CN105624759A - Ceramic membrane with capillary structure and super dehumidifying and wetting performance and preparation method thereof - Google Patents
Ceramic membrane with capillary structure and super dehumidifying and wetting performance and preparation method thereof Download PDFInfo
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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
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/12—Anodising more than once, e.g. in different baths
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/11—Making porous workpieces or articles
- B22F3/1103—Making porous workpieces or articles with particular physical characteristics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/11—Making porous workpieces or articles
- B22F3/1121—Making porous workpieces or articles by using decomposable, meltable or sublimatable fillers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/002—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature
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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
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
- C25D11/10—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing organic acids
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Abstract
The invention provides a ceramic membrane with a capillary structure and super dehumidifying and wetting performance. The thickness of the ceramic membrane ranges from 10 nm to 600 micrometers. The ceramic membrane comprises an aluminum compound substrate and a base membrane layer adhering to the substrate. The base membrane layer is an aluminum oxide ceramic layer. The ceramic membrane is a porous membrane with the average capillary radius of 0.1 mm to 1.2 mm, water drops with unit mass can be completely spread through the hydrophilic surface of the ceramic membrane, and a water membrane with the area not smaller than 300 cm<2>/g is formed. By means of the hydrophilic surface, water molecules can overcome self gravity, and the climbing height in the vertical direction is not smaller than 3.0 cm.
Description
Technical field
The present invention relates to the preparation method of a kind of ceramic membrane and application thereof, particularly relate to preparation and the application thereof of a kind of ceramic membrane with capillary structure and super infiltration suction performance.
Background technology
Surface wettability is an important feature of solid surface, usually characterizes the infiltration degree of liquid versus solid with contact angle. In general, when the contact angle of solid surface and water is greater than 90 ��, it is referred to as hydrophobic surface; When being less than 90 ��, it is referred to as water-wetted surface. In recent years, also it has been proposed that using 65 �� of contact angles as hydrophilic and hydrophobic boundary.
Due to the wetting property that liquid is good, water-wetted surface can be widely used in industry with life. Such as steam coagulation on hydrophilic surfaces time, easily expand into the water film of uniformly continous, suppressing the formation of isolated water droplet, can strengthen resistance to fogging and the transparency on surface, this is needing to prevent frosting and keep very important in the application of transparent (windshield glass etc. such as refrigerator inwall, automobile). In addition, the condenser cold scattering fin of air-conditioning operationally, can meet and cold condense between fin by the water vapour in air, forms the globule. This not only lowers the heat exchange area of fin and air, and also increase windage, seriously affect the refrigerating efficiency of air-conditioning. And on cold scattering fin, it is coated with water wetted material, the formation of globule when can prevent from condensing, reduce windage, maintain bigger heat interchanging area, thus improve the efficiency of air-conditioning.
Sol-gel method prepares one of inorganic hydrophilic coating main method, and reaction can carry out at a lower temperature, process easy-regulating, but the method is it is generally required to the modes such as UV-irradiation could obtain wetting ability. Electrochemical method (such as electrochemical deposition, anodic oxidation etc.) also can be used for preparing inorganic hydrophilic coating, but needs special plant and instrument, it is difficult to realizes the preparation of wide area surface. Organic hydrophilic coating adopts the method for coating to obtain, it is easy to realize scale operation, but the hydrophilicity of coating is stable not, it may also be useful to can disappear after certain time.
The hydrophilicity of above-mentioned water-wetted surface all characterizes with contact angle, and the contact angle the most often reported is mostly 0 30��Between. In current paper and patent, there is not yet a kind of water-wetted surface and there is capillary structure, it is possible to water (or other liquid) is produced super infiltration and suction function.
Summary of the invention
It is an object of the invention to solve the problem, it is proposed to a kind of there is capillary structure ceramic membrane and its preparation method and application.
The object of the present invention is achieved through the following technical solutions:
There is capillary structure and the ceramic membrane of super dehumidifier wetting property, described ceramic membrane thickness is 10nm��600 ��m, the base membrane layer that described ceramic membrane comprises an aluminum compound substrate, is attached in described substrate, described base membrane layer is alumina ceramic layer, described ceramic membrane is have the porous-film that average capillary radius is 0.1-1.2mm, described ceramic membrane water-wetted surface can make the water droplet of unit mass spread out completely, forms area and is not less than 300cm2The water film of/g; And water-wetted surface can make water molecules overcome self gravitation, the height of self climbing is not less than 3.0cm in the vertical direction.
