CN109053181A - A kind of calcium hexaluminate lightweight Materials with High Strength and preparation method thereof - Google Patents
A kind of calcium hexaluminate lightweight Materials with High Strength and preparation method thereof Download PDFInfo
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- CN109053181A CN109053181A CN201810808005.5A CN201810808005A CN109053181A CN 109053181 A CN109053181 A CN 109053181A CN 201810808005 A CN201810808005 A CN 201810808005A CN 109053181 A CN109053181 A CN 109053181A
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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
- 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
- C04B35/44—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 aluminates
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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
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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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
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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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
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Abstract
The invention discloses a kind of calcium hexaluminate lightweight Materials with High Strength and preparation method thereof, belong to fire resisting material field, it solves current calcium hexaluminate high production cost, is unable to large-scale industrial production and use, the problems such as obtained calcium hexaluminate product strength and low yield rate.It is prepared the following steps are included: taking the high-quality silicon source powder of 85-93wt%, and the high-quality calcium source powder of 7-15wt% is added a certain amount of dehydrated alcohol and carries out ball milling, drying using alumina balls as abrasive media；Mixture after drying is heat-treated for the first time under the conditions of 1100 DEG C~1300 DEG C；Enough distilled water is added after cooling, aquation 12~18 hours, rear dry, grinding, compression moulding；Blank is heat-treated for second under the conditions of 1500 DEG C~1600 DEG C after molding, with furnace natural cooling, obtains calcium hexaluminate lightweight Materials with High Strength.This preparation method is low in cost, and apparatus and process is simple, and high yield rate is environmentally protective；Prepared calcium hexaluminate lightweight Materials with High Strength purity is high, bulk density is low, and intensity is high, and performance is stablized.
Description
Technical field
The present invention relates to fire resisting material fields, and in particular to a kind of calcium hexaluminate lightweight Materials with High Strength and preparation method thereof.
Background technique
Calcium hexaluminate, chemical formula CaAl12O19, it is abbreviated as CA6, it is CaO-Al2O3Important compound in binary system
And Al2O3The highest aluminic acid calcium phase of content.CA6Theoretical density be 3.79g/cm3, fusing point reaches 1875 DEG C, with many excellent
Performance: chemical resistance of concrete ability is strong under alkaline environment；Reducing atmosphere stability inferior is high；Dissolution in slag containing iron oxide
It spends low；Thermal expansion coefficient is 8.0 × 10-6℃-1, thermal expansion coefficient (8.6 × 10 with aluminium oxide-6℃-1) close, heat shock resistance
Performance is high.
Currently, there are high production cost for the preparation of calcium hexaluminate, it is unable to large-scale industrial production and use, six obtained
The problems such as calcium aluminate articles intensity and low yield rate.
Authorization Notice No. is that the patent of invention of CN105036167N discloses a kind of utilization industrial alumina powder and aluminate
Cement mixing, balling-up are dried, sintering, the broken method for obtaining calcium hexaluminate material powder.It is raw materials used but in the method
Aluminate cement purity is low, and the impurity contents such as iron, sodium, silicon are higher, can reduce the applied at elevated temperature of calcium hexaluminate material obtained
Energy.
Authorization Notice No. be CN103553101B patent of invention disclose it is a kind of using calcareous raw material, aluminum raw material, water,
Alcohol, amine and alkali are the method that raw material prepares lightweight calcium hexaluminate, and raw material need to be placed in high-temperature kettle and carry out hydro-thermal reaction by the method,
Calcined again after separation of solid and liquid, technical process it is raw materials used it is at high cost, equipment requirement is high, investment is big, production efficiency is low.
Summary of the invention
Small the purpose of the present invention is to solve the deficiencies in the prior art, providing a kind of bulk density, flexural strength is big, hole
Diameter is evenly distributed, the stable calcium hexaluminate material of performance.Production method equipment investment used is small, environmentally protective, yield rate
It is high.
