WO2004033747A1 - Hvof溶射ガンによる金属皮膜形成方法と溶射装置 - Google Patents
Hvof溶射ガンによる金属皮膜形成方法と溶射装置 Download PDFInfo
- Publication number
- WO2004033747A1 WO2004033747A1 PCT/JP2003/012983 JP0312983W WO2004033747A1 WO 2004033747 A1 WO2004033747 A1 WO 2004033747A1 JP 0312983 W JP0312983 W JP 0312983W WO 2004033747 A1 WO2004033747 A1 WO 2004033747A1
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- WO
- WIPO (PCT)
- Prior art keywords
- shroud
- gas
- spray gun
- inert gas
- sprayed
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
- B05B7/20—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion
- B05B7/201—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion downstream of the nozzle
- B05B7/205—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion downstream of the nozzle the material to be sprayed being originally a particulate material
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- 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 present invention employs a thermal spraying technique for forming a corrosion-resistant sprayed metal film by thermal spraying, imparting corrosion resistance, abrasion resistance, etc. to the substrate surface and extending the life of structures and various industrial equipment.
- HVOF Thermal Spraying technique
- Another method of corrosion protection based on other principles is to coat a material that is more electrochemically lower than iron, such as zinc and aluminum, and selectively elute these materials to protect the steel base material.
- Anticorrosion methods have also been put to practical use. In this case, the pores of the film do not matter, but if the resin is impregnated, it will prevent corrosion. It is said that the life will be long. However, depending on the mechanical strength and environment of the film, there is a problem that the dissolution rate is rather increased and the life of the designed product is shortened.
- HVOF thermal spraying method in which a material powder is hardly melted, but is softened and projected onto a substrate at a high speed, and the powder is instantaneously bonded by kinetic energy to form a coating, has been commercialized. It has been noticed. At present, this technology is most often applied to WC—Co abrasion-resistant coatings. The reason is that tungsten carbide WC is easily decomposed when exposed to high temperature such as plasma, whereas HVOF is hardly decomposed at the maximum heat source temperature of about 2500 ⁇ in HVOF. In addition, a dense film is formed at a high speed. Based on these examples, HVOF has the feature of being able to form a dense barrier-type film in the atmosphere, and has the potential to form a dense film of a corrosion-resistant material.
- the present invention is to basically solve such a conflicting problem based on existing means and by simple means. That is, it is intended to obtain a dense and low-oxidation thermal sprayed metal coating without overheating by using HVOF spraying means. Disclosure of the invention
- the present inventors have attached a cylindrical attachment (hereinafter referred to as a gas shroud or simply a shroud) to a commercially available HVOF spray gun, and supplied a large amount of inert gas therein.
- a gas shroud or simply a shroud
- the present invention can basically be achieved by using a shield method, which is already used in the field of plasma spraying, in addition to the HVOF spray gun, and combining the two means.
- the present invention has been made based on this series of findings, and an object of the present invention is to provide an HVOF spraying method having excellent features and a spraying apparatus therefor.
- a first solution of the present invention is a method of forming a metal film by using an HVOF spray gun, wherein a gas shroud having a tubular portion having a shape corresponding to the barrel tubular portion is mounted on a barrel tubular portion of the spray gun.
- an inert gas is supplied to the inner space of the shroud so as to suppress oxidation and energize the particle speed, so that the substrate is not overheated without overheating.
- a method of forming a metal film by using a HVOF spray gun that accelerates and collides particles to form a dense sprayed film having a low oxygen content at a relatively low temperature, wherein an inert gas is contained in the gas shroud internal space.
- Is formed by a circumferentially formed slit which is adjusted by a thermal spray gun to urge the velocity of the metal particles sprayed by the thermal spray gun and to prevent air from entering.
- the gas shroud used here has already been used in high temperature spraying, for example, plasma spraying.
- the purpose of using a gas shroud was only to control the atmosphere and to prevent the oxidation of the sprayed metal (Japanese Patent Application Laid-Open No. 08-224646-2). ),
- a second solution of the present invention is that a spray formed on a circumferentially formed slit for supplying an inert gas into the gas shroud internal space is sprayed.
- a method of forming a metal film characterized in that an inclination is provided in a direction in which the metal particles are ejected, and an inert gas is supplied to the inner space of the shroud along the inclination.
- a third solution provides a method for forming a metal film, wherein the inclination is inclined within 70 ° with respect to a line perpendicular to the central axis of the shroud cylinder.
