CN115196941A - Preparation method of inorganic polymer prepreg and composite material prepared by using inorganic polymer prepreg - Google Patents
Preparation method of inorganic polymer prepreg and composite material prepared by using inorganic polymer prepreg Download PDFInfo
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- CN115196941A CN115196941A CN202210861949.5A CN202210861949A CN115196941A CN 115196941 A CN115196941 A CN 115196941A CN 202210861949 A CN202210861949 A CN 202210861949A CN 115196941 A CN115196941 A CN 115196941A
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/34—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
- C04B28/342—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders the phosphate binder being present in the starting composition as a mixture of free acid and one or more reactive oxides
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses a preparation method of an inorganic polymer prepreg and a composite material prepared by applying the inorganic polymer prepreg, and aims to solve the problems that the existing ceramic matrix composite material is complex in preparation process, difficult to produce automatically and poor in performance stability of a finished product material. The preparation method comprises the following steps: 1. adding a phosphorus source and an aluminum source into a solvent, uniformly mixing, and adding a modifier to obtain an inorganic polymer glue solution; 2. pretreating a fiber reinforcement; 3. adding a curing agent into the inorganic polymer glue solution, and performing ball milling and uniform mixing to obtain inorganic polymer slurry; 4. and pouring the inorganic polymer slurry into a dipping tank, drawing the pretreated fiber reinforcement to dip through the dipping tank, and drying to obtain the inorganic polymer prepreg. The invention utilizes the characteristic that the prepared inorganic polymer slurry is crosslinked, filmed and semi-cured at room temperature to prepare the novel ceramic prepreg, is compatible with the automatic tape laying and automatic silk laying process of the prior resin-based composite material, and can realize the automatic production and low-temperature and low-cost preparation of the large-size composite material with a complex shape.
Description
Technical Field
The invention belongs to the field of composite materials, and particularly relates to a preparation method for preparing a high-temperature service inorganic polymer prepreg at a low temperature and a composite material prepared by applying the prepreg.
Background
The continuous fiber reinforced composite material has excellent performances of high specific strength, high specific modulus, fatigue resistance, corrosion resistance and the like, and is widely applied to the fields of aerospace, automobiles, buildings, energy sources, chemical industry and the like. For example, in a boeing 787 airliner, the amount of composite material used can be more than 50%. However, the resin-based composite material which is mature in process and widely applied at present is difficult to meet the service requirement under severe environment due to the defects of poor high-temperature resistance, high-temperature aging tendency, flammability, low matrix hardness, high abrasion tendency and the like, and the ceramic-based composite material is widely concerned with the advantages of excellent high-temperature performance, high hardness, high environmental stability and the like, and is applied to the fields of high-speed aircraft thermal protection, aircraft engines, commercial aircraft fire prevention, automobile internal combustion engines and the like instead of the resin-based composite material. The preparation method of the continuous fiber reinforced ceramic matrix composite mainly comprises a precursor impregnation cracking method, a slurry impregnation sintering method, a reaction infiltration method and a chemical vapor infiltration method, and the preparation process not only needs higher sintering temperature, but also has long preparation period, complex process equipment and high cost, and greatly limits the large-scale application of the composite.
The inorganic polymer is a novel ceramic material which can be cured and prepared at a lower temperature (within 400 ℃), can keep stable and high performance at 1000-1800 ℃, has the potential of low-cost low-temperature preparation and high-performance high-temperature use, and is widely concerned. However, at present, when the ceramic matrix composite is prepared by taking the ceramic matrix composite as a matrix, a preparation mode of the ceramic matrix composite is still used, most of the ceramic matrix composite is prepared and molded by adopting a slurry dipping and sintering mode or a manual hand pasting layer laying mode, the composite preparation process is complex, the waste of the matrix slurry is great after dipping for many times, the oversized molding is difficult, the automatic production is difficult, and the like, and in addition, the problems of poor performance stