WO2004001100A1 - Process for electroplating metallic and metall matrix composite foils, coatings and microcomponents - Google Patents
Process for electroplating metallic and metall matrix composite foils, coatings and microcomponents Download PDFInfo
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- WO2004001100A1 WO2004001100A1 PCT/EP2002/007023 EP0207023W WO2004001100A1 WO 2004001100 A1 WO2004001100 A1 WO 2004001100A1 EP 0207023 W EP0207023 W EP 0207023W WO 2004001100 A1 WO2004001100 A1 WO 2004001100A1
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D1/00—Electroforming
- C25D1/04—Wires; Strips; Foils
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D15/00—Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D15/00—Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires
- C25D15/02—Combined electrolytic and electrophoretic processes with charged materials
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/02—Electroplating of selected surface areas
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/04—Electroplating with moving electrodes
- C25D5/06—Brush or pad plating
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/08—Electroplating with moving electrolyte e.g. jet electroplating
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/18—Electroplating using modulated, pulsed or reversing current
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/20—Electroplating using ultrasonics, vibrations
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/60—Electroplating characterised by the structure or texture of the layers
- C25D5/615—Microstructure of the layers, e.g. mixed structure
- C25D5/617—Crystalline layers
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/67—Electroplating to repair workpiece
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/04—Tubes; Rings; Hollow bodies
Definitions
- the invention relates to a process for forming coatings of pure metals, metal alloys or metal matrix composites on a work piece which is electrically conductive or contains an electrically conductive surface layer or forming free-standing deposits of nano-crystalline metals, metal alloys or metal matrix composites by em- ploying pulse electrodeposition.
- the process employs a drum plating process for the continuous production of nanocrystalline foils of pure metals, metal alloys or metal matrix composites or a selective plating (brush plating) process, the processes involving pulse electrodeposition and a non-stationary anode or cathode. Novel nano-crystalline metal matrix composites are disclosed as well.
- the inven- tion also relates to a pulse plating process for the fabrication or coating of micro- components.
- the invention also relates to micro-components with grain sizes below l,000nm.
- the novel process can be applied to establish wear resistant coatings and foils of pure metals or alloys of metals selected from the group of Ag, Au, Cu, Co, Cr, Ni, Fe, Pb, Pd, Pt, Rh, Ru, Sn, V, W and Zn and alloying elements selected from C, P, S and Si and metal matrix composites of pure metals or alloys with particulate additives such as metal powders, metal alloy powders and metal oxide powders of Al, Co, Cu, In, Mg, Ni, Si, Sn, V, and Zn; nitrides of Al, B and Si; C (graphite or diamond); carbides of B, Cr, Bi, Si, W; and organic materials such as PTFE and polymer spheres.
- the selective plating process is particularly suited for in-situ or field applications such as the repair or the refurbishment of dies and moulds, turbine plates, steam generator tubes, core reactor head penetrations of nuclear power plants and the like.
- the continuous plating process is particularly suited for pro- ducing nanocrystalline foils e.g. for magnetic applications.
- the process can be applied to high strength, equiaxed micro-components for use in electronic, bio- medical, telecommunication, automotive, space and consumer applications.
- Nanocrystalline materials also referred to as ultra-fine grained materials, nano- phase materials or nanometer-sized materials exhibiting average grains sizes smaller or equal to lOOnm, are known to be synthesized by a number of methods including sputtering, laser ablation, inert gas condensation, high energy ball milling, sol-gel deposition and electrodeposition. Electrodeposition offers the capability to prepare a large number of fully dense metal and metal alloy compositions at high production rates and low capital investment requirements in a single synthesis step.
- the prior art primarily describes the use of pulse electrodeposition for producing nanocrystalline materials.
- Mori in US 5,496,463 (1996) describes a process and apparatus for composite electroplating a metallic material containing SiC, BN, Si 3 N , WC, TiC, TiO 2 , Al O 3 , ZnB 3 , diamond, CrC, MoS 2 , coloring materials, polytetrafluoroethylene (PTFE) and microcapsules.
- the solid particles are introduced in fine form into the electrolyte.
- Adler in US 4,240,894 (1980) describes a drum plater for electrodeposited Cu foil production.
- Cu is plated onto a rotating metal drum that is partially submersed and rotated in a Cu plating solution.
- the Cu foil is stripped from the drum surface emerging from the electrolyte, which is clad with electroformed Cu.
- the rotation speed of the drum and the current density are used to adjust the desired thickness of the Cu foil.
- the Cu foil stripped from the drum surface is subsequently washed and dried and wound into a suitable coil.
