CN104727903B - A kind of ceramic fibre liner and preparation method thereof - Google Patents

A kind of ceramic fibre liner and preparation method thereof Download PDF

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Publication number
CN104727903B
CN104727903B CN201510043671.0A CN201510043671A CN104727903B CN 104727903 B CN104727903 B CN 104727903B CN 201510043671 A CN201510043671 A CN 201510043671A CN 104727903 B CN104727903 B CN 104727903B
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ceramic fibre
liner
silane coupler
drying
weight
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CN104727903A (en
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王志博
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Xixia County Henan Province Katyuan Metallurgical Material Co Ltd
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Xixia County Henan Province Katyuan Metallurgical Material Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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  • Sealing Material Composition (AREA)
  • Gasket Seals (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Inorganic Fibers (AREA)
  • Producing Shaped Articles From Materials (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

A kind of ceramic fibre liner and preparation method thereof, belong to motor-vehicle tail-gas post-processing technology field.Scheme one：A kind of ceramic fibre liner, the ceramic fibre padded after being handled by silane coupler, without chemically treated ceramic fibre, expanding material, adhesive, filler and additive are made, the parts by weight of ceramic fibre wherein after silane coupler processing are 0~99, parts by weight without chemically treated ceramic fibre are 0~99, and the parts by weight of expanding material are 0~60, and the parts by weight of adhesive are 1~15, the parts by weight of filler are 0~5, and the parts by weight of additive are 0~5；Scheme two：It is Step 1: with slurry；Step 2: diddle-net shaping；Step 3: dry；Step 4: excision forming.The present invention is used for motor-vehicle tail-gas and post-processed.

Description

A kind of ceramic fibre liner and preparation method thereof
Technical field
The present invention relates to a kind of ceramic fibre liner and preparation method thereof, belongs to motor-vehicle tail-gas post-processing technology neck Domain.
Background technology
Automobile three-way catalysts, diesel oxidation reforming unit, diesel engine selective catalytic reduction device and diesel oil The pollution control devices such as machine particulate filter are widely used in motor-vehicle tail-gas post processing field, to the waste gas of internal combustion engine discharge Handled, make up to qualified discharge standard, to control atmosphere pollution.These devices typically all include one or more dirty Control unit is contaminated, ceramic monolith, metal shell, liner are included in each unit.
Because the thermal coefficient of expansion of ceramic monolith is used for low 10 times or so of the metal shell of its container, under high temperature between the two Gap increases.Liner is respectively provided with enough expansion characters under normal temperature and high temperature, it is sufficient to compensates the expansion between carrier and housing Wide arc gap, play a part of fixation, damping, sealing, heat-insulated, noise reduction in whole operating temperature section.Ceramic monolith have it is hard, The characteristics of crisp, easy fragmentation, pollution control unit fails if carrier fragmentation.Liner can not provide uniform expansive force Cause one of major reason of carrier fragmentation, therefore to overall uniform of the dispersiveness of intumescent material, liner in pad Property proposes requirement.Because motor vehicle is needed in operation and the two kinds of operating mode alternate runs that stop working, the temperature of pollution control unit Replace therewith between normal temperature and high temperature, the gap between carrier and housing also expands and reduced therewith, to the machine of liner Tool durability proposes requirement.The edge of liner is exposed in high-temperature tail gas air-flow, to the resistance to deflation performance of liner Propose requirement.