To achieve the above object, the technical scheme adopted by the invention is as follows:
A kind of preparation method of calcium hexaluminate lightweight Materials with High Strength, includes the following steps:
A. ball milling: with 85~93wt% silicon source powder, 7~15wt% calcium source powder is raw material, is added into the raw material certain
The dehydrated alcohol of amount is carried out ball milling using alumina balls as abrasive media, obtains mixture；
B. it dries: the mixture is put into constant temperature blast drying oven, dry 50 under the conditions of 100~120 DEG C of temperature~
80 minutes；
C. be heat-treated for the first time: the mixture after dry is heat-treated for the first time under the conditions of 1100 DEG C~1300 DEG C, described
Heat treatment time is 50~80 minutes, cooling；
D. aquation: the mixture after first time is heat-treated is added to aquation in enough distilled water, the hydration time
It is 12~18 hours；
E. form: gained hydrated product is dried at 100~120 DEG C to moisture evaporating completely, and gained mixture is crushed again,
Grinding, compression moulding；
F. it is heat-treated for second: compression moulding blank being put into Muffle furnace, second under the conditions of 1500 DEG C~1600 DEG C
Secondary heat treatment, heat treatment time is 180~240 minutes, with furnace natural cooling to get calcium hexaluminate lightweight Materials with High Strength.
Source of aluminium is one kind of alpha-alumina or aluminium hydrate powder；The high-quality calcium source is Paris white or hydroxide
One kind of calcium powder.
Preferably, the Al of the alpha-alumina2O3Content >=95wt%, the Al (OH) of the aluminium hydrate powder3Content
>=95wt%.
Preferably, the CaCO of the Paris white3Content >=95wt%, the Ca (OH) of the calcium hydroxide2Content >=
95wt%.The introducing of less impurity can guarantee that obtained product has higher mechanical performance and thermal stability.
Preferably, dehydrated alcohol and the material quality ratio are 2~3:1 in the step 1.The addition of alcohol can be to prevent
Only adherency of the powder on abrading-ball and the aggregation between powder in mechanical milling process.
Preferably, controlling 40~60MPa of compression moulding process pressure in the step 5.
It is as made from above-mentioned preparation method the present invention also provides a kind of calcium hexaluminate material of high-strength light.
The invention has the benefit that
1, in the used preparation method of the present invention selected raw material be heat-treated for the first time and hydration process after obtained water
Changing product is one or more of CAH10, C2AH8, AH3 and C3AH6, in the connection that microcosmic point is three-dimensional structure, energy
Effectively reinforce intergranular effect, be easy to double sintering, the intensity and yield rate of calcium hexaluminate lightweight Materials with High Strength can be promoted.
2, the present invention uses high-quality alpha-alumina, aluminium hydrate powder and Paris white, calcium hydroxide powder for raw material, impurity
Less, prepared calcium hexaluminate lightweight Materials with High Strength purity is high, performance are stablized.
3, the raw material sources that the present invention selects are abundant, low in cost, and preparation process is not necessarily to special equipment and processing technique,
Without noxious gas emission, it is conducive to environmental protection.
Specific embodiment
Combined with specific embodiments below, explanation that the present invention will be further explained.
Embodiment 1
Using the Paris white of the alpha-alumina of 85wt% and 15wt% as raw material, the raw material is added thereto
The dehydrated alcohol of 200wt% uses alumina balls as abrasive media ball milling, obtains mixture；Gained mixture is placed on constant temperature
It is 80 minutes dry at 100 DEG C in air dry oven；Mixture after drying is heat-treated 80 points under the conditions of 1100 DEG C for the first time
Clock is added in enough distilled water, aquation 15 hours after cooling, and hydrated product is dried at 120 DEG C to moisture evaporating completely,
Obtained mixture is crushed again, grinding, the compression moulding at 40MPa；Compression moulding blank is put into Muffle furnace, at 1500 DEG C
Under the conditions of second heat treatment 240 minutes, with furnace natural cooling, obtain calcium hexaluminate lightweight Materials with High Strength.
