WO1997045566A1 - Procede pour renforcer un revetement pulverise - Google Patents

Procede pour renforcer un revetement pulverise Download PDF

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Publication number
WO1997045566A1
WO1997045566A1 PCT/JP1996/001383 JP9601383W WO9745566A1 WO 1997045566 A1 WO1997045566 A1 WO 1997045566A1 JP 9601383 W JP9601383 W JP 9601383W WO 9745566 A1 WO9745566 A1 WO 9745566A1
Authority
WO
WIPO (PCT)
Prior art keywords
coating
sealing
sprayed
thermal spray
strengthening
Prior art date
Application number
PCT/JP1996/001383
Other languages
English (en)
Japanese (ja)
Inventor
Takao Sato
Atsushi Migita
Kiyohiro Tarumi
Original Assignee
Nippon Steel Hardfacing Co., Ltd.
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 Nippon Steel Hardfacing Co., Ltd. filed Critical Nippon Steel Hardfacing Co., Ltd.
Priority to EP96914423A priority Critical patent/EP0853135A4/fr
Priority to KR1019980700539A priority patent/KR19990035878A/ko
Priority to AU57792/96A priority patent/AU5779296A/en
Priority to PCT/JP1996/001383 priority patent/WO1997045566A1/fr
Publication of WO1997045566A1 publication Critical patent/WO1997045566A1/fr

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
    • C23C4/18—After-treatment