Preferably, the preparation method of the described ceramic membrane with capillary structure, comprises the steps,
S1, substrate pretreatment
S11, substrate degreasing: base material is put into the sulfuric acid tank of 5%��20%, degreasing, take out after 3min��5min; Described base material is aluminium base or aluminum alloy base material;
S12, first time washing: repeatedly rinse aluminium base with tap water, ensure the PH value > 5 on aluminium base surface;
S13, alkali cleaning: the base material after first time washing is put into concentration is 45kg/m3��55kg/m3, temperature is in the sodium hydroxide solution of 40 DEG C��60 DEG C, alkali cleaning 4min��8min;
S14, second time washing: repeatedly rinse aluminium base with tap water, take out after rinsing 2min��4min;
S15, third time washing: repeatedly rinse aluminium base with tap water, rinse 2min��4min, take out after PH value > 5;
S16, anodic oxidation: clean oxidation sequentially with alkaline electrolyte and acid electrolyte, promote that metallic aluminium base material Surface Creation has hole height, the pellumina of high adsorption capacity, and described aluminum oxide film thickness is 0.3��30 ��m;
S17, the 4th washing: repeatedly rinsed by the pellumina tap water through anodic oxidation, rinse and take out after 2min��4min, then with deionized water rinsing 1min��2min;
S18, drying: take out the aluminium base after chemical oxidation, dry after deionized water rinses repeatedly;
S2, alumina ceramic layer coating step;
S21, raw material powder prepare; Carry out Alpha-alumina, organic pore former, sintering aid and other batch ingredients in proportion weighing proportioning: described Alpha-alumina mass percent is 60%-70%, particle diameter is 5-30 ��m, described organic pore former mass percent is 30%-40%, and particle diameter is 3-35 ��m; Described sintering aid mass percent is 10%-30%;
S22, raw material mix: after first Alpha-alumina, organic pore former being mixed, then mix with sintering aid and other batch ingredients: Alpha-alumina and organic pore former are 70-90%, described sintering aid and other batch ingredients is 10-30% mixing;
S23, mixed mill stir: add aluminium oxide ceramic ball or steel ball that 20-30 grain diameter is 5-12mm in mixed powder, mixed mill 1-3h on mixer;
S24, shaping: mixing raw material loads to carry out low-temperature prewarming in mould shaping, described preheating mold temperature is 180-250 DEG C;
S25, intermediate sintering temperature and one-tenth hole; Being proceeded in intermediate sintering temperature stove by product after shaping, be heated to 600 DEG C, the heat-up time of described middle temperature stove is 2-3h, and insulation 1-2h, then cools to less than 100 DEG C with the furnace, finally takes out last obtained porous ceramics from stove.
Preferably, the preparation method of the described ceramic membrane with capillary structure and super dehumidifier wetting property, in the anodization step of described S16, described electrolytic solution comprises acid electrolyte and alkaline electrolyte, and described acid electrolyte proportioning is: formic acid mass percent 20��40%; Oxalic acid mass percent 30��50%; Propanedioic acid mass percent 30��50%; Single nickel salt mass percent 0��10%, process parameter is: oxidation voltage is 20��80V, and current density is 2.0��3.5A/dm2, and the treatment time is 0.5��3h, and treatment temp is 10��25 DEG C;
Described alkaline electrolyte proportioning is: sodium carbonate mass percent 40��60%; Sodium chromate mass percent 15��25%; Sodium hydroxide mass percent 2��5%; Tertiary sodium phosphate mass percent 0��1.5%, process parameter is: oxidation voltage is 5��35V, and current density is 1.0��2.5A/dm2, and the treatment time is 5��60min, and treatment temp is 85��100 DEG C.
Preferably, adopting air circulating oven or flattening oven in described S24 low temperature moulding, described air circulating oven preheating mold temperature is 180-250 DEG C, and the low temperature moulding time is 8-12min; Described flattening oven preheating mold temperature is 180-250 DEG C, and the low temperature moulding time is 3-5min.
Preferably, the washing of the first time in described S12 flush time is 2min��4min.
Preferably, in described S21, other batch of materials are dispersion solvent.
Preferably, described mixer is the mixer of V-structure, and described batch mixing speed is 100-150r/min.
