CN101049577A - Cellulated wiremesh carrier with alumina coat, and preparation method - Google Patents
Cellulated wiremesh carrier with alumina coat, and preparation method Download PDFInfo
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- CN101049577A CN101049577A CN 200710010359 CN200710010359A CN101049577A CN 101049577 A CN101049577 A CN 101049577A CN 200710010359 CN200710010359 CN 200710010359 CN 200710010359 A CN200710010359 A CN 200710010359A CN 101049577 A CN101049577 A CN 101049577A
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Abstract
A cellular metallic wire net carrier with coated aluminum oxide layer is composed of a metallic carrier and a coated layer and has an internal 3D through structure. Its preparing process includes such steps as preparing the planar metallic wire nets and corrugated metallic wire nets from stainless steel wire, pre-treating, preparing electric depositing liquid from gamma-Al2O3 powder, electric depositing to form a coated aluminum oxide layer on said metallic wire nets, stacking them in stagger mode, and binding them together by the strips of metallic wire net.
Description
Technical field
The present invention relates to a kind of preparation of metallic carrier for catalyst, specifically, relate to a kind of preparation that is applicable to the catalyst carrier that gas solid catalytic reaction adopted that environmental protection field such as motor-vehicle tail-gas, stationary source tail-gas and catalytic combustion field relate to, simultaneously, also relate to the preparation of metal carrier surface aluminum oxide coating layer, belong to the metallic carrier preparing technical field.
Background technology
The monolithic construction carrier is a kind of carrier with numerous parallel, continuous single channel designs, also often is called honeycomb support.Because the special put-through channel structure of carrier makes honeycomb support have low pressure drop, bed is evenly distributed, and catalyst abrasion is little, amplifies characteristics such as simple, has overcome the problem of conventional granulates type carrier.
The monolithic construction carrier is widely used in environmental protection field such as purifying vehicle exhaust, stationary source tail-gas pollutes (power plant, refinery exhaust and chemical plant flue gas) and the related gas-solid catalysis in catalytic combustion field.In addition, the monolithic construction carrier also is used in some other field.In multinomial catalytic reactions such as petrochemical industry, chemical catalysis, fine chemistry industry.Wherein purifying vehicle exhaust is the application quantity maximum, the field that technology is the most ripe.
Because vehicle operational mode is different with load, travel speed and pavement behavior, therefore require catalyst carrier to have: higher heat endurance and mechanical strength comprise wearability, hardness, compression strength and good shock-resistant and vibration performance; Higher specific surface area and lower specific heat capacity etc.The monolithic construction catalytic carrier is the catalyst carrier that generally adopts in the existing catalytic purifier for motor vehicle exhaust.According to the difference of carrier material, can be divided into ceramic monolith and metallic carrier.What wherein the overwhelming majority was used is the monoblock type ceramic monolith.But the ceramic monolith mechanical strength is low, and is easily broken, and service life is short etc., adopts metallic carrier can overcome above-mentioned deficiency.So the carrier that is made of metal has caused people's extensive concern.
Metallic carrier has higher specific area with respect to ceramic monolith, littler exhaust resistance and higher mechanical strength, and because the specific heat capacity of metallic carrier is low.The thermal capacitance of metallic carrier is little, the thermal conductivity height, the rate of heat addition of catalyst in the time of on the one hand can improving automobile starting, when improving cold start-up to the clean-up effect of tail gas; In addition, can also improve the uniformity of carrier inside Temperature Distribution, particularly the unburnt gas of engine interior burns in catalytic cleaner and emits a large amount of when hot, if ceramic monolith may cause the carrier hot-spot slowly because of internal heat transfer, be that carrier is damaged, metallic carrier then can be avoided the generation of this damage effectively.