Definitions

  • the present invention relates to a method for strengthening a thermal spray coating to be formed in order to extend the life of a structural member by performing metal, cermet or ceramic spraying for imparting wear resistance, corrosion resistance, heat resistance, etc.
  • a thermal spray coating to be formed in order to extend the life of a structural member by performing metal, cermet or ceramic spraying for imparting wear resistance, corrosion resistance, heat resistance, etc.
  • a metal, cermet or ceramic spray to form a thermal spray coating is applied to various industrial structural members.
  • the sealing process is performed after completing the thermal spray coating of the target thickness.
  • the penetration of the sealing agent into the coating is 2 to 5 ⁇ m from the surface of the high-density coating, and at most 20 ⁇ m even with a highly permeable coating. was only formed, and only incomplete sealing was performed at a depth of 5 ⁇ or more.
  • the present invention solves the above-mentioned conventional problems, and enhances and strengthens the denseness of a dense sprayed coating by sealing the inside of the sprayed coating, and also provides a method of strengthening a sprayed coating excellent in peel resistance. It is intended to provide.
  • the formed thermal spray coating in the thermal spray coating forming step of not more than the final thickness, is subjected to sealing treatment with a sealing agent, and the sealing agent is completely
  • the method aims to strengthen the thermal spray coating by densifying the sealing inside the coating, characterized by continuing to form the thermal spray coating after drying to a solid material.
  • the invention is also directed to a method of strengthening the sprayed coating by densifying the inside of the coating by alternately repeating a plurality of times, or performing one or both of heating and brushing after the sealing treatment.
  • the present invention also provides a method of strengthening the thermal spray coating by sealing and densifying the inside of the coating by sealing the top finish thermal spray layer.
  • the thermal spray coating contains Cr 2 ⁇ . 3 , S i 0 2 , A l. 0 o, Z r 0 o, C r B 0, WB, M o 2 B, S i C, T i C, VC, C r 7 C 3, either N b C, or two or more coexisting or
  • the present invention also includes the use of a sealing agent that forms a mixture, the formation of a sprayed coating having a different sprayed coating material before and after the sealing treatment, and the sealing treatment in a high-temperature, high-pressure container. It is included in the abstract.
  • a sealing agent or metal alkoxide alcohol which forms oxides, borides, carbides, or coexistence or a mixture thereof in the sprayed coating.
  • Seal with a sealing agent such as a liquid, and dry thoroughly. Further, if necessary, the surface of the sealing treatment is heated to 100 ° C. or more to form a solid sealing material.
  • a process of forming a homogeneous or heterogeneous thermal spray coating is performed again. Before spraying, it is effective to lightly brush the surface to remove unnecessary solids. Further, the sealing agent may be converted into a stable compound by heat treatment. In this way, after the sealing process, By performing the thermal spraying, it is possible to densify the sealing to a deep portion of the thermal spray coating.
  • the sealing treatment of the thick sprayed coating can be sufficiently performed over the entire thickness of the coating. Further, the thickness of the sealing treatment can be arbitrarily set according to the purpose of use.
  • the disadvantages of the conventional thermal spray coating for sealing treatment that is, the point that the thickness of the sealing coating layer is small, are eliminated, and the service life of the structural member on which the thermal spray coating is formed is promised to be dramatically improved. Is done.
  • the concentration and type of the sealing agent used in the present invention are determined according to the application of the sprayed coating, and the sealing treatment time is determined by the relationship with the thickness of the sprayed coating.
  • a chromic acid-based sealing agent or a sealing agent such as a metal alkoxide alcohol solution is used.
  • the sealing agent is mainly composed of a sealing component having high heat resistance, abrasion resistance, and high adhesion to a thermal spray coating. If so, the composition of the sealing material is not limited to an oxide type, and any of a boride type, a carbide type, and a mixture type thereof can be used.
  • a cermet or ceramic-based coating with a relatively high porosity is more effective, but it is applied to a metal-based thermal spray coating to form a cermet. It can also be used as a means to do.
  • a cermet film can be formed by dispersing the solid produced by the sealing agent in the metal layer.
  • a heat treatment as a final treatment, it is possible to further enhance the densification of the sprayed coating.
  • Example 1 The present invention will be specifically described with reference to an example in which the present invention is mainly applied to the manufacture of a structural member mainly used in a steel production line, but the present invention is not limited thereto.
  • Example 1
  • the treatment of the roll in the bath for hot-dip galvanizing was carried out. Cermet or ceramic spraying was applied to the roll surface in a hot dip galvanizing bath for thin steel sheets.
  • a boride-WC-WC cermet with a coating thickness of 70 / m Performs gas spraying, alone or both followed chromic acid solution formed film by (C r 2 0 3 concentration 3 0) or S i alkoxide alcohol sealing agent is applied and dried ten minutes, 2 boride path - was carried out alone or both WC-based mono- message Bok spraying or C r 2 0 3 system ceramic box sprayed (thickness about 2 0 m). Further, the chromic acid-based solution or the Si alkoxide alcohol-based sealing agent alone or both were applied thereon, and fired at 400.