- Icxi in US 2,961,395 (1960) discloses a process for electroplating an article without the necessity to immerse the surface being treated into a plating tank.
- the hand-manipulated applicator serves as anode and applies chemical solutions to the metal surface of the work piece to be plated.
- the work piece to be plated serves as cathode.
- the hand applicator anode with the wick containing the electrolyte and the work piece cathode are connected to a DC power source to generate a metal coating on the work piece by passing a DC current.
- Micromechanical systems are machines constructed of small moving and stationary parts having overall dimensions ranging from 1 to l,000 ⁇ m e.g. for use in electronic, biomedical, telecommunication, automotive, space and consumer technologies.
- Such components are made e.g. by photo-electroforming, which is an additive process in which powders are deposited in layers to build the desired structure e.g. by laser enhanced electroless plating.
- photo-electroforming is an additive process in which powders are deposited in layers to build the desired structure e.g. by laser enhanced electroless plating.
- Lithography, electroforming and molding (LIGA) and other photolithography related processes are used to overcome aspect ratio (parts height to width) related problems.
- Other techniques employed include silicon micromachining, through mask plating and microcontact printing.
- the present invention provides a pulse plating process, consisting of a single cathodic on time or multiple cathodic on times of different current densities and single or multiple off times per cycle.
- Periodic pulse reversal, a bipolar waveform alternating between cathodic pulses and anodic pulses, can optionally be used as well.
- the anodic pulses can be inserted into the waveform before, after or in between the on pulse and/or before, after or in the off time.
- the anodic pulse current density is generally equal to or greater than the cathodic current density.
- the anodic charge (Q anod i c ) of the "reverse pulse" per cycle is always smaller than the cathodic charge (Qcathod.c)- Cathodic pulse on times range from 0.1 to 50 msec (1-50), off times from 0 to 500msec (1-100) and anodic pulse times range from 0 to 50 msec, preferably from 1 to 10msec.
- the duty cycle expressed as the cathodic on times divided by the sum of the cathodic on times, the off times and the anodic times, ranges from 5 to 100 %, preferably from 10 to 95 %, and more preferably from 20 to 80 %.
- the frequency of the cathodic pulses ranges from 1Hz to 1kHz and more preferably from l0Hz to 350Hz.
- Nano-crystalline coatings or free-standing deposits of metallic materials were ob- tained by varying process parameters such as current density, duty cycle, work piece temperature, plating solution temperature, solution circulation rates over a wide range of conditions.
- process parameters such as current density, duty cycle, work piece temperature, plating solution temperature, solution circulation rates over a wide range of conditions.
- Electrolyte solution temperature - 20 to 85 °C
- Electrolyte solution circulation/agitation rates ⁇ 10 liter per min per cm 2 anode or cathode area (0.0001 to 10 1/min.cm 2 )
- Anode oscillation rate 0 to 350 oscillations/min
- the present invention preferably provides a process for plating nanocrisalline metalls, metall matrix composites and microcomponents at deposition rates of at least 0,05 mm/h, preferably at least 0.075 mm/h, and more preferably at least 0,1 mm/h.
- the electrolyte preferably may be agitated by means of pumps, stirrers or ultrasonic agitation at rates of 0 to 750 ml/min/A (ml solution per minute per applied Ampere average current), preferably at rates ofO to 500 ml min/A.
- a grain refining agent or a stress relieving agent selected from the group of saccharin, coumarin, sodium lauryl sulfate and thiourea can be added to the electrolyte.
- This invention provides a process for plating nanocrystalline metal matrix composites on a permanent or temporary substrate optionally containing at least 5% by volume particulates, preferably 10% by volume particulates, more preferably 20% by volume particulates, even more preferably 30% by volume particulates and most preferably 40% by volume particulates for applications such as hard facings, projectile blunting armor, valve refurbishment, valve and machine tool coatings, energy absorbing armor panels, sound damping systems, connectors on pipe joints e.g. used in oil drilling applications, refurbishment of roller bearing axles in the railroad industry, computer chips, repair of electric motors and generator parts, repair of scores in print rolls using tank, barrel, rack, selective (e.g. brush plating) and continuous (e.g.
- the particulates can be selected from the group of metal powders, metal alloy powders and metal oxide powders of Al, Co, Cu, In, Mg, Ni, Si, Sn, V, and Zn; nitrides of Al, B and Si; C (graphite or diamond); carbides of B, Bi, Cr, Si, W; MoS 2 ; and organic materials such as PTFE and polymer spheres.
- the particulate average particle size is typically below lO ⁇ m, preferably below ljOOOnm (l ⁇ m), preferably 500nm, and more preferably below lOOnm.