At present, because total many advantages of metallic carrier, the preparation that attracts people that the improvement and the metallic carrier of its structure shown coating.For the metallic carrier moulding process, typical example:
(1) patent application delivered in State Intellectual Property Office of the People's Republic of China of people such as Zhong Sen normal treatment: " metallic carrier for catalyst " [application (patent) number: 98125354.7; Open (bulletin) number: CN1222636] in the patent application, its scheme is: metallic carrier has the honeycomb molded body and the cylindrical shell that is coated on this honeycomb molded body outer circumferential side that become cylindrical shape and contain many passages that extend along axis direction, in this metallic carrier for catalyst, above-mentioned cylindrical shell is made of the ferrite-group stainless steel of a kind of Mo of containing.Advantage: improved the capable performance of housing high-temperature oxidation greatly.Shortcoming: (1) metallic carrier inside is still stacked by corrugated metal foil and tabular metal forming, rolls into the monolithic devices structure, and its duct all is independently, does not exist mass transfer and heat transfer diametrically; (2) coating material is easily piled up in carrier corner, has influenced the dispersion of catalytic active component; (3) complicated process of preparation of carrier, price is higher relatively.
For the technology of preparing of metal carrier surface coating, typical example:
(1) people such as Xiaodong Wu is at Surf.Coat.Technol.2001, the article of delivering on the 145:226-232: in " structure of the aluminum oxide coating layer of plasma sputter deposition and character " (Structure andperformance of γ-alumina washcoat deposited by plasma spraying) literary composition, its scheme is: the method for utilizing plasma sputtering, operating voltage is 75-80V, electric current is 500A, obtains aluminum oxide coating layer on the FeCrAl stainless steel carrier.Advantage: the aluminum oxide coating layer of acquisition and metallic carrier adhere to very firm.Shortcoming: the coating that (1) obtains causes the specific area of coating to reduce because course of work temperature is too high, and part γ-Al in the coating
2O
3Be converted into α-Al
2O
3(2) preparation process operation more complicated; (3) equipment is relatively more expensive, and needs to introduce gas Ar, H
2And N
2Gas.
(2) people such as Su Zhao is at Surf.Coat.Technol.2003, the article of delivering on the 167:97-105: " good γ-Al of preparation adhesive force on the FeCrAl metallic carrier
2O
3The method of coating " (A method to formwell-adhered γ-Al
2O
3Layers on FeCrAl metallic supports) in the literary composition, its scheme is: adopt three-step approach to prepare γ-Al on the FeCrAl metallic carrier
2O
3Coating: the first step, to metallic carrier pre-oxidation; Second step impregnated in boehmite colloidal sol, and roasting forms thin oxide layer then; In the 3rd step, impregnated in γ-Al
2O
3The slurries roasting forms aluminum oxide coating layer.Advantage: (1) metallic carrier is through pre-oxidation treatment, and its surface forms alumina whisker, has improved specific area, helps the firm attachment of aluminum oxide coating layer; (2) pre-preg through high-temperature roasting, forms the adhesive force that the aluminium oxide thin layer of being made up of little crystal grain has improved aluminum oxide coating layer in boehmite colloidal sol; (3) aluminum oxide coating layer has reasonable heat resistanceheat resistant to shake and resists ultrasonic concussion performance.Shortcoming: (1) carrier and Bond Strength of Coating are low, and coating is chapped, and cause disbonding easily; (2) the metallic carrier pre-oxidation treatment need be at 950 ℃ of roasting 10h, and it is bigger to consume energy.
Summary of the invention
The objective of the invention is to overcome that prior art exists: (1) lacks reactant mass transfer and heat transfer diametrically because the metallic carrier inner passage is separate; (2) preparation technology of carrier is complicated, and the joint needs welding, and price is higher relatively; (3) preparation technology of coating complexity, equipment are relatively more expensive; (4) adhesion is relatively poor between metallic carrier and the coating, and coating is easily chapped, the deficiency of peeling off, and provide a kind of moulding process simple, mass transfer and good heat-transfer, a kind of Cellulated wiremesh carrier of coating adhesion-tight, special proposition technical solution of the present invention with aluminum oxide coating layer.
