CN105272351B - A kind of preparation method of rare earth foam ceramic filter - Google Patents
A kind of preparation method of rare earth foam ceramic filter Download PDFInfo
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- CN105272351B CN105272351B CN201510701697.XA CN201510701697A CN105272351B CN 105272351 B CN105272351 B CN 105272351B CN 201510701697 A CN201510701697 A CN 201510701697A CN 105272351 B CN105272351 B CN 105272351B
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Abstract
The invention belongs to cast the preparation method technical field with ceramic filter, it is related to a kind of preparation method of rare earth foam ceramic filter, comprises the following steps：Ceramic slurry is prepared, rare earth, ceramic aggregate and binding agent are mixed by weight, ceramic slurry A and ceramic slurry B is configured to；Idiosome is prepared, polyurethane foam carrier is impregnated into ceramic slurry A, ceramic slurry A is fully absorbed, by rolling forming device roll forming, idiosome is made, is strengthened idiosome upper and lower surface and core twice by getting rid of glaze equipment after idiosome is dried；High temperature sintering, secondary hardening and the idiosome after drying are put into high temperature sintering furnace and are sintered, and obtain rare earth foam ceramic filter；Sintering period is short, saves the energy；The breakage of idiosome is avoided, while making slurry attachment more uniform；Idiosome by getting rid of glaze reinforcing twice, and internal slurry is evenly distributed, difficult for drop-off, burns till rear product property stable.
Description
Technical field
The invention belongs to cast the preparation method technical field with ceramic filter, specifically, it is related to a kind of rare earth bubble
The preparation method of foam ceramic filter.
Background technology
Rare earth element refers to the IIIB races being located in the periodic table of elements, and rare earth element has unique configuration of extra-nuclear electron,
The performance of metal and alloy materials can effectively be improved.In recent years, rare earth new material is researched and developed and its in high-tech industry
In application be looked at as the standards of a national high-tech levels.Research shows that rare earth is to metal and its alloy group
The influence knitted is mainly reflected in three and used：(1) catharsis：One be rare earth and oxygen, sulphur, hydrogen affinity it is very strong, formed
Fusing point is higher, heat endurance is strong, the less rare earth compound of proportion, so as to reach the effect of desulfurization, deoxidation, dehydrogenation；Two be dilute
Soil with after the objectionable impurities in alloy molten solution such as Pb, Bi formation refractory metal key compound floating with slag from alloy molten solution
In discharge together, so as to reduce the valid density of impurity in matrix；(2) thinning microstructure：Rare earth fining metal and its alloy structure
The mechanism of action be primarily present three aspects：One is to form new nucleus, suppression crystal grain to grow up；Two be micro- catharsis；Three be to close
Aurification is acted on；(3) influence of the rare earth to field trash：Influence of the rare earth to field trash mainly changes form and the distribution of impurity,
The compound containing rare earth is attracted on the crystal boundary of metal or alloy, reduce the number of low melting point objectionable impurities on alloy crystal boundary
Amount.Therefore, appropriate rare earth is effectively added in metal and its alloy molten solution, the machine of metal and its alloy is can obviously improve and improve
Tool performance, decay resistance and anti-wear performance etc..
Ceramic foam filter can effectively remove a large amount of field trashes and objectionable impurities in metal and its alloy molten solution, improve
The inherent quality of metal.But because being limited by aperture and flow velocity, it is difficult to a large amount of thin present in metal and its alloy molten solution
Small field trash and objectionable impurities effectively filter and purify, and this makes ceramic foam filter net in the filtering of metal alloy liquation
Promotion and application in change technology are greatly limited, it is impossible to meet harsh to metal and its alloy molten solution filtering requirement
The requirement of large-tonnage product.