- the process of this invention optionally provides a process for continuous (drum or belt) plating nanocrystalline foils optionally containing solid particles in suspension selected from metal powders, metal alloy powders and metal oxide powders of Al, Co, Cu, In, Mg, Ni, Si, Sn, V, and Zn; nitrides of Al, B and Si; C (graphite or diamond); carbides of B, Bi, Si, W; MoS 2 , and organic materials such as PTFE and polymer spheres to impart desired properties including hardness, wear resistance, lubrication, magnetic properties and the like.
- the drum or belt provides a temporary substrate from which the plated foil can be easily and continuously removed.
- the present invention it is also possible to produce nanocrystalline coatings by electroplating without the need to submerse the article to be coated into a plating bath.
- Brush or tampon plating is a suitable alternative to tank plating, particularly when only a portion of the work piece is to be plated, without the need to mask areas not to be plated.
- the brush plating apparatus typically employs a soluble or dimensionally stable anode wrapped in an absorbent separator felt to form the anode brush. The brush is rubbed against the surface to be plated in a manual or mechanized mode and electrolyte solution containing ions of the metal or metal alloys to be plated is injected into the separator felt.
- this solution also contains solid particles in suspension selected from metal powders, metal alloy powders and metal oxide powders of Al, Co, Cu, In, Mg, Ni, Si, Sn, V, and Zn; nitrides of Al, B and Si; C (graphite or diamond); carbides of Bi, Si, W; MoS 2 ; and organic materials such as PTFE and polymer spheres to impart desired properties including hardness, wear resistance, lubrication and the like.
- solid particles in suspension selected from metal powders, metal alloy powders and metal oxide powders of Al, Co, Cu, In, Mg, Ni, Si, Sn, V, and Zn; nitrides of Al, B and Si; C (graphite or diamond); carbides of Bi, Si, W; MoS 2 ; and organic materials such as PTFE and polymer spheres to impart desired properties including hardness, wear resistance, lubrication and the like.
- the relative motion between anode and cathode ranges from 0 to 600meters per minute,
- micro components for micro systems including micro-mechanical systems (MEMS) and micro-optical-systems with grain sizes equal to or smaller than 1 ,000nm can be produced.
- the maximum dimension of the microcomponent part is equal to or below 1mm and the ratio between the maximum outside dimension of the microcomponent part and the average grain size is equal to or greater than 10, preferably greater than 100.
- micro components of the present invention preferably may have an equiaxed microstructure throughout the plated component, which is relatively independent of component thickness and structure.
- micro components according to this invention have significantly improved property-dependent reliability and improved and tailor-made desired properties of MEMS structures for overall performance enhanced microsystems by preferably equiaxed electrodeposits, eliminating the fine grain to columnar grain transition in the microcomponent, and simultaneously reducing the grain size of the deposits below l,000nm.
- Figure 1 shows a cross-sectional view of a preferred embodiment of a drum plating apparatus.
- Figure 2 shows a cross sectional view of a preferred embodiment of a brush plat- ing apparatus
- Figure 3 shows a plan view of a mechanized motion apparatus for generating a mechanized stroke of the anode brush.
- FIG 1 schematically shows of a plating tank or vessel (1) filled with an electrolyte (2) containing the ions of the metallic material to be plated.
- the cathode in the form of a rotating drum (3) electrically connected to a power source (4).
- the drum is rotated by an electric motor (not shown) with a belt drive and the rotation speed is variable.
- the anode (5) can be a plate or conforming anode, as shown, which is electrically connected to the power source (4).
- FIG. 1 Three different anode dispositions can be used: Conformal anodes, as shown in Figure 1, that follow the contour of the submerged section of the drum (3), vertical anodes positioned at the walls of the tank (1) and horizontal anode positioned on the bottom of the tank (1).
- a foil (16) of metallic material being electrodeposited on the drum (3)
- the foil (16) is pulled from the drum surface emerging from the electrolyte (2), which is clad with the electro- formed metallic material.
- Figure 2 schematically shows a workpiece (6) to be plated, which is connected to the negative outlet of the power source (4).
- the anode (5) consists of a handle (7) with a conductive anode brush (8).
- the anode contains channels (9) for supplying the electrolyte solution (2) from a temperature controlled tank (not shown) to the anode wick (absorbent separator) (10) .
- the electrolyte dripping from the absorbent separator (10) is optionally collected in a tray (11) and recirculated to the tank.
- the absorbent separator (10) containing the electrolyte (2) also electrically insulates the anode brush (8) from the workpiece (6) and adjusts the spacing between anode (5) and cathode (6).
