CN204208381U - Sinter inorganic porous filter element and manufacture the polissoir of this filter element - Google Patents
Sinter inorganic porous filter element and manufacture the polissoir of this filter element Download PDFInfo
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- CN204208381U CN204208381U CN201420574309.7U CN201420574309U CN204208381U CN 204208381 U CN204208381 U CN 204208381U CN 201420574309 U CN201420574309 U CN 201420574309U CN 204208381 U CN204208381 U CN 204208381U
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Abstract
The utility model discloses a kind of inorganic porous filter element of sintering that dust is not easily assembled at filtering surface when gas filtration and manufacture the polissoir of this filter element.This filter element comprises the filter element body be made up of sintered inorganic material, and the surface of filter element body is filtering surface, and wherein, described filtering surface is burnishing surface, and the surface roughness of this burnishing surface is Ra3.2 ~ 25 μm.Described burnishing surface can effectively prevent from this burnishing surface, assembling dust during gas filtration.Polissoir comprises centerless external cylindrical polishing mechanism, and this centerless external cylindrical polishing mechanism comprises polishing wheel, guide wheel and supporting plate; Outer dust box, centerless external cylindrical polishing mechanism is positioned in this outer dust box, outer dust box has the charging aperture corresponding with supporting plate entrance side and the discharging opening corresponding with supporting plate outlet side; And dust exhaust apparatus, dust exhaust apparatus is connected with outer dust box by dust sucting pipeline.This polissoir not only can realize fast polishing, and can prevent dust from spreading.
Description
Technical field
The utility model relates to filter element, is specifically related to sinter inorganic porous filter element and preparation technology thereof.
Background technology
Sinter inorganic porous filter element and be generally divided into sintering metal porous filter elements and the large class of sintered ceramic porous filter elements two.In addition, along with technological progress also creates compounds filter element and sintering metal ceramic-like filter element between the sintering metal having metal and pottery premium properties separately concurrently, they are included into sintering metal porous filter elements one class by the utility model for the time being.
It is generally prepared by powder metallurgic method that above-mentioned these sinter inorganic porous filter element.Given shape (mainly tubulose or sheet) is become by ready powder pressing, and then obtained after sintering and cool.The filter element that this method obtains is substantially uniform porous body, contradiction is there is in it in filtering accuracy and filtration permeability, wherein the lifting of performance will cause the decline of performance on the other hand on the one hand, so be not easy to reach very good level simultaneously.
Thereby produce the inorganic porous filter element of asymmetric sintering.Its preparation utilizes the similar approach first obtained carrier be made up of sintering diamond bit or sintered ceramic porous material, and then at carrier surface coat film liquid (film powder being added in dispersant obtained), after this again double sintering is carried out to the carrier of coat film liquid, make film liquid form the porous material rete of very thin thickness.Wherein, by the isoparametric control of granularity to carrier powder and film powder, make the aperture of carrier obviously be greater than rete aperture, so just both ensure that filtering accuracy, and turn improved the permeability of filter element.
The problem found for the inorganic porous filter element of above-mentioned sintering at present has: for the inorganic porous filter element of asymmetric sintering, being mainly (1) rete can come off from carrier, and adhesive force needs to be strengthened further between the two; (2) thickness of rete is not easy accurate control, and consistency of thickness is bad; (3) easily assemble dust for film surface during gas filtration (filtering surface), cause cleaning cycle to shorten; (4) complicated process of preparation, the long flow path of filter element, production cost is higher.When gas filtration is mainly for the common sintering without rete inorganic porous filter element, filtering surface easily assembles dust.
Utility model content
Technical problem to be solved in the utility model comprises: first provide one to contribute to improving adhesive force, thicknesses of layers uniform, controllable between rete and carrier, and the preparation technology of the inorganic porous filter element of asymmetric sintering that dust is not easily assembled at film surface when gas filtration and this filter element.Secondly, a kind of contributing to be provided to improve the inorganic porous filter element of asymmetric sintering of adhesive force and the preparation technology of this filter element between rete and carrier.Further, a kind of thicknesses of layers will be provided controlled, and when gas filtration dust not easily film surface assemble the inorganic porous filter element of asymmetric sintering.Further, also to provide a kind of when gas filtration dust not easily filtering surface assemble the inorganic porous filter element of sintering.Further, provide a kind of preparation flow obviously to shorten, the preparation technology of the inorganic porous filter element of asymmetric sintering of production cost can be reduced.
