WO1997043082A1 - Alliages de brasage a base de nickel-chrome - Google Patents

Alliages de brasage a base de nickel-chrome Download PDF

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Publication number
WO1997043082A1
WO1997043082A1 PCT/US1997/008097 US9708097W WO9743082A1 WO 1997043082 A1 WO1997043082 A1 WO 1997043082A1 US 9708097 W US9708097 W US 9708097W WO 9743082 A1 WO9743082 A1 WO 9743082A1
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WO
WIPO (PCT)
Prior art keywords
atom percent
ranges
brazing
homogeneous
nickel
Prior art date
Application number
PCT/US1997/008097
Other languages
English (en)
Inventor
Anatol Rabinkin
Original Assignee
Alliedsignal Inc.
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 Alliedsignal Inc. filed Critical Alliedsignal Inc.
Publication of WO1997043082A1 publication Critical patent/WO1997043082A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3033—Ni as the principal constituent
    • B23K35/304—Ni as the principal constituent with Cr as the next major constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
    • B23K35/0233—Sheets, foils

Definitions

  • This invention relates to brazing filler metals composed of nickel-
  • chromium-based alloys containing transition metals such as iron and molybdenum and certain metalloids and more particularly to multicomponent alloys containing
  • nickel, chromium, iron, molybdenum, boron, and silicon which are particularly
  • Brazing is a process for joining metal parts, often of dissimilar composition.
  • brazing filler metal that has a melting point lower than
  • the plate-and-frame heat exchangers have been widely used in food. chemical, aerospace and other process industries
  • a standard plate-and-frame heat exchanger consists of a number of alternating corrugated/flat metal sheets kept in
  • brazed heat exchangers are stronger and more suitable for high temperature/high
  • ammonia and, at the same time, some other even more potent than ammonia
  • filler metals are the best potential choice for such an application Moreover, of particular importance for heat exchanger performance is the ability of their brazed
  • heat exchanger brazes should be free from any brittle phases in order to provide high ductility and strength combined with high corrosion resistance
  • brazing is typically carried out with a holding time at brazing temperature of about 15-30 min Such holding time is insufficient to deplete the braze of silicon and boron by
  • Brazing filler metals consisting of nickel-chromium-based alloys
  • the alloy species disclosed in US Pat Nos 4, 148 973, 4,302,515 and 4,745,037 contain boron in substantial amount(s) (at least
  • honeycomb structures employed in airfoils and plate-type heat exchangers subjected to variable high pressure/high temperature conditions Moreover, this is
  • nickel, palladium, and iron decreases amorphability of alloys containing transition elements and metalloids such as boron and silicon
  • brazing foil retains ductility, causes joints produced from this ribbon to
  • This improved corrosion resistance is of specific importance in heat exchanger applications in which water is used as a cooling medium or when water is used as a cooling medium or when water is
  • brazing products to be employed in high temperature, high stress and high fatigue
  • brazements which exhibit optimal microstructure and thickness, and which retain
  • brazements exhibit high corrosion resistance in various corrosive environments
  • Brazing alloys particularly suited for use as the filler metal consist essentially of ruckel-chromium-based alloys having a composition defined by the following
  • the invention provides brazing filler metals in the form of
  • homogeneous ductile foils which are composed of metastable materials preferably having at least 80% amorphous structure.
  • FIG 1 is an optical micrograph of an AISI 316 stainless steel joint made using a filler metal of the present invention, the micrograph depicting a
  • the brazing material In any brazing process, the brazing material must have a melting point that will be sufficiently high to provide strength to meet service requirements of the
  • the brazing material must be more noble than the base metal being brazed to avoid corrosion Ideally, the brazing material should be in 100% metal containing foil
  • brazing foils should be
  • chromium-based alloys which exhibit a liquidus of at least about 1090 degree(s) C, and are particularly suitable for brazing stainless steel and superalloys
  • the brazing filler metals have a composition consisting essentially of 0 to about 5 atom percent iron, about 9 5 to about 16 5 atom percent chromium, about 10 to
  • brazements produced with filler metal composed of these alloys are advantageousously, brazements produced with filler metal composed of these alloys
  • chromium concentration of the filler metal is higher than 10 wt.%, a well known threshold
  • the amount of chromium present in the alloy ranges from about 9.5 to about 16.5 atom percent, and more preferably from about
  • Iron when present in the amount of 0 to about 5, and more preferably about 1 to about 4 atom percent, improves compatibility of the filler metal with the base metal. Boron and silicon are added to enhance the
  • boron is present in the amount of about 6 to less than 7,
  • the silicon content ranges from about 10 to about 15, and more preferably from about 1 1.0 to about 13 5 atom percent In these amounts silicon operates to induce formation of the amorphous structure and contributes to brazeability of the filler metal
  • content of the filler metal ranges from about 16 to about 22 atom percent, and more preferably ranges from 18 to about 20 atom percent.
  • molybdenum is also present in an amount ranging from 0 to
  • invention is to preserve the low melting temperature of the alloy while increasing
  • molybdenum greatly reduces the incidence of pitting of brazed joints which may be
  • Nickel also imparts
  • the alloys of the present invention can be produced in various forms, such as
  • the alloys exhibit low erosion of base metal and no significant diffusion problems, generally
  • alloys of the present invention do not substantially
  • the alloys of the present invention are ordinarily produced in the form of
  • composition using rapid solidification techniques More specifically, the homogeneous brazing filler metals of the present invention are fab ⁇ cated by a rapid
  • the metastable material may be amorphous, in which case there is no
  • the microstructure of alloys of the present invention contained at least 80% of amorphous phase to achieve superior ductility, and most preferably it is at least about 90% amorphous.
  • Foils produced by the rapid solidification process described herein are between about 65 and about 100 micrometers thick, preferably between about 68
  • brazements produce therefrom are quite uniform and substantially free of voids
  • the alloys within this most preferred embodiment exhibit a
  • melting temperature range of between about 960 degree(s) C and about 1200 degree(s) C and, most preferably, range from about 1030 degree(s) C to about 1 130 degree(s) C
  • the specific advantages of these alloys include the ability to braze at reasonably high temperatures and to provide a brazement which can be
  • brazing process of the invention provides a marked
  • brazing temperature of at least 50°C higher than liquidus
  • Ribbons about 2 54 to about 200 mm (about 0 1 to about 8 inches) wide and about 68 to about 76 micrometers (about 0 0026 to about 0 003 inch) thick are - -
  • DTA Differential Thermal Analysis
  • the tensile specimens are dimensioned and fabricated as lap shear
  • Braze joints are of the lap type, with the lap dimensions carefully controlled to 0 3175 cm (0 125 inch)
  • Brazing specimens are degreased with benzene Lap joints containing brazing
  • ribbons of the invention are assembled with the ribbons side by side, the length of the lap joint
  • the ribbons act as spacers A single spot
  • weld is used to hold the assembly together, as is a common industrial practice
  • brazing alloy of the invention an amorphous ductile ribbon of nominal composition
  • brazing conditions are outlined in Table 3 The brazing conditions are outlined in Table 3 The
  • Fig 1 The j oint depicted by Fig 1 is an AISI 3 16L stainless steel joint having a width of about 70
  • the joint itself is uniform and has a strong and ductile single phase
  • brazed tensile testing specimens are subjected to tensile testing after