- the anode brush handle (4) can be moved over the workpiece (6) manually during the plating operation, alternatively, the motion can be motorized as shown in figure 3.
- Figure 3 schematically shows a wheel (12) driven by an adjustable speed motor (not shown).
- a traversing arm (13) can be rotatably attached (rotation axis A) to the rotating wheel (12) at various positions x at a slot (14) with a bushing and a set screw (not shown) to generate a desired stroke.
- the stroke lenght can be adjusted by the position x (radius) at which the rotation axis A of traversing arm is mounted at the slot (14).
- the traversing arm (13) is shown to be in an no-stroke, neutral position with rotation axis A in the center of the wheel (12).
- the traversing arm (13) has a second pivot axis B defined by a bearing (not shown), that is slidably mounted in a track (15).
- anode (5) having the same features as shown in Fig. 2 is attached to the traversing arm (13) and moves over the workpiece (6) in a motion depending on the position x.
- the anode (5) and the work- piece (6) are connected to positive and negative outlets of a power source (not shown), respectively.
- the cinematic relation is very similar to that of a steam engine.
- This invention relies on producing nanocrystalline coatings, foils and microsystem components by pulse electrodeposition. Optionally solid particles are suspended in the electrolyte and are included in the deposit.
- Nanocrystalline coatings for wear resistant applications to date have focused on increasing wear resistance by increasing hardness and decreasing the friction coefficient though grain size reduction below 1 OOnm. It has now been found that incorporating a sufficient volume fraction of hard particles can further enhance the wear resistance of nanocrystalline materials.
- the material properties can also be altered by e.g. the incorporation of lubricants (such as MoS 2 and PTFE).
- lubricants such as MoS 2 and PTFE.
- the particulates can be selected from the group of metal powders, metal alloy powders and metal oxide powders of Al, Co, Cu, In, Mg, Ni, Si, Sn, V, and Zn; nitrides of Al, B and Si; C (graphite or dia- mond); carbides of B, Bi, Si, W; MoS 2 ; and organic materials such as PTFE and polymer spheres.
- Nanocrystalline NiP-B 4 C nanocomposites were deposited onto Ti and mild steel cathodes immersed in a modified Watts bath for nickel using a soluble anode made of a nickel plate and a Dynatronix (Dynanet PDPR 20-30-100) pulse power supply. The following conditions were used:
- Anode/anode area soluble anode: Ni plate, 80cm 2
- Cathode/cathode area Ti or mild steel sheet/appr. 5cm 2 Cathode: fixed Anode: fixed
- Electrolyte temperature 60°C
- Electrolyte circulation rate vigorous agitation (two direction mechanical impeller)
- the hardness values of metal matrix composites possessing a nanocrystalline matrix structure are typically twice as high as conventional coarse-grained metal matrix composites.
- the hardness and wear properties of a nanocrystalline NiP-B 4 C composite containing 5.9weight% P and 45volume% B C are compared with those of pure coarse-grained Ni, pure nanocrystalline Ni and electrodeposited Ni-P of an equivalent chemical composition in the adjacent table.
- Material hard- ening is controlled by Hall-Petch grain size strengthening, while abrasive wear resistance is concurrently optimized by the incorporation of B C particulate.
- Nanocrystalline Co based nanocomposites were deposited onto Ti and mild steel cathodes immersed in a modified Watts bath for cobalt using a soluble anode made of a cobalt plate and a Dynatronix (Dynanet PDPR 20-30-100) pulse power supply. The following conditions were used:
- Anode/anode area soluble anode (Co plate)/ 80cm 2
- Cathode/cathode area Ti (or mild steel) sheet/appr. 6.5cm 2
- Peak cathodic current density O.lOOA/cm 2 Peak anodic current density: 0.300A/cm 2 Cathodic t on / t 0 f f / Anodic ton (tanodic): 16msec / 0msec / 2msec Frequency: 55.5 Hz
- Electrolyte circulation rate 0.15 ter/m ⁇ n/cm cathode area (no pump flow; agitation)
- Continuous plating to produce foils e.g. using drum plating nanocrystalline foils optionally containing solid particles in suspension selected from pure metals or alloys with particulate additives such as metal powders, metal alloy powders and metal oxide powders of Al, Co, Cu, In, Mg, Ni, Si, Sn, V, and Zn; nitrides of Al, B and Si; C (graphite or diamond); carbides of B, Bi, Si, W; and organic materials such as PTFE and polymer spheres to impart desired properties including hardness, wear resistance, lubrication, magnetic properties and the like has been ac- complished.