A kind of Cellulated wiremesh carrier with aluminum oxide coating layer proposed by the invention comprises coating and metallic carrier, it is characterized in that:
A) Cellulated wiremesh carrier [6] is the alternate alternately accumulation with a plurality of corrugated woven wire [4] of a plurality of tabular woven wires [3] by the adhesion-tight aluminum oxide coating layer, by the moulding of strip metal silk screen [5] binding parcel;
B) Cellulated wiremesh carrier [6] inside is three-dimensional permeable structures, and the carrier framework material is the stainless steel metal silk screen, meshcount 5～40;
C) aluminum oxide coating layer on tabular woven wire [3] and corrugated woven wire [4] surface is with γ-Al
2O
3Powder is a deposition materials, and its deposit thickness is 20～80 μ m, and should finish before Cellulated wiremesh carrier [6] assembled formation.
Of the present invention being further characterized in that: the corrugated woven wire tooth depth that constitutes Cellulated wiremesh carrier is 2.0～4.0mm, and space width is 4.5～5.0mm; By the Cellulated wiremesh carrier [6] that the peaceful plate-shape metal silk screen of corrugated woven wire [4] [3] is constituted, the number of plies of its corrugated woven wire manys one deck than the tabular woven wire number of plies; The shape of Cellulated wiremesh carrier [6] and size are to determine according to the shape and size size of the inside reactor of reality use.
A kind of preparation method with Cellulated wiremesh carrier of aluminum oxide coating layer proposed by the invention is characterized in that preparation process is as follows:
The first step, the preliminary treatment of stainless steel metal silk screen
With 30min in the hydrochloric acid solution of tabular woven wire [3] and corrugated woven wire [4] immersion 0.1mol/L, take out the back and use deionized water rinsing, and then 100～120 ℃ of down dry 5～8h; Second step, the preparation of electrodeposit liquid
In the absolute ethyl alcohol of continuous stirring, add the alcoholic solution of polyacrylic acid and aluminium isopropoxide, then add alumina powder and a spot of aluminium powder; Prescription is in the deposit fluid: polyacrylic acid is 0.204～61.044mg/L, and aluminium isopropoxide is 0.06～0.6g/L, and aluminium oxide is 40.0g/L, and aluminium powder is 4.0g/L, and is last, deposit fluid sonic oscillation 40min;
The 3rd step, the electro deposition oxidation aluminized coating
With the tabular woven wire [3] or the corrugated woven wire [4] that need deposited coatings is negative electrode, and stainless steel flat plate is an anode, and deposition voltage is 5～30V; After the electro-deposition, at room temperature dry, place Muffle furnace to rise to 500～800 ℃ then, insulation 2～3h with the programming rate of 120 ℃/h; At last, reduce to room temperature; The aluminum oxide coating layer thickness that deposition makes is 20～80 μ m;
The 4th step, the assembled formation of Cellulated wiremesh carrier
The a plurality of tabular woven wires [3] and a plurality of corrugated woven wire [4] that have deposited the oxidation aluminized coating are alternately piled up, and the number of plies that makes the corrugated woven wire manys one deck than the tabular woven wire number of plies, be housing binding parcel with strip metal silk screen [5] then, its shell joint place is by as the woven wire two ends of housing, and promptly strip metal silk screen termination [7] and strip silk screen end limit [8] are interlaced passes moulding.
A kind of Cellulated wiremesh carrier proposed by the invention with aluminum oxide coating layer, the order number of carrier framework material stainless steel metal silk screen can not be too big, when the order number less than 5 the time, the aperture of silk screen is bigger, after being processed into metallic carrier, the specific area in the unit volume reduces; When the order number greater than 40 the time, the boring ratio comparatively dense of silk screen, when being processed into metallic carrier and using, the resistance that gas passes through strengthens, and can not bring into play the superior function of wire mesh carrier.Processing corrugated woven wire, when tooth depth was higher than 4.0mm, the woven wire number of plies of arranging in the unit volume wire mesh carrier had reduced, thereby reduced the specific area in the unit volume; When tooth depth is lower than 2.0mm, can not well form passage.
Baking temperature and being as the criterion with metallic carrier and coating bone dry drying time in the preprocessing process of a kind of Cellulated wiremesh carrier with aluminum oxide coating layer proposed by the invention.In the dry run,, the temperature of drying need the dry time oversize when being lower than 100 ℃; Baking temperature is high more, drying time the long more drying that helps woven wire, still, temperature is higher than 120 ℃ and time and surpasses 8h and then consume the too much energy.
