CN111218731B - Sol for preparing alumina fiber and preparation method thereof - Google Patents
Sol for preparing alumina fiber and preparation method thereof Download PDFInfo
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- CN111218731B CN111218731B CN201911370757.9A CN201911370757A CN111218731B CN 111218731 B CN111218731 B CN 111218731B CN 201911370757 A CN201911370757 A CN 201911370757A CN 111218731 B CN111218731 B CN 111218731B
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
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Abstract
The invention provides a preparation method of a sol for preparing alumina fibers, which comprises the following steps: and stirring and mixing the polyaluminum chloride solution, the silica sol, the spinning auxiliary agent and the defoaming agent, and distilling under reduced pressure to obtain the sol for preparing the alumina fiber. The invention selects powdery polyaluminium chloride as an aluminum source for preparing the sol of the alumina fiber. Compared with the method for preparing the sol by using aluminum chloride as the aluminum source, the method for preparing the spinning sol by using the low-cost and cheap inorganic aluminum source suitable for continuous industrial production has the advantages of higher spinnability, better spinning performance and rheological performance and no pollution to the environment. Compared with aluminum sources such as aluminum powder and hydrochloric acid, the method saves energy consumption in the process of producing the aluminum sol, does not need secondary treatment on hydrogen and volatilized acid gas generated in the process of preparing the sol, and has simple and safe process and labor saving.
Description
Technical Field
The invention relates to the technical field of materials, in particular to a sol for preparing alumina fibers and a preparation method thereof.
Background
The alumina fiber is an inorganic fiber with the advantages of high temperature resistance, high mechanical strength, chemical erosion resistance, small thermal conductivity, insulation, noise reduction and the like. Because of its high-temperature heat-insulating property is obvious, it can be extensively used in the fields of various high-temperature furnace linings of metallurgical industry, automobile and spaceflight, etc. Al thereof 2 O 3 The content is more than 67 percent, or other oxides are doped. The preparation method is characterized in that an aluminum source and a silicon source are prepared into a spinning solution by a sol-gel method, and the spinning solution is subjected to a spinning process, a blowing process, a dry extrusion process, an electrostatic spinning process to form fibers, and then the fibers are subjected to high-temperature heat treatment to form a polycrystalline crystalline phase.
When a sol of alumina fibers is prepared by a sol-gel method, the aluminum sources used are classified into organic aluminum sources and inorganic aluminum sources. Organic aluminum sources are most commonly used: aluminum isopropoxide, aluminum acetylacetonate, aluminum acetate, and the like; the organic aluminum source aluminum sol has the main advantages of uniform chemical components, high purity, low temperature of the process, and the like, and has the disadvantages of great influence on preparation conditions, active property of alkyl aluminum alkoxide, influence on spinnability of the sol by water addition, catalyst concentration, reaction time, temperature, and the like, and the organic matter generated in the reaction process pollutes the environment because the alkyl aluminum alkoxide as an aluminum source is expensive. In a word, the cost of the industrial production of the alumina sol prepared by using the organic aluminum source is high, and the reaction process is not easy to control.
The spinnability of the aluminum sol prepared by utilizing inorganic aluminum sources such as aluminum powder, aluminum salt and the like is derived from Al13 colloidal particles contained in the aluminum sol, the Al13 colloidal particles have 24 active-Al-OH bonds, have high positive charges and stronger bridging capacity and are beneficial to forming long-chain molecules with other additives containing hydroxyl groups such as acidic silica sol, and the system has the advantages of low raw material cost, but dangerous hydrogen is generated as a byproduct in the reaction process, and the spinning performance of the sol prepared by simply adopting the aluminum sources such as aluminum chloride, aluminum nitrate and the like is poor, so that the spinning performance and the fiber strength requirements of subsequent fiber forming are not met, and the expected effect of the sol can be achieved by mixing the sol with an organic aluminum source.
Disclosure of Invention
In view of this, the technical problem to be solved by the present invention is to provide a method for preparing a sol for preparing alumina fibers, wherein the sol for preparing alumina fibers prepared by the present invention has the advantages of low cost, safety, no environmental protection problem, and good spinning performance and rheological performance.