- Nanocrystalline metal foils were deposited on a rotating Ti drum partially immersed in a plating electrolyte.
- the nanocrystalline foil was electro- formed onto the drum cathodically, using a soluble anode made of a titanium container filled with anode metal and using a pulse power supply.
- a stream of the additional cation at a predetermined concentration was continuously added to the electrolyte solution to establish a steady state concentration of alloying cations in solution.
- a stream of the composite addition was added to the plating bath at a predetermined rate to establish a steady state content of the additive.
- Three different anode dispositions can be used: Conformal anodes that fol- low the contour of the submerged section of the drum, vertical anodes positioned at the walls of the vessel and horizontal anode positioned on the bottom of the vessel.
- Foils were produced at average cathodic current densities ranging from 0.01 to 5 A/cm 2 and preferably from 0.05 to 0.5 A/cm 2 .
- the rotation speed was - lo ⁇
- the foil thickness and this speed ranged from 0.003 to 0.15rpm (or 20 to lOOOcm/hour) and preferably from 0.003 to 0.05rpm (or 20 to 330cm hour)
- Example 3 metal matrix composite drum plating
- Nanocrystalline Co based nanocomposites were deposited onto a rotating Ti drum as described in example 3 immersed in a modified Watts bath for cobalt.
- the nanocrystalline foil 15cm wide was electroformed onto the drum cathodically, using a soluble cobalt anode contained in a Ti wire basket and a Dynatronix (Dy- nanet PDPR 20-30-100) pulse power supply. The following conditions were used:
- Anode/anode area conforming soluble anode (Co Pieces in Ti basket)/undetermined Cathode/cathode area: Ti 600cm
- Electrolyte circulation rate 0.151iter/min/cm 2 cathode area (no pump flow; agitation)
- the Co/P-SiC foil had a grain size of 12 nm, a hardness of 690 VHN, contained 1.5% P and 22volume% SiC.
- Nanocrystalline nickel-iron alloy foils were deposited on a rotating Ti drum partially immersed in a modified Watts bath for nickel.
- the nanocrystalline foil, 15cm wide was electroformed onto the drum cathodically, using a soluble anode made of a titanium wire basket filled with Ni rounds and a Dynatronix (Dynanet PDPR 50-250-750) pulse power supply. The following conditions were used:
- Anode/anode area conforming soluble anode (Ni rounds in a metal cage)/undetermined
- Cathode/cathode area submersed Ti dmm/appr. 600cm 2
- Cathode rotating at 0.018rpm (or 120cm/hour)
- Anode fixed
- Electrolyte temperature 60°C
- Electrolyte circulation rate 0.151iter/min/cm 2 cathode area
- composition 23-27 wt.%Fe Average grain size: 15 nm Hardness: 750Vickers
- Selective or brush plating is a portable method of selectively plating localized areas of a work piece without submersing the article into a plating tank. There are significant differences between selective plating and tank and barrel plating applications. In the case of selective plating it is difficult to accurately determine the cathode area and therefore the cathodic current density and/or peak current density is variable and usually unknown. The anodic current density and/or peak current density can be determined, provided that the same anode area is utilized during the plating operation, e.g. in the case of flat anodes. In the case of shaped anodes the anode area can not be accurately determined e.g.
- the "effective" anode area also changes during the plating operation.
- Selective plating is performed by moving the anode, which is covered with the absorbent separator wick and containing the electrolyte, back and forth over the work piece, which is typically performed by an operator until the desired overall area is coated to the required thickness.
- Selective plating techniques are particularly suited for repairing or refurbishing articles because brush plating set-ups are portable, easy to operate and do not require the disassembly of the system containing the work piece to be plated.
- Brush plating also allows plating of parts too large for immersion into plating tanks. Brush plating is used to provide coatings for improved corrosion resistance, improved wear, improved appearance (decorative plating) and can be used to salvage worn or mismachined parts.
- Brush plating systems and plating solutions are commercially available e.g. from Sifco Selective Plating, Cleveland. Ohio, which also provides mechanized and/or automated tooling for use in high volume production work.
- the plating tools used comprise the anode (DSA or soluble), covered with an absorbent, electrically non-conductive material and an insulated handle.
- anodes are typically made of graphite or Pt-clad titanium and may contain means for regulating the temperature by means of a heat exchanger system.
- the electrolyte used can be heated or cooled and passed through the anode to maintain the desired temperature range.
- the absorbent separator material contains and distributes the electrolyte solution between the anode and the work piece (cathode), prevents shorts between anode and cathode and brushes against the surface of the area being plated.
- a Sifco brush plating unit (model 3030 - 30A max) was set up.