For solving above-mentioned first technical problem, the inorganic porous filter element of asymmetric sintering comprises the carrier that is made up of the sintering diamond bit of larger aperture or sintered ceramic porous material and is attached to the rete formed on described carrier and by sintering diamond bit or the sintered ceramic porous material of smaller aperture due, wherein, described carrier is the first burnishing surface for adhering to the surface of this rete, and the surface roughness of the first burnishing surface is Ra6.3 ~ 25 μm; The opposite side surface (i.e. filtering surface) described rete being attached to a side surface on carrier with this rete contrary is the second burnishing surface, and the surface roughness of the second burnishing surface is Ra0.8 ~ 12.5 μm.Surface for adhering to this rete on carrier is hair side before non-polishing, it is formed with oxide layer, and after causing adhering to rete, both adhesive force declines.Make carrier becomes the first burnishing surface for the surface adhering to rete by polishing, except oxide layer, the adhesive force of carrier and rete can be improved thus.After carrier forms rete, again polishing is carried out to film surface (i.e. filtering surface) and form the second burnishing surface, both thicknesses of layers was controlled, thicknesses of layers can be made again very even, in addition, also can effectively prevent from the second burnishing surface, assembling dust during gas filtration.The surface roughness of the first burnishing surface should not be less than Ra6.3 μm, otherwise the average pore size of the micropore be distributed on the first burnishing surface can be made to diminish, thus significantly improves the osmotic resistance of carrier itself; The surface roughness of the first burnishing surface also should not be greater than Ra25 μm, otherwise carries out having little significance of polishing to carrier surface.The surface roughness of the second burnishing surface should not be less than Ra0.8 μm, otherwise both can increase polishing difficulty, also greatly can increase the osmotic resistance of rete simultaneously; The surface roughness of the second burnishing surface should not be less than Ra12.5 μm, otherwise reduces its dust protection assembly effect.
In above-mentioned asymmetric sintering inorganic porous material filter element, the surface roughness of described first burnishing surface is preferably Ra12.5 ~ 25 μm; The surface roughness of the second burnishing surface is preferably Ra1.6 ~ 12.5 μm.The surface roughness of the second burnishing surface also can more preferably Ra3.2 ~ 6.3 μm.When the surface roughness of the first burnishing surface is Ra12.5 ~ 25 μm, both can ensure the permeability that carrier itself is good, the good adhesion between rete and carrier can have been ensured again.The surface roughness of the second burnishing surface is Ra3.2 ~ 6.3 μm, be not only easy to processing, dust protection assembles excellent effect, and rete permeability is also very desirable.
In above-mentioned asymmetric sintering inorganic porous material filter element, the average thickness of described rete is preferably set to 0.1 ~ 0.6mm, then can make under the first burnishing surface and the second burnishing surface acting in conjunction the deviation of its thickness be not more than ± 50 μm.Now, because thicknesses of layers is very thin and consistent, the strainability of asymmetric sintering inorganic porous material filter element is improved further.
In above-mentioned asymmetric sintering inorganic porous material filter element, described carrier and rete preferably have the sintering diamond bit of compatibility by same kind or sintered ceramic porous material is formed.Such as when carrier is cemented iron Al intermetallic porous material, rete is all the sintered iron base porous material that cemented iron Al intermetallic porous material or other and carrier have compatibility.Like this, can guarantee between carrier and rete not because material cause departs from.
Above-mentioned asymmetric sintering inorganic porous material filter element is generally tubulose, and described rete is positioned at the outer tube surface of this filter element.Certainly, filter element also may be sheet or other shapes; From filtering direction, rete then may be positioned at outside filter element (i.e. thing to be filtered from filter element externally to its self-filtering) also may be positioned at inside filter element (namely thing to be filtered outsidely to filter from the inside of filter element to it).
The step of the preparation technology of above-mentioned asymmetric sintering inorganic porous material filter element comprises: 1) prepare carrier, then carry out polishing to form the first burnishing surface on carrier for the surface adhering to rete, the surface roughness of described first burnishing surface is Ra6.3 ~ 25 μm; 2) prepare film liquid, then described film liquid is attached to carrier side, after suitable drying, the carrier of coherent film liquid is sintered, make the film liquid after sintering form rete; 3) carry out polishing to form the second burnishing surface to the surface of described rete, the surface roughness of described second burnishing surface is Ra0.8 ~ 12.5 μm.
For solving above-mentioned second technical problem, the inorganic porous filter element of asymmetric sintering comprises the carrier that is made up of the sintering diamond bit of larger aperture or sintered ceramic porous material and is attached to the rete formed on described carrier and by sintering diamond bit or the sintered ceramic porous material of smaller aperture due, wherein, described carrier is burnishing surface for adhering to the surface of this rete, and the surface roughness of this burnishing surface is Ra6.3 ~ 25 μm.Surface for adhering to this rete on carrier is hair side before non-polishing, it is formed with oxide layer, and after causing adhering to rete, both adhesive force declines.Make carrier becomes burnishing surface for the surface adhering to rete by polishing, except oxide layer, improve the adhesive force of carrier and rete thus.The surface roughness of this burnishing surface should not be less than Ra6.3 μm, otherwise the average pore size of the micropore be distributed on burnishing surface can be made to diminish, thus significantly improves the osmotic resistance of carrier; The surface roughness of this burnishing surface also should not be greater than Ra25 μm, otherwise carries out having little significance of polishing to carrier surface.