Ceramic membrane prepared by the present invention has super infiltration, and described super infiltration refers to that water-wetted surface can make the water droplet of unit mass spread out completely, forms area and is not less than 300cm2The water film of/g; And described ceramic membrane has suction function, described suction function refers to that water-wetted surface can make water molecules overcome self gravitation, and the height of self climbing is not less than 3.0cm in the vertical direction.
The resistance to TCT426 of speeding of ceramic membrane thermal conductivity of the present invention Germany records. Get the ceramic membrane of each 30cm of length and width and between hot line and thermopair insertion two panels sample, 2.0A heating current will be connected and start to test. Obtain the function to the time that heats up, thus show that the thermal conductivity of ceramic membrane is 1.0 30W/m.K, can up to 200W/m.K with the overall thermal conductivity rate of aluminium (or aluminum alloy substrate). Ceramic membrane working temperature is up to 600 DEG C, and voltage breakdown in dry conditions is up to DC5000V. This ceramic membrane has capillary structure, and its average capillary radius is 0.1 1.2mm, and liquid can be produced very strong capillary force, especially water can be produced super infiltration suction function.
Super immersional wetting of the present invention, refers at normal temperatures and pressures, and when a water, (volume is about 0.03cm3; Quality is about 0.03g) when dropping onto on the ceramic membrane that the present invention relates to (ceramic membrane is horizontal positioned), water droplet can not stable existence, but spontaneously spread drawout to surrounding, complete wetting ceramic membrane surface, formed the water film of continuous uniform on inherent ceramic membrane in several minutes, the contact area of water film and ceramic membrane surface can up to 40cm2, that is, the contact area of water film and air can up to 40cm2. Generally, the water droplet of unit mass spreads out on ceramic membrane and is formed after water film, and the thickness of water film is the thinnest reaches 7.5 ��m/g, and the contact area of itself and air is at 300 1333cm2Between/g. Other liquid is also had similar super immersional wetting by ceramic membrane.
The super suction function of ceramic membrane of the present invention, refers at normal temperatures and pressures, when ceramic membrane is dipped vertically in water, due to the suction function of ceramic membrane kapillary, water can overcome the gravity of self, upwards climbs along ceramic membrane, and climb altitude is generally higher than liquid level 3.0-12.0cm. Other liquid is also had similar super suction function by ceramic membrane.
The useful effect of the present invention is mainly reflected in: the method that the present invention utilizes electrochemical oxidation and slurry coating to combine has prepared the ceramic membrane with capillary structure on aluminium (or aluminium alloy) surface, this ceramic membrane good heat conductivity, thermostability height, especially has super infiltration and suction function to water (waiting liquid). The characteristic of the existing water wetted material of these action opens and function, and open new Application Areas for water wetted material, such as the heat conduction and heat radiation etc. of refrigeration cool-down, sea water desaltination and electronic devices and components.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, technical solution of the present invention is described further:
Fig. 1: based on the refrigerator structure iron of ceramic membrane, now hidden the fin of refrigerator.
Embodiment
In the present invention, except ceramic membrane can be prepared in aluminium (or aluminium alloy) planar substrates of the shapes such as paper tinsel, sheet, plate, it is possible to preparing ceramic membrane on the nonplanar structures such as aluminium (or aluminium alloy) silk thread, ceramic membrane is applied to various occasion. Shape for substrate there is no particular restriction.
Due to the super infiltration function of ceramic membrane, water droplet forms the film of water and the contact area of air up to 300 1333cm on ceramic membrane2/ g, namely the heat exchange area of water film and ceramic membrane and air is big, and therefore water film is easy to turn into gas from environment heat absorption evaporation from liquid. Simultaneously due to the thickness of water film very thin (the thinnest reach 7.5 ��m/g), little in the thermograde of thickness direction, this is conducive to quick heat absorption and the rapid evaporation of water film. Moreover, ceramic membrane has good heat conductivility, and after water heat absorption evaporation, the temperature rapid reduction of ceramic membrane and aluminium (or aluminium alloy) substrate, therefore first ceramic membrane can be applied to refrigeration cool-down. It is save energy that ceramic membrane is used for the advantage of refrigeration cool-down, efficiency height and simple and convenient.
