CN102146573B - Method for preparing nano composite material by supercritical fluid electroforming - Google Patents

Method for preparing nano composite material by supercritical fluid electroforming Download PDF

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CN102146573B
CN102146573B CN 201110060620 CN201110060620A CN102146573B CN 102146573 B CN102146573 B CN 102146573B CN 201110060620 CN201110060620 CN 201110060620 CN 201110060620 A CN201110060620 A CN 201110060620A CN 102146573 B CN102146573 B CN 102146573B
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nano
negative electrode
template
composite material
electroforming
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CN102146573A (en
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雷卫宁
刘维桥
李小平
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Linyi Enke Development And Construction Co ltd
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Jiangsu University of Technology
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Abstract

The invention discloses a method for preparing nano composite material by supercritical fluid electroforming, which comprises the following steps of: (1) adding metal salt solution, nano granules and composite additive into a reactor of an electroforming device, stirring uniformly, introducing carbon dioxide gas, and stirring at the temperature of between 35 and 50 DEG C under the pressure of 8 to 20MPa to generate supercritical fluid electroforming solution containing the nano granules; (2) setting pulse interval at 1 to 5 microseconds, setting the pulse width at 10 to 30 microseconds, setting the current density at 1 to 3A/dm<2>, switching on a direct-current power supply, and making the metal ions and the nano granules in the metal salt solution deposited on a cathode template together to obtain a nano composite electroforming layer; and (3) after the deposition is completed, obtaining the nano composite material by corresponding treatment. The method can electroform the nano composite material electroforming layer with uniform nano granule dispersion, flat surface, compact tissue, fine crystal grain and excellent performance.