Publication No. CN102421598A Chinese patent discloses compound close of a kind of inorfil and polymer fiber Envelope pad, the pad has good flexibility, but the polymer fiber due to wherein containing burns mistake at high temperature, and the product is not Possess good mechanical endurance and resistance to deflation performance；Publication No. CN101755024B Chinese patent discloses a kind of surface The inorfil liner of pressure sensitive adhesive is coated, Publication No. CN101772626A Chinese patent is disclosed one kind and lived using heat Change the inorfil liner of adhesive, Publication No. CN101331255B Chinese patent discloses a kind of dry fabrication The technique of long and short inorganic fiber mix liner, above-mentioned three kinds of products simultaneously without good mechanical endurance and resistance to blow Corrosion energy；Publication No. CN100478169C Chinese patent discloses a kind of two layers inorfil lining different by expansion character The composite sealing gasket and its manufacture method, Publication No. CN101115688B Chinese patent that pad combination is formed disclose one Plant the liner and its preparation technology that by biosoluble inorganic fibers and the inorfil through Overheating Treatment is compound, publication number A kind of ceramic fibre fibrous layer and aluminium-magnesium silicate prepared with sol-gel process is disclosed for CN1806101A Chinese patent The liner of glass layer composite construction, liner prepared by these three methods possess stable mechanical endurance, but The cost of raw material is very high；It is fine with ceramic polycrystalline that Publication No. CN1128923C Chinese patent discloses a kind of annealed ceramic fibers The liner of mixture composition is tieed up, there is good resistance to deflation performance, but the cost of raw material is very high.Summary, it is above-mentioned several close Although envelope pad possesses good performance, the material and technique used yet with it, production cost remains high.Publication No. CN101900020B Chinese patent discloses a kind of composite sealing gasket of extrusion forming, multiple comprising graphite-inorfil Close layer and vermiculite-inorfil composite bed, but the introducing of graphite can cause the decline of liner heat-proof quality, the product by Market；Publication No. CN102877918A Chinese patent discloses a kind of liner using metallic fiber, but gold The heat-proof quality for belonging to fiber is too poor, it is impossible to applied to reality；Publication No. CN102465740A Chinese patent discloses one kind The inorfil liner of musculus cutaneus technique making is squeezed using dry method, Publication No. CN100554658C's and CN101260822B Chinese patent discloses vacuum filtration, the liner of composite molding, and the common feature of three is that liner inhomogeneities is big, Easily cause to carry fragmentation failure in actual applications.In addition, mechanical endurance of the product of domestic manufacturer to liner Lack with resistance to deflation performance and understand and pay close attention to, cause domestic liner performance to lag behind advanced international standard for a long time.
The content of the invention
The present invention solves the problems, such as in order to above-mentioned, and then provides a kind of ceramic fibre liner and preparation method thereof.
The present invention adopts the technical scheme that to solve above-mentioned technical problem：Scheme one：A kind of ceramic fibre liner, It is characterized in that：The ceramic fibre padded after being handled by silane coupler, without chemically treated ceramic fibre, expand material Material, adhesive, filler and additive are made, and the parts by weight of the wherein ceramic fibre after silane coupler processing are 0~99, not The parts by weight of chemically treated ceramic fibre are 0~99, and the parts by weight of expanding material are 0~60, the weight of adhesive Number is 1~15, and the parts by weight of filler are 0~5, and the parts by weight of additive are 0~5；
Scheme two：Methods described comprises the following steps：It is Step 1: with slurry：By the ceramic fibre after quantitative chemical treatment, It is added to the water without chemically treated ceramic fibre, expanding material, filler, adds dispersant, is made into fibre concentration as 3~6% Mixture, after adding defoamer, apply high-speed stirred and the solid in slurry disperse to make it be evenly distributed, when scattered Between be 2~30 minutes, then add adhesive and surfactant successively, add flocculant under lasting stirring at low speed, make Fleeces in slurry congeals into group, and expanding material is wrapped in fiber floc sedimentation with filler.Expanding material and filler can also be Added after fiber flocculation；
Step 2: diddle-net shaping：The shaping mould slurry prepared injection being placed on vacuum tank intrinsic permeability silk screen In tool, the 1-20 seconds are stood, make between each fiber floc sedimentation fully to interweave in slurry, vacuum is 0.05~0.1MPa, uses pressure Roll pressing pads wet base, removes mould, and will pad wet base from permeability silk screen using flight removes；
Step 3: dry：Drying means is the combination of convective drying or microwave drying or both；When using only convective drying When, for hot dry air temperature control at 60~120 DEG C, drying time is 1~12 hour；When using only microwave drying, Microwave Frequency Rate is 0.5~2 hour in 2450 megahertzs of drying times；When convective drying and microwave drying are used in combination, first with to draining off Moisture in dry removing liner, reuse microwave drying emphasis and pad centers are thermally dried, remove remaining water Point；
Step 4: excision forming：Dried liner semi-finished product are further, according to the manuscript of actual requirement Paper, finished product is made using laser cutting, stamping forming processing mode.