- a fourth solution is that the means for supplying the inert gas, which is constituted by a slit formed in a circumferential shape, is arranged at a plurality of locations in the length direction of the gas shroud.
- the fifth solution is to provide a metal film forming method characterized in that the slits are provided at least at two positions, a spray gun barrel outlet portion and a gas shroud outlet portion. I will provide a.
- a sixth solution of the present invention is to provide a HVOF spraying gun and a tubular gas shroud having a shape corresponding to the barrel tubular portion detachably attached to a barrel barrel of the HVOF spraying gun.
- a gas spraying apparatus comprising: means for supplying an inert gas to a shroud internal space so as to suppress oxidation of metal particles sprayed from a spray gun and to increase particle velocity.
- the means for supplying the inert gas to the internal space is constituted by a slit formed on the circumference, energizing the velocity of the metal particles sprayed from the spray gun to prevent the air from entering.
- a thermal spraying apparatus characterized in that the thermal spraying apparatus is adjusted to a specific temperature.
- a seventh solution is that the circumferentially formed slit is provided with a slope in the direction in which the metal particles to be sprayed are ejected, and the inert gas is shrouded along the slope.
- the present invention provides a thermal spraying device characterized by being supplied to the internal space. Eighth, the inclination is inclined within 70 ° with respect to a line perpendicular to the central axis of the shroud cylinder. A thermal spraying device is provided.
- the slit is a gas shroud.
- slits are provided at at least two places: the spray gun barrel outlet and the gas shroud outlet.
- a thermal spraying device is provided.
- the cylindrical gas shroud is attached to the barrel of the HVOF spray gun, and the sprayed metal particles are densely and oxygen-containing without overheating the substrate by the inert gas supplied into the gas shroud. It controls the formation of a low-volume sprayed metal coating, and with this unique configuration, it has the unique effect of being able to obtain a dense, low-oxygen metal coating. is there.
- the present invention has succeeded in realizing a dense, low-oxygen-content sprayed metal coating with reproducibility by the above-described configuration, and has a wide-ranging impact on various industrial fields, despite its technical significance. It is a very basic and important invention that has significant social and economic effects and is of very high value.
- Figure 1 is the principle diagram of the high-speed flame (HOVF) thermal spraying device.
- HOVF high-speed flame
- FIG. 2 is a diagram for explaining the principle of thermal spraying with a gas-heated HOVF spraying apparatus.
- FIG. 3 is a structural explanatory view illustrating an embodiment of the gas shroud.
- FIG. 4 is a diagram showing the relationship between the porosity and the oxygen content in the sprayed stainless steel films obtained under various conditions.
- FIG. 5 is a diagram showing the relationship between the average particle velocity of the sprayed particles and the porosity of the coating.
- Fig. 6 is a graph showing the relationship between the amount of iron (the metal underlying the spray coating layer of the eight-steroid alloy) ion elution and the spraying conditions.
- FIG. 1 is a schematic diagram for explaining the principle of high-speed flame (HVOF) spraying.
- the spray gun consists of a combustion chamber, a nozzle, and a barrel. Fuel and oxygen are mixed and ignited in the combustion chamber, and the generated combustion flame passes through a divergent nozzle after being throttled once at the throat. It is discharged through the straight barrel section. Gases such as hydrogen, acetylene and propane and liquid fuels such as kerosene are used as fuel.
- the raw material powder is blown into the combustion flame by the carrier gas using negative pressure at the divergent nozzle outlet, heated and accelerated in the barrel and released into the atmosphere, usually flying about 20 to 40 cm in the atmosphere. Deposits on the substrate to form a film. It should be noted that a mechanical supply means may be used in place of the supply means of the raw material powder by the negative pressure.
- FIG. 2 is a schematic diagram illustrating the principle of the present invention in a state where a shroud is attached to the HVOF spray gun shown in FIG.
- FIG. 3 is a schematic diagram showing an embodiment of the present invention in which the mounting relationship between the gas shroud having the water-cooled double pipe structure and the spray gun in FIG. 2 is enlarged.
- a gas having a barrel having a shape corresponding to the barrel barrel is provided on the barrel barrel of the spray gun.
- a shroud is installed, and an inert gas is supplied to the inner space of the shroud so as to suppress oxidation and energize the particle speed of the metal particles sprayed from the spray gun without overheating the substrate.
- the inside of the gas shroud is used.
- the means for supplying the inert gas to the space is It is characterized by being a means that can be adjusted to urge the velocity of the metal particles sprayed by the spray gun to prevent mixing of air.