The bulk density of calcium hexaluminate lightweight Materials with High Strength prepared by the present embodiment is 1.62gcm-3, flexural strength is
12MPa, yield rate 97.7%.
Embodiment 2
Using the calcium hydroxide powder of the alpha-alumina of 93wt% and 7wt% as raw material, the raw material is added thereto
The dehydrated alcohol of 300wt% uses alumina balls as abrasive media ball milling, obtains mixture；Mixture is placed on constant temperature air blast
It is 50 minutes dry at 120 DEG C in drying box；Powder after drying is heat-treated 50 minutes for the first time under the conditions of 1300 DEG C, after cooling
It is added in enough distilled water, hydration time 18 hours；Gained hydrated product is dried at 100 DEG C to moisture evaporating completely,
Obtained mixture is crushed again, grinding, the compression moulding at 60MPa；Compression moulding blank is put into Muffle furnace, at 1600 DEG C
Under the conditions of second heat treatment 180 minutes, with furnace natural cooling, obtain calcium hexaluminate lightweight Materials with High Strength.
The bulk density of calcium hexaluminate lightweight Materials with High Strength prepared by the present embodiment is 1.99gcm-3, flexural strength is
18MPa, yield rate are as follows: 97.5%.
Embodiment 3
Using the Paris white of the aluminium hydrate powder of 89wt% and 11wt% as raw material, the raw material is added thereto
The dehydrated alcohol of 300wt% uses alumina balls as abrasive media ball milling, obtains mixture；Mixture is placed on constant temperature air blast
It is 65 minutes dry at 110 DEG C in drying box；Powder after drying is heat-treated 65 minutes for the first time under the conditions of 1200 DEG C, after cooling
It is added in enough distilled water, hydration time 15 hours, gained hydrated product is dried at 110 DEG C to moisture evaporating completely；
Obtained mixture is crushed again, grinding, the compression moulding at 50MPa；Compression moulding blank is put into Muffle furnace, at 1550 DEG C
Under the conditions of second heat treatment 210 minutes, with furnace natural cooling, obtain calcium hexaluminate lightweight Materials with High Strength.
The bulk density of calcium hexaluminate lightweight Materials with High Strength prepared by the present embodiment is 2.15gcm-3, flexural strength is
16MPa, yield rate are as follows: 98.2%.
Embodiment 4
Using the calcium hydroxide powder of the aluminium hydrate powder of 91wt% and 9wt% as raw material, the raw material is added thereto
The dehydrated alcohol of 300wt% uses alumina balls as abrasive media ball milling, obtains mixture；Mixture is placed on constant temperature air blast
It is 70 minutes dry at 110 DEG C in drying box；Powder after drying is heat-treated 70 minutes for the first time under the conditions of 1200 DEG C；After cooling
It is added in enough distilled water, hydration time 15 hours；Hydrated product is dried at 110 DEG C to moisture evaporating completely, is obtained
Mixture be crushed again, grind, the compression moulding at 50MPa；Compression moulding blank is put into Muffle furnace, in 1600 DEG C of conditions
Lower second of heat treatment 200 minutes, with furnace natural cooling, obtain calcium hexaluminate lightweight Materials with High Strength.
The bulk density of calcium hexaluminate lightweight Materials with High Strength prepared by the present embodiment is 2.06gcm-3, flexural strength is
14MPa, yield rate 98.8%.
Present embodiment has the advantage that compared with prior art
1, in the used preparation method of this specific embodiment selected raw material be heat-treated for the first time and hydration process after
The hydrated product arrived is one or more of CAH10, C2AH8, AH3 and C3AH6, in the connection that microcosmic point is three-dimensional structure
Knot, can effectively reinforce intergranular effect, be easy to double sintering, can promote the intensity and finished product of calcium hexaluminate lightweight Materials with High Strength
Rate.
2, this specific embodiment uses high-quality alpha-alumina, aluminium hydrate powder and Paris white, calcium hydroxide powder for original
Material, impurity is less, and prepared calcium hexaluminate lightweight Materials with High Strength purity is high, performance is stablized.