In above-mentioned asymmetric sintering inorganic porous material filter element, the surface roughness of described burnishing surface is preferably Ra12.5 ~ 25 μm.So both can ensure the permeability that carrier itself is good, the good adhesion between rete and carrier can have been ensured again.
The preparation technology of above-mentioned asymmetric sintering inorganic porous material filter element, its step comprises: 1) prepare carrier, then carry out polishing to form burnishing surface on carrier for the surface adhering to rete, the surface roughness of described burnishing surface is Ra6.3 ~ 25 μm; 2) prepare film liquid, then described film liquid is attached to carrier surface, after suitable drying, the carrier of coherent film liquid is sintered, make the film liquid after sintering form rete.
For solving above-mentioned 3rd technical problem, the inorganic porous filter element of asymmetric sintering comprises the carrier that is made up of the sintering diamond bit of larger aperture or sintered ceramic porous material and is attached to the rete formed on described carrier and by sintering diamond bit or the sintered ceramic porous material of smaller aperture due, wherein, described rete outer surface is burnishing surface, and the surface roughness of this burnishing surface is Ra0.8 ~ 12.5 μm.The average thickness of described rete is preferably 0.1 ~ 0.6mm.After carrier forms rete, then polishing formation burnishing surface is carried out to film surface, both thicknesses of layers was controlled, and also can effectively prevent from this burnishing surface, assembling dust during gas filtration simultaneously.The surface roughness of described burnishing surface should not be less than Ra0.8 μm, otherwise can increase polishing difficulty, also greatly can increase the osmotic resistance of rete; The surface roughness of described burnishing surface should not be less than Ra12.5 μm, otherwise will reduce dust protection assembly effect.
In above-mentioned asymmetric sintering inorganic porous material filter element, the surface roughness of described burnishing surface is preferably Ra1.6 ~ 12.5 μm.In addition, the surface roughness of this burnishing surface also can more preferably Ra3.2 ~ 6.3 μm.The surface roughness of burnishing surface is designed to Ra3.2 ~ 6.3 μm, is not only easy to processing, dust protection assembles excellent effect, and rete permeability is also very good.
In above-mentioned asymmetric sintering inorganic porous material filter element, described carrier and rete preferably have the sintering diamond bit of compatibility by same kind or sintered ceramic porous material is formed.Such as when carrier is sintered titanium Al intermetallic porous material, rete is all the sintered titanium based porous materials that sintered titanium Al intermetallic porous material or other and carrier have compatibility.
Above-mentioned asymmetric sintering inorganic porous material filter element is generally tubulose, and described rete is positioned at the outer tube surface of this filter element.Certainly, filter element also may be sheet or other shapes; From filtering direction, rete then may be positioned at outside filter element (i.e. thing to be filtered from filter element externally to its self-filtering) also may be positioned at inside filter element (namely thing to be filtered outsidely to filter from the inside of filter element to it).
For solving above-mentioned 4th technical problem, sinter inorganic porous filter element and comprise the filter element body be made up of sintered inorganic material, the surface of filter element body is filtering surface, wherein, described filtering surface is burnishing surface, and the surface roughness of this burnishing surface is Ra3.2 ~ 25 μm.Described burnishing surface can effectively prevent from this burnishing surface, assembling dust during gas filtration.The surface roughness of this burnishing surface should not be less than Ra3.2 μm (because this filtering surface has certain filtering accuracy requirement, first burnishing surface of therefore comparing above-mentioned carrier improves the upper limit requirement of surface roughness), otherwise the osmotic resistance of filtering surface is very large; The surface roughness of described burnishing surface should not be greater than Ra25 μm, otherwise is preventing the effect of burnishing surface being assembled dust not obvious.
In the inorganic porous filter element of above-mentioned sintering, surface roughness more preferably Ra6.3 ~ 12.5 μm of described burnishing surface.Dust protection now assembles excellent effect, and filtering surface with filtering accuracy and permeability all more satisfactory.In addition, described filter element body is specifically made up of sintering diamond bit or sintered ceramic porous material.
In the inorganic porous filter element of above-mentioned sintering, filter element body is generally tubulose, and its filtering surface is positioned at the outer tube surface of this filter element body.Certainly, filter element also may be sheet or other shapes; From filtering direction, filtering surface also may be positioned at (namely thing to be filtered is from the inside of filter element to its outside filtration) inside filter element.