- the inert gas supply means is a slit formed in a circumferential shape. Due to the circumferential slit, the inert gas blown from here forms a kind of double-layered accelerating flow so as to cover the periphery of the jet of metal particles to be sprayed. Energizes the velocity of the metal particles to be applied, and acts to effectively suppress the influence of oxygen due to air mixing.
- the slit is formed over the entire circumference, but the slit may be intermittently arranged on the circumference.
- a plurality of holes may be provided.
- these arrangements have substantially uniform intervals and lengths (sizes) of the respective slits.
- the inclination angle is preferably within 70 ° with respect to a line orthogonal to the central axis of the shroud cylinder.
- Such slits can be provided at a plurality of locations in the length direction of the gas shroud.
- the number of slits and the number of slits, as well as the gas shroud length, must be determined in consideration of the spray velocity of the sprayed metal particles, the flow rate and flow rate of the inert gas, and the thickness and characteristics of the metal coating. it can.
- all the slits may or may not be provided with the above-mentioned inclined surface, but it is effective to provide at least one slit. is there. In this case, it is more preferable that at least two of the spray gun barrel outlet and the gas shroud outlet are provided. It is considered that the slit at the outlet of the spray gun barrel is provided with the above-mentioned inclined surface.
- the embodiment illustrated in FIG. 3 shows an example of such a gas shroud.
- the inert gas (1) and the inert gas (2) are supplied to the shroud interior space from two places, the inert gas (1) and the inert gas (1).
- the gas supply port is formed by a slit formed over the entire circumference, and this slit is arranged near the outlet of the spray gun barrel and does not obstruct the flow of the combustion flame. It is provided with an inclined surface at an appropriate angle in the direction in which the combustion flame is ejected.
- Another inert gas (2) is for suppressing the incorporation of oxygen from the atmosphere and is supplied from a slit provided near the outlet of the gas shroud.
- the slit for supplying the inert gas (2) has no inclined surface.
- the inert gas used includes a rare gas such as argon or nitrogen. It is also effective to make the inside diameter of the shroud gradually increase from the spray barrel outlet to the shroud outlet as shown in the example of Fig. 3. That is, it is set so as to have a divergent taper in the shroud outlet direction.
- the first reason why such a structure with an inner diameter gradually expanded in the direction of the outlet of the shroud is effective is that the combustion jet gradually expands toward the atmospheric pressure at the outlet, so that there is little turbulence in the flow, It is unlikely that the speed will decrease.
- the second reason is that if the diameter remains the same as in the barrel, the probability that the sprayed powder will adhere to the inner wall of the shroud and cause clogging will increase.However, by gradually increasing the inner diameter, Such inconvenience can be prevented beforehand.
- the shape of the substrate may be any of various shapes such as a flat plate, a curved plate, a pulp body, and a deformed product.
- stainless steel (SUS316L) powder was sprayed using a high-speed flame spraying apparatus using a combustion flame of kerosene and oxygen as a heat source.
- the barrel length is 10 cm or 20 cm.
- Nitrogen is used as the inert gas, and the combustion conditions (mixing ratio of fuel and oxygen) and the nitrogen gas flow rate in the gas shroud are changed. The porosity and oxygen content therein were measured.
- the gas shroud having the configuration illustrated in FIG. 3 was used.
- the inner diameter of the spray gun barrel outlet side is 2 Omm
- the inner diameter of the shroud outlet side is 30 mm
- the length is 20 Omm.
- the inert gas near the spray gas barrel outlet (1) A 45 ° slope was provided. Such an inclined surface is not provided in the entire circumferential slit for supplying the inert gas (2), and the inert gas is blown and supplied from a direction perpendicular to the central axis of the shroud.
- the nitrogen gas flow rate of the inert gas (2) on the outlet side of the gas shroud was kept constant at 0.45m3_min.
- Table 1 shows the fuel and oxygen supply, combustion pressure, and other thermal spray conditions for the oxidized, medieval, and reducing flames tested.
- Table 2 shows the spray length of the barrel length and shroud gas inert gas (1) flow rate. It is an experimental value of the effect on the average velocity and the melting rate of the particles. This is the result under the condition that the mixture ratio of fuel and oxygen is complete combustion.
- the particle velocity was measured by an optical non-contact method, and the melting ratio was measured by pouring into an agar gel and separating the melted and unmelted portions. (This is described in the Journal of the Japan Institute of Metals, 65 (2001). ) 3 17-22 and is introduced in detail).
- the melting rate of the particles is reduced by the shroud gas because the introduced nitrogen gas has a cooling effect at room temperature.
