CN108975948A - A kind of preparation method of foam mullite porous ceramic - Google Patents
A kind of preparation method of foam mullite porous ceramic Download PDFInfo
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- CN108975948A CN108975948A CN201810982871.6A CN201810982871A CN108975948A CN 108975948 A CN108975948 A CN 108975948A CN 201810982871 A CN201810982871 A CN 201810982871A CN 108975948 A CN108975948 A CN 108975948A
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- 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
- C04B38/08—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding porous substances
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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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
- C04B35/185—Mullite 3Al2O3-2SiO2
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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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0006—Honeycomb structures
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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Abstract
The present invention relates to a kind of preparation methods of foam mullite porous ceramic, comprising the following steps: (1) by Modified Protein Earth, Alpha-alumina and sintering aid, is put into agate jar, with planetary ball mill with 2 h of 300rpm ball milling, obtains uniformly mixed powder；Then plus water (2) powder, polyvinyl alcohol, carboxymethyl cellulose, lauryl sodium sulfate, polystyrene and aluminium dihydrogen phosphate are uniformly mixed, are configured to the ceramic material that polystyrene content is 6wt%；(3) by the pressure of 6Mpa by molding, dry demoulding after molding；(4) sinter molding is to get foam mullite porous ceramic.The present invention, collectively as pore creating material, is complementary to one another using modified opal and polystyrene, so that the ceramic material voidage of preparation is high, intensity is high.
Description
Technical field
The present invention relates to a kind of preparation methods of foam mullite porous ceramic, belong to inorganic ceramic material field.
Background technique
Mullite has the low coefficient of expansion, good thermal shock resistance and low thermal conductivity, the machine having had at high temperature
Tool intensity and chemical stability.But to be used as heat-barrier material, it is necessary to further decrease its thermal coefficient.Prepare mullite foam
Ceramics are the methods that thermal coefficient is effectively reduced, with mullite be raw material production foamed ceramics can not only further decrease not come
The thermal conductivity of stone material, and the thermal expansion coefficient of mullite ceramic can be reduced, improve the creep resisting performance of mullite material
And thermal shock resistance, use mullite under the relatively high environment of the thermal shock resistance requirement to material.When foamed ceramics is made
For thermal structure component in application, causing foamed ceramics reheating linear shrinkage ratio to improve due to introducing a large amount of stomatas, loading softening temperature
Degree reduces, high-temerature creep is serious, compressive resistance reduces, so that the use temperature of foamed ceramics be made to be difficult to improve, and makes using model
It encloses and is restricted.Therefore, the mechanical behavior under high temperature and reliability for improving foamed ceramics are also current research hotspot.Di Zhengxian etc.
(preparing the technological factor of mullite foamed ceramics, Materials Science and Engineering journal, 140 phases) is with andalusite: aluminium oxide=8020
For refractory material, pore creating material EPS (partial size < 0.60mm) additional amount 9wt% is calcined at 1450 DEG C, available ideal not next
Stone foamed ceramics, apparent density reach 0.52g/cm3, porosity 83%, flexural strength reach 1.54MPa.This method exist with
Lower problem: using EPS as pore creating material, cause its flexural strength not high, only 1.54MPa.
Summary of the invention
The present invention provides a kind of preparation methods of foam mullite porous ceramic, solve existing foam mullite ceramic
Pore creating material selection is improper, leads to problems such as its flexural strength not high.
In order to solve the above technical problems, the technical solution adopted by the present invention are as follows:
A kind of preparation method of foam mullite porous ceramic, comprising the following steps:
(1) by Modified Protein Earth, Alpha-alumina and sintering aid, be put into agate jar, with planetary ball mill with
300rpm ball milling 2h, obtains uniformly mixed powder；
(2) powder, polyvinyl alcohol, carboxymethyl cellulose, lauryl sodium sulfate, polystyrene and aluminium dihydrogen phosphate are mixed
Then plus water it closes uniformly, is configured to the ceramic material that polystyrene content is 6wt%；
(3) by the pressure of 6Mpa by molding, dry demoulding after molding；
(4) sinter molding is to get foam mullite porous ceramic；
Further, a preferred embodiment of the present invention: the Modified Protein Earth, Alpha-alumina, sintering aid, polyethylene
Alcohol, carboxymethyl cellulose, lauryl sodium sulfate, the weight ratio of polystyrene and aluminium dihydrogen phosphate are as follows: 12:28:2:1.5:1:
1:6-10:14。
Further, a preferred embodiment of the present invention: the Modified Protein Earth the preparation method comprises the following steps: weighing a certain amount of egg
After 600 DEG C of roasting 2h of carclazyte, according to liquid-solid ratio be 3: 1 addition concentration be 40% sulfuric acid, stir evenly, 100 DEG C, reaction 2h, so
After be rinsed with water to no sulfuric acid, it is dry.