The invention provides a preparation method of a sol for preparing alumina fibers, which comprises the following steps:
and stirring and mixing the polyaluminium chloride solution, the silica sol solution, the spinning auxiliary agent and the defoaming agent, and distilling under reduced pressure to obtain the sol for preparing the alumina fiber.
Preferably, the polyaluminium chloride solution is an aqueous solution prepared by dissolving polyaluminium chloride powder in water; the dissolving temperature is 60-120 ℃; the mass concentration of the polyaluminum chloride in the polyaluminum chloride solution is 30-50%.
Preferably, the polyaluminum chloride parameters are specifically as follows: al (Al) 2 O 3 The content of (A) is as follows: 29 to 31 weight percent; basicity: 40 to 65 weight percent; insoluble matter is less than or equal to 0.1wt%; fe 2 O 3 The content of (B) is less than or equal to 0.1wt%.
Preferably, the mass ratio of the alumina in the polyaluminium chloride solution to the silica in the silica sol is 1: (0.1-0.5).
Preferably, the spinning auxiliary agent is selected from one or more of polyvinyl alcohol, polyvinylpyrrolidone, polyethylene glycol and polyvinyl acetate;
the molecular weight of the spinning auxiliary agent is 70000-120000; the alcoholysis degree is more than or equal to 80 percent;
the mass concentration of the spinning auxiliary agent is 5-10%; the solid content of the spinning assistant is 3-9 wt% of the sum of the solid contents of alumina in the polyaluminum chloride solution and silica in the silica sol solution.
Preferably, the reduced pressure distillation temperature is 120-190 ℃; the reduced pressure distillation pressure is-0.080 to 0.090Mpa; the time of the reduced pressure distillation is 1-5 h.
Preferably, the viscosity of the sol for preparing alumina fiber is: 800-1500mpa.s, and the granularity is 50-100 nm; solid content: 30 to 45 weight percent.
Preferably, the defoamer is polydimethylsiloxane; the addition amount of the defoaming agent is one thousandth of the weight of the polyaluminum chloride solution.
The invention provides a sol for preparing alumina fibers, which is prepared by the preparation method of any one of the technical schemes.
The invention provides an alumina fiber which is prepared from the sol for preparing the alumina fiber according to the technical scheme.
Compared with the prior art, the invention provides a preparation method of sol for preparing alumina fiber, which comprises the following steps: and stirring and mixing the polyaluminum chloride solution, the silica sol, the spinning auxiliary agent and the defoaming agent, and distilling under reduced pressure to obtain the sol for preparing the alumina fiber. The invention selects powdery polyaluminum chloride as an aluminum source for preparing the sol of the alumina fiber. Compared with the method for preparing the sol by using aluminum chloride as the aluminum source, the method for preparing the spinning sol by using the low-cost and cheap inorganic aluminum source suitable for continuous industrial production has the advantages of higher spinnability, better spinning performance and rheological performance and no pollution to the environment. Compared with aluminum sources such as aluminum powder and hydrochloric acid, the method saves energy consumption in the process of producing the aluminum sol, does not need secondary treatment on hydrogen and volatile acid gas generated in the sol preparation process, and has simple and safe process and labor saving.
Drawings
FIG. 1 is a diagram of a sol prepared by the method described in example 1 of the present invention;
FIG. 2 is a graph of the rheological properties of the colloid prepared in example 3 of the present invention;
FIG. 3 is a graph of the rheological properties of the colloid prepared in comparative example 1 of the present invention.
Detailed Description
The invention provides a sol for preparing alumina fiber and a preparation method thereof, and a person skilled in the art can use the content for reference and appropriately improve the process parameters to realize the preparation. It is expressly intended that all such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the scope of the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
The invention provides a preparation method of a sol for preparing alumina fibers, which comprises the following steps:
and stirring and mixing the polyaluminum chloride solution, the silica sol, the spinning auxiliary agent and the defoaming agent, and distilling under reduced pressure to obtain the sol for preparing the alumina fiber.
The invention relates to a method for preparing sol for preparing alumina fiber, which firstly prepares polyaluminium chloride solution.
Weighing polyaluminum chloride solution, dissolving in deionized water, heating and stirring to prepare a solution with the mass fraction of 30-50%.