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

Alliage de brasage à base de nickel-chrome composé essentiellement d'environ 9,5 à environ 16,5 % en pourcentage atomique de chrome, de 0 à environ 5 % de fer, d'environ 10 à environ 15 % en pourcentage atomique de silicium, d'environ 6 à environ moins de 7 % en pourcentage atomique de bore et de 0 à environ 5 % en pourcentage atomique de molybdène, le solde étant essentiellement constitué de nickel et d'impuretés accidentelles. Ledit alliage convient particulièrement en tant que métal d'apport pour brasage pour joindre de l'acier inoxydable et/ou des superalliages à des températures supérieures à 1100 °C. Un tel métal d'apport possède une épaisseur allant d'environ 65 à 100 micromètres et une largeur allant de 100 à 200 millimètres et plus. Des structures en nids d'abeilles et des structures minces ondulées en forme de nageoire ou de plaque particulièrement adaptées pour être utilisées dans la fabrication d'échangeurs de chaleur de type plaque formés au moins en partie d'aciers inoxydables et/ou de superalliages sont brasées à l'aide d'un procédé unique en son genre. Ledit procédé est caractérisé par une longue durée de maintien à une température de brasage et combine le brasage et le recuit de diffusion en une seule étape technologique. Les brasures produites par ledit procédé présentent une disparition complète de la ligne d'eutexie centrale et des composés intermétalliques cassants de la microstructure de joint. Les brasures présentent en outre une ductilité de brasure, ainsi qu'une excellente solidité et une résistance élevée à la fatigue et à la corrosion.
PCT/US1997/008097 1996-05-14 1997-05-13 Alliages de brasage a base de nickel-chrome WO1997043082A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US64598696A 1996-05-14 1996-05-14
US08/645,986 1996-05-14