Description

The method of preparing nano composite material by supercritical fluid electroforming
Technical field
The invention belongs to the electro-chemical machining field, be specifically related to a kind of method of preparing nano composite material by supercritical fluid electroforming.
Background technology
The principle of composite electroformed technique is that the particle that will have property joins in electroforming solution as pottery, diamond etc., utilize conductive grand master pattern (perhaps metal parts) to make negative electrode, the metal sheet that is used for electroforming is made anode, under electric field action, make metal ion constantly with particle capture, become metal in cathodic reduction, jointly be deposited on cathode surface.During this time, anode metal becomes continuously ion and is dissolved in electroforming solution and replenishes, and the concentration that makes GOLD FROM PLATING SOLUTION belong to ion remains unchanged.When the composite electroforming deposit of negative electrode grand master pattern meets the requirements of thickness gradually, make itself and grand master pattern separate the i.e. acquisition electroforming part with excellent composite property opposite with the grand master pattern profile.If what negative electrode adopted is metal parts, can with the electroformed layer firm attachment on piece surface, form nano composite material protective layer (coating).Because the nano particle with unique properties is compounded in the middle of metallic matrix, the nano composite material of formation is having excellent properties aspect mechanical property and physicals, thereby in fields such as machinery, chemical industry and automobiles, the important application prospect is arranged.
But in composite electroformed process, especially in evenly being compounded in metal matrix material, nano particle also has a lot of problems.Wherein the most outstanding is agglomeration traits and the relatively poor problem of macro-uniformity that nano particle occurs in the electroforming process.Mostly adopt at present the modes such as stirring, ultrasonic vibration to process the agglomeration of nano particle, but because of grand master pattern (metal parts) different, electric field during electroforming, flow field uniformity are wayward etc., still can cause nanoparticle agglomerates and skewness in nano combined electroformed layer.The employing dispersion agent that also has solves agglomeration traits, but because of the effective content that has dispersion agent be difficult to control and its impact on the factors such as difficult grasp of the performance impact rule of cast layer, still can not solve well nanoparticle agglomerates and problem pockety.The reunion of nano particle and skewness will cause the cast layer mechanical property difference of different sites huge, have a strong impact on its use properties.
Pure material will be according to the difference of temperature and pressure, present the change of state such as liquid, gas, solid, if raising temperature and pressure, come the variation of observation state, can find so, if reach specific temperature, pressure, the phenomenon that liquid and gas interface disappear can appear, this point is called as stagnation point, and at Near The Critical Point, phenomenon jumpy occurs the physical property that all fluids such as density, viscosity, solubleness, thermal capacity, specific inductivity of fluid can occur.For example: when temperature and the pressure of water is elevated to (t=374.15 ℃ of stagnation point, when p=22.115MPa) above, just be in a kind of gaseous state that both had been different from, also be different from liquid and solid-state new fluid attitude--above-critical state, the water of this state namely is referred to as supercritical water.The critical temperature of carbonic acid gas is 31.1 ℃, and emergent pressure is 7.39Mpa.Chinese patent literature CN101092716A(application number 200710021504.1) the trickle electroforming process of a kind of supercutical fluid and device thereof are disclosed, the document is mainly the electrotyping forming micro-structure part, and be single metal electric cast layer, arrange from the additive, electrical parameter and the anode and cathode that adopt, it is unsuitable for containing the composite electroformed moulding of nano particle.
Summary of the invention
The object of the invention is to easily reunite in the electroforming process for nano particle, the problems such as the electroformed layer homogeneity is wayward, provide a kind of nanoparticulate dispersed evenly, the method for the preparing nano composite material by supercritical fluid electroforming of tiny, the excellent performance of surfacing, dense structure, crystal grain.
The technical scheme that realizes the object of the invention is: a kind of method of preparing nano composite material by supercritical fluid electroforming, have following steps: 1. add metal salt solution, nano particle and composite additive in the reactor of electrotyping forming device, pass into carbon dioxide after stirring, stir under the 32 ℃~temperature of 50 ℃ and the pressure of 8MPa~20MPa and generate the supercutical fluid electroforming solution that contains nano particle; Described electrotyping forming device also has negative electrode, anode, heater coil and mechanical stirrer; Described negative electrode comprises negative electrode template and cathode body, and described anode comprises anode template and anode body; 2. recurrent interval is set is 1 microsecond~5 microseconds, and pulse width is 10 microseconds~30 microseconds, and current density is 1A/dm 2~3A/dm 2, connect direct supply, the metal ion in metal salt solution is deposited on the negative electrode template together with nano particle, obtain nano combined electroformed layer; 3. deposit complete after, obtain nano composite material by respective handling.
The metal salt solution of above-mentioned steps described in 1. is nickel salt solution or copper salt solution; Described nano particle is Nano diamond particle or nano-ceramic particle; Described composite additive is comprised of dodecyl compounds and ether compound.The concentration of described metal salt solution is 200g/L~500g/L, and the concentration of described nano particle is 5g/L~15g/L, and the concentration of described composite additive is 0.3g/L~3.0g/L.
Above-mentioned steps 1. in preparation also can add boric acid as the galvanic deposit sustained release dosage during electroforming solution, the concentration of boric acid is 30g/L~60g/L.
The anode template of above-mentioned steps described in 1. is net-shaped metal plate; Negative electrode template and the equal horizontal positioned of anode template, and the anode template is positioned at the top of negative electrode template.
Described electrotyping forming device also has the adjustment plate; Step also is included in the distance of adjusting in the scope of 1cm~5cm with described adjustment plate in the electroforming process between negative electrode template and anode template in 2..
The described mechanical stirrer of above-mentioned steps in 1. has two, and alr mode is that level is to intermittent stirring.
Described negative electrode template is grand master pattern or metal parts.
Described negative electrode template is grand master pattern; The respective handling of step described in 3. is: utilize thermal expansivity different of nano combined electroformed layer and grand master pattern, by heating or cooling, nano combined electroformed layer is separated from grand master pattern, obtain the nano combined electroformed layer opposite with the grand master pattern profile; Perhaps add acid/alkali that grand master pattern is corroded, keep nano combined electroformed layer.