The parameters of the polyaluminium chloride provided by the invention are as follows: high purity Al 2 O 3 The contents of (A) are as follows: 29 to 31 weight percent; basicity: 40 to 65 weight percent; insoluble matter is less than or equal to 0.1wt%; fe 2 O 3 The content of (B) is less than or equal to 0.1wt%.
According to the invention, the polyaluminum chloride solution is an aqueous solution prepared by heating and dissolving polyaluminum chloride powder in water; the preferred dissolving temperature is 60-120 ℃; more preferably from 80 to 110 ℃. The heating and dissolving manner is not limited in the present invention, and it is preferable to heat and continuously stir until the solution is dissolved to be a transparent solution. The present invention is not limited to the specific operation of the stirring, and those skilled in the art will be familiar with the operation.
The mass concentration of the obtained polyaluminum chloride solution is preferably 30-48%; more preferably 35 to 45%.
The presence of hydrogen and acid gases was not detected in the process.
The parameters of the silica sol are as follows: PH is 2-4, granularity: 10-20nm of SiO 2 wt％：15～30％。
The spinning auxiliary agent is prepared into a solution with the mass concentration of 5-10%.
The spinning auxiliary agent is preferably selected from one or more of polyvinyl alcohol, polyvinylpyrrolidone, polyethylene glycol and polyvinyl acetate; more preferably polyvinyl alcohol or polyvinyl pyrrolidone.
The molecular weight of the spinning auxiliary agent is 70000 to 120000; the alcoholysis degree is more than or equal to 80 percent.
The mass concentration of the spinning auxiliary in the spinning auxiliary aqueous solution is preferably 5-10%; more preferably 6% to 8%.
After the polyaluminium chloride solution, the silica sol and the spinning auxiliary agent are prepared, the polyaluminium chloride solution, the silica sol, the spinning auxiliary agent and the defoaming agent are stirred and mixed. The present invention is not limited to the specific operation of the stirring, and those skilled in the art will be familiar with the operation. In the present invention, the source of the raw material is not limited and may be commercially available.
The adding sequence of the polyaluminium chloride solution, the silica sol, the spinning auxiliary agent and the defoaming agent is not limited, and the materials can be added together, or the weighed acidic silica sol, the prepared polyvinyl alcohol solution and the defoaming agent are added into the polyaluminium chloride solution and stirred uniformly.
According to the invention, the mass ratio of alumina in the polyaluminium chloride solution to silica in the silica sol is preferably 1: (0.1 to 0.5); more preferably 1 (0.1 to 0.4).
The solid content of the spinning auxiliary agent is 3-9 wt% of the sum of the solid contents of alumina in the polyaluminium chloride solution and silica in the silica sol; more preferably from 4 to 8wt%.
The defoaming agent is polydimethylsiloxane; the addition amount of the defoaming agent is one thousandth to five thousandth of the weight of the polyaluminium chloride solution.
After stirring and mixing, the mixture was distilled under reduced pressure to obtain a sol for preparing alumina fibers.
The preferable concrete is as follows: after stirring and mixing, carrying out reduced pressure distillation, concentrating and reacting for a period of time until the sol reaches a certain viscosity and granularity, stopping reaction, taking out and pouring into a container, sealing, cooling, aging and storing. The viscosity of the sol for preparing alumina fiber according to the present invention: 800-1500mpa.s, and the granularity is 50-100 nm; solid content: 30 to 45 percent. The sol has a two-dimensional linear structure and good rheological property, and has an irrelevant siphonage phenomenon.
The preferable temperature of the reduced pressure distillation is 120-190 ℃; more preferably 130 to 180 ℃; the reduced pressure distillation pressure is-0.080 to 0.090Mpa; the time of the reduced pressure distillation is 1-5 h.
The apparatus and operation of the vacuum distillation are not limited in the present invention, and those skilled in the art will be familiar with the apparatus and operation.
The invention provides a sol for preparing alumina fibers, which is prepared by the preparation method of any one of the technical schemes.
The preparation method of the sol for preparing alumina fiber according to the present invention is clearly described above, and will not be described herein again.
The invention provides an alumina fiber which is prepared from the sol for preparing the alumina fiber.