The beneficial effects of the invention are as follows：Ceramic fibre liner in the present invention, it is fine using the ceramics after chemical treatment Dimension and framework material of the mixture without chemically treated ceramic fibre as liner, have compared with similar products more Strong mechanical endurance energy and resistance to deflation performance, and there is the advantages of cost of raw material is low.Walked using Wetting diddle-net technique Suddenly, not only make expanding material being distributed in inorfil skeleton evenly, also improve the uniform of liner global formation Degree.
Embodiment
Embodiment one：Present embodiment is described further and said to the present invention below in conjunction with specific embodiment It is bright.
The pad handled by silane coupler after ceramic fibre, without chemically treated ceramic fibre, expanding material, Adhesive, filler and additive are made, and the parts by weight of the wherein ceramic fibre after silane coupler processing are 0~99, without The parts by weight of chemically treated ceramic fibre are 0~99, and the parts by weight of expanding material are 0~60, the parts by weight of adhesive Number is 1~15, and the parts by weight of filler are 0~5, and the parts by weight of additive are 0~5.
Expanding material includes the mixture of unexpanded vermiculite, expansible graphite or said two devices.
Adhesive includes organic bond and inorganic bond, and it is fine to include modified starch, carboxymethyl for wherein organic bond Plain sodium, ethyl acetate latex, acrylic latex, natural rubber latex, styrene-butadiene latex and latex methacrylate are tieed up, it is inorganic viscous Mixture includes sodium metasilicate, sodium bentonite, calcium-base bentonite, Ludox, Alumina gel, clay or above-mentioned one or more compositions Combination.
Filler includes vermiculite, mica, the group of perlite or above-mentioned one or more compositions after hollow glass micropearl, expansion Close.
Additive includes the combination of surfactant, defoamer, flocculant, dispersant or above-mentioned one or more compositions.
Ceramic fibre after embodiment two, silane coupler processing is made as follows：Step 1: by silane Coupling agent is made into the weak solution of 0.5~1% concentration；Pending ceramic fibre is immersed in the weak solution in step 1 by step 2 In, the time is 5~30 minutes；Step 3: it is dried for standby after taking out at 80~150 DEG C.
Embodiment three, methods described comprise the following steps：It is Step 1: with slurry：After quantitative chemical treatment Ceramic fibre, it is added to the water without chemically treated ceramic fibre, expanding material, filler, adds dispersant, be made into fibre concentration For 3~6% mixture, after adding defoamer, apply high-speed stirred and the solid in slurry is disperseed to make its distribution equal Even, jitter time is 2~30 minutes, then adds adhesive and surfactant successively, is added under lasting stirring at low speed Flocculant, makes the fleeces in slurry congeal into group, and expanding material is wrapped in fiber floc sedimentation with filler.Expanding material and filler It can also be added after fiber flocculates；
Step 2: diddle-net shaping：The shaping mould slurry prepared injection being placed on vacuum tank intrinsic permeability silk screen In tool, the 1-20 seconds are stood, make between each fiber floc sedimentation fully to interweave in slurry, vacuum is 0.05~0.1MPa, uses pressure Roll pressing pads wet base, removes mould, and will pad wet base from permeability silk screen using flight removes；
Step 3: dry：Drying means is the combination of convective drying or microwave drying or both；When using only convective drying When, for hot dry air temperature control at 60~120 DEG C, drying time is 1~12 hour；When using only microwave drying, Microwave Frequency Rate is 0.5~2 hour in 2450 megahertzs of drying times；When convective drying and microwave drying are used in combination, first with to draining off Moisture in dry removing liner, reuse microwave drying emphasis and pad centers are thermally dried, remove remaining water Point；
Step 4: excision forming：Dried liner semi-finished product are further, according to the manuscript of actual requirement Paper, finished product is made using laser cutting, stamping forming processing mode.
The step of embodiment four, chemical treatment ceramic fibre, is as follows：Weigh 100g ceramic fibres, wherein content Al2O3For 55%, SiO2And Al2O3Content is 99%, and fibre diameter is 5~8 μm, and fibre length is 1~20mm, uses slagging-off work Skill removes the slag ball in ceramic fibre, is less than 5% mass fraction to shot content.