Further, a preferred embodiment of the present invention: the sintering aid, in parts by weight, including 40-50 parts long
Stone, 30-40 part kaolin, 5-10 parts of silica, 3-5 parts of titanium dioxides, 0.5-1 parts of lanthanas.
Further, a preferred embodiment of the present invention: the sinter molding specifically: 250 DEG C, 2h, 320 DEG C, 2h；So
It rises to 1600 DEG C of heat preservations afterwards with 5 DEG C/min to be sintered for 4 hours, then furnace cooling.
Beneficial effects of the present invention:
Opoka is also known as opal, is the active silica of a kind of aqueous noncrystalline or colloid, is a kind of amorphous silicon
Matter mineral.Its chemical composition is SiO2.nH2O, wherein institute Si is amorphous structure, and main ingredient also contains small amounts in addition to Si
Iron, aluminium oxide, manganese, copper and organic impurities etc..Opal rock is made of atomic small opal sphere, there is the hole of relatively development
Gap has the features such as porosity is high, and water imbibition is strong, excellent adsorption.By modification, SiO2Content rises to 90% by 79%,
And voidage greatly improves.The gap of mullite ceramic can effectively be improved as pore creating material as major ingredient using opoka
Rate reduces the dosage of binder, and then improves the intensity of product.
Pass through addition sintering aid, the preferred feldspar of sintering aid, kaolin, silica, titanium dioxide and oxygen in the present invention
Change lanthanum, can effectively improve the sintering temperature of mullite ceramic, improve the intensity of foam ceramic material.
The present invention, collectively as pore creating material, is complementary to one another using modified opal and polystyrene, so that the ceramics of preparation
Material void rate is high, and intensity is high.
Mullite ceramic preparation process of the invention is simple, technique is easily controllable, preparation process pollutes small and production cost
Low feature；Prepared mullite porous ceramic intensity is high, open porosity is high.
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical solution of the present invention is clearly and completely described, it is clear that institute
The embodiment of description is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts, belongs to this hair
The range of bright protection.
Embodiment 1
A kind of preparation method of foam mullite porous ceramic, comprising the following steps:
(1) by Modified Protein Earth, Alpha-alumina and sintering aid, be put into agate jar, with planetary ball mill with
300rpm ball milling 2h, obtains uniformly mixed powder；
(2) powder, polyvinyl alcohol, carboxymethyl cellulose, lauryl sodium sulfate, polystyrene and aluminium dihydrogen phosphate are mixed
Then plus water it closes uniformly, is configured to the ceramic material that polystyrene content is 6wt%；
(3) molding, specially a length of 160mm, wide 50mm, the rectangular block of high 40mm, molding are passed through by the pressure of 6Mpa
Dry demoulding afterwards；
(4) sinter molding, the sinter molding specifically: 250 DEG C, 2h, 320 DEG C, 2h；Then it is risen to 5 DEG C/min
1600 DEG C are sintered for heat preservation 4 hours, and then furnace cooling is to get foam mullite porous ceramic；
The Modified Protein Earth, Alpha-alumina, sintering aid, polyvinyl alcohol, carboxymethyl cellulose, dodecyl sulphate
The weight ratio of sodium, polystyrene and aluminium dihydrogen phosphate are as follows: 12:28:2:1.5:1:1:6:14.
The Modified Protein Earth the preparation method comprises the following steps: weighing 600 DEG C of roasting 2h of a certain amount of opoka after, according to liquid-solid ratio
It is 40% sulfuric acid that concentration, which is added, for 3: 1, is stirred evenly, 100 DEG C, and 2h is reacted, and is then rinsed with water to no sulfuric acid, dry.