The super wetting property of water is tested by ceramic membrane
What prepare that width is about 10.0cm take aluminium foil as the ceramic membrane of substrate, and when dripping water with dropper on ceramic membrane, (quality is about 0.03g, and volume is about 0.03cm3), water droplet can not stable existence, but spread out in 1s and form diameter and be about the water film of 2.0cm. This water film continues diffusion, and after having crossed 32s, diameter has increased to 5.2cm. When above-mentioned water film continues diffusion, after 60s, diameter has increased to 6.3cm. Now the contact area of liquid film and ceramic membrane is about 30.2cm2, corresponding unit mass contact area is 996.6cm2/ g, unit mass water film thickness is 10.0 ��m/g.
Ceramic membrane capillary radius calculates
Being 20cm by a length of a film, wide be dipped vertically in water 2cm for 5cm ceramic membrane, length direction keeps vertical with the water surface, has the ceramic membrane of 18cm higher than the water surface, and thus observation water is along the suction phenomenon of ceramic membrane surface. After 60min, it has been found that water suction of falling in the vertical direction is highly h=12cm. According to formulaCalculating the mean radius r of ceramic membrane inner capillary tube, in described formula, ��=72.8mN/m is the coefficient of surface tension of water;=20��For the contact angle of liquid level in kapillary; ��=1000kg/m3For the density of water; G=9.8m/s2For universal gravity constant, obtain r=0.1mm.
Adopt aforesaid method that different thickness prepared in the present invention, not congruent ceramic membrane are carried out survey calculation, obtain capillary radius between 0.1 1.2mm.
Water film evaporation Performance comparision on ceramic membrane
Forming very thin water film owing to water droplet can spread out completely on ceramic membrane, the contact area of water film and air is at 300 1333cm2Between/g, therefore relative to the water droplet of equal quality, the velocity of evaporation of water film significantly improves. When identical environment wind speed 1.0m/s and ambient relative humidity 65%, measure water and evaporate required time at different temperatures.
Table 1 compares 1 and drips (about 0.03g) at 10 �� 10cm2On ceramic membrane (sample #1) and at 10 �� 10cm2On aluminium foil, (sample #2) evaporates the required time temperature of ceramic membrane surface and aluminium foil surface (the described temperature refer to) completely.
As seen from the data in Table 1, in the temperature range of 20 90 DEG C, the velocity of evaporation of water film is more than 10 times of water-drop evaporation speed. Especially at 20 DEG C, water film only needs 4 5min to evaporate completely, and water droplet then at least needs more than 60min could evaporate completely.
Table 1:
When identical ambient relative humidity 65%, measure water and evaporate required time at different environment wind speed, different surfaces temperature.
Table 2 compares 1 and drips (about 0.03g) at 10 �� 10cm2On ceramic membrane (sample #1) and at 10 �� 10cm2On aluminium foil, (sample #2) evaporates the required time temperature of ceramic membrane surface and aluminium foil surface (the described temperature refer to) completely.
Table 2:
The application one of ceramic membrane:
As shown in Figure 1, for the refrigerator structure iron based on ceramic membrane, described refrigeration principle is that the inwall in metal (aluminium, copper, stainless steel etc.) vacuum-evaporation chamber 1 has ceramic membrane, after appropriate water controls to enter evaporation cavity 1 by water inlet pipe 3 by magnetic valve 2, water film is formed rapidly on ceramic membrane, the contact surface of water film and vacuum is very big, and evaporation turns into gas very soon under vacuum conditions, is extracted out evaporation cavity from escape pipe 4 by water and gas dual-purpose pump 5 and arrives the case 6 that catchments. Then water droplet is inputted by water inlet pipe 3 again, repeats the process that water film is formed, evaporates, discharges, so move in circles in evaporation cavity, and the cycle of circulation is controlled by the open and close of magnetic valve. Absorbing heat in a large number from environment during water film evaporation, such as the evaporation of 1.0g water to be absorbed the heat being greater than 2000J, is absorbed heat and the aluminium sheet of 100g can be made to lower the temperature 10 DEG C. Therefore the rapid evaporation of water film makes the temperature on evaporation cavity surface obviously decline, and this cooling effect is delivered in ambient air by fin again, thus arrives the refrigeration reducing envrionment temperature.
Specifically, an obtained aluminium evaporation cavity, inside cavity volume is 12cm �� 6cm �� 2cm, when water film evaporates under the vacuum tightness that the highest negative pressure is 80KPa, create obvious absorbing and cooling temperature effect: in 2 3min, chamber outer surface temperature is by original 25 DEG C of rapid reduction to 14 DEG C, and cooling extent is greater than 10 DEG C.