A kind of preparation method proposed by the invention with Cellulated wiremesh carrier coating of aluminum oxide coating layer, the selection of electro-deposition voltage is relevant with the thickness of aluminum oxide coating layer, when area one timing of the woven wire that needs deposited coatings, the thickness of aluminum oxide coating layer increases along with the increase of electro-deposition voltage; When the thickness one that needs coating deposited regularly, need the area of woven wire of deposited coatings big more, the electro-deposition voltage that then needs is big more.The composition of electrodeposit liquid also affects the deposition of coating and the bond strength between coating and the woven wire.When polyacrylic concentration is the polyacrylic acid of 2.035g/L, can obtain uniform certain thickness aluminum oxide coating layer.Along with polyacrylic concentration increases, the more and more thinner and tack of the aluminum oxide coating layer that obtains when polyacrylic concentration surpasses 61.044g/L, does not have alumina deposit to arrive the wire mesh carrier surface worse and worse basically.When the concentration of aluminium isopropoxide is 0.18g/L when promptly adding the 3g/L aluminium isopropoxide ethanol solution of 3ml, the quality maximum of unit volume woven wire alumina coating on surface.And the heat resistanceheat resistant of the coating that obtains under this concentration performance of shaking is good.When the concentration of aluminium isopropoxide was greater than or less than this value, the quality of unit volume woven wire alumina coating on surface all can reduce.
In addition, sintering temperature is also influential to it, and when sintering temperature was lower than 500 ℃, coating can not be firm attached to metal carrier surface; The high more raising that helps adhesion between coating and the woven wire again of temperature, but temperature can not surpass 800 ℃, otherwise can cause γ-Al
2O
3To α-Al
2O
3Transformation.When sintering temperature was 800 ℃, the aluminum oxide coating layer that obtains was dense, adhere to evenly, the surface without any crackle.And aluminum oxide coating layer shows than more superior heat resistanceheat resistant when 500 ℃ of roastings shake performance and anti-mechanical oscillation performance through 800 ℃ of roastings.
Major advantage of the present invention is:
(1) method that adopts electro-deposition is at woven wire surface preparation aluminum oxide coating layer, and aluminum oxide coating layer is evenly attached to its surface.By adding aluminium isopropoxide, roasting has improved the thermal shock resistance and the anti-mechanical oscillation performance of coating under aluminium powder and the high temperature;
(2) with the aluminium oxide raw material, at the γ-Al of woven wire surface preparation
2O
3Coating surface is not chapped;
(3) moulding process is simple, and the tabular woven wire for preparing aluminum oxide coating layer is stacked alternately with the corrugated woven wire is in the same place, and with strip metal silk screen binding parcel, the joint does not need welding, has reduced cost of manufacture to a certain extent yet.
Description of drawings
The present invention is provided with 3 width of cloth accompanying drawings altogether, now is respectively described below:
Fig. 1 is the sem photograph (SEM) of aluminum oxide coating layer on the woven wire that 800 ℃ of roasting temperature 2h obtain
The sem photograph of aluminum oxide coating layer on the woven wire of the present invention is to adopt the JSM-5600LV ESEM, at accelerating potential is to take under the condition of 20kV.As seen from the figure, aluminum oxide coating layer [1] adheres to even, fine and close, does not chap in the surface.
Fig. 2 is aluminum oxide coating layer and γ-Al on the woven wire that 800 ℃ of roasting temperature 2h obtain
2O
3Powder X-ray diffractogram (XRD) relatively
The X-ray diffractogram of aluminum oxide coating layer on the woven wire of the present invention is to adopt ShimadzuLabX-6000 type X-ray diffractometer to analyze.The abscissa of spectrogram is represented the angle of diffraction of crystal, ordinate representative counting.As seen from the figure, aluminum oxide coating layer still keeps γ-Al through 800 ℃ of roastings
2O
3Crystalline form [2].