The sintering aid, in parts by weight, including 40 parts of feldspars, 40 parts of kaolin, 8 parts of silica, 3 parts of titaniums
White powder, 0.8 part of lanthana.
Embodiment 2
A kind of preparation method of foam mullite porous ceramic, comprising the following steps:
(1) by Modified Protein Earth, Alpha-alumina and sintering aid, be put into agate jar, with planetary ball mill with
300rpm ball milling 2h, obtains uniformly mixed powder；
(2) powder, polyvinyl alcohol, carboxymethyl cellulose, lauryl sodium sulfate, polystyrene and aluminium dihydrogen phosphate are mixed
Then plus water it closes uniformly, is configured to the ceramic material that polystyrene content is 6wt%；
(3) molding, specially a length of 160mm, wide 50mm, the rectangular block of high 40mm, molding are passed through by the pressure of 6Mpa
Dry demoulding afterwards；
(4) sinter molding, the sinter molding specifically: 250 DEG C, 2h, 320 DEG C, 2h；Then it is risen to 5 DEG C/min
1600 DEG C are sintered for heat preservation 4 hours, and then furnace cooling is to get foam mullite porous ceramic；
The Modified Protein Earth, Alpha-alumina, sintering aid, polyvinyl alcohol, carboxymethyl cellulose, dodecyl sulphate
The weight ratio of sodium, polystyrene and aluminium dihydrogen phosphate are as follows: 12:28:2:1.5:1:1:8:14.
The Modified Protein Earth the preparation method comprises the following steps: weighing 600 DEG C of roasting 2h of a certain amount of opoka after, according to liquid-solid ratio
It is 40% sulfuric acid that concentration, which is added, for 3: 1, is stirred evenly, 100 DEG C, and 2h is reacted, and is then rinsed with water to no sulfuric acid, dry.
The sintering aid, in parts by weight, including 45 parts of feldspars, 35 parts of kaolin, 5 parts of silica, 4 parts of titaniums
White powder, 0.5 part of lanthana.
Embodiment 3
A kind of preparation method of foam mullite porous ceramic, comprising the following steps:
(1) by Modified Protein Earth, Alpha-alumina and sintering aid, be put into agate jar, with planetary ball mill with
300rpm ball milling 2h, obtains uniformly mixed powder；
(2) powder, polyvinyl alcohol, carboxymethyl cellulose, lauryl sodium sulfate, polystyrene and aluminium dihydrogen phosphate are mixed
Then plus water it closes uniformly, is configured to the ceramic material that polystyrene content is 6wt%；
(3) molding, specially a length of 160mm, wide 50mm, the rectangular block of high 40mm, molding are passed through by the pressure of 6Mpa
Dry demoulding afterwards；
(4) sinter molding, the sinter molding specifically: 250 DEG C, 2h, 320 DEG C, 2h；Then it is risen to 5 DEG C/min
1600 DEG C are sintered for heat preservation 4 hours, and then furnace cooling is to get foam mullite porous ceramic；
The Modified Protein Earth, Alpha-alumina, sintering aid, polyvinyl alcohol, carboxymethyl cellulose, dodecyl sulphate
The weight ratio of sodium, polystyrene and aluminium dihydrogen phosphate are as follows: 12:28:2:1.5:1:1:10:14.
The Modified Protein Earth the preparation method comprises the following steps: weighing 600 DEG C of roasting 2h of a certain amount of opoka after, according to liquid-solid ratio
It is 40% sulfuric acid that concentration, which is added, for 3: 1, is stirred evenly, 100 DEG C, and 2h is reacted, and is then rinsed with water to no sulfuric acid, dry.
The sintering aid, in parts by weight, including 50 parts of feldspars, 30 parts of kaolin, 10 parts of silica, 5 parts
Titanium dioxide, 1 part of lanthana.