50g aminopropyl triethoxysilanes (KH-550) solution, stirring hydrolysis 10 minutes are added in 2000ml water.Will be upper State in the hydrolyzate that ceramic fibre fully enters silane coupler, dipping takes out after 10 minutes, filters, is dried in 80 DEG C of baking ovens It is standby.
The method for preparing pad is as follows：It is Step 1: with slurry：Weigh by chemically treated ceramic fibre 1830g, unmodified Unexpanded vermiculite 2030g, together add 80 liters of water in, add the 50ml concentrated sulfuric acids (98%) make dispersant, 20ml nonionics Defoamer, it is scattered 5 minutes with 200 revs/min of rotating speed using turbine stirrer.Continuously add 150g ethyl acetate latex, 50g Sodium metasilicate is adhesive, 20ml nonionic surface active agent.Mixing speed is reduced to 60 revs/min, adds 50g polyaluminiums Aluminium is flocculated；
Step 2: diddle-net shaping：The mould for being 1m × 1m × 6mm by the slurry prepared injection size, after standing 10 seconds, profit Vacuumized 20 seconds and be molded with 0.1MPa vacuum with vacuum tank.Wet base is suppressed using the continuous pressure roller of twice twice, and pressure roller is high Spend for 6mm.Mould is removed, wet base will be padded using flight and removes.
Step 3: dry：Using 120 DEG C of hot dry airs convective drying is carried out to padding wet base.Drying time is 2 small When.
Step 4: cutting：Using numerical control laser cutter, by pad be processed as needed for shape finished product.Manufactured pad Density be 4110g/m2。
The step of embodiment five, chemical treatment ceramic fibre, is as follows：Weigh 100g ceramic fibres, wherein content Al2O3For 55%, SiO2And Al2O3Content is 99%, and fibre diameter is 5~8 μm, and fibre length is 1~20mm, uses slagging-off work Skill removes the slag ball in ceramic fibre, is less than 5% mass fraction to shot content.
50g aminopropyl triethoxysilanes (KH-550) solution, stirring hydrolysis 10 minutes are added in 2000ml water.Will be upper State in the hydrolyzate that ceramic fibre fully enters silane coupler, dipping takes out after 10 minutes, filters, is dried in 80 DEG C of baking ovens It is standby.
Weigh without chemically treated ceramic fibre 930g, by chemically treated ceramic fibre 930g, it is unmodified not Expanded vermiculite 2000g, together add in 80 liters of water, add the 50ml concentrated sulfuric acids (98%) and make dispersant, the defoaming of 20ml nonionics Agent, it is scattered 5 minutes with 180 revs/min of rotating speed using turbine stirrer.Continuously add 180g modified starches, 50g sodium metasilicate is Adhesive, 20ml nonionic surface active agent.Mixing speed is reduced to 60 revs/min, 50g aluminium polychlorides is added and is wadded a quilt with cotton It is solidifying.
Preparation flow afterwards is identical with embodiment four.The density of manufactured pad is 4070g/m2。
The step of embodiment six, chemical treatment ceramic fibre, is as follows：Weigh 100g ceramic fibres, wherein content Al2O3For 55%, SiO2And Al2O3Content is 99%, and fibre diameter is 5~8 μm, and fibre length is 1~20mm, uses slagging-off work Skill removes the slag ball in ceramic fibre, is less than 5% mass fraction to shot content.
50g aminopropyl triethoxysilanes (KH-550) solution, stirring hydrolysis 10 minutes are added in 2000ml water.Will be upper State in the hydrolyzate that ceramic fibre fully enters silane coupler, dipping takes out after 10 minutes, filters, is dried in 80 DEG C of baking ovens It is standby.
Weigh without chemically treated ceramic fibre 1850g, unmodified unexpanded vermiculite 2000g, together add 80 liters In water, add the 50ml concentrated sulfuric acids (98%) and make dispersant, 20ml nonionic defoamers, using turbine stirrer with 200 revs/min The rotating speed of clock is scattered 10 minutes.It is adhesive to continuously add 250g sodium carboxymethylcelluloses, 20ml nonionic surface active agent. Mixing speed is reduced to 60 revs/min, 50g polyaluminium sulfates is added and is flocculated.