Chinese patent application 201010511259.4 discloses a kind of method for preparing yttria foamed ceramic filter, will
3rd ceramic foam filter biscuit is immersed in B component ceramic slurry made from step 2, is taken out, is obtained after 1~5min of dipping
To the second impregnating；Then the second impregnating is arranged on centrifuge, removed under the conditions of centrifugal drying slurry in the second impregnating
Unnecessary B component ceramic slurry, obtains the 4th ceramic foam filter biscuit；Idiosome after sintering, centrifugation is dried afterwards
Internal slurry distribution is not uniform enough, and the structure of polyurethane foam is easily destroyed in centrifugal process.
The content of the invention
It is an object of the invention to overcome the shortcoming that prior art is present, seek to design that a kind of sintering period is short, idiosome slurry
The preparation method of the uniform rare earth foam ceramic filter of material coating, improves production efficiency, saves the energy.
To achieve these goals, the technical solution adopted by the present invention is：A kind of preparation of rare earth foam ceramic filter
Method, comprises the following steps：
Step 1：Prepare ceramic slurry
Ceramic slurry component, including rare earth, ceramic aggregate and binding agent are weighed by following parts by weight,
The rare earth includes：20~30 parts of cerium race rare earth, 10~15 parts of yttrium race rare earth；
The ceramic aggregate includes：10~15 parts of silicon ash, 15~20 parts of aluminum oxide, 20~30 parts of green silicon carbide, black carbonization
40~50 parts of silicon, 2~5 parts of cellucotton；
The binding agent includes：3~5 parts of polyvinyl alcohol, mass fraction are 40% 5~10 parts of Ludox；
The rare earth is ground, sieve to obtain the following rare earth powder of 300 mesh, by rare earth powder and ceramic aggregate and bonding
Agent is mixed, and ceramic slurry A is made in the stirring that adds water, and viscosity is 3000~4000CP；Ceramic slurry B, ceramic slurry is made in the stirring that adds water
The viscosity for expecting B is to be surveyed 15~20 seconds using coating -4 viscosity meter；
Preferably, gate stirrer is used during stirring, speed of agitator is 60-120r/min；
Step 2：Prepare idiosome
Polyurethane foam carrier is impregnated into ceramic slurry A, ceramic slurry A is fully absorbed, passes through rolling forming device
Roll forming, is made idiosome, is strengthened idiosome upper surface and core by getting rid of glaze equipment after idiosome is dried, once by force
Idiosome after change is overturn after drying by tipper, carries out idiosome lower surface and core again by glaze equipment is got rid of
Idiosome after reinforcing, secondary hardening enters next step after drying；
Preferably, drying temperature is 100~150 DEG C, and drying time is 25~30min；
Step 3：High temperature sintering
Idiosome by step 2 secondary hardening and after drying, which is put into high temperature sintering furnace, to be sintered, and the sintering period is 2.5
~5h, during sintering preheating section temperature be 200-500 DEG C, low-temperature zone temperature be 500-900 DEG C, high temperature section temperature be 900-1300
DEG C, temperature descending section temperature be 600-300 DEG C, sintering atmosphere control be：Preheating section is oxidizing atmosphere, and high temperature section is weak oxide atmosphere
Or weakly reducing atmosphere；
Step 4：Surface treatment
Rare earth foam ceramic filter after will be sintered is repaired with the grinding stone of 60-100 mesh, removes unnecessary hair
Thorn.
Beneficial effects of the present invention are：(1) sintering period is short, saves the energy；(2) ceramic filter prepared by can be to gold
A large amount of fine foreign matters and objectionable impurities present in category and its alloy molten solution effectively filter and purify；(3) idiosome is strong
During change, idiosome is positioned horizontally in conveyer all the time, only passes through once inside out, it is to avoid the breakage of idiosome, while making slurry
Attachment is more uniform；(4) idiosome by getting rid of glaze reinforcing twice, and internal slurry is evenly distributed, difficult for drop-off, burns till rear product property
It is stable.