In above-mentioned process of refrigeration, ceramic membrane serves keying action: the first, and the water film formed on ceramic membrane, its thickness can be thinned to 10 ��m, this reduces the thermograde of water film at thickness direction so that it is evaporation of can absorbing heat fast. If water film thickness is excessive, due to the thermal conductivity very little (being about 0.6W/m.K when 20 DEG C) of water, thickness direction thermograde can very big, heat trnasfer can be very slow, thus affect the heat absorption velocity of evaporation of water. 2nd, the mean coefficient of heat conductivity rate of ceramic membrane and aluminium (or aluminium alloy) substrate is up to 200W/m.K, good thermal conductivity ensure that water film from the heat absorption fast of evaporation cavity surface, can make the temperature of chamber outer surface and connected fin obviously decline, reach the object of refrigeration.
The application two of ceramic membrane
Sea water desaltination principle based on ceramic membrane is very similar with refrigerator Principles and methods to device, it is that preparation has ceramic membrane on the inwall of a vacuum cavity equally, by aqueduct, appropriate seawater is introduced vacuum cavity, seawater infiltrates on ceramic membrane after entering cavity and spreads out, with contact area maximumization of vacuum. Simultaneously due to the vacuum tightness in cavity, the moisture in seawater is evaporated to rapidly water vapour, pumps to via water and gas dual-purpose vacuum pump and the catchmenting in case of fresh water is housed in advance. Due to the very thin thickness of water film formed on ceramic membrane, water film just can evaporate rapidly in normal temperature (20 30 DEG C) under vacuum conditions, without the need to extra heat temperature raising, and water film evaporation is not high to the requirement of vacuum tightness yet, and the vacuum tightness that negative pressure is 80KPa can maintain evaporation fast and fresh water collection. Therefore, the advantage of the desalination technology of application ceramic membrane is: energy-conserving and environment-protective, and structure device is simple, is convenient to safeguard, cost is low, can clean Posterior circle with the ceramic membrane crossed and utilize, the fresh water purity height obtained. In this desalination technology, the evaporation of seawater just can carry out at normal temperature, neither needs expensive reverse osmosis membrane, does not also need to expend too many electric energy and heating of seawater is evaporated to boiling point.
The application three of ceramic membrane
Ceramic membrane needs the electrical insulating property of ceramic membrane existing excellence when being used as the heat conduction and heat radiation film of electronic product, keeps again good thermal conductivity, therefore needs to be processed accordingly by ceramic membrane, described process comprise the steps: first by ceramic membrane at water glass (Na2SiO3��9H2O) solution floods 20 40min, after taking out, spend heating, drying 20 40min at 100 DEG C. Then ceramic membrane is flooded in heat-conducting resin solution 20 40min, takes out and spend heating, drying 60min at 80 DEG C. Above treatment step is sealed by the kapillary in ceramic membrane, enhances electrical insulation capability and the heat conductivility of ceramic membrane, and the ceramic membrane in the present invention is a kind of novel heat conduction and heat radiation material, can meet all kinds of electrical element to the harsh requirement of heat radiation.
The present invention still has multiple enforcement mode specifically, and all employings are equal to replacement or equivalent transformation and all technical schemes of being formed, all drop within the scope of protection of present invention.
Claims (7)
1. there is capillary structure and the ceramic membrane of super dehumidifier wetting property, it is characterized in that: described ceramic membrane thickness is 10nm��600 ��m, the base membrane layer that described ceramic membrane comprises an aluminum compound substrate, is attached in described substrate, described base membrane layer is alumina ceramic layer, described ceramic membrane is have the porous-film that average capillary radius is 0.1-1.2mm, described ceramic membrane water-wetted surface can make the water droplet of unit mass spread out completely, forms area and is not less than 300cm2The water film of/g; And water-wetted surface can make water molecules overcome self gravitation, the height of self climbing is not less than 3.0cm in the vertical direction.