The specific method for preparing the alumina fiber is not limited, but the method is characterized in that fibers are formed through a spinning process/a blowing process/a dry extrusion process/an electrostatic spinning process, and a polycrystalline crystal phase is formed through high-temperature heat treatment, which is well known to those skilled in the art, and the raw materials adopt the sol for preparing the alumina fiber or the sol prepared by the preparation method, namely the protection range of the invention.
The invention provides a preparation method of a sol for preparing alumina fibers, which comprises the following steps: and stirring and mixing the polyaluminum chloride solution, the silica sol solution, the spinning auxiliary agent and the defoaming agent, and distilling under reduced pressure to obtain the sol for preparing the alumina fiber. The invention selects powdery polyaluminium chloride as an aluminum source for preparing the sol of the alumina fiber. Compared with the method for preparing the sol by using aluminum chloride as the aluminum source, the method for preparing the spinning sol by using the low-cost and cheap inorganic aluminum source suitable for continuous industrial production has the advantages of higher spinnability, better spinning performance and rheological performance and no environmental pollution. Compared with aluminum sources such as aluminum powder and hydrochloric acid, the method saves energy consumption in the process of producing the aluminum sol, does not need secondary treatment on hydrogen and volatilized acid gas generated in the process of preparing the sol, and has simple and safe process and labor saving.
The method for detecting the escape of hydrogen and acid gas preferably comprises the following steps:
when the polyaluminium chloride is dissolved, the burning matches are close to the kettle mouth of the reaction kettle, and whether the matches are burnt is more vigorous or not is observed, so that the matches are quickly extinguished and the re-burning phenomenon does not occur. After the pH test paper is wetted by ammonia water, the pH test paper is quickly close to the upper part of the liquid level of the polyaluminum chloride solution in the stirring and dissolving process, and the test paper does not discolor (the change from alkalinity to neutrality is not shown).
In order to further illustrate the present invention, a sol for preparing alumina fiber and a method for preparing the same according to the present invention will be described in detail with reference to the following examples.
Example 1
(1) 200kg of polyaluminium chloride powder (the solid content of alumina is 30%) and 400kg of deionized water are weighed, and the polyaluminium chloride powder is slowly added into the deionized water, heated at 95 ℃ and continuously stirred until the polyaluminium chloride powder is dissolved into a transparent solution. The presence of hydrogen and acid gas was not detected in the process.
(2) Weighing 78kg of acidic silica sol (the solid content of the silica is 30%); 2.55kg of polyvinyl alcohol is weighed and dissolved into a solution with the mass fraction of 8% at 90 ℃ for standby.
(3) Adding the weighed acidic silica sol, the prepared polyvinyl alcohol solution and 0.2kg of defoaming agent into a polyaluminum chloride solution, uniformly stirring, carrying out concentration distillation at 150 ℃, keeping the vacuum degree at 0.085Mpa, and reacting for 3 hours to prepare the sol for the alumina fiber, wherein the sol is shown in figure 1.
(4) The colloid is taken out to detect that the temperature is 50 ℃, the average particle size is 60 nm-80 nm, the rheological property is detected to be non-Newtonian fluid, the colloid has a two-dimensional linear structure, is aged for 3 days at constant temperature, has the viscosity of 1900mpa.s, can be spun, and has less slag balls. Can be suitable for preparing alumina fiber. The fiber forming rate was 95.7%.
Example 2
(1) 200kg of polyaluminum chloride powder (the solid content of alumina is 30%) and 400g of deionized water are weighed, and the polyaluminum chloride powder is slowly added into the deionized water, heated at 95 ℃ and continuously stirred until the polyaluminum chloride powder is dissolved into a transparent solution. The presence of hydrogen and acid gases was not detected in the process.
(2) Weighing 50kg of acidic silica sol (the solid content of the silica is 30%); 5.25kg of polyvinyl alcohol is weighed and dissolved into a solution with the mass fraction of 8% at the temperature of 90 ℃ for later use.
(3) Adding the weighed acidic silica sol and the prepared polyvinyl alcohol solution into a polyaluminium chloride solution, uniformly stirring, carrying out concentration distillation at 150 ℃, keeping the vacuum degree at 0.085Mpa, and reacting for 3 hours to prepare the sol for the alumina fiber.