- Figure 4 shows the measured values of porosity and oxygen content in the sprayed stainless steel film obtained under various conditions.
- the arrows in the figure indicate the changes that occur when using a gas shroud.
- the oxygen content was significantly reduced under the combustion conditions of neutral flame and reducing flame, but the oxidation flame had little effect.
- the porosity increased to more than 2.5%. It was found that the use of an oxidizing flame could not be expected to reduce the shroud oxidation because oxygen remained even if all the fuel was consumed.
- the numbers “1 5” and “25” in the notation “Re l 5”, “Ne l 5” and “No, Re 25” in FIG. 4 indicate the shroud gas flow rates of 1.5 mVm in and 2.5 mVm in, respectively. 3 / min.
- Figure 5 plots the data in Figure 4 with the horizontal axis as the average velocity of the spray particles.
- the modified graph is shown.
- the combination of a 20 cm barrel and a gas shroud resulted in particle velocities in excess of 750 m / s, with low oxygen content (0.3% or less).
- porosity 0 are simultaneously achieved.
- Hastelloy has already obtained a patent even if it is sprayed under standard conditions using a commercially available HVOF spraying equipment: it is possible to obtain a film that is considerably dense and has excellent corrosion resistance (Patent No. 3069696). No. 2, corrosion-resistant sprayed coating and its manufacturing method, May 26, 2012) are as described above.
- the corrosion resistance in this case was determined by immersing it in artificial seawater in a laboratory and evaluating its appearance, potential and corrosion resistance value, and found that no corrosion was observed even after 3 months.
- Figure 6 shows the results of measuring the time-dependent changes in the amount of iron ions eluted.
- Fig. 6 shows the measurement results under the standard condition and the HV condition, as well as the case of the Hastelloy plate itself.
- the standard conditions and HV conditions are shown in Table 3 below. Table 3
- the particle density has increased due to the increase in the particle velocity.
- the level of iron ion elution is not low, and iron ions elute immediately after immersion. This is attributed to the high oxidation of the coating.
- the amount of elution from the film (marked with a dash) obtained by attaching the shroud was almost the same as that of the Hastelloy plate material shown by the dotted line. Little elution of the iron substrate was observed, and the film itself was stable. It indicates that there is.
- Hastelloy C alloy In HVOF spraying of Hastelloy C alloy, a coating with a porosity of 0 has already been obtained under normal spraying conditions in the evaluation using a conventional mercury porosimeter. However, by spraying the alloy with the addition of a gas shroud, no elution of iron ions into the acid aqueous solution was observed, and the coating itself had high corrosion resistance. Obtained.
- the main factor is that the present invention can simultaneously increase the speed of sprayed particles, maintain an inert atmosphere, and suppress overheating of the substrate, resulting in the resulting effect.
- the present invention is applicable to other materials, and a principle based on its useful constituent elements is considered to affect other thermal spraying methods or to be applicable as it is.
- the gas shroud is mounted on the HVOF spraying gun, and the gas shroud internal space is formed so as to suppress oxidation of metal particles sprayed from the spraying gun and to urge the particle velocity.
- a large amount of inert gas is supplied to the substrate so that metal particles collide with the substrate without overheating the substrate so that a dense thermal spray coating with low oxygen content can be formed at a relatively low temperature.