  • the depth of the sealing layer reached 40 jum, and a sealing layer having a thickness more than twice that of the conventional example in which sealing was performed only as a final finish was obtained.
  • the life limit life is 50 days when the chromic acid-based solution or the Si alkoxide alcohol-based sealing agent is used alone, and 60 days when both are applied. It was the limit life.
  • the service life limit of the roll in the hot-dip galvanizing bath was further extended to reach 50 days or more.
  • the invention has been applied to the production of hearth rolls.
  • MC r A 1 Y cermet spraying rolls are mainly used for continuous annealing furnaces and continuous zinc It is used as hearth roll for annealing furnace of plating line.
  • the surface chromic acid solution after the sprayed skin layer forming roll (C r 2 0 3 concentration of 3 0%) which was subjected to the sealing treatment with, it is known to have excellent resistance to build-up property. When the surface wears down, the build-up resistance slightly deteriorates in about two years, depending on the production volume.
  • the spraying is stopped except for the last one pass, and the surface is sealed with the chromic acid-based solution used in Example 1.
  • the final pass was sprayed with a thickness of 15 // m thick, and after that, the solution was sealed with the above solution, and then fired in a furnace at 400 ° C. .
  • the thickness of the sealing layer increased, and at the same time, the density of the sprayed coating increased, so that even if the surface was slightly worn, the build-up resistance did not decrease.
  • the present invention has been applied to the production of brush-up 'bridle rolls used in acidic solutions.
  • the Si alkoxide-based alcohol-based sealing is performed except for the last two passes (30 zm). Sealing treatment was carried out with a pore agent, and the surface was baked at 200 ° C., subjected to two-pass spraying, and further sealed with the same sealing agent. As a result, the service life was improved to 3 to 5 years.
  • the present invention has been applied to the manufacture of bistrod rods for internal combustion engines.
  • the sliding part of the metal is sprayed with chromium oxide ceramics.
  • the present invention is applied, and the sliding part of the piston rod is first sprayed with ceramics only half of the total thickness of the sprayed coating (30 ⁇ m), and then the chromic acid solution
  • the present invention has been applied to the production of a continuous molding mold.
  • continuous molding molds are subjected to Ni-Cr-based self-fluxing alloy spraying after a base treatment with Ni for the purpose of improving wear resistance and heat crack resistance.
  • the present invention is applied, and after the Ni mold undercoat treatment is performed on the surface of the forged mold, the final two passes (50 ⁇ m) are performed for Ni—Cr system self-fluxing alloy or cermet spraying. leaving applying a chromic acid solution (C r n 0 3 concentration of 30%) was sufficiently dried and subjected to two-pass spraying. Further, the solution was applied thereon, and a heat treatment at 400 ° C. was performed as a final treatment.
  • the present invention has been applied to the manufacture of a table opening roller at a hot rolling mill.
  • Table rollers at the hot rolling mill require abrasion resistance, seizure resistance and slip resistance, but in the past, self-fluxing alloy spraying was applied to high Cr-iron-based manufacturing rolls.
  • the present invention when the present invention is applied and NiCr—WC-based self-fluxing alloy or cermet spraying is performed on the material roll, the chromic acid-based solution ( (Cr 20 3 concentration: 30%) was applied and dried sufficiently, and then two-pass thermal spraying was performed. Further, the above solution is applied thereon, and a heat treatment at 400 ° C is performed as a final treatment. did.
  • the table roller obtained as a result has more than 20 times the wear resistance of the conventional high Cr-iron-based rolls, and can be used only with Ni Cr-WC-type cermet spraying. It was confirmed in actual operation that the sprayed layer did not peel even when used in a corrosive environment where cooling water could not be used.
  • the invention has been applied to the production of corrosive environmental liners.
  • wear-resistant liners used in corrosive environments of water and seawater have used high-Cr-iron-based spray liners, thermostats or self-fluxing alloy sprayed liners.
  • the liner had abrasion resistance and chipping, and the thermal spray liner had a problem of corrosion due to long-term use.
  • the present invention is applied to a material liner, N i C r- WC system
  • Sami Tsu preparative sprayed upon final two passes (2 0 rn) leaving chromic acid solution (C R.0 3 concentration 3 0 %) was applied and dried sufficiently, and two-pass spraying was performed. Further, the solution was applied thereon, and a heat treatment at 400 ° C. was performed as a final treatment.
  • the present invention has been applied to the production of papermaking rolls in a paper mill.
  • thermal spraying of WC cermet is performed on the surface of the material roll.
  • a sulfuric acid-based corrosive solution it is necessary to perform a sealing treatment for imparting corrosion resistance.
  • a cermet spray is applied only for half of the total thickness (100 im) of the sprayed coating, and a chromic acid-based solution (Cr.0; (0%) after coating, baking the surface at 200 ° C, spraying the other half, sealing with the above solution, and then heating in a furnace at a temperature of 400 ° C. C was completely baked.
  • the present invention is configured as described above, the abrasion resistance, corrosion resistance, heat resistance, etc. are improved as compared with the conventional sprayed coating subjected to a conventional sealing treatment, and the life of the structural member is extended. This is extremely useful industrially because of the excellent effect that it can be performed.