Described negative electrode template is metal parts; The respective handling of step described in 3. is: by pickling, make nano combined electroformed layer firmly be deposited on the metal parts surface, obtain nano-composite plate.
The positively effect that the present invention has: (1) method of the present invention can electroforming goes out that nano particle is uniformly dispersed, surfacing, dense structure, crystal grain are tiny, the nano composite material electroformed layer of excellent performance.(2) selection of additive is the factor of supercutical fluid electrotyping forming most critical, the present invention is directed to the characteristics of the electroforming solution that contains nano particle, selected dodecyl compounds and ether compound to form composite additive, and the concentration of composite additive is controlled at 0.3g/L~3.0g/L, and the concentration of nano particle is controlled at 5g/L~15g/L, make nano particle and metal ion well electroforming on the negative electrode template, realize the supercutical fluid electrotyping forming of nano composite material.(3) the present invention is by adopting cancellated anode template and anode template and negative electrode template horizontal positioned and negative electrode template being positioned at negative electrode template top, adopt simultaneously level to the intermittent stirring mode, make like this nano particle that Subsidence trend is arranged in electroforming solution, thereby improve homogeneity and consistence in nano combined electroforming process.(4) the present invention can form the nano-composite plate of excellent performance on the metal parts surface.(5) the present invention can be according to using needs, and by the control to nano particle add-on and electrical parameter, the crystal grain of preparing different nano-particle content, different thickness is tiny, the nano combined electroformed layer of homogeneous chemical composition, excellent performance.
Description of drawings
Fig. 1 is the schematic diagram of the device of method employing of the present invention.
Fig. 2 is that A in Fig. 1 is to partial schematic diagram, in order to represent mechanical stirrer and reactor location relation.
Mark in above-mentioned accompanying drawing is as follows:
Electrotyping forming device 1, reactor 11, reactor linings 11-1, reactor body 11-2, inlet mouth 12, negative electrode 13, negative electrode template 13-1, cathode body 13-2, anode 14, anode template 14-1, anode body 14-2, adjustment plate 15, heater coil 16, mechanical stirrer 17, leakage fluid dram 18, carbon dioxide steel cylinder 2, high-pressure pump 3, direct supply 4, negative pole 41, anodal 42.
Embodiment
(embodiment 1)
See Fig. 1, the device that the method for the present embodiment adopts comprises electrotyping forming device 1, carbon dioxide steel cylinder 2, high-pressure pump 3 and direct supply 4.
Electrotyping forming device 1 has reactor 11, negative electrode 13, anode 14, adjusts plate 15, heater coil 16 and mechanical stirrer 17.Reactor 11 is the seal-off pressure container, comprises reactor body 11-2 and reactor linings 11-1.Reactor body 11-2 adopts stainless steel or High Strength Structural Steel to process, and what reactor linings 11-1 adopted is corrosion resistant tetrafluoroethylene material.The top of reactor body 11-2 is provided with inlet mouth 12 and leakage fluid dram 18.Negative electrode 13 comprises cathode body 13-2 and negative electrode template 13-1, and anode 14 comprises anode body 14-2 and anode template 14-1.The main body of anode template 14-1 is net-shaped metal plate, and in the material of this net-shaped metal plate and metal salt solution contained metallographic phase with, can both play the effect of conduction for fine copper plate or pure nickel plate, also play the effect that replenishes metal ion.Anode template 14-1 also is provided with the mounting rod that is fixed together with net-shaped metal plate.Adjust on the plate body of plate 15 according to from top to bottom order and be provided with one group of open holes, be used for adjusting the distance between negative electrode template 13-1 and anode template 14-1, thereby make anode and cathode rationally shield, improve electric field distribution.Heater coil 16 is around the arranged outside of reactor body 11-2.See Fig. 2, mechanical stirrer 17 has two, and along continuous straight runs is fixed on the both sides of reactor 11, thereby the level that realizes is to stirring.
Take the Nano diamond matrix material as example, the preparation method has following steps:
1. add nickel salt solution, boric acid, Nano diamond particle and composite additive in the reactor 11 of electrotyping forming device 1, stirred 30 minutes, it is fully mixed.Wherein nickel salt solution is the mixing solutions of single nickel salt and nickelous chloride, and additive is sodium lauryl sulphate and ether.The concentration of each material is: single nickel salt 370g/L, nickelous chloride 74g/L, boric acid 44g/L, Nano diamond particle 12 g/L, sodium lauryl sulphate 0.5g/L, ether 0.8 g/L.
Start high-pressure pump 3, carbon dioxide in carbon dioxide steel cylinder 2 is passed into reactor 11 from inlet mouth 12, control pressure is 8MPa, make simultaneously exchange current pass through heater coil 16, and make reactor body 11-2 be heated under the effect of electromagnetic induction, by the control of the size of the strength of current of exchange current is controlled at 50 ℃ with temperature, stirs under above-mentioned pressure and temperature and form the supercutical fluid electroforming solution that contains the Nano diamond particle.
The negative pole 41 of direct supply 4 is electrically connected to the cathode body 13-2 of electrotyping forming device 1, and cathode body 13-2 is electrically connected to negative electrode template 13-1; The positive pole 42 of direct supply 4 is electrically connected to the anode body 14-2 of electrotyping forming device 1, adjusting plate 15 electrical connections is fixed on anode body 14-2, anode template 14-1 is electrically connected to be fixed on by its mounting rod and adjusts on plate 15, and be positioned at a corresponding open holes place that adjusts plate 15, thereby make anode template 14-1 be electrically connected to anode body 14-2 by adjusting plate 15.The recurrent interval that direct supply 4 is set is 3 microseconds, and pulse width is 20 microseconds, and current density is 2A/dm 2With negative electrode template 13-1 and anode template 14-1 horizontal positioned, and anode template 14-1 is positioned at the top of negative electrode template 13-1, adjusting simultaneously the position of the open holes on plate 15 by selection, is 3cm and make the distance between negative electrode template 13-1 and anode template 14-1.
Connect direct supply 4, make nickel ion and Nano diamond particle deposit to quickly and efficiently negative electrode template 13-1, the crystal grain that obtains required nano-particle content and thickness is tiny, the nano combined electroformed layer of homogeneous chemical composition, excellent performance.In whole process, mechanical stirrer 17 adopts radially intermittent stirring.
3. the negative electrode template 13-1 of the present embodiment is grand master pattern, after electroforming is complete, mode by heating is separated nano combined electroformed layer from grand master pattern (negative electrode template 13-1), obtain namely that nano particle is evenly distributed, dense structure, crystal grain are tiny, surfacing, nano composite material electroformed layer excellent performance, opposite with the grand master pattern profile, by leakage fluid dram 18, the supercutical fluid electroforming solution is imported in gas-liquid separator at last, the carbon dioxide of separation and electroforming solution are recovered to respectively recycle in retrieving arrangement.