Publications (1)

Publication Number Publication Date
WO1997043082A1 true WO1997043082A1 (fr) 1997-11-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/008097 WO1997043082A1 (fr) 1996-05-14 1997-05-13 Alliages de brasage a base de nickel-chrome

Country Status (1)

Country Link
WO (1) WO1997043082A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1108796A1 (fr) * 1999-12-17 2001-06-20 Edison Termoelettrica S.p.A. Alliage à base nickel contenant du chrome, bore et silicium, articles à base de cet alliage et leur procédé de production
US7201973B2 (en) 2003-12-10 2007-04-10 Honeywell International, Inc. Bimetallic plate-fin titanium based heat exchanger
US10180292B2 (en) 2013-09-26 2019-01-15 Alfa Laval Corporate Ab Plate heat exchanger
US10576587B2 (en) 2013-09-26 2020-03-03 Alfa Laval Corporate Ab Brazing concept

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2714760A (en) * 1951-07-02 1955-08-09 Curtiss Wright Corp Method of brazing and joint produced thereby
US4148973A (en) * 1976-12-15 1979-04-10 Allied Chemical Corporation Homogeneous, ductile brazing foils
EP0051461A1 (fr) * 1980-10-30 1982-05-12 Allied Corporation Feuilles de brasage ductiles homogènes
EP0108959A1 (fr) * 1982-11-15 1984-05-23 Allied Corporation Métal d'apport pour le brasage fort à base de nickel avec une teneur élevée en chrome pour l'application à haute température
US4745037A (en) * 1976-12-15 1988-05-17 Allied Corporation Homogeneous, ductile brazing foils
WO1996037335A1 (fr) * 1995-05-22 1996-11-28 Alliedsignal Inc. Alliages de brasage a base de nickel et de chrome

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2714760A (en) * 1951-07-02 1955-08-09 Curtiss Wright Corp Method of brazing and joint produced thereby
US4148973A (en) * 1976-12-15 1979-04-10 Allied Chemical Corporation Homogeneous, ductile brazing foils
US4745037A (en) * 1976-12-15 1988-05-17 Allied Corporation Homogeneous, ductile brazing foils
EP0051461A1 (fr) * 1980-10-30 1982-05-12 Allied Corporation Feuilles de brasage ductiles homogènes
EP0108959A1 (fr) * 1982-11-15 1984-05-23 Allied Corporation Métal d'apport pour le brasage fort à base de nickel avec une teneur élevée en chrome pour l'application à haute température
WO1996037335A1 (fr) * 1995-05-22 1996-11-28 Alliedsignal Inc. Alliages de brasage a base de nickel et de chrome

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1108796A1 (fr) * 1999-12-17 2001-06-20 Edison Termoelettrica S.p.A. Alliage à base nickel contenant du chrome, bore et silicium, articles à base de cet alliage et leur procédé de production
US6461744B1 (en) 1999-12-17 2002-10-08 Edison Termoelettrica S.P.A. Article based on a metal alloy of nickel, chromium and metalloid elements including microcrystalline precipitates, metal alloy and preparation method
US7201973B2 (en) 2003-12-10 2007-04-10 Honeywell International, Inc. Bimetallic plate-fin titanium based heat exchanger
US10180292B2 (en) 2013-09-26 2019-01-15 Alfa Laval Corporate Ab Plate heat exchanger
US10323890B2 (en) 2013-09-26 2019-06-18 Alfa Laval Corporate Ab Method for joining metal parts
US10576587B2 (en) 2013-09-26 2020-03-03 Alfa Laval Corporate Ab Brazing concept

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