Outer tube surface for ease of sintering inorganic porous filter element to above described tubular carries out polishing, a kind of polissoir of specialized designs, and comprising: centerless external cylindrical polishing mechanism, this centerless external cylindrical polishing mechanism comprises polishing wheel, guide wheel and supporting plate; Outer dust box, centerless external cylindrical polishing mechanism is positioned in this outer dust box, outer dust box has the charging aperture corresponding with supporting plate entrance side and the discharging opening corresponding with supporting plate outlet side; And dust exhaust apparatus, dust exhaust apparatus is connected with outer dust box by dust sucting pipeline.This polissoir not only can realize fast polishing, and can prevent dust from spreading, and prevents factory building environment pollution.
For solving above-mentioned 5th technical problem, the preparation technology of the inorganic porous filter element of asymmetric sintering, the inorganic porous filter element of described asymmetric sintering comprises the carrier that is made up of the sintering diamond bit of larger aperture or sintered ceramic porous material and is attached to the rete formed on described carrier and by sintering diamond bit or the sintered ceramic porous material of smaller aperture due, its step comprises: 1) prepare carrier powder, is then pressed into the pre-molding base of definite shape with carrier powder; 2) prepare film powder, film powder is added obtained film liquid in dispersant solution; 3) described film liquid is attached to the surface of pre-molding base, sinters after suitable drying to the pre-molding base of coherent film liquid, make the preformed pressed compact after sintering form carrier, film liquid forms rete.Above-mentioned technique is not obtain rete carry out overlay film and double sintering again on the basis sintering obtained carrier in advance after, but direct overlay film simultaneously obtain carrier and rete after sintering on pre-molding base, therefore sintering number reduces to once by original twice, greatly reduce the production costs such as energy consumption cost, cost of labor and depreciation of equipment, and shorten the manufacturing cycle of the inorganic porous filter element of asymmetric sintering, improve production efficiency.
Due to reasons such as rete are thinner, its desirable sintering time should be shorter than the sintering time of carrier.Therefore, when after the above-mentioned new technology of employing, due to for once sintered, the sintering time of rete is identical with the sintering time of carrier, at this moment, will easily cause carrier sintering insufficient if carry out sintering by the sintering time of rete, affect the performances such as the intensity of filter element, and if carry out sintering by the sintering time of carrier and easily will cause rete burning, so that film densification, the aperture of very big reduction rete, thus affect strainability.For solving this contradiction, advise improving the granularity of powder and sintering by the sintering time of carrier.Specifically, the granularity selection of carrier powder is-50 order ~+400 orders, the granularity selection of film powder is (1.5 ~ 3) × (-400 order ~ 15 μm), after sintering by the sintering time of carrier, the average pore size of described carrier is 20 μm ~ 100 μm, the average pore size of rete is 10 μm ~ 30 μm, is applicable to carrying out gas filtration; The granularity selection of carrier powder is-200 order ~+400 orders, the granularity selection of film powder is (1.5 ~ 3) × (3 μm ~ 15 μm), after sintering by the sintering time of carrier, when the average pore size of described carrier is 10 μm ~ 20 μm, the average pore size of rete is 1 μm ~ 8 μm, is applicable to carrying out liquid filtering.By above-mentioned improvement, even if sinter by the sintering time of carrier, also rete strainability can be protected.
As the further improvement to above-mentioned asymmetric sintering inorganic porous filter element preparation technology, when preparing carrier powder, shape, the first powder varied in size and the second powder are used to the basic material powder in carrier powder, described first powder compare the second powder granularity less and shaping time briquettability better, and the first powder accounts for 10 ~ 90% of this basic material powder gross mass.Due to the first powder, to have briquettability better, the feature (because the first powder granularity is less) that sintering back aperture is less, and the second powder has the larger feature (because the second powder granularity is larger) of sintering back aperture, after above-mentioned first powder is fully mixed with the second powder, first powder can be filled in the space formed between the second powder, playing on the one hand the effect controlling carrier aperture (can the ratio of aperture adjustment first powder as required, such as 30%, 50%, 70%), improve the briquettability of mixed powder on the one hand, formed body rhegma probability during reduction pressure forming, in addition, first powder granularity increases the overall activity of basic material powder compared with I, thus reduction sintering temperature, promote flowing and the growth of crystal grain in Powder during Sintering Process, and also prevent the sintering densification problem of rete further due to the decline of carrier sintering temperature.The above-mentioned technological means to the use of basic material powder shape, the first powder varied in size and the second powder in carrier powder also can adopt in the preparation process of other filter elements of the present utility model.
