CN108285358A - The expansion material increasing method of pore diameter of porous ceramics - Google Patents
The expansion material increasing method of pore diameter of porous ceramics Download PDFInfo
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- CN108285358A CN108285358A CN201711347152.9A CN201711347152A CN108285358A CN 108285358 A CN108285358 A CN 108285358A CN 201711347152 A CN201711347152 A CN 201711347152A CN 108285358 A CN108285358 A CN 108285358A
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- expansion material
- porous ceramics
- pore diameter
- increasing method
- expansion
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/195—Alkaline earth aluminosilicates, e.g. cordierite or anorthite
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3201—Alkali metal oxides or oxide-forming salts thereof
- C04B2235/3203—Lithium oxide or oxide-forming salts thereof
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
- C04B2235/3472—Alkali metal alumino-silicates other than clay, e.g. spodumene, alkali feldspars such as albite or orthoclase, micas such as muscovite, zeolites such as natrolite
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
Abstract
The invention discloses a kind of expansion material increasing method of pore diameter of porous ceramics, be added in porous ceramics dispensing heating undergo phase transition or solid phase reaction after the increased expansion material of volume, in porous ceramics high temperature firing, big, the increase porosity is supportted in gap by expansion material expansion.The expansion material increasing method of pore diameter of porous ceramics of the present invention, stomata can be increased in sintering procedure, the present invention does not change the preparation process of original porous ceramics, only increases a certain amount of expansion material in dispensing, has many advantages, such as that adjustment is simple, easy to operate, applied widely.
Description
Technical field
The present invention relates to a kind of porous ceramics increase the porosity method, and in particular to it is a kind of with expansion material pyroreaction or
Volume increases and increases the method for porous ceramics stomata after phase transformation.
Background technology
Porous ceramics is also known as stomata function ceramics, micropore ceramics, foamed ceramics etc., and being one kind having certain size sum number
Measure the new ceramic material of stomata.In material forming and high-temperature sintering process, inside formation is largely communicated with each other or is closed
Stomata.Porous ceramics has equally distributed micropore or hole, and porosity is compared with high, bulk density is small, specific surface is larger and unique
Physical surface properties, to the selectable permeability of liquids and gases medium, energy absorption or damping characteristic, and as ceramics
The distinctive high temperature resistant of material, corrosion-resistant, high chemical stability and dimensional stability, to its application opened up it is wide before
Scape.Porous ceramic film material is widely used in oil, chemical industry, aerospace, biology, metallurgy, machinery, the energy, electronics, mine, medicine, ring
The industries such as guarantor, as filtering, separation, gas distribution, sound-absorbing, sensitive material and diaphragm, bioceramic and catalyst carrier, extraordinary wall
Material and sensor material etc..
The technology of preparing of porous ceramics is critically important, and structure and performance are all controlled by its preparation process.With
Porous ceramics research is goed deep into, and the method for preparing porous ceramics is also more and more abundant.There are commonly extrinsion pressing, foaming,
Pore creating material method, sol-gel method, Polymeric sponge method, new development have self-propagating high-temperature synthesis, supercritical drying,
Lyophilization method, in-situ reaction, phase transformation pore-creating, anodizing, etch, molecular link pore-forming etc. be not 20 kinds lower.These
The each have their own characteristic of method is suitable for preparing different types of porous ceramics, is used for different use occasions.
When porous ceramics dispensing is shaped to powder granule the green body of definite shape, after being heated to certain temperature, in green body
Particle will start interact and shrink, stomata gradually tapers up, and the required porosity gradually decreases.So porous ceramics exists
It needs to solve the problems, such as that the reduction porosity is shunk in firing in sintering process.
Invention content
The purpose of the present invention is to provide a kind of expansion material increasing method of pore diameter of porous ceramics, can increase in sintering procedure
Stomata, the present invention do not change the preparation process of original porous ceramics, only increase a certain amount of expansion material in dispensing, have and adjust
The advantages that whole simple, easy to operate, applied widely.