Embodiment
Below by specific embodiment, the invention will be further described：
Embodiment 1
The preparation method of the rare earth foam ceramic filter of the present embodiment, comprises the following steps：
Step 1：Prepare ceramic slurry
Ceramic slurry component, including rare earth, ceramic aggregate and binding agent are weighed by following parts by weight,
The rare earth includes：20 parts of cerium race rare earth, 15 parts of yttrium race rare earth；
The ceramic aggregate includes：10 parts of silicon ash, 20 parts of aluminum oxide, 30 parts of green silicon carbide, 50 parts of black silicon carbide, cellucotton
2 parts；
The binding agent includes：5 parts of polyvinyl alcohol, mass fraction are 40% 5 parts of Ludox；
The rare earth is ground, sieve to obtain the following rare earth powder of 300 mesh, by rare earth powder and ceramic aggregate and bonding
Agent is mixed, and ceramic slurry A is made in the stirring that adds water, and viscosity is 3000CP；The viscous of ceramic slurry B, ceramic slurry B is made in the stirring that adds water
Spend to survey 15~20 seconds using coating -4 viscosity meter；
Gate stirrer is used during stirring, speed of agitator is 60-120r/min；
Step 2：Prepare idiosome
Polyurethane foam carrier is impregnated into ceramic slurry A, ceramic slurry A is fully absorbed, passes through rolling forming device
Roll forming, is made idiosome, is strengthened idiosome upper surface and core by getting rid of glaze equipment after idiosome is dried, once by force
Idiosome after change is overturn after drying by tipper, carries out idiosome lower surface and core again by glaze equipment is got rid of
Idiosome after reinforcing, secondary hardening enters next step after drying；Drying temperature is 100~150 DEG C, and drying time is 25
~30min；
Step 3：High temperature sintering
Idiosome by step 2 secondary hardening and after drying, which is put into high temperature sintering furnace, to be sintered, and the sintering period is 2.5
~5h, during sintering preheating section temperature be 200-500 DEG C, low-temperature zone temperature be 500-900 DEG C, high temperature section temperature be 900-1300
DEG C, temperature descending section temperature be 600-300 DEG C, sintering atmosphere control be：Preheating section is oxidizing atmosphere, and high temperature section is weak oxide atmosphere
Or weakly reducing atmosphere.
Embodiment 1
The preparation method of the rare earth foam ceramic filter of the present embodiment, comprises the following steps：
Step 1：Prepare ceramic slurry
Ceramic slurry component, including rare earth, ceramic aggregate and binding agent are weighed by following parts by weight,
The rare earth includes：30 parts of cerium race rare earth, 10 parts of yttrium race rare earth；
The ceramic aggregate includes：15 parts of silicon ash, 15 parts of aluminum oxide, 20 parts of green silicon carbide, 40 parts of black silicon carbide, cellucotton
5 parts；
The binding agent includes：3 parts of polyvinyl alcohol, mass fraction are 40% 10 parts of Ludox；
The rare earth is ground, sieve to obtain the following rare earth powder of 300 mesh, by rare earth powder and ceramic aggregate and bonding
Agent is mixed, and ceramic slurry A is made in the stirring that adds water, and viscosity is 4000CP；The viscous of ceramic slurry B, ceramic slurry B is made in the stirring that adds water
Spend to survey 15~20 seconds using coating -4 viscosity meter；
Gate stirrer is used during stirring, speed of agitator is 60-120r/min；
Step 2：Prepare idiosome
Polyurethane foam carrier is impregnated into ceramic slurry A, ceramic slurry A is fully absorbed, passes through rolling forming device
Roll forming, is made idiosome, is strengthened idiosome upper surface and core by getting rid of glaze equipment after idiosome is dried, once by force
Idiosome after change is overturn after drying by tipper, carries out idiosome lower surface and core again by glaze equipment is got rid of
Idiosome after reinforcing, secondary hardening enters next step after drying；Drying temperature is 100~150 DEG C, and drying time is 25
~30min；
Step 3：High temperature sintering
Idiosome by step 2 secondary hardening and after drying, which is put into high temperature sintering furnace, to be sintered, and the sintering period is 2.5
~5h, during sintering preheating section temperature be 200-500 DEG C, low-temperature zone temperature be 500-900 DEG C, high temperature section temperature be 900-1300
DEG C, temperature descending section temperature be 600-300 DEG C, sintering atmosphere control be：Preheating section is oxidizing atmosphere, and high temperature section is weak oxide atmosphere
Or weakly reducing atmosphere；
Step 4：Surface treatment
Rare earth foam ceramic filter after will be sintered is repaired with the grinding stone of 60-100 mesh, removes unnecessary hair
Thorn.