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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)
  • Coating By Spraying Or Casting (AREA)

Abstract

L'invention concerne un procédé pour renforcer des revêtements pulvérisés par densification des pores qui y sont présents. Ce procédé consiste à sceller les pores avec un matériau d'étanchéité lors de l'étape de formation d'un revêtement pulvérisé plus fin que le revêtement final, à sécher le matériau d'étanchéité suffisamment pour permettre sa solidification, à continuer la formation d'un revêtement pulvérisé, et à répéter, si nécessaire, les modes opératoires précités. Par suite, le revêtement pulvérisé est amélioré au niveau de la résistance à l'abrasion, à la corrosion, à la chaleur, etc., et la longévité des éléments structuraux ainsi revêtus est accrue.
PCT/JP1996/001383 1996-05-24 1996-05-24 Procede pour renforcer un revetement pulverise WO1997045566A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP96914423A EP0853135A4 (fr) 1996-05-24 1996-05-24 Procede pour renforcer un revetement pulverise
KR1019980700539A KR19990035878A (ko) 1996-05-24 1996-05-24 용사피막의 강화방법
AU57792/96A AU5779296A (en) 1996-05-24 1996-05-24 Method of strengthening sprayed coating
PCT/JP1996/001383 WO1997045566A1 (fr) 1996-05-24 1996-05-24 Procede pour renforcer un revetement pulverise

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1996/001383 WO1997045566A1 (fr) 1996-05-24 1996-05-24 Procede pour renforcer un revetement pulverise

Publications (1)

Publication Number Publication Date
WO1997045566A1 true WO1997045566A1 (fr) 1997-12-04

Family

ID=14153325

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1996/001383 WO1997045566A1 (fr) 1996-05-24 1996-05-24 Procede pour renforcer un revetement pulverise

Country Status (4)

Country Link
EP (1) EP0853135A4 (fr)
KR (1) KR19990035878A (fr)
AU (1) AU5779296A (fr)
WO (1) WO1997045566A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103243290B (zh) * 2013-05-20 2014-12-03 河北工程大学 一种高抗腐电弧喷涂纯铝涂层封孔剂与制备工艺及其应用
CN104419889A (zh) * 2013-09-04 2015-03-18 天津大学 一种采用纳米三氧化二铝进行热喷涂涂层封孔的方法和应用

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5690969A (en) * 1979-12-24 1981-07-23 Nippon Tungsten Co Ltd Method of making melt-sprayed film dense
JPS5770275A (en) * 1980-10-20 1982-04-30 Mitsubishi Heavy Ind Ltd Pore sealing treatment of ceramic sputtered film
JPS59145776A (ja) * 1983-02-07 1984-08-21 Hitachi Zosen Corp 鉄鋼構造物の防食防汚方法
JPS61235551A (ja) * 1985-04-11 1986-10-20 Kobe Steel Ltd 海洋構造部材の表面被覆方法
JPH036458U (fr) * 1989-05-31 1991-01-22
JPH07268594A (ja) * 1994-02-10 1995-10-17 Sumitomo Metal Ind Ltd 溶融金属めっき浴浸漬部材とその製造方法
JPH08158034A (ja) * 1994-12-01 1996-06-18 Nittetsu Hard Kk 溶射皮膜の強化方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59205480A (ja) * 1983-05-09 1984-11-21 Usui Internatl Ind Co Ltd 断熱エンジン部品用セラミツク溶射被覆層の強化法
DE59504660D1 (de) * 1994-04-14 1999-02-11 Grillo Werke Ag Verfahren zur Verbesserung der Haftfestigkeit von thermischen Spritzschichten aus Metallen, Metalloxiden und Hartstoffen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5690969A (en) * 1979-12-24 1981-07-23 Nippon Tungsten Co Ltd Method of making melt-sprayed film dense
JPS5770275A (en) * 1980-10-20 1982-04-30 Mitsubishi Heavy Ind Ltd Pore sealing treatment of ceramic sputtered film
JPS59145776A (ja) * 1983-02-07 1984-08-21 Hitachi Zosen Corp 鉄鋼構造物の防食防汚方法
JPS61235551A (ja) * 1985-04-11 1986-10-20 Kobe Steel Ltd 海洋構造部材の表面被覆方法
JPH036458U (fr) * 1989-05-31 1991-01-22
JPH07268594A (ja) * 1994-02-10 1995-10-17 Sumitomo Metal Ind Ltd 溶融金属めっき浴浸漬部材とその製造方法
JPH08158034A (ja) * 1994-12-01 1996-06-18 Nittetsu Hard Kk 溶射皮膜の強化方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0853135A4 *

Also Published As

Publication number Publication date
EP0853135A1 (fr) 1998-07-15
KR19990035878A (ko) 1999-05-25
AU5779296A (en) 1998-01-05
EP0853135A4 (fr) 2000-10-25

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