To achieve the above object, the technical scheme is to design a kind of expansion material increasing method of pore diameter of porous ceramics,
Be added in porous ceramics dispensing heating undergo phase transition or solid phase reaction after the increased expansion of volume expect, in porous ceramics high temperature firing
When, gap is supportted greatly, increases the porosity by expansion material expansion.
Preferably, the expansion material is the particulate material being added in dispensing.
Preferably, the dosage of the expansion material is the 0.1%~40% of porous ceramics dispensing total amount.
Preferably, the dosage of the expansion material is the 13%~25% of porous ceramics dispensing total amount.
Preferably, the expansion material is the increased particulate material of volume after pyroreaction, including kyanite.
Preferably, the expansion material is the increased particulate material of volume after high-temperature phase-change, including spodumene.
Preferably, according to the type and ratio that expansion material is added, calcining system is done suitably modified.
The advantages of the present invention are：A kind of expansion material increasing method of pore diameter of porous ceramics is provided, can burnt
Increase stomata during system, the present invention does not change the preparation process of original porous ceramics, only increases in dispensing a certain amount of
Expansion material has many advantages, such as that adjustment is simple, easy to operate, applied widely.
When porous ceramics dispensing is shaped to powder granule the green body of definite shape, after being heated to certain temperature, in green body
Particle start interact and shrink, stomata gradually tapers up, and the porosity gradually decreases.The present invention is added 0.1% in dispensing~
40% expansion material, expansion material undergo phase transition when heated or solid phase reaction after volume can increase, the particle of contraction can be strutted,
It solves the problems, such as that green body is shunk and reduces the porosity, play the purpose for increasing the porosity.
Specific implementation mode
With reference to embodiment, the specific embodiment of the present invention is further described.Following embodiment is only used for more
Add and clearly demonstrate technical scheme of the present invention, and not intended to limit the protection scope of the present invention.
The technical solution that the present invention embodies is：
Embodiment 1
On porous cordierite ceramics basic components, addition accounts for the kyanite of dispensing total amount 18%, kyanite decomposition temperature it
On, select the suitable temperature, calcining system to be：40℃ 2h 800℃（6℃/min） 1.5h 1340℃（5-6℃/min）, heat preservation
30min, furnace cooling.Contrast experiment is carried out to addition kyanite and without adding the porous ceramics sample of kyanite, comparison is surveyed
The parameters such as percent of firing shrinkage, the porosity, flexural strength are tried, the results are shown in Table 1.
Table 1
The porous ceramics sample without adding kyanite is compared, after addition accounts for the kyanite of dispensing total amount 18%, percent of firing shrinkage subtracts
Small, the porosity increases, and flexural strength reduces but meets requirement.
Embodiment 2
On porous cordierite ceramics basic components, addition accounts for the kyanite of dispensing total amount 25%, kyanite decomposition temperature it
On, select the suitable temperature, calcining system to be：40℃ 2h 800℃（6℃/min） 1.5h 1360℃（5-6℃/min）, heat preservation
30min, furnace cooling.Contrast experiment is carried out to addition kyanite and without adding the porous ceramics sample of kyanite, comparison is surveyed
The parameters such as percent of firing shrinkage, the porosity, flexural strength are tried, the results are shown in Table 2.
Table 2
The porous ceramics sample without adding kyanite is compared, after addition accounts for the kyanite of dispensing total amount 25%, percent of firing shrinkage subtracts
Small, the porosity increases, and flexural strength reduces but meets requirement.
Embodiment 3
On porous cordierite ceramics basic components, addition accounts for the spodumene of dispensing total amount 13%, because the addition of spodumene has reduction
The effect of firing temperature, therefore need to reduce the firing temperature of original formula, the calcining system after adjustment is：40℃ 2h 800℃（6
℃/min） 1.5h 1310℃（5-6℃/min）, keep the temperature 30min, furnace cooling.To addition spodumene and without addition spodumene
Porous ceramics sample carries out contrast experiment, and the parameters such as contrast test percent of firing shrinkage, the porosity, flexural strength the results are shown in Table 3.