As to the preferred concrete mode of the one of above-mentioned asymmetric sintering inorganic porous filter element preparation technology be: described first powder is strip, described second powder is spherical or near-spherical, and described first powder is 1:(1.2 ~ 5 with the ratio of the granularity of the second powder).Briquettability better feature when wherein namely the first powder of strip has shaping, and the accumulation space of the second powder of spherical or near-spherical is comparatively large, sintering porosity is higher; First powder and the ratio of the granularity of the second powder are set as 1:(1.2 ~ 5), better can guarantee the briquettability of mixed powder and the accuracy of pore size control.Wherein ratio more preferably 1:(2 ~ 4 of the first powder and the granularity of the second powder).In addition, the first powder can adopt electrolytic powder (shape of electrolytic powder is strip), and the second powder can adopt atomized powder (shape of atomized powder is spherical or near-spherical).Certainly, the first powder of strip not can only adopt electrolysis mode to obtain, and also can be obtained the first powder of strip by other Preparation Technique of Powders (as oxidation-reduction method); The second powder that is spherical or near-spherical not can only adopt atomizing type to obtain, and also can obtain the second powder by other known Preparation Technique of Powders.
Further, said method also comprises step 5) polishing is carried out to form burnishing surface to the surface of described rete, the surface roughness of described burnishing surface is Ra0.8 ~ 12.5 μm.Polishing is carried out to film surface and forms burnishing surface, both thicknesses of layers was controlled, and also can effectively prevent from this burnishing surface, assembling dust during gas filtration simultaneously.The surface roughness of described burnishing surface should not be less than Ra0.8 μm, otherwise can increase polishing difficulty, also greatly can increase the osmotic resistance of rete; The surface roughness of described burnishing surface should not be less than Ra12.5 μm, otherwise will reduce dust protection assembly effect.
The surface roughness of described burnishing surface is preferably Ra1.6 ~ 12.5 μm.In addition, the surface roughness of this burnishing surface also can more preferably Ra3.2 ~ 6.3 μm.The surface roughness of burnishing surface is designed to Ra3.2 ~ 6.3 μm, is not only easy to processing, dust protection assembles excellent effect, and rete permeability is also very good.
Described carrier and rete preferably have the sintering diamond bit of compatibility by same kind or sintered ceramic porous material is formed.Such as when carrier is sintrered nickel Al intermetallic porous material, rete is all the sintrered nickel based porous materials that sintrered nickel Al intermetallic porous material or other and carrier have compatibility.
Described pre-molding base is generally tubulose, and described film liquid is attached to the outer tube surface of this pre-molding base.Certainly, pre-molding base also may be sheet or other shapes; From filtering direction, film liquid also may be attached to inside pre-molding base.
Below in conjunction with the drawings and specific embodiments, the utility model is described further.The aspect that the utility model is additional and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present utility model.
Accompanying drawing explanation
Fig. 1 is the structural representation of the inorganic porous filter element of a kind of asymmetric sintering of the present utility model.
Fig. 2 is the partial enlarged drawing at A place in Fig. 1.
Fig. 3 is a kind of structural representation sintering inorganic porous filter element of the present utility model.
The structural representation of the special-purpose polishing equipment that Fig. 4 uses for the utility model.
The structural representation of a kind of special tooling that Fig. 5 uses in the process preparing filter element for the utility model.
Detailed description of the invention
Below by two groups of experimental examples, the preparation technology to above-mentioned filter element of the present utility model and filter element is specifically described.Illustrated by these, those skilled in the art can know the outstanding feature recognizing that the preparation technology of filter element of the present utility model and filter element has.The experiment numbers below related to is consistent with the numbering of corresponding " sample ".
< first group of test example >
Tubulose for the preparation of gas filtration asymmetric cemented iron Al intermetallic porous filter elements.Comprise 4 groups of tests altogether, numbering is respectively 1-1,1-2,1-3,1-4 and 1-5.Wherein often group test comprises again 5 identical son tests, and sub-test number (son numbering) mode is " the concrete sequence number in group #+place group ", and such as, in 1-1 group the 3rd son test, numbering is 1-1-3.The powder size (but counting with " μm " when granularity is less than 400 order) of the material composition that in first group of test example, each is tested, content (by percentage to the quality) and raw material is in table 1.