3, the raw material sources that the present invention selects are abundant, low in cost, and preparation process is not necessarily to special equipment and processing technique,
Without noxious gas emission, it is conducive to environmental protection.
The foregoing is merely preferred embodiments of the invention, are not intended to limit the invention, all on principle of the invention
Made any modification, replacement and improvement etc., should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of preparation method of calcium hexaluminate lightweight Materials with High Strength, which is characterized in that the preparation method comprises the following steps:
A. ball milling: with 85~93wt% silicon source powder, 7~15wt% calcium source powder is raw material, is added into the raw material a certain amount of
Dehydrated alcohol carries out ball milling by abrasive media of alumina balls, obtains mixture；
B. it dries: the mixture is put into constant temperature blast drying oven, it is 50~80 points dry under the conditions of 100~120 DEG C of temperature
Clock；
C. be heat-treated for the first time: the mixture after dry is heat-treated for the first time under the conditions of 1100 DEG C~1300 DEG C, at the heat
Managing the time is 50~80 minutes, cooling；
D. aquation: it will be heat-treated obtained mixture for the first time and be added to aquation in distilled water, the hydration time is 12~18
Hour；
E. it forms: gained hydrated product being dried at 100~120 DEG C to moisture evaporating completely, gained mixture is crushed again, grinds
Mill, compression moulding；
F. it is heat-treated for second: compression moulding blank is put into Muffle furnace, second of heat under the conditions of 1500 DEG C~1600 DEG C
Processing, the heat treatment time is 180~240 minutes, with furnace natural cooling to get calcium hexaluminate lightweight Materials with High Strength.
2. the preparation method of calcium hexaluminate lightweight Materials with High Strength according to claim 1, which is characterized in that source of aluminium powder
For one kind of alpha-alumina or aluminium hydrate powder, the calcium source is one kind of Paris white or calcium hydroxide powder.
3. the preparation method of calcium hexaluminate lightweight Materials with High Strength according to claim 2, which is characterized in that the alpha-oxidation
The Al of aluminium powder2O3Content >=95wt%, the Al (OH) of the aluminium hydrate powder3Content >=95wt%.
4. the preparation method of calcium hexaluminate lightweight Materials with High Strength according to claim 2, which is characterized in that the calcium carbonate
The CaCO of powder3Content >=95wt%, the Ca (OH) of the calcium hydroxide powder2Content >=95wt%.
5. the preparation method of calcium hexaluminate lightweight Materials with High Strength according to claim 1, which is characterized in that the step a
Middle dehydrated alcohol and the material quality ratio are 2~3:1.
6. the preparation method of calcium hexaluminate lightweight Materials with High Strength according to claim 1, which is characterized in that the step e
40~60MPa of middle control compression moulding process pressure.
7. a kind of calcium hexaluminate material of high-strength light, which is characterized in that the calcium hexaluminate lightweight Materials with High Strength is according to power
Benefit requires any one of 1~6 the method to be made.
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| CN201810808005.5A CN109053181A (en) | 2018-07-22 | 2018-07-22 | A kind of calcium hexaluminate lightweight Materials with High Strength and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112374866A (en) * | 2020-03-20 | 2021-02-19 | 湖北中烟工业有限责任公司 | Preparation method of calcium hexaluminate-based ceramic flange |
| CN113336533A (en) * | 2021-06-18 | 2021-09-03 | 华南理工大学 | Calcium hexaluminate ceramic with bioactivity and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112374866A (en) * | 2020-03-20 | 2021-02-19 | 湖北中烟工业有限责任公司 | Preparation method of calcium hexaluminate-based ceramic flange |
| CN112374866B (en) * | 2020-03-20 | 2022-04-29 | 湖北中烟工业有限责任公司 | Preparation method of calcium hexaluminate-based ceramic flange |
| CN113336533A (en) * | 2021-06-18 | 2021-09-03 | 华南理工大学 | Calcium hexaluminate ceramic with bioactivity and preparation method thereof |
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Application publication date: 20181221 |