- the graphite anode tip was inserted into a cotton pouch separator and either attached to a mechanized traversing arm in order to generate the "brushing motion" or moved by an operator by hand back and forth over the work piece, or as otherwise indicated.
- the anode assembly was soaked in the plating solution and the coating was deposited by brushing the plating tool against the cathodically charged work area that was composed of different substrates.
- a peristaltic pump was used to feed the electrolyte at predetermined rates into the brush plating tool.
- the electrolyte was allowed to drip off the work piece into a tray that also served as a "plating solution reservoir" from which it was recirculated into the electrolyte tank.
- the anode had flow-through holes/channels in the bottom surface to ensure good electrolyte distribution and electrolyte/work piece contact.
- the anode was fixed to a traversing arm and the cyclic motion was adjusted to allow uniform strokes of the anode against the substrate surface.
- the rotation speed was adjusted to increase or decrease the relative anode/cathode movement speed as well as the anode/substrate contact time at any one particular location.
- Brush plating was normally carried out at a rate of approximately 35-175 oscillations per minute, with a rate of 50-85 oscillations per minute being optimal. Electrical contacts were made on the brush handle (anode) and directly on the work piece (cathode). Coatings were deposited onto a number of substrates, including copper, 1018 low carbon steel, 4130 high carbon steel, 304 stainless steel, a 2.5in OD steel pipe and a weldclad 1625 pipe. The cathode size was 8cm 2 , except for the 2.5in OD steel pipe where a strip 3cm wide around the outside diameter was exposed and the weldclad 1625 pipe on which a defect repair procedure was performed. A Dynatronix programmable pulse plating power supply (Dynanet PDPR 20-30- 100) was employed.
- Nanocrystalline pure nickel was deposited onto an 8cm 2 area cathode with a 35cm 2 anode using the set-up described.
- the work piece has a substantially larger area than the anode.
- a work piece (cathode) was selected to be substantially smaller than the anode to ensure that the oversized anode, although being constantly kept in motion, always covered the entire work piece to enable the determination of the cathodic current density.
- NiCO was periodically added to the plating bath to maintain the desired Ni concentration. The following conditions were used:
- Anode/anode area graphite/35cm
- Cathode/cathode area mild steel/8cm 2
- Anode oscillating mechanically automated at 50 oscillations per minute
- Electrolyte temperature 60°C
- Electrolyte circulation rate 10ml solution per min per cm 2 anode area or 220ml solution per min per Ampere average current applied
- Nanocrystalline Co was deposited using the same set up described under the following conditions:
- Anode/anode area graph ⁇ te/35cm
- Cathode/cathode area mild steel/8cm 2
- Cathode stationary
- Anode oscillating mechanically automated at 50 oscillations per minute Anode versus cathode linear speed: 125cm/min Average cathodic current density: O.lOA/cm 2 ton/tofr: 2msec/6msec Frequency: 125Hz Duty Cycle: 25% Deposition time: lhour Deposition rate: 0.05mm/hr
- Electrolyte temperature 65°C
- Electrolyte circulation rate 10 mL solution per min per cm 2 anode area or 440 ml solution per min per Ampere average current applied
- Nanocrystalline Ni/20%Fe was deposited using the set up described before.
- a 1.5in wide band was plated on the OD of a 2.5in pipe by rotating the pipe along its longitudinal axis while maintaining a fixed anode under the following conditions:
- Anode/anode area/effective anode area graphite/35 cm 2 /undetermined
- Cathode/cathode area 2.5inch OD steel pipe made of 210A1 carbon steel/undetermined
- Electrolyte temperature 55°C
- Electrolyte circulation rate 0.44 liter solution per min per Ampere applied Electrolyte Formulation:
- a defect (groove) in a weldclad pipe section was filled in with nanocrystalline Ni using the same set up as in Example 1.
- the groove was about 4.5cm long, 0.5cm wide and had an average depth of approximately 0.175mm, although the rough finish of the defect made it impossible to determine its exact surface area.
- the area surrounding the defect was masked off and nano Ni was plated onto the defective area until its original thickness was reestablished.
- Anode/anode area graphite/35 cm
- Cathode/cathode area 1625/undetermined Cathode: stationary Anode: oscillating mechanically automated at 50 oscillations per minute Anode versus cathode linear speed: 125cm/min Average cathodic current density: undetermined ton toff: 2msec/6msec Frequency: 125Hz Duty Cycle: 25% Deposition time: 2hour Deposition rate:0.087mm/hr
- Electrolyte temperature 55°C
- Electrolyte circulation rate 0.44 liter solution per min per Ampere average current applied
- Microcomponents having overall dimensions below l,000 ⁇ m (1mm), are gaining increasing importance for use in electronic, biomedical, telecommunication, automotive, space and consumer applications.