2. the preparation method of the ceramic membrane with capillary structure according to claim 1, it is characterised in that: comprise the steps,
S1, substrate pretreatment
S11, substrate degreasing: base material is put into the sulfuric acid tank of 5%��20%, degreasing, take out after 3min��5min; Described base material is aluminium base or aluminum alloy base material;
S12, first time washing: repeatedly rinse aluminium base with tap water, ensure the PH value > 5 on aluminium base surface;
S13, alkali cleaning: the base material after first time washing is put into concentration is 45kg/m3��55kg/m3, temperature is in the sodium hydroxide solution of 40 DEG C��60 DEG C, alkali cleaning 4min��8min;
S14, second time washing: repeatedly rinse aluminium base with tap water, take out after rinsing 2min��4min;
S15, third time washing: repeatedly rinse aluminium base with tap water, rinse 2min��4min, take out after PH value > 5;
S16, anodic oxidation: clean oxidation sequentially with alkaline electrolyte and acid electrolyte, promote that metallic aluminium base material Surface Creation has hole height, the pellumina of high adsorption capacity, and described aluminum oxide film thickness is 0.3��30 ��m;
S17, the 4th washing: repeatedly rinsed by the pellumina tap water through anodic oxidation, rinse and take out after 2min��4min, then with deionized water rinsing 1min��2min;
S18, drying: take out the aluminium base after chemical oxidation, dry after deionized water rinses repeatedly;
S2, alumina ceramic layer coating step;
S21, raw material powder prepare; Carry out Alpha-alumina, organic pore former, sintering aid and other batch ingredients in proportion weighing proportioning: described Alpha-alumina mass percent is 60%-70%, particle diameter is 5-30 ��m, described organic pore former mass percent is 30%-40%, and particle diameter is 3-35 ��m; Described sintering aid mass percent is 10%-30%;
S22, raw material mix: after first Alpha-alumina, organic pore former being mixed, then mix with sintering aid and other batch ingredients: Alpha-alumina and organic pore former are 70-90%, described sintering aid and other batch ingredients is 10-30% mixing;
S23, mixed mill stir: add aluminium oxide ceramic ball or steel ball that 20-30 grain diameter is 5-12mm in mixed powder, mixed mill 1-3h on mixer;
S24, shaping: mixing raw material loads to carry out low-temperature prewarming in mould shaping, described preheating mold temperature is 180-250 DEG C;
S25, intermediate sintering temperature and one-tenth hole; Being proceeded in intermediate sintering temperature stove by product after shaping, be heated to 600 DEG C, the heat-up time of described middle temperature stove is 2-3h, and insulation 1-2h, then cools to less than 100 DEG C with the furnace, finally takes out last obtained porous ceramics from stove.
3. the preparation method of the ceramic membrane with capillary structure and super dehumidifier wetting property according to claim 1, it is characterized in that: in the anodization step of described S16, described electrolytic solution comprises acid electrolyte and alkaline electrolyte, and described acid electrolyte proportioning is: formic acid mass percent 20��40%; Oxalic acid mass percent 30��50%; Propanedioic acid mass percent 30��50%; Single nickel salt mass percent 0��10%, process parameter is: oxidation voltage is 20��80V, and current density is 2.0��3.5A/dm2, and the treatment time is 0.5��3h, and treatment temp is 10��25 DEG C;
Described alkaline electrolyte proportioning is: sodium carbonate mass percent 40��60%; Sodium chromate mass percent 15��25%; Sodium hydroxide mass percent 2��5%; Tertiary sodium phosphate mass percent 0��1.5%, process parameter is: oxidation voltage is 5��35V, and current density is 1.0��2.5A/dm2, and the treatment time is 5��60min, and treatment temp is 85��100 DEG C.
4. the preparation method of the ceramic membrane with capillary structure and super dehumidifier wetting property according to claim 1, it is characterized in that: described S24 low temperature moulding adopts air circulating oven or flattening oven, described air circulating oven preheating mold temperature is 180-250 DEG C, and the low temperature moulding time is 8-12min; Described flattening oven preheating mold temperature is 180-250 DEG C, and the low temperature moulding time is 3-5min.
5. the preparation method of the ceramic membrane with capillary structure and super dehumidifier wetting property according to claim 1, it is characterised in that: the first time washing flush time in described S12 is 2min��4min.
6. the preparation method of the ceramic membrane with capillary structure and super dehumidifier wetting property according to claim 1, it is characterised in that: in described S21, other batch of materials are dispersion solvent.
7. the preparation method of the ceramic membrane with capillary structure and super dehumidifier wetting property according to claim 1, it is characterised in that: described mixer is the mixer of V-structure, and described batch mixing speed is 100-150r/min.
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