Table 1---the powder size of each material composition, content and the raw material tested in first group of test example
Each son test in 1-1 group test in above-mentioned table 1 prepares asymmetric cemented iron Al intermetallic porous filter elements by preparation technology's option A.Preparation technology's option A concrete technology step is: the preparation of (1) carrier: 1. add in V-type batch mixer by the carrier powder requirement in table 1 by Fe powder and Al powder, batch mixing 8h; 2. select PVB as granulating agent, PVB is added in alcohol and dissolves, then by step 1. in the carrier powder that mixes add in mixer, slowly PVB solution is evenly added in the process stirred, stir 3-5h, then dry in 60 DEG C, baking oven, carrying out granulation by comminutor, 30 orders selected by screen cloth; 3. assembly jig, then adds FeAl granulation powder in mold cavity, is pressed into tubular pre-molding base, the demoulding by cold isostatic press; 4. load in sintering boat by pre-molding base, right fed to boiler sintering, at 1250 DEG C of temperature, sinter 5 hours, obtain carrier after cooling, described carrier average pore size is 30-40 μm, air flux>=180m
3/ m
2× h × Kpa; (2) carrier polishing: adopt the polissoir shown in Fig. 4 to carry out polishing to carrier outer tube surface, blow surface dirt off with compressed air after polishing, the surface roughness of the first burnishing surface of formation is about about Ra20 μm; (3) film liquid preparation: 1. by the film powder requirement in table 1, Fe powder and Al powder are added in V-type batch mixer, batch mixing 8h; 2. add in alcohol by ethylene glycol, ratio is (volume ratio) 1:9, mixing mixing; 3. slowly add in ethylene glycol alcohol blend by the film powder mixed in the process stirred, every 1g film powder adds 2.5ml ethylene glycol alcohol blend, stirs 1h and obtains film liquid; (4) overlay film and rete generate: be 1. fixed on Membrane jetter by carrier, are inserted by film liquid carrier pipe in film liquid, stablize transport membrane liquid, be sprayed on carrier outer tube surface by Membrane jetter by film liquid in the process stirred; 2., after spray film terminates, the carrier being attached with film liquid is put in the frock shown in Fig. 5, naturally places 0.5-1.0h, then the carrier being attached with film liquid is loaded in sintering boat, enter stove sintering, at 1250 DEG C of temperature, sinter 2 hours, form rete, the average pore size 15-20 μm of rete, air flux>=80m
3/ m
2× h × Kpa; (5) rete polishing: adopt the polissoir shown in Fig. 4 to carry out polishing to film surface, controlled by thicknesses of layers at 0.5mm, then, adopt compressed air to blow surface dirt off, the surface roughness of the second burnishing surface of formation is about Ra10 μm.
Each son test in 1-2 group test in above-mentioned table 1 prepares asymmetric cemented iron Al intermetallic porous filter elements by preparation technology's option b.The difference of preparation technology's option b and preparation technology's option A is step (5) the rete polishing eliminated in preparation technology's option A.
Each son test in 1-3 group test in above-mentioned table 1 prepares asymmetric cemented iron Al intermetallic porous filter elements by preparation technology scheme C.The difference of preparation technology scheme C and preparation technology's option A is step (2) the carrier polishing eliminated in preparation technology's option A.
Each son test in 1-4 group test in above-mentioned table 1 prepares asymmetric cemented iron Al intermetallic porous filter elements by preparation technology scheme D.Preparation technology scheme D concrete technology step is: the preparation of (1) pre-molding base: 1. add in V-type batch mixer by the carrier powder requirement in table 1 by Fe powder and Al powder, batch mixing 8h, wherein, Fe powder employs the first iron powder and the second iron powder, described first iron powder selects the electrolytic iron powder of strip, and granularity is 55 ~ 70 μm, and described second iron powder is chosen as atomized iron powder that is spherical or near-spherical, granularity is 120 ~ 150 μm, and the first iron powder accounts for 45% of Fe powder gross mass; 2. select PVB as granulating agent, PVB is added in alcohol and dissolves, then by step 1. in the carrier powder that mixes add in mixer, slowly PVB solution is evenly added in the process stirred, stir 3-5h, then dry in 60 DEG C, baking oven, carrying out granulation by comminutor, 30 orders selected by screen cloth; 3. assembly jig, then adds FeAl granulation powder in mold cavity, is pressed into tubular pre-molding base, the demoulding by cold isostatic press; (2) film liquid preparation: 1. by the film powder requirement in table 1, Fe powder and Al powder are added in V-type batch mixer, batch mixing 8h; 2. add in alcohol by ethylene glycol, ratio is (volume ratio) 1:9, mixing mixing; 3. slowly add in ethylene glycol alcohol blend by the film powder mixed in the process stirred, every 1g film powder adds 2.5ml ethylene glycol alcohol blend, stirs 1h and obtains film liquid; (3) overlay film and sintering: be 1. fixed on Membrane jetter by pre-molding base, inserts film liquid carrier pipe in film liquid, stablizes transport membrane liquid, be sprayed on pre-molding base outer tube surface by Membrane jetter by film liquid in the process stirred; 2. after spray film terminates, the pre-molding base being attached with film liquid is put in the frock shown in Fig. 5, naturally places 0.5-1.0h, then the carrier being attached with film liquid is loaded in sintering boat, enter stove sintering, at 1250 DEG C of temperature, sinter 5 hours, form carrier and rete; (4) rete polishing: adopt the polissoir shown in Fig. 4 to carry out polishing to film surface, controlled by thicknesses of layers at 0.5mm, then, adopt compressed air to blow surface dirt off, the surface roughness of the burnishing surface of formation is about Ra10.2 μm.