Fig. 3 is a kind of Cellulated wiremesh carrier structural representation with aluminum oxide coating layer that the present invention proposes
Show among the figure that Cellulated wiremesh carrier [6] is the equidirectional alternately accumulation of the peaceful plate-shape metal silk screen of corrugated woven wire [4] [3] of being adhered to aluminum oxide coating layer by multilayer, and strip metal silk screen [5] from the bottom surface of corrugated woven wire peace plate-shape metal silk screen along the side the wearing of the end limit [8] by strip metal silk screen termination [7] and strip metal silk screen at the top at last around folding and carrier structure is fixed, in process, can not have the loss of coating owing to the strip metal silk screen has coating to die.
Fig. 4 is the preparation technology's schematic flow sheet with Cellulated wiremesh carrier of aluminum oxide coating layer
The assembling of Cellulated wiremesh carrier [6], the first step is prepared raw material: adhere to tabular woven wire [3], the corrugated woven wire [4] of aluminum oxide coating layer and the strip metal silk screen [5] that does not adhere to aluminum oxide coating layer; Second step, strip metal silk screen [5] is placed on the bottom, adhere on the corrugated woven wire [4] of aluminum oxide coating layer according to one deck then and add the order that one deck adheres to the tabular woven wire [3] of aluminum oxide coating layer, alternately pile up the cube structure that forms multilayer, and last one deck should be the corrugated woven wire; The 3rd goes on foot, and is enclosed with the cube structure of tabular woven wire and corrugated woven wire accumulation formation as housing with strip metal silk screen [5]; At last, the termination [7] of strip metal silk screen is passed folding the forming of metal mesh opening on strip metal silk screen end limit [8].Dotted arrow is expressed as on the strip metal silk screen among the figure, the process that the tabular woven wire alternately is deposited in the corrugated woven wire; Solid arrow is expressed as piles up the sandwich construction that forms with tabular woven wire and corrugated woven wire, with the process of strip metal silk screen parcel assembling Cellulated wiremesh carrier [6].Clear for drawing, on the Cellulated wiremesh carrier behind the assembled formation [6], screen net structure does not draw.
Specific embodiment
Below by concrete embodiment, further specify the preparation method's of Cellulated wiremesh carrier details with aluminum oxide coating layer.
Embodiment 1
The method according to this invention can be the aluminum oxide coating layer of 20 μ m at woven wire surface preparation thickness, and the Cellulated wiremesh carrier volume after the moulding is less, can satisfy the needs of breadboard catalytic reaction.
The preparation of implementing
With the order number is that 40 woven wire is cut to 1.5 * 1.5cm
2Woven wire be the tabular woven wire of forming Cellulated wiremesh carrier, it is wide that the corrugated woven wire then is of a size of 1.5cm by cutting at first, length is the tabular woven wire of 2.5cm, then this woven wire is placed in the grinding tool, striking out tooth depth is 2.0mm, and space width is the corrugated woven wire of 4.5mm;
The preparation of aluminum oxide coating layer
The first step, the preliminary treatment of stainless steel metal silk screen
30min in 5 tabulars that moulding is required and the hydrochloric acid solution of 6 corrugated woven wire immersion 50ml 0.1mol/L takes out the back deionized water rinsing, and then dry 8h under 100 ℃;
Second step, the preparation of electrodeposit liquid
With 0.5ml 2 * 10
-2Polyacrylic acid and the 3g/L aluminium isopropoxide ethanol solution of 1ml join in the absolute ethyl alcohol of continuous stirring, overall solution volume is 50ml, the concentration of polyacrylic acid and aluminium isopropoxide is respectively 61.044mg/L, 0.06g/L in the solution, add 2.0g aluminium oxide and 0.2g aluminium powder then, after continuing to stir 20min, sonic oscillation 40min;
The 3rd step, the electro deposition oxidation aluminized coating
With tabular or corrugated woven wire is negative electrode, dull and stereotyped corrosion resistant plate electrode is that anode carries out electro-deposition, deposition voltage is 5V, the deposition back dries up coating with compressed air, and the sample that will adhere to aluminium oxide then is at room temperature dry, and dried sample speed with 120 ℃/h in Muffle furnace is warming up to 500 ℃, insulation 3h, at last, reduce to room temperature, the aluminum oxide coating layer thickness that deposition makes is 20 μ m;
The 4th step, the moulding of Cellulated wiremesh carrier
With 6 corrugated woven wire and 5 tabular woven wires that adhere to aluminum oxide coating layer that adhere to aluminum oxide coating layer, according to the order of placing one deck tabular woven wire on one deck corrugated woven wire, alternately heap-shaped becomes cube structure, wrap up with the strip metal silk screen then, its joint is by the woven wire two ends as housing, and promptly interlaced the passing in strip metal silk screen termination and strip silk screen end limit forms.