Embodiment 3
The preparation method of the rare earth foam ceramic filter of the present embodiment, comprises the following steps：
Step 1：Prepare ceramic slurry
Ceramic slurry component, including rare earth, ceramic aggregate and binding agent are weighed by following parts by weight,
The rare earth includes：25 parts of cerium race rare earth, 12 parts of yttrium race rare earth；
The ceramic aggregate includes：12 parts of silicon ash, 18 parts of aluminum oxide, 25 parts of green silicon carbide, 45 parts of black silicon carbide, cellucotton
4 parts；
The binding agent includes：4 parts of polyvinyl alcohol, mass fraction are 40% 8 parts of Ludox；
The rare earth is ground, sieve to obtain the following rare earth powder of 300 mesh, by rare earth powder and ceramic aggregate and bonding
Agent is mixed, and ceramic slurry A is made in the stirring that adds water, and viscosity is 3500CP；The viscous of ceramic slurry B, ceramic slurry B is made in the stirring that adds water
Spend to survey 15~20 seconds using coating -4 viscosity meter；
Gate stirrer is used during stirring, speed of agitator is 60-120r/min；
Step 2：Prepare idiosome
Polyurethane foam carrier is impregnated into ceramic slurry A, ceramic slurry A is fully absorbed, passes through rolling forming device
Roll forming, is made idiosome, is strengthened idiosome upper surface and core by getting rid of glaze equipment after idiosome is dried, once by force
Idiosome after change is overturn after drying by tipper, carries out idiosome lower surface and core again by glaze equipment is got rid of
Idiosome after reinforcing, secondary hardening enters next step after drying；Drying temperature is 100~150 DEG C, and drying time is 25
~30min；
Step 3：High temperature sintering
Idiosome by step 2 secondary hardening and after drying, which is put into high temperature sintering furnace, to be sintered, and the sintering period is 2.5
~5h, during sintering preheating section temperature be 200-500 DEG C, low-temperature zone temperature be 500-900 DEG C, high temperature section temperature be 900-1300
DEG C, temperature descending section temperature be 600-300 DEG C, sintering atmosphere control be：Preheating section is oxidizing atmosphere, and high temperature section is weak oxide atmosphere
Or weakly reducing atmosphere；
Step 4：Surface treatment
Rare earth foam ceramic filter after will be sintered is repaired with the grinding stone of 60-100 mesh, removes unnecessary hair
Thorn.
Claims (6)
1. a kind of preparation method of rare earth foam ceramic filter, it is characterised in that comprise the following steps：
Step 1：Prepare ceramic slurry
Rare earth, ceramic aggregate and binding agent are mixed by weight, be configured to viscosity for 3000~4000CP ceramic slurries A and
Viscosity is the ceramic slurry B surveyed using coating -4 viscosity meter 15~20 seconds；
Step 2：Prepare base substrate
Polyurethane foam carrier is impregnated into ceramic slurry A, ceramic slurry A is fully absorbed, is rolled by rolling forming device
Shaping, be made base substrate, base substrate upper surface and core will be strengthened by getting rid of glaze equipment after body drying, primary reinforcement it
Base substrate afterwards is overturn after drying by tipper, carries out base substrate lower surface and core by force again by glaze equipment is got rid of
Change, next step is entered after the body drying after secondary hardening；
Step 3：High temperature sintering
Base substrate by step 2 secondary hardening and after drying, which is put into high temperature sintering furnace, to be sintered, and obtains rare earth foam ceramics
Filter.