(4) The colloid is taken out to detect that the temperature is 50 ℃, the viscosity is 1100mpa.s, the average particle size is 70-90 nm, the rheological property is detected to be non-Newtonian fluid, the colloid has a two-dimensional linear structure, the colloid is aged for 3 days at constant temperature, the viscosity is 1900mpa.s, and then the colloid can be spun with less slag balls. Can be suitable for preparing alumina fiber. The fiber forming rate is 96.2%.
Example 3
(1) 200kg of polyaluminium chloride powder (the solid content of alumina is 30%) and 400g of deionized water are weighed, and the polyaluminium chloride powder is slowly added into the deionized water, heated at 95 ℃ and continuously stirred until the polyaluminium chloride powder is dissolved into a transparent solution. The presence of hydrogen and acid gas was not detected in the process.
(2) Weighing 50kg of acidic silica sol (the solid content of the silica is 30%); 5.25kg of polyvinyl alcohol is weighed and dissolved into a solution with the mass fraction of 8% at 90 ℃ for later use.
(3) And adding the weighed acidic silica sol and the prepared polyvinyl alcohol solution into a polyaluminium chloride solution, uniformly stirring, carrying out concentration distillation at 180 ℃, keeping the vacuum degree at 0.085Mpa, and reacting for 3.5 hours to prepare the sol for the alumina fiber.
(4) The colloid is taken out to detect that the temperature is 50 ℃, the viscosity is 2150mpa.s, the average particle size is 90 nm-100 nm, the rheological property is detected to be non-Newtonian fluid, the colloid has a two-dimensional linear structure, is aged for 3 days at constant temperature, has the viscosity of 3000mpa.s, and can be spun into fiber, and the number of slag balls is small. Can be suitable for preparing alumina fiber. The fiber forming rate was 95.4%. FIG. 2 is a graph of the rheological properties of the colloid prepared in example 3 of the present invention;
comparative example 1
(1) 200kg of anhydrous aluminum chloride powder (the solid content of alumina is 30%) and 400g of deionized water are weighed, and the anhydrous aluminum chloride powder is slowly added into the deionized water, heated at 95 ℃ and continuously stirred until the anhydrous aluminum chloride powder is dissolved into a transparent solution. The presence of hydrogen and acid gases was not detected in the process.
(2) Weighing 50kg of acidic silica sol (the solid content of the silica is 30%); 5.25kg of polyvinyl alcohol is weighed and dissolved into a solution with the mass fraction of 8% at 90 ℃ for later use.
(3) Adding the weighed acidic silica sol and the prepared polyvinyl alcohol solution into a polyaluminum chloride solution, uniformly stirring, carrying out concentration distillation at 180 ℃, keeping the vacuum degree at 0.085Mpa, and reacting for 3.5 hours to prepare the sol for the alumina fiber.
(4) The colloid is taken out to detect that the temperature is 50 ℃, the viscosity is 1350mpa.s, the average particle size is 40-50 nm, the rheological property is detected to be non-Newtonian fluid, the two-dimensional linear structure is not obvious, the constant-temperature aging is carried out for 3 days, the viscosity is 1600mpa.s, and the wire throwing effect is poor. Is not suitable for preparing alumina fiber. The fiber forming rate is 70.3%. FIG. 3 is a graph of the rheological properties of the colloid prepared in comparative example 1 of the present invention. It can be seen from fig. 2 and fig. 3 that the alumina sol with proper viscosity is more easily prepared by adopting the polyaluminum chloride powder, has obvious shear thinning phenomenon when being subjected to shearing force, the viscosity reduction ratio is about 46%, and the alumina sol is easy to spin into fibers, while the alumina sol prepared by adopting the anhydrous aluminum chloride powder under the same process has smaller viscosity, the raw materials are not beneficial to the generation of a two-dimensional linear structure, the viscosity reduction ratio is 27%, the fibers are not easily spun into fibers, and the fiber forming rate is lower.