Preparation flow afterwards is identical with embodiment four.The density of manufactured pad is 4090g/m2。
Comparative example one：
Liner in comparative example 1 is purchased from company of the U.S., model InteramTM100, its thickness is 6.05mm, Surface density is 4100g/mm2。
Embodiment four to six (be respectively defined as A, B, No. C) and comparative example 1 are unified under similarity condition and carried out Homogeneity of product is analyzed, and it the results are shown in Table 1.
Table 1
Progress mechanical endurance analysis under similarity condition is unified in embodiment four to six and comparative example 1, it is tied Fruit is shown in Table 2.
Table 2
Embodiment four to six and comparative example 1, which are unified under similarity condition, carries out resistance to deflation performance test, its result It is shown in Table 3.
Table 3
Contrasted by uniformity described in table 1, the example IV carried out using the inventive method is to close described in six Envelope cushioning product is better than comparative example 1 in the uniformity of integral material；The expanding material compared with comparative example 1 of example IV, five Deployment conditions are more preferable, and for embodiment six compared with comparative example 1, expanding material deployment conditions are very close.It can be seen that use Wetting Dip net technique productions liner, it is ensured that product has very high uniformity levels.
Analyzed by the mechanical endurance described in table 2：By 19 times circulation after, liner in example IV Expansive force residue is more than liner in comparative example 1, illustrates that its mechanical endurance is more preferable；Liner is swollen in embodiment five Expansive force residue is less than example IV and liner described in comparative example 1, illustrates that its mechanical endurance is slightly poor, but and comparative example The mechanical endurance padded described in 1 hardly differs；The expansive force residue of liner is minimum in embodiment six, illustrates its machine Tool durability to be inferior to example IV, five and comparative example 1 described in liner.It can be seen that using silane coupler to sealing lining The ceramic fibre raw material of pad is chemically treated, and can strengthen its mechanical endurance, and reach advanced level.
By the rate of corrosion data described in table 3, the best performance of resistance to deflation of liner described in example IV, contrast Liner described in example 1 takes second place, and liner described in embodiment five again, but is more or less the same with comparative example 1, and worst is to implement Liner described in example six.It can be seen that the ceramic fibre raw material of liner is chemically treated using silane coupler, can To strengthen its resistance to deflation performance, and reach advanced level.
Method of testing is according to as follows：
Homogeneity of product is analyzed
The test measures liner finished product each several part density and the uniformity of composition.Using numerical control laser cutter from close The each position grab sample 20 of envelope pad finished product is simultaneously numbered, and sample size is 20 × 20mm.Point that service precision is 0.0001g Analysis balance to samples weighing and records.Whole samples are placed in Muffle furnace 2 hours are heat-treated at 750 DEG C with except debindered Agent, after being disperseed using ethanol, separated using sinking speed official post fiber with expanding material.Expanding material is weighed and remembered after drying Record.Sample gross weight, the average and variance of expanding material weight contained by sample are calculated respectively.
Mechanical endurance is analyzed
The test can provide sealing lining to determine the influence for the expansive force that gap change can be provided to liner Pad the comparative data of mechanical endurance energy.Using laser cutting liner sample to 20 × 20mm, it is put into Muffle furnace 2 hours are heat-treated at 750 DEG C to remove adhesive.Sample is transferred on electron pressure test machine after natural cooling.With The speed compression sample of 0.1mm/ seconds to its actual installation in pollutant control units gap (involved sealing herein Pad as 4mm) after, static 15 seconds, the expansion force data of gasket sample now is read, sample is discharged with the speed of 0.1mm/ seconds afterwards Product are designated as one cycle to the free state not being stressed.20 second compressions-release cycle is carried out by above-mentioned steps, is recorded and whole Liner expands force data to reason corresponding to circulation every time.
Resistance to deflation performance test
The test is surveyed in the accelerated ageing carried out than pollutant control units actual service conditions under conditions of severeer Examination, the comparative data of the resistance to deflation performance of liner can be provided.Sealed sample pad is arranged in fixture, gap is installed For model liner installation gap actual in pollutant control units (involved liner is 4mm herein) Or it is each up and down on the basis of the installation gap float 10%, be heated to 750 DEG C and constant temperature 2 hours to remove adhesive, Ran Houbao Reveal liner edge 24 hours in the unheated air constantly moved, air stream outlet pressure is 0.15MPa, stops deflation afterwards, is surveyed Determine sample weight loss.