- a dense sprayed metal film can be formed at a low oxygen concentration. It is a breakthrough technology that breaks the barriers of conventional technology.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/515,816 US20050199739A1 (en) | 2002-10-09 | 2003-10-09 | Method of forming metal coating with hvof spray gun and thermal spray apparatus |
EP03754062A EP1550735B1 (en) | 2002-10-09 | 2003-10-09 | Method of forming metal coating with hvof spray gun and thermal spray apparatus |
DE60335394T DE60335394D1 (de) | 2002-10-09 | 2003-10-09 | Verfahren zur herstellung eines metall berzugs mit einer hvof-spritzpistole und vorrichtung zum thermischen spritzen |
US12/796,981 US20100304036A1 (en) | 2002-10-09 | 2010-06-09 | Metallic film forming method using hvof thermal spraying gun and thermal spraying apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002296709A JP3612568B2 (ja) | 2001-10-09 | 2002-10-09 | Hvof溶射ガンによる金属皮膜形成方法と溶射装置 |
JP2002-296709 | 2002-10-09 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/796,981 Continuation US20100304036A1 (en) | 2002-10-09 | 2010-06-09 | Metallic film forming method using hvof thermal spraying gun and thermal spraying apparatus |
Publications (1)
Publication Number | Publication Date |
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WO2004033747A1 true WO2004033747A1 (ja) | 2004-04-22 |
Family
ID=32089244
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2003/012983 WO2004033747A1 (ja) | 2002-10-09 | 2003-10-09 | Hvof溶射ガンによる金属皮膜形成方法と溶射装置 |
Country Status (4)
Country | Link |
---|---|
US (2) | US20050199739A1 (ja) |
EP (1) | EP1550735B1 (ja) |
DE (1) | DE60335394D1 (ja) |
WO (1) | WO2004033747A1 (ja) |
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CA2527764C (en) * | 2005-02-11 | 2014-03-25 | Suelzer Metco Ag | An apparatus for thermal spraying |
DE102006050059A1 (de) * | 2006-10-24 | 2008-04-30 | Linde Ag | Düse zur industriellen Bearbeitung |
US20080145688A1 (en) | 2006-12-13 | 2008-06-19 | H.C. Starck Inc. | Method of joining tantalum clade steel structures |
US8197894B2 (en) | 2007-05-04 | 2012-06-12 | H.C. Starck Gmbh | Methods of forming sputtering targets |
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US8575059B1 (en) | 2007-10-15 | 2013-11-05 | SDCmaterials, Inc. | Method and system for forming plug and play metal compound catalysts |
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US8246903B2 (en) | 2008-09-09 | 2012-08-21 | H.C. Starck Inc. | Dynamic dehydriding of refractory metal powders |
WO2010118186A2 (en) | 2009-04-07 | 2010-10-14 | Frank's International, Inc. | Friction reducing wear band and method of coupling a wear band to a tubular |
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US8669202B2 (en) | 2011-02-23 | 2014-03-11 | SDCmaterials, Inc. | Wet chemical and plasma methods of forming stable PtPd catalysts |
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US8734896B2 (en) | 2011-09-29 | 2014-05-27 | H.C. Starck Inc. | Methods of manufacturing high-strength large-area sputtering targets |
CN104040015B (zh) * | 2012-01-13 | 2016-10-19 | 株式会社中山非晶质 | 非晶形薄膜的形成装置 |
US9156025B2 (en) | 2012-11-21 | 2015-10-13 | SDCmaterials, Inc. | Three-way catalytic converter using nanoparticles |
US9511352B2 (en) | 2012-11-21 | 2016-12-06 | SDCmaterials, Inc. | Three-way catalytic converter using nanoparticles |
IN2013DE01501A (ja) * | 2013-05-20 | 2015-09-11 | Metallizing Equipment Company Pvt Ltd | |
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EP3039168B1 (en) | 2013-08-28 | 2018-10-24 | Antelope Oil Tool & Mfg. Co., LLC | Chromium-free thermal spray composition, method, and apparatus |
EP3068517A4 (en) | 2013-10-22 | 2017-07-05 | SDCMaterials, Inc. | Compositions of lean nox trap |
CA2926133A1 (en) | 2013-10-22 | 2015-04-30 | SDCmaterials, Inc. | Catalyst design for heavy-duty diesel combustion engines |
EP3119500A4 (en) | 2014-03-21 | 2017-12-13 | SDC Materials, Inc. | Compositions for passive nox adsorption (pna) systems |
CN105803380B (zh) * | 2016-04-28 | 2018-02-06 | 中国人民解放军装甲兵工程学院 | 低氧含量高铝青铜涂层的制备方法 |
EP3509762B1 (en) | 2016-09-07 | 2022-11-02 | Alan W. Burgess | High velocity spray torch for spraying internal surfaces |
KR102649715B1 (ko) * | 2020-10-30 | 2024-03-21 | 세메스 주식회사 | 표면 처리 장치 및 표면 처리 방법 |
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2003
- 2003-10-09 DE DE60335394T patent/DE60335394D1/de not_active Expired - Lifetime
- 2003-10-09 US US10/515,816 patent/US20050199739A1/en not_active Abandoned
- 2003-10-09 EP EP03754062A patent/EP1550735B1/en not_active Expired - Fee Related
- 2003-10-09 WO PCT/JP2003/012983 patent/WO2004033747A1/ja active Application Filing
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See also references of EP1550735A4 |
Also Published As
Publication number | Publication date |
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US20100304036A1 (en) | 2010-12-02 |
EP1550735A4 (en) | 2008-09-10 |
EP1550735B1 (en) | 2010-12-15 |
EP1550735A1 (en) | 2005-07-06 |
US20050199739A1 (en) | 2005-09-15 |
DE60335394D1 (de) | 2011-01-27 |
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