Testing result: the aluminum oxide coating layer that electro-deposition obtains is thinner, and thickness is 20 μ m.The Cellulated wiremesh carrier volume of moulding assembling is 1.5 * 1.5 * 1.5cm
3
According to the method can be the aluminum oxide coating layer of 50 μ m at woven wire surface preparation thickness, and the Cellulated wiremesh carrier volume after the moulding can satisfy the requirement of the metallic carrier of vehicle exhaust converter and industrial middle and small scale reaction needed;
The preparation of implementing
With the order number is that 20 woven wire is cut to 2.5 * 3.5cm
2Woven wire be the tabular woven wire of forming Cellulated wiremesh carrier, it is wide that the corrugated woven wire then is of a size of 2.5cm by cutting at first, length is the tabular woven wire of 4.5cm, then this woven wire is placed in the homemade grinding tool, striking out tooth depth is 3.0mm, and space width is the corrugated woven wire of 5.0mm.
The first step, the preliminary treatment of stainless steel metal silk screen
30min in 11 tabulars that moulding is required and the hydrochloric acid solution of 12 corrugated woven wire immersion 100ml 0.1mol/L takes out the back deionized water rinsing, and then dry 6h under 110 ℃;
Second step, the preparation of electrodeposit liquid
The polyacrylic acid ethanolic solution of 1ml1.016g/L and the 3g/L aluminium isopropoxide ethanol solution of 3ml are joined in the absolute ethyl alcohol of continuous stirring, overall solution volume is 50ml, the concentration of polyacrylic acid and aluminium isopropoxide is respectively 2.035mg/L, 0.18g/L in the solution, add 2.0g aluminium oxide and 0.2g aluminium powder then, after continuing to stir 20min, sonic oscillation 40min;
The 3rd step, the electro deposition oxidation aluminized coating
With tabular or corrugated woven wire is negative electrode, dull and stereotyped corrosion resistant plate electrode is that anode carries out electro-deposition, deposition voltage is 10V, the deposition back dries up coating with compressed air, and the sample that will adhere to aluminium oxide then is at room temperature dry, and dried sample speed with 120 ℃/h in Muffle furnace is warming up to 800 ℃, insulation 2h, at last, reduce to room temperature, the aluminum oxide coating layer thickness that deposition makes is 50 μ m;
The 4th step, the moulding of Cellulated wiremesh carrier
With 12 corrugated woven wire and 11 tabular woven wires that adhere to aluminum oxide coating layer that adhere to aluminum oxide coating layer, according to the order of placing one deck tabular woven wire on one deck corrugated woven wire, alternately heap-shaped becomes cube structure, wraps up with the strip metal silk screen then; Its joint is by the woven wire two ends as housing, and promptly interlaced the passing in strip metal silk screen termination and strip silk screen end limit forms; Testing result: the aluminum oxide coating layer that electro-deposition obtains is thinner, and thickness is 50 μ m.The Cellulated wiremesh carrier volume of moulding assembling is 2.5 * 3.5 * 3.5cm
3
According to the method can be the aluminum oxide coating layer of 80 μ m at woven wire surface preparation thickness, and the Cellulated wiremesh carrier volume after the moulding is bigger, can satisfy the requirement of the metallic carrier of the large volume of needs in the industrial production.