In first group of test example, the isostatic compaction situation of each test is see table 2.As can be seen from Table 2, only 1-4 group test each son test pre-molding body all do not find rhegma, isostatic compaction qualification rate respectively organizes test significantly better than other.
Table 2---isostatic compaction qualification rate
Note: in table 2, "×" represents that pre-molding body has rhegma; In table, " √ " represents that pre-molding body is without rhegma.
Fig. 1,2 is depicted as 1-2 group and tests the sample obtained.As shown in the figure, the carrier 110 that the cemented iron Al intermetallic porous material that it is 30 ~ 40 μm that the filter element 100 of described sample comprises by average pore size is formed and being attached on described carrier 110 and the rete 120 that forms of the cemented iron Al intermetallic being 15 ~ 20 μm by average pore size, rete 120 is positioned at the outer tube surface of filter element, wherein, carrier 110 is Ra20 μm for adhere to the surface of this rete 120 be the surface roughness of the first burnishing surface 111, first burnishing surface 111; Opposite side surface (i.e. filtering surface) contrary with the side surface that this rete 120 is attached on carrier 110 on described rete 120 is the surface roughness of the second burnishing surface 121, second burnishing surface 121 is Ra10 μm.
1-2 group tests the sample that obtains without the second burnishing surface 121.1-3 group tests the sample that obtains without the first burnishing surface 111.1-4 group tests the sample that obtains also without the first burnishing surface 111.
Follow-up use shows, 1-2 group is tested sample its rete in gas filtration obtained and be obviously inferior to other samples in the effect preventing dust from concentrating.But 1-2 group is tested the sample its rete and the carriers display in Long-Time Service process that obtain and gone out firm adhesive force, the rete attachment time that the attachment time of its rete obtains sample compared with the test of 1-3 group is longer.In addition, the thicknesses of layers that 1-1 group tests the sample obtained is the most uniform in first group of test example gained sample, and thickness is very consistent, and thickness deviation is in ± 50 μm.
< second group of test example >
For the preparation of tubulose homogeneous (without rete) the cemented iron Al intermetallic porous filter elements of gas filtration.Comprise 2 groups of tests, numbering is respectively 2-1,2-2.Wherein often group test only has 1 son test.In second group of test example, the powder size of each material composition, content (by percentage to the quality) and the raw material tested is in table 3.
Table 3---the powder size of each material composition, content and the raw material tested in second group of test example
The concrete technology step of No. 2-1 test in above-mentioned table 3 is: prepared by (1) filter element body: 1. add in V-type batch mixer by the carrier powder requirement in table 3 by Fe powder and Al powder, batch mixing 8h; 2. select PVB as granulating agent, PVB is added in alcohol and dissolves, then by step 1. in the carrier powder that mixes add in mixer, slowly PVB solution is evenly added in the process stirred, stir 3-5h, then dry in 60 DEG C, baking oven, carrying out granulation by comminutor, 30 orders selected by screen cloth; 3. assembly jig, then adds FeAl granulation powder in mold cavity, is pressed into tubular pre-molding base, the demoulding by cold isostatic press; 4. load in sintering boat by pre-molding base, right fed to boiler sintering, at 1250 DEG C of temperature, sinter 5 hours, obtain filter element body after cooling, described filter element body average pore size is 30-40 μm, air flux>=180m
3/ m
2× h × Kpa; (2) filter element body polishing: adopt the polissoir shown in Fig. 4 to carry out polishing to filter element body outer tube surface, blow surface dirt off with compressed air after polishing, the surface roughness of the burnishing surface of formation is about about Ra10 μm.
The concrete technology step of No. 2-2 test in above-mentioned table 3 is: prepared by (1) filter element body: 1. add in V-type batch mixer by the carrier powder requirement in table 3 by Fe powder and Al powder, batch mixing 8h, wherein, Fe powder employs the first iron powder and the second iron powder, described first iron powder selects the electrolytic iron powder of strip, and granularity is 55 ~ 70 μm, and described second iron powder is chosen as atomized iron powder that is spherical or near-spherical, granularity is 120 ~ 150 μm, and the first iron powder accounts for 45% of Fe powder gross mass; 2. select PVB as granulating agent, PVB is added in alcohol and dissolves, then by step 1. in the carrier powder that mixes add in mixer, slowly PVB solution is evenly added in the process stirred, stir 3-5h, then dry in 60 DEG C, baking oven, carrying out granulation by comminutor, 30 orders selected by screen cloth; 3. assembly jig, then adds FeAl granulation powder in mold cavity, is pressed into tubular pre-molding base, the demoulding by cold isostatic press; 4. load in sintering boat by pre-molding base, right fed to boiler sintering, at 1100 DEG C of temperature, sinter 5 hours, obtain filter element body after cooling, described filter element body average pore size is 30-40 μm, air flux>=180m
3/ m
2× h × Kpa; (2) filter element body polishing: adopt the polissoir shown in Fig. 4 to carry out polishing to filter element body outer tube surface, blow surface dirt off with compressed air after polishing, the surface roughness of the burnishing surface of formation is about about Ra10 μm.