2. the preparation method of rare earth foam ceramic filter according to claim 1, it is characterised in that：
Ceramic slurry component, including rare earth, ceramic aggregate and binding agent are weighed by following parts by weight in step 1,
The rare earth includes：20~30 parts of cerium race rare earth, 10~15 parts of yttrium race rare earth；
The ceramic aggregate includes：10~15 parts of silicon ash, 15~20 parts of aluminum oxide, 20~30 parts of green silicon carbide, black silicon carbide 40
~50 parts, 2~5 parts of cellucotton；
The binding agent includes：3~5 parts of polyvinyl alcohol, mass fraction are 40% 5~10 parts of Ludox；
The rare earth is ground, sieve to obtain the following rare earth powder of 300 mesh, rare earth powder is mixed with ceramic aggregate and binding agent
Close, ceramic slurry A is made in the stirring that adds water, viscosity is 3000~4000CP；Ceramic slurry B is made in the stirring that adds water, ceramic slurry B's
Viscosity is to be surveyed 15~20 seconds using coating -4 viscosity meter.
3. the preparation method of rare earth foam ceramic filter according to claim 2, it is characterised in that：Frame is used during stirring
Formula agitator, speed of agitator is 60-120r/min.
4. the preparation method of rare earth foam ceramic filter according to claim 1, it is characterised in that：
Drying temperature is 100~150 DEG C in the step 2, and drying time is 25~30min.
5. the preparation method of rare earth foam ceramic filter according to claim 1, it is characterised in that：
The sintering period is 2.5~5h in the step 3, during sintering preheating section temperature be 200-500 DEG C, low-temperature zone temperature be 500-
900 DEG C, high temperature section temperature be 900-1300 DEG C, temperature descending section temperature be 600-300 DEG C, sintering atmosphere control is：Preheating section is oxygen
The property changed atmosphere, high temperature section is weak oxide atmosphere or weakly reducing atmosphere.
6. the preparation method of rare earth foam ceramic filter according to claim 1, it is characterised in that：
Including step 4：Surface treatment
Rare earth foam ceramic filter after will be sintered is repaired with the grinding stone of 60-100 mesh, removes unnecessary burr.
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| CN115283658A (en) * | 2018-07-09 | 2022-11-04 | 株式会社普罗吉鲁 | Ceramic filter and method for manufacturing the same |
| CN109336549A (en) * | 2018-09-06 | 2019-02-15 | 湖南银和瓷业有限公司 | Function honeycomb ceramic and its manufacturing method |
| CN109382085A (en) * | 2018-11-13 | 2019-02-26 | 内蒙古科技大学 | Rare Earth Mine foamed ceramics catalyst and its preparation method and application |
| CN110898533B (en) * | 2019-12-02 | 2021-12-10 | 浙江金琨西立锆珠有限公司 | Edge sealing method of foamed ceramic filter for casting |
| CN115350888A (en) * | 2022-07-27 | 2022-11-18 | 晋城市安捷豪铸造材料有限公司 | Foam ceramic filter blank forming process |
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| CN1169752C (en) * | 2000-10-27 | 2004-10-06 | 中国科学院上海硅酸盐研究所 | Method for mfg. high strength, screen like and porous ceramic |
| CN1269771C (en) * | 2003-12-12 | 2006-08-16 | 中国科学院上海硅酸盐研究所 | Mesh porous ceramic preparing method |
| CN102000458B (en) * | 2010-10-19 | 2012-03-21 | 北京航空航天大学 | Yttria foamed ceramic filter and preparation method thereof |
| CN102503533B (en) * | 2011-10-25 | 2013-06-05 | 浙江大学 | Method for preparing silicon carbide honeycomb ceramics |
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