Claims (6)

  1. A kind of 1. ceramic fibre liner, it is characterised in that：After the pad is by silane coupler hydrolysate individually processing Ceramic fibre, without chemically treated ceramic fibre, expanding material, adhesive, filler and additive are made, and wherein silane is even The parts by weight for joining the ceramic fibre after agent hydrolysate is individually handled are 0~99, the weight without chemically treated ceramic fibre It is 0~99 to measure number, and the parts by weight of expanding material are 0~60, and the parts by weight of adhesive are 1~15, the parts by weight of filler Number is 0~5, and the parts by weight of additive are 0~5；Wherein described silane coupler processing ceramic fibre is as follows：Step The first, silane coupler is made into the silane coupler weak solution of 0.5~1% concentration；Step 2 soaks pending ceramic fibre For stain in the silane coupler weak solution, the time is 5~30 minutes；Obtained Step 3: being dried after taking out at 80~150 DEG C Ceramic fibre after the independent processing of the silane coupler hydrolysate.
  2. A kind of 2. ceramic fibre liner according to claim 1, it is characterised in that expanding material include unexpanded vermiculite, The mixture of expansible graphite or said two devices.
  3. A kind of 3. ceramic fibre liner according to claim 1, it is characterised in that adhesive include organic bond and Inorganic bond, wherein organic bond include modified starch, sodium carboxymethylcellulose, ethyl acetate latex, acrylic latex, Natural rubber latex, styrene-butadiene latex and latex methacrylate, inorganic bond include sodium metasilicate, sodium bentonite, calcium base The combination of bentonite, Ludox, Alumina gel, clay or above-mentioned one or more compositions.
  4. 4. a kind of ceramic fibre liner according to claim 1, it is characterised in that filler includes hollow glass micropearl, swollen The combination of swollen vermiculite, mica, perlite or above-mentioned one or more compositions afterwards.
  5. 5. a kind of ceramic fibre liner according to claim 1, it is characterised in that additive includes surfactant, disappeared The combination of infusion, flocculant, dispersant or above-mentioned one or more compositions.
  6. A kind of 6. preparation method of ceramic fibre liner as claimed in claim 1, it is characterised in that：Methods described includes Following steps：Step 1: ceramic fibre pre-processes：The silane coupler that silane coupler is made into 0.5~1% concentration is dilute molten Liquid；Pending ceramic fibre is immersed in the silane coupler weak solution, the time is 5~30 minutes；80 after taking-up Drying obtains the ceramic fibre after silane coupler hydrolysate is individually handled at~150 DEG C；
    It is Step 2: with slurry：By the ceramic fibre after silane coupler hydrolysate individually processing, without chemically treated ceramics fibre Dimension, expanding material, filler are added to the water, and add dispersant, are made into the mixture that fibre concentration is 3~6%, add defoamer Afterwards, apply high-speed stirred the solid in slurry is disperseed to make it be evenly distributed, jitter time is 2~30 minutes, Ran Houyi Secondary addition adhesive and surfactant, add flocculant under lasting stirring at low speed, the fleeces in slurry is congealed into group, Expanding material is wrapped in fiber floc sedimentation with filler, and expanding material and filler can also add after fiber flocculates；
    Step 3: diddle-net shaping：In the mould that the slurry prepared injection is placed on vacuum tank intrinsic permeability silk screen, The 1-20 seconds are stood, make between each fiber floc sedimentation fully to interweave in slurry, vacuum is 0.05~0.1MPa, is suppressed using pressure roller Pad wet base, remove mould, will pad wet base from permeability silk screen using flight removes；
    Step 4: dry：Drying means is the combination of convective drying or microwave drying or both；When using only convective drying, For hot dry air temperature control at 60~120 DEG C, drying time is 1~12 hour；When using only microwave drying, microwave frequency exists 2450 megahertzs of drying times are 0.5~2 hour；When convective drying and microwave drying are used in combination, removed first with convective drying The moisture gone in liner, reuse microwave drying emphasis and pad centers are thermally dried, remove remaining moisture；
    Step 5: excision forming：Dried liner semi-finished product are further, according to the processing drawing of actual requirement, make Finished product is made with laser cutting, stamping forming processing mode.
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