Figure 3 shows that No. 2-1, the sample that obtains of 2-2 test.As shown in the figure, it comprises and forms filter element body 200 by cemented iron Al intermetallic porous material, and the outer tube surface of filter element body 200 is filtering surface 210, and described filtering surface 210 is burnishing surface, and the surface roughness of this burnishing surface is Ra10 μm.Follow-up use shows, sample its filtering surface in gas filtration that No. 2-1 and 2-2 test obtain is concentrated more existing tubulose homogeneous (without rete) cemented iron Al intermetallic porous filter elements in problem at dust and obviously improved.In addition, owing to taking any special measures in the basic material powder of No. 2-2 test in carrier powder, increase the overall activity of basic material powder, thus reduce sintering temperature.
About the polissoir shown in Fig. 4, as shown in the figure, it specifically comprises: centerless external cylindrical polishing mechanism 310, and described centerless external cylindrical polishing mechanism 310 comprises polishing wheel 311 (can require to select according to polishing the sized flap wheel of different model), guide wheel 312 and supporting plate 313; Outer dust box 320, described centerless external cylindrical polishing mechanism 310 is positioned in this outer dust box 320, outer dust box 320 has the charging aperture 322 corresponding with supporting plate 313 entrance side and the discharging opening 321 corresponding with supporting plate 313 outlet side; And dust exhaust apparatus, described dust exhaust apparatus is connected with outer dust box 320 by dust sucting pipeline 331.During use, above described tubular carrier (or tubulose pre-molding base) is sent into from charging aperture 322, sends after polishing from discharging opening 321 again.Wherein, outer dust box 320 can prevent dust recycling, and utilizes dust exhaust apparatus to carry out the collection of dust, ensure that on-the-spot working environment.
Shown in Fig. 5 is a kind of frock being specifically designed to the volatilization of film liquid.It is made up of the flexible inner position body 430 in base plate 410, support bar 420 and top, on base plate 410, interval is furnished with multiple described support bar 420, the flexible inner position body 430 in a top is all equipped with in the upper end of each root support bar 420, during use, tubular carrier is put upside down into corresponding support bar 420, the flexible inner position body 430 in top was contacted with the end in carrier, just can support carrier, the film liquid of its outer tube surface is fully volatilized.
Claims (5)
1. sinter inorganic porous filter element, comprise the filter element body (200) be made up of sintered inorganic material, the surface of filter element body (200) is filtering surface (210), it is characterized in that: described filtering surface (210) is burnishing surface, the surface roughness of this burnishing surface is Ra3.2 ~ 25 μm.
2. the inorganic porous filter element of sintering as claimed in claim 1, is characterized in that: the surface roughness of described burnishing surface is Ra6.3 ~ 12.5 μm.
3. the inorganic porous filter element of sintering as claimed in claim 1, is characterized in that: described filter element body (200) is made up of sintering diamond bit or sintered ceramic porous material.
4. the inorganic porous filter element of sintering as claimed in claim 1, is characterized in that: described filter element body (200) is tubulose, and its filtering surface (210) is positioned at the outer tube surface of this filter element body (200).
5. the special-purpose polishing equipment of the inorganic porous filter element of the sintering described in manufacturing claims 4, it is characterized in that, comprise: centerless external cylindrical polishing mechanism (310), described centerless external cylindrical polishing mechanism (310) comprises polishing wheel (311), guide wheel (312) and supporting plate (313); Outer dust box (320), described centerless external cylindrical polishing mechanism (310) is positioned in this outer dust box (320), outer dust box (320) has the charging aperture corresponding with supporting plate (313) entrance side and the discharging opening corresponding with supporting plate (313) outlet side; And dust exhaust apparatus (330), described dust exhaust apparatus (330) is connected with outer dust box (320) by dust sucting pipeline (331).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106392792A (en) * | 2016-09-20 | 2017-02-15 | 福建福晶科技股份有限公司 | Device used for high-speed polishing of optical cylindrical rods |
| CN107877363A (en) * | 2016-09-29 | 2018-04-06 | 波音公司 | It is ground cabin assembly and the method for being ground workpiece |
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2014
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106392792A (en) * | 2016-09-20 | 2017-02-15 | 福建福晶科技股份有限公司 | Device used for high-speed polishing of optical cylindrical rods |
| CN107877363A (en) * | 2016-09-29 | 2018-04-06 | 波音公司 | It is ground cabin assembly and the method for being ground workpiece |
| CN107877363B (en) * | 2016-09-29 | 2021-06-01 | 波音公司 | Grinding chamber assembly and method for grinding a workpiece |
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