Table 3
The porous ceramics sample without adding spodumene is compared, after addition accounts for the spodumene of dispensing total amount 13%, percent of firing shrinkage subtracts
Small, the porosity increases, and flexural strength reduces but meets requirement.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvements and modifications can also be made, these improvements and modifications
Also it should be regarded as protection scope of the present invention.
Claims (8)
1. the expansion material increasing method of pore diameter of porous ceramics, which is characterized in that in porous ceramics dispensing be added heating undergo phase transition or
The increased expansion material of volume after solid phase reaction, in porous ceramics high temperature firing, expansion material expansion is big by gap support, increases gas
Porosity.
2. the expansion material increasing method of pore diameter of porous ceramics according to claim 1, which is characterized in that expansion material for
The particulate material being added when material.
3. the expansion material increasing method of pore diameter of porous ceramics according to claim 1, which is characterized in that the dosage of the expansion material
It is the 0.1%~40% of porous ceramics dispensing total amount.
4. the expansion material increasing method of pore diameter of porous ceramics according to claim 1, which is characterized in that the expansion material is high temperature
The increased particulate material of volume after reaction.
5. the expansion material increasing method of pore diameter of porous ceramics according to claim 4, which is characterized in that the expansion material is aquamaine
Stone.
6. the expansion material increasing method of pore diameter of porous ceramics according to claim 1, which is characterized in that the expansion material is high temperature
The increased particulate material of volume after phase transformation.
7. the expansion material increasing method of pore diameter of porous ceramics according to claim 6, which is characterized in that the expansion material is lithium brightness
Stone.
8. the expansion material increasing method of pore diameter of porous ceramics according to claim 1, which is characterized in that expand material according to being added
Type and ratio are done calcining system suitably modified.
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| CN201711347152.9A CN108285358A (en) | 2017-12-15 | 2017-12-15 | The expansion material increasing method of pore diameter of porous ceramics |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115231944A (en) * | 2022-08-11 | 2022-10-25 | 西北工业大学 | Low-shrinkage mullite-based porous ceramic and preparation method thereof |
Citations (3)
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|---|---|---|---|---|
| CN103693974A (en) * | 2013-12-02 | 2014-04-02 | 武汉钢铁(集团)公司 | Lightweight heat-insulating fire brick and preparation method thereof |
| WO2016037316A1 (en) * | 2014-09-09 | 2016-03-17 | 南京工业大学 | Preparation method of sic porous ceramic material and porous ceramic material manufactured by using same |
| CN107056324A (en) * | 2015-06-19 | 2017-08-18 | 徐荣浛 | A kind of anorthite lightweight thermal insulation brick and preparation method thereof |
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2017
- 2017-12-15 CN CN201711347152.9A patent/CN108285358A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103693974A (en) * | 2013-12-02 | 2014-04-02 | 武汉钢铁(集团)公司 | Lightweight heat-insulating fire brick and preparation method thereof |
| WO2016037316A1 (en) * | 2014-09-09 | 2016-03-17 | 南京工业大学 | Preparation method of sic porous ceramic material and porous ceramic material manufactured by using same |
| CN107056324A (en) * | 2015-06-19 | 2017-08-18 | 徐荣浛 | A kind of anorthite lightweight thermal insulation brick and preparation method thereof |
Non-Patent Citations (1)
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| 罗民华等: "锂辉石对堇青石多孔陶瓷性能的影响", 《中国陶瓷》 * |
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|---|---|---|---|---|
| CN115231944A (en) * | 2022-08-11 | 2022-10-25 | 西北工业大学 | Low-shrinkage mullite-based porous ceramic and preparation method thereof |
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Application publication date: 20180717 |