der Erfindung besteht die Deckschicht aus Aluminiumoxid oder Chromoxid, kann aber auch eine Komposit-Schicht aus verschiedenen Metallwerkstoffen oder aus metall- und oxidkeramischen Werkstoffen sein.According to another preferred embodiment of the invention If the cover layer consists of aluminum oxide or chromium oxide, can but also a composite layer made of different metal materials or be made of metal and oxide ceramic materials.
Die Gesamtschichtdicke der Deckschicht beträgt 50 µm bis 400 µm, je nach Einsatzzweck des beschichteten Kunststoffpumpenteils und Zahl der die Deckschicht ergebenden Materialschichten.The total layer thickness of the top layer is 50 µm to 400 µm, depending on the application of the coated plastic pump part and number of layers of material resulting in the top layer.
Der Kunststoffkern kann insbesondere aus Polyetheretherketon (PEEK) oder Polyamid bestehen. Auch Mischungen dieser Materialien sind geeignet.The plastic core can in particular be made of polyether ether ketone (PEEK) or polyamide. Mixtures of these materials are suitable.
Die erfindungsgemäßen Kunststoffpumpenteile haben gegenüber vergleichbaren Metallteilen ein deutlich niedrigeres Gewicht und dennoch eine Verschleiß- und/oder Korrosionsbeständigkeit, die denen der Metallteile entspricht. Darüberhinaus lassen sich die erfindungsgemäßen Kunststoffpumpenteile kostengünstig herstellen, nicht zuletzt durch den gewichtssparenden Kunststoffkern. Die erfindungsgemäße Verbindungsschicht ermoglicht erst das Aufbringen der verschleiß- und/oder korrosionsschützenden Deckschicht.The plastic pump parts according to the invention have comparable metal parts have a significantly lower weight and yet wear and / or corrosion resistance, which corresponds to those of the metal parts. In addition, the plastic pump parts according to the invention inexpensively manufacture, not least due to the weight-saving plastic core. The connection layer according to the invention enables only the application of wear and / or corrosion protection Top layer.
Claims (12)
- Plastic pump component with a protective surface, particularly a pump rotor, a joint element or the like, comprisingcharacterised in that said top layer consists of a cobalt/nickel/chromium/molybdenum mixture, tungsten carbide, chromium carbide or an oxide-ceramic material and is applied by high-speed flame spray coating, plasma or thermo spray powder spraying or by means of autogenous rod flame spray coating.a plastic core,a metal link layer applied on said plastic core, anda wear-resistant and/or corrosion-resistant top layer applied on said link layer,
- Plastic pump component according to Claim 1,
characterised in that said metal link layer consists of zinc having a purity level better than 99 %. - Plastic pump component according to Claim 2,
characterised in that the zinc has a purity level of ≥ 99.9 %, specifically a purity level of 99.99 %. - Plastic pump component according to Claim 4,
characterised in that said metal link layer consists of an aluminium/silicon alloy. - Plastic pump component according to Claim 4,
characterised in that said aluminium/silicon alloy contains between 5 % and 15 % of silicon, with the balance being aluminium. - Plastic pump component according to Claim 4 or 5,
characterised in that said aluminium/silicon alloy melts within a temperature range from 570 °C to 615 °C, particularly within a temperature range between 570 °C and 590 °C. - Plastic pump component according to any of the preceding Claims,
characterised in that the thickness of said link layer amounts to 25 µm to 150 µm, particularly to 50 µm to 100 µm. - Plastic pump component according to any of the preceding Claims,
characterised in that said link layer is applied by an electric-arc spraying process. - Plastic pump component according to any of the preceding Claims,
characterised in that said top layer consists of aluminium oxide or chromium oxide. - Plastic pump component according to any of the preceding Claims,
characterised in that said top layer consists of several layers of different materials. - Plastic pump component according to Claim 1,
characterised in that the thickness of said top layer amounts to 50 µm to 400 µm. - Plastic pump component according to any of the preceding Claims,
characterised in that said plastic core consists of polyether ether ketone or polyamide.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10018977 | 2000-04-17 | ||
| DE10018977 | 2000-04-17 | ||
| DE10024849A DE10024849C1 (en) | 2000-04-17 | 2000-05-19 | Plastic pump part with protective surface |
| DE10024849 | 2000-05-19 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1148243A2 EP1148243A2 (en) | 2001-10-24 |
| EP1148243A3 EP1148243A3 (en) | 2002-12-18 |
| EP1148243B1 true EP1148243B1 (en) | 2004-06-23 |
Family
ID=26005347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20010710019 Expired - Fee Related EP1148243B1 (en) | 2000-04-17 | 2001-04-12 | Plastic pump part with protection surface |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1148243B1 (en) |
| JP (1) | JP2001355057A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11401932B2 (en) * | 2018-12-20 | 2022-08-02 | Audi Ag | Screw pump with abradable coating |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006077873A (en) * | 2004-09-09 | 2006-03-23 | Jtekt Corp | Universal joint |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1678476B1 (en) | 1963-08-06 | 1970-02-12 | Eugen Soeding | Eccentric screw pump |
| JPS62203988A (en) | 1986-02-28 | 1987-09-08 | Inoue Japax Res Inc | Pump |
| US5120204A (en) * | 1989-02-01 | 1992-06-09 | Mono Pumps Limited | Helical gear pump with progressive interference between rotor and stator |
| DE4039352A1 (en) | 1990-12-10 | 1992-06-11 | Leybold Ag | METHOD AND DEVICE FOR PREPARING LAYERS ON SURFACES OF MATERIALS |
| US5395221A (en) * | 1993-03-18 | 1995-03-07 | Praxair S.T. Technology, Inc. | Carbide or boride coated rotor for a positive displacement motor or pump |
| US5498142A (en) * | 1995-05-30 | 1996-03-12 | Kudu Industries, Inc. | Hardfacing for progressing cavity pump rotors |
-
2001
- 2001-04-11 JP JP2001112680A patent/JP2001355057A/en active Pending
- 2001-04-12 EP EP20010710019 patent/EP1148243B1/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11401932B2 (en) * | 2018-12-20 | 2022-08-02 | Audi Ag | Screw pump with abradable coating |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001355057A (en) | 2001-12-25 |
| EP1148243A2 (en) | 2001-10-24 |
| EP1148243A3 (en) | 2002-12-18 |
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