The preparation of implementing
With the order number is that 5 woven wire is cut to 25.0 * 45.0cm
2Woven wire be the tabular woven wire of forming Cellulated wiremesh carrier, it is wide that the corrugated woven wire then is of a size of 25.0cm by cutting at first, length is the tabular woven wire of 40.0cm, then this woven wire is placed in the homemade grinding tool, striking out tooth depth is 4.0mm, and space width is the corrugated woven wire of 4.5mm;
The first step, the preliminary treatment of stainless steel metal silk screen
30min in 100 tabulars that moulding is required and the hydrochloric acid solution of 101 corrugated woven wire immersion 5L 0.1mol/L takes out the back deionized water rinsing, and then dry 5h under 120 ℃;
Second step, the preparation of electrodeposit liquid
The polyacrylic acid ethanolic solution of 5ml1.016g/L and the 3g/L aluminium isopropoxide ethanol solution of 0.5L are joined in the absolute ethyl alcohol of continuous stirring, overall solution volume is 2.5L, the concentration of polyacrylic acid and aluminium isopropoxide is respectively 2.035mg/L, 0.18g/L in the solution, add 100.0g aluminium oxide and 10g aluminium powder then, after continuing to stir 20min, sonic oscillation 40min;
The 3rd step, the electro deposition oxidation aluminized coating
With tabular or corrugated woven wire is negative electrode, dull and stereotyped corrosion resistant plate electrode is that anode carries out electro-deposition, deposition voltage is 100V, the deposition back dries up coating with compressed air, and the sample that will adhere to aluminium oxide then is at room temperature dry, and dried sample speed with 120 ℃/h in Muffle furnace is warming up to 800 ℃, insulation 3h, at last, reduce to room temperature, the aluminum oxide coating layer thickness that deposition makes is 80 μ m;
The 4th step, the moulding of Cellulated wiremesh carrier
With 101 corrugated woven wire and 100 tabular woven wires that adhere to aluminum oxide coating layer that adhere to aluminum oxide coating layer, according to the order of placing one deck tabular woven wire on one deck corrugated woven wire, alternately heap-shaped becomes cube structure, wraps up with the strip metal silk screen then.Its joint is by the woven wire two ends as housing, and promptly interlaced the passing in strip metal silk screen termination and strip silk screen end limit forms.Testing result: the aluminum oxide coating layer that electro-deposition obtains is thinner, and thickness is 80 μ m.The Cellulated wiremesh carrier volume of moulding assembling is 25 * 45 * 45cm
3
Claims (5)
1. the Cellulated wiremesh carrier with aluminum oxide coating layer comprises coating and metallic carrier, it is characterized in that:
A) Cellulated wiremesh carrier [6] is the alternate alternately accumulation with a plurality of corrugated woven wire [4] of a plurality of tabular woven wires [3] by the adhesion-tight aluminum oxide coating layer, by the moulding of strip metal silk screen [5] binding parcel;
B) Cellulated wiremesh carrier [6] inside is three-dimensional permeable structures, and the carrier framework material is the stainless steel metal silk screen, meshcount 5～40;
C) aluminum oxide coating layer on tabular woven wire [3] and corrugated woven wire [4] surface is with γ-Al
2O
3Powder is a deposition materials, and its deposit thickness is 20～80 μ m, and should finish before Cellulated wiremesh carrier [6] assembled formation.
2. a kind of Cellulated wiremesh carrier with aluminum oxide coating layer according to claim 1 is characterized in that: the corrugated woven wire tooth depth that constitutes Cellulated wiremesh carrier [6] is 2.0～4.0mm, and space width is 4.5～5.0mm.
3. a kind of Cellulated wiremesh carrier according to claim 1 with aluminum oxide coating layer, it is characterized in that: by the Cellulated wiremesh carrier [6] that the peaceful plate-shape metal silk screen of corrugated woven wire [4] [3] is constituted, the number of plies of its corrugated woven wire manys one deck than the tabular woven wire number of plies.
4. a kind of Cellulated wiremesh carrier with aluminum oxide coating layer according to claim 1 is characterized in that: the shape of Cellulated wiremesh carrier [6] and size are to determine according to the shape and size size of the inside reactor of reality use.