Comparative example 1
Substantially the same manner as Example 1, difference is: raw material uses silica, Alpha-alumina, sintering aid, poly- second
Enol, carboxymethyl cellulose, lauryl sodium sulfate, the weight ratio of polystyrene and aluminium dihydrogen phosphate are as follows: 11:29:2:1.5:
1:1:6:14。
Comparative example 2
Substantially the same manner as Example 1, difference is: raw material does not use sintering aid, specially Modified Protein Earth, α-oxygen
Change aluminium, sintering aid, polyvinyl alcohol, carboxymethyl cellulose, lauryl sodium sulfate, the weight of polystyrene and aluminium dihydrogen phosphate
Than are as follows: 13:29:1.5:1:1:6:14.
The performance for measuring embodiment 1-3 and comparative example 1 and 2, specifically see the table below.
| Apparent density g/cm3 | Open porosity/% | Bending strength/(MPa) | |
| Embodiment 1 | 0.86 | 86.2 | 3.12 |
| Embodiment 2 | 0.81 | 85.6 | 3.06 |
| Embodiment 3 | 0.78 | 85.3 | 3.01 |
| Comparative example 1 | 1.12 | 73.2 | 1.76 |
| Comparative example 2 | 0.85 | 82.3 | 2.12 |
As seen from the above table, using opoka and sintering aid of the invention, prepared ceramic material is with higher to be opened
The porosity and bending intensity.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of preparation method of foam mullite porous ceramic, which comprises the following steps:
(1) it by Modified Protein Earth, Alpha-alumina and sintering aid, is put into agate jar, with planetary ball mill with 300rpm
2 h of ball milling, obtains uniformly mixed powder；
(2) powder, polyvinyl alcohol, carboxymethyl cellulose, lauryl sodium sulfate, polystyrene and aluminium dihydrogen phosphate are mixed equal
It is even, then plus water, it is configured to the ceramic material that polystyrene content is 6wt%；
(3) by the pressure of 6Mpa by molding, dry demoulding after molding；
(4) sinter molding is to get foam mullite porous ceramic.
2. a kind of preparation method of foam mullite porous ceramic according to claim 1, it is characterised in that: described changes
Property opoka, Alpha-alumina, sintering aid, polyvinyl alcohol, carboxymethyl cellulose, lauryl sodium sulfate, polystyrene and phosphorus
The weight ratio of acid dihydride aluminium are as follows: 12:28:2:1.5:1:1:6-10:14.
3. a kind of preparation method of foam mullite porous ceramic according to claim 1, it is characterised in that: described changes
Property opoka the preparation method comprises the following steps: weighing 600 DEG C of roasting 2h of a certain amount of opoka after, according to liquid-solid ratio be 3: 1 addition concentration be
40% sulfuric acid, stirs evenly, and 100 DEG C, reacts 2h, is then rinsed with water to no sulfuric acid, dry.
4. a kind of preparation method of foam mullite porous ceramic according to claim 1, it is characterised in that: the burning
Tie auxiliary agent, in parts by weight, including 40-50 parts of feldspars, 30-40 parts of kaolin, 5-10 parts of silica, 3-5 parts of titanium dioxides,
0.5-1 parts of lanthanas.
5. a kind of preparation method of foam mullite porous ceramic according to claim 1, it is characterised in that: the burning
Form type specifically: 250 DEG C, 2h, 320 DEG C, 2h；Then with 5 DEG C/min rise to 1600 DEG C heat preservation 4 hours be sintered, then with
Furnace is cooling.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112408946A (en) * | 2020-11-24 | 2021-02-26 | 天津风烯科技有限责任公司 | Cold sintering preparation method of zero-second quick-heating high-temperature ceramic heating body |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107721448A (en) * | 2017-10-30 | 2018-02-23 | 中钢集团洛阳耐火材料研究院有限公司 | A kind of preparation method of the mullite porous ceramic rich in whisker structure |
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- 2018-08-27 CN CN201810982871.6A patent/CN108975948A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107721448A (en) * | 2017-10-30 | 2018-02-23 | 中钢集团洛阳耐火材料研究院有限公司 | A kind of preparation method of the mullite porous ceramic rich in whisker structure |
Non-Patent Citations (1)
| Title |
|---|
| 陈俊涛: "蛋白土提纯对其理化性能的影响研究", 《人工晶体学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112408946A (en) * | 2020-11-24 | 2021-02-26 | 天津风烯科技有限责任公司 | Cold sintering preparation method of zero-second quick-heating high-temperature ceramic heating body |
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Application publication date: 20181211 |