Comparative example 2
Aluminum powder, hydrochloric acid and distilled water are mixed according to a molar ratio of 1.8:1:14 the materials are metered in. Hydrochloric acid and distilled water are mixed and heated to 60 ℃. Aluminum powder is added manually, and the adding speed is 20-30%/h of the adding amount. After the addition is finished, the temperature is raised to 105 ℃ to continue the reaction for 3 hours, and the polyaluminum chloride sol is obtained. Avoid machinery to add the aluminite powder and cause and add the mouth and block up because of receiving the vapor, adopt artifical feeding mode, and the reinforced time is longer, increases the amount of labour. The process generates a large amount of hydrogen and volatile acid gas, and needs to be recycled in a centralized way so as to avoid pollution and potential safety hazards. And the open system has a large amount of water volatilization. The polyaluminium chloride powder is directly dissolved into solution, so that the process is simple, safe and environment-friendly, and the waste of materials and energy consumption in industrial production is reduced.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.
Claims (6)
1. A method for preparing a sol for preparing alumina fibers, comprising:
stirring and mixing the polyaluminium chloride solution, the silica sol, the spinning auxiliary agent and the defoaming agent, and distilling under reduced pressure to obtain sol for preparing the alumina fiber; the polyaluminum chloride solution is an aqueous solution prepared by dissolving polyaluminum chloride powder in water; the dissolving temperature is 60-120 ℃; the mass concentration of the polyaluminum chloride in the polyaluminum chloride solution is 30-50%; the spinning auxiliary agent is selected from one or more of polyvinyl alcohol, polyvinylpyrrolidone, polyethylene glycol and polyvinyl acetate; the molecular weight of the spinning auxiliary agent is 70000-120000; the alcoholysis degree is more than or equal to 80 percent; the mass concentration of the spinning auxiliary agent is 5-10%; the solid content of the spinning assistant is 3-9 wt% of the sum of the solid contents of alumina in the polyaluminum chloride solution and silica in the silica sol;
the polyaluminum chloride parameters are specifically as follows: al (Al) 2 O 3 The content of (A) is as follows: 29 to 31 weight percent; basicity: 40 to 65 weight percent; insoluble matter is less than or equal to 0.1wt%; fe 2 O 3 The content of (A) is less than or equal to 0.1wt%;
the mass ratio of the alumina in the polyaluminium chloride solution to the silica in the silica sol is 1: (0.1-0.5).
2. The method according to claim 1, wherein the reduced pressure distillation temperature is 120 to 190 ℃; the reduced pressure distillation pressure is-0.080 to 0.090Mpa; the time of the reduced pressure distillation is 1-5 h.
3. The production method according to claim 1, wherein the viscosity of the sol for producing alumina fibers is: 800-1500mpa.s, granularity of 50-100 nm; solid content: 30 to 45 weight percent.
4. The method of claim 1, wherein the defoaming agent is polydimethylsiloxane; the addition amount of the defoaming agent is one thousandth of the weight of the polyaluminium chloride solution.
5. A sol for producing alumina fibers, characterized by being produced by the production method according to any one of claims 1 to 4.
6. An alumina fiber produced from the sol for producing alumina fiber according to claim 5.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103496724A (en) * | 2013-08-30 | 2014-01-08 | 航天特种材料及工艺技术研究所 | Preparation method of nano alumina sol and gel |
| CN106544757A (en) * | 2016-11-25 | 2017-03-29 | 陕西聚洁瀚化工有限公司 | Get rid of the method that a method prepares polycrystalline alumina fiber |
| CN106757523A (en) * | 2016-11-29 | 2017-05-31 | 陕西盛迈石油有限公司 | The preparation method of polycrystalline mullite fibre |
| CN107778016A (en) * | 2017-11-06 | 2018-03-09 | 陕西盛迈石油有限公司 | The method that alumina sol infusion process prepares alumina fibre |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103496724A (en) * | 2013-08-30 | 2014-01-08 | 航天特种材料及工艺技术研究所 | Preparation method of nano alumina sol and gel |
| CN106544757A (en) * | 2016-11-25 | 2017-03-29 | 陕西聚洁瀚化工有限公司 | Get rid of the method that a method prepares polycrystalline alumina fiber |
| CN106757523A (en) * | 2016-11-29 | 2017-05-31 | 陕西盛迈石油有限公司 | The preparation method of polycrystalline mullite fibre |
| CN107778016A (en) * | 2017-11-06 | 2018-03-09 | 陕西盛迈石油有限公司 | The method that alumina sol infusion process prepares alumina fibre |
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