Claims (7)

1. the method for a preparing nano composite material by supercritical fluid electroforming is characterized in that having following steps:
1. add metal salt solution, nano particle and composite additive in the reactor (11) of electrotyping forming device (1), pass into carbon dioxide after stirring, stir under the 32 ℃~temperature of 50 ℃ and the pressure of 8MPa~20MPa and generate the supercutical fluid electroforming solution that contains nano particle; Described electrotyping forming device (1) also has negative electrode (13), anode (14), heater coil (16) and mechanical stirrer (17); Described negative electrode (13) comprises negative electrode template (13-1) and cathode body (13-2), and described anode (14) comprises anode template (14-1) and anode body (14-2);
Described metal salt solution is nickel salt solution or copper salt solution, and the concentration of metal salt solution is 200g/L~500g/L;
Described nano particle is Nano diamond particle or nano-ceramic particle, and the concentration of described nano particle is 5g/L~15g/L;
Described composite additive is comprised of sodium lauryl sulphate and ether, and the concentration of composite additive is 0.3g/L~3.0g/L;
Anode template (14-1) is net-shaped metal plate; Negative electrode template (13-1) and the equal horizontal positioned of anode template (14-1), and anode template (14-1) is positioned at the top of negative electrode template (13-1);
2. recurrent interval is set is 1 microsecond~5 microseconds, and pulse width is 10 microseconds~30 microseconds, and current density is 1A/dm 2~3A/dm 2, connect direct supply (4), the metal ion in metal salt solution is deposited to together with nano particle on negative electrode template (13-1), obtain nano combined electroformed layer;
3. deposit complete after, obtain nano composite material by respective handling.
2. the method for preparing nano composite material by supercritical fluid electroforming according to claim 1 is characterized in that: step also can add the boric acid as the galvanic deposit sustained release dosage in 1. during the preparation electroforming solution, and the concentration of boric acid is 30g/L~60g/L.
3. the method for preparing nano composite material by supercritical fluid electroforming according to claim 1, it is characterized in that: described electrotyping forming device (1) also has adjustment plate (15); Step also is included in the distance of adjusting in the scope of 1cm~5cm with described adjustment plate (15) in the electroforming process between negative electrode template (13-1) and anode template (14-1) in 2..
4. the method for preparing nano composite material by supercritical fluid electroforming according to claim 1 is characterized in that: the described mechanical stirrer (17) of step in 1. has two, and alr mode is that level is to intermittent stirring.
5. the method for preparing nano composite material by supercritical fluid electroforming according to claim 1 is characterized in that: described negative electrode template (13-1) is grand master pattern or metal parts.
6. the method for preparing nano composite material by supercritical fluid electroforming according to claim 5 is characterized in that: described negative electrode template (13-1) is grand master pattern; The respective handling of step described in 3. is: utilize thermal expansivity different of nano combined electroformed layer and grand master pattern, by heating or cooling, nano combined electroformed layer is separated from grand master pattern, obtain the nano combined electroformed layer opposite with the grand master pattern profile; Perhaps add acid/alkali that grand master pattern is corroded, keep nano combined electroformed layer.
7. the method for preparing nano composite material by supercritical fluid electroforming according to claim 5 is characterized in that: described negative electrode template (13-1) is metal parts; The respective handling of step described in 3. is: by pickling, make nano combined electroformed layer firmly be deposited on the metal parts surface, obtain nano-composite plate.
CN 201110060620 2011-03-14 2011-03-14 Method for preparing nano composite material by supercritical fluid electroforming Expired - Fee Related CN102146573B (en)

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