5. prepare a kind of method as claimed in claim 1, it is characterized in that preparation process is as follows with Cellulated wiremesh carrier of aluminum oxide coating layer:
The first step, the preliminary treatment of stainless steel metal silk screen
With 30min in the hydrochloric acid solution of tabular woven wire [3] and corrugated woven wire [4] immersion 0.1mol/L, take out the back and use deionized water rinsing, and then 100～120 ℃ of down dry 5～8h;
Second step, the preparation of electrodeposit liquid
In the absolute ethyl alcohol of continuous stirring, add the alcoholic solution of polyacrylic acid and aluminium isopropoxide, then add alumina powder and a spot of aluminium powder; Prescription is in the deposit fluid: polyacrylic acid is 0.204～61.044mg/L, and aluminium isopropoxide is 0.06～0.6g/L, and aluminium oxide is 40.0g/L, and aluminium powder is 4.0g/L, and is last, deposit fluid sonic oscillation 40min;
The 3rd step, the electro deposition oxidation aluminized coating
With the tabular woven wire [3] or the corrugated woven wire [4] that need deposited coatings is negative electrode, and stainless steel flat plate is an anode, and deposition voltage is 5～100V; After the electro-deposition, at room temperature dry, place Muffle furnace to rise to 500～800 ℃ then, insulation 2～3h with the programming rate of 120 ℃/h; At last, reduce to room temperature; The aluminum oxide coating layer thickness that deposition makes is 20～80 μ m;
The 4th step, the assembled formation of Cellulated wiremesh carrier
The a plurality of tabular woven wires [3] and a plurality of corrugated woven wire [4] that have deposited the oxidation aluminized coating are alternately piled up, and the number of plies that makes the corrugated woven wire manys one deck than the tabular woven wire number of plies, be housing binding parcel with strip metal silk screen [5] then, its shell joint place is by as the woven wire two ends of housing, and promptly strip metal silk screen termination [7] and strip silk screen end limit [8] are interlaced passes moulding.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20110100744A1 (en) * | 2008-05-07 | 2011-05-05 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Honeycomb body formed of metallic foils, method for the production thereof and motor vehicle |
| CN102166515A (en) * | 2011-03-01 | 2011-08-31 | 大连理工大学 | Honeycomb wire mesh catalyst for stationary source tail gas denitration and preparation thereof |
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2007
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| US8491846B2 (en) * | 2008-05-07 | 2013-07-23 | Emitec Gesellschaft Fuer Emissionstechnologie Mbh | Honeycomb body formed of metallic foils, method for the production thereof and motor vehicle |
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| CN102166515A (en) * | 2011-03-01 | 2011-08-31 | 大连理工大学 | Honeycomb wire mesh catalyst for stationary source tail gas denitration and preparation thereof |
| CN102166515B (en) * | 2011-03-01 | 2012-11-21 | 大连理工大学 | Honeycomb wire mesh catalyst for stationary source tail gas denitration and preparation thereof |
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| CN102784640B (en) * | 2011-05-20 | 2014-08-20 | 上海浦景化工技术有限公司 | Catalyst for synthesizing oxalate by CO coupling reaction and preparation method thereof |
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| CN102784640A (en) * | 2011-05-20 | 2012-11-21 | 上海浦景化工技术有限公司 | Catalyst for synthesizing oxalate by CO coupling reaction and preparation method thereof |
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| CN103736525A (en) * | 2013-12-27 | 2014-04-23 | 吉林省众鑫汽车装备有限公司 | Coating method of fiber connection layers of metal fiber carriers |
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| CN105215366A (en) * | 2015-09-30 | 2016-01-06 | 成都易态科技有限公司 | Prepare sintering method and the application thereof of porous film material |
| CN107779926A (en) * | 2016-08-31 | 2018-03-09 | 安平县亚荣星环保科技有限公司 | A kind of woven wire with aluminum oxide coating layer |
| CN108262013A (en) * | 2018-01-24 | 2018-07-10 | 清华大学 | Carbon nanotube adsorption component, preparation method and application |
| CN108262013B (en) * | 2018-01-24 | 2020-11-10 | 清华大学 | Carbon nanotube adsorption member, preparation method and application |
| CN109012715A (en) * | 2018-08-10 | 2018-12-18 | 青岛华世洁环保科技有限公司 | Low temperature vanadium titanium oxide catalytic module and preparation method thereof |
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| CN109500546A (en) * | 2018-11-08 | 2019-03-22 | 北京安达泰克科技有限公司 | The manufacturing method of aluminium honeycomb core |
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