- Metallic macro-system components with an overall maximum dimension of 1cm to over lm containing conventional grain sized materials (l-l,000 ⁇ m) exhibit a ratio between maximum dimension and grain size ranges from 10 to 10 6 . This number reflects the number of grains across the maximum part dimension.
- the maximum component size is reduced to below 1mm using conventional grain-sized material, the component can be potentially made of only a few grains or a single grain and the ratio between the maximum micro-component dimension and the grain size ranges approaches 1.
- electrodeposition initially starts with a fine grain size at the substrate material. With increasing de- posit thickness in the growth direction; however, the transition to columnar grains is normally observed.
- the thickness of the columnar grains typically ranges from a few to a few tens of micrometers while their lengths can reach hundreds of micrometers.
- the consequence of such structures is the development of anisotropic properties with increasing deposit thickness and the reaching of a critical thick- ness in which only a few grains cover the entire cross section of the components with widths below 5 or 10 ⁇ m.
- a further decrease in component thickness results in a bamboo structure resulting in a significant loss in strength.
- microstructure of electrodeposited micro-components currently in use is entirely incommensurate with property requirements across both the width and thickness of the component on the basis of grain shape and average grain size.
- parts made of conventionally grain-sized materials that have been known to suffer from severe reliability problems with respect to mechanical properties such as the Young modulus, yield strength, ultimate tensile strength, fatigue strength and creep behavior have been shown to be extremely sensitive to processing parameters associated with the synthesis of these components.
- Many of the problems encountered are caused by incommensurate scaling of key microstruc- tural features (i.e. grain size, grain shape, grain orientation) with the external size of the component resulting in unusual property variations normally not observed in macroscopic components of the same material.
- Metal micro-spring fingers are used to contact IC chips with high pad count and density and to carry power and signals to and from the chips.
- the springs provide high pitch compliant electrical contacts for a variety of interconnection structures, including chip scale semiconductor packages, high-density interposer connectors, and probe contactors.
- the massively parallel interface structures and assemblies enable high speed testing of separated integrated circuit devices affixed to a com- pliant carrier, and allow test electronics to be located in close proximity to the integrated circuit devices under test.
- micro-spring fingers require high yield strength and ductility.
- a 25 ⁇ m thick layer of nanocrystalline Ni was plated on 500 ⁇ m long gold-coated CrMo fingers using the following conditions:
- Cathode/cathode area Gold Plated CrMo/approximately 1 cm 2
- Cathode stationary Anode: stationary
- Average grain size 15-20nm
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- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
- Electroplating And Plating Baths Therefor (AREA)
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Priority Applications (19)
Application Number | Priority Date | Filing Date | Title |
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DE60225352T DE60225352T2 (de) | 2002-06-25 | 2002-06-25 | Verfahren zum elektroplattieren von metallischen und metallmatrix-komposite folien, beschichtungen und mikrokomponenten |
EP07002944A EP1826294A1 (en) | 2002-06-25 | 2002-06-25 | Process for electroplating metallic and metal matrix composite foils and microcomponents |
ES02754753T ES2301666T3 (es) | 2002-06-25 | 2002-06-25 | Proceso para galvanoplastia metalica y chapas compuestas de matriz metalica, recubrimientos y microcomponentes. |
EP02754753A EP1516076B1 (en) | 2002-06-25 | 2002-06-25 | Process for electroplating metallic and metall matrix composite foils, coatings and microcomponents |
CA002490464A CA2490464C (en) | 2002-06-25 | 2002-06-25 | Process for electroplating metallic and metall matrix composite foils, coatings and microcomponents |
KR1020047021188A KR100890819B1 (ko) | 2002-06-25 | 2002-06-25 | 금속 및 금속기지 복합 재료의 호일, 코팅을 전기 도금하는 방법과 미소 구성요소 |
DK02754753T DK1516076T3 (da) | 2002-06-25 | 2002-06-25 | Fremgangsmåde til elektroplettering af metalliske og metalmatrixkompositfolier, overtræk og mikrokomponenter |
AU2002321112A AU2002321112B2 (en) | 2002-06-25 | 2002-06-25 | Process for electroplating metallic and metall matrix composite foils, coatings and microcomponents |
US10/516,300 US20050205425A1 (en) | 2002-06-25 | 2002-06-25 | Process for electroplating metallic and metall matrix composite foils, coatings and microcomponents |
AT02754753T ATE387522T1 (de) | 2002-06-25 | 2002-06-25 | Verfahren zur elektroplattierung von metallischen und metall-matrix-composite folien, beschichtungen und mikrokomponenten |
JP2004514605A JP2005530926A (ja) | 2002-06-25 | 2002-06-25 | 金属および金属マトリックス複合体箔、コーティング、ならびに超小型部品を電気メッキするためのプロセス |
PT02754753T PT1516076E (pt) | 2002-06-25 | 2002-06-25 | Processo para electrodeposição de folhas, revestimentos e microcomponentes metálicos e compósitos de matrizes metálicas |
BRPI0215787-0B1A BR0215787B1 (pt) | 2002-06-25 | 2002-06-25 | Processo para eletrodeposição catódica de um material metálico selecionado em um substrato permanente ou temporário e microcomponente produzido por um processo de eletrodeposição de pulso |
PCT/EP2002/007023 WO2004001100A1 (en) | 2002-06-25 | 2002-06-25 | Process for electroplating metallic and metall matrix composite foils, coatings and microcomponents |
MXPA04011940A MXPA04011940A (es) | 2002-06-25 | 2002-06-25 | PROCESO PARA GALVANOPLASTIA METáLICA Y CHAPAS COMPUESTAS DE MATRIZ MATáLICA, RECUBRIMIENTOS Y MICROCOMPONENTES. |
US10/278,889 US20030234181A1 (en) | 2002-06-25 | 2002-10-24 | Process for in-situ electroforming a structural layer of metallic material to an outside wall of a metal tube |
IL16590404A IL165904A0 (en) | 2002-06-25 | 2004-12-21 | Process for electrolating metallic and metall matrix composite foils coatings and microcomponents |
ZA200410368A ZA200410368B (en) | 2002-06-25 | 2004-12-23 | Process for electroplating metallic and metal matrix composite foils, coating and microcomponents |
HK05107489A HK1075278A1 (en) | 2002-06-25 | 2005-08-25 | Process for electroplating metallic and metal matrix composite foils |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2002/007023 WO2004001100A1 (en) | 2002-06-25 | 2002-06-25 | Process for electroplating metallic and metall matrix composite foils, coatings and microcomponents |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/278,889 Continuation-In-Part US20030234181A1 (en) | 2002-06-25 | 2002-10-24 | Process for in-situ electroforming a structural layer of metallic material to an outside wall of a metal tube |
Publications (1)
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WO2004001100A1 true WO2004001100A1 (en) | 2003-12-31 |
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PCT/EP2002/007023 WO2004001100A1 (en) | 2002-06-25 | 2002-06-25 | Process for electroplating metallic and metall matrix composite foils, coatings and microcomponents |
Country Status (16)
Country | Link |
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EP (2) | EP1826294A1 (xx) |
JP (1) | JP2005530926A (xx) |
KR (1) | KR100890819B1 (xx) |
AT (1) | ATE387522T1 (xx) |
AU (1) | AU2002321112B2 (xx) |
BR (1) | BR0215787B1 (xx) |
CA (1) | CA2490464C (xx) |
DE (1) | DE60225352T2 (xx) |
DK (1) | DK1516076T3 (xx) |
ES (1) | ES2301666T3 (xx) |
HK (1) | HK1075278A1 (xx) |
IL (1) | IL165904A0 (xx) |
MX (1) | MXPA04011940A (xx) |
PT (1) | PT1516076E (xx) |
WO (1) | WO2004001100A1 (xx) |
ZA (1) | ZA200410368B (xx) |
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WO2004090361A3 (en) * | 2003-04-03 | 2004-11-18 | Timken Co | Corrosion tolerant rolling element bearing |
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EP1516076A1 (en) | 2005-03-23 |
MXPA04011940A (es) | 2005-03-31 |
AU2002321112A1 (en) | 2004-01-06 |
EP1516076B1 (en) | 2008-02-27 |
KR100890819B1 (ko) | 2009-04-06 |
IL165904A0 (en) | 2006-01-15 |
ZA200410368B (en) | 2006-07-26 |
DK1516076T3 (da) | 2008-06-23 |
ATE387522T1 (de) | 2008-03-15 |
CA2490464C (en) | 2008-09-02 |
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BR0215787B1 (pt) | 2013-12-03 |
DE60225352T2 (de) | 2008-06-12 |
AU2002321112B2 (en) | 2008-07-03 |
HK1075278A1 (en) | 2005-12-09 |
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CA2490464A1 (en) | 2003-12-31 |
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PT1516076E (pt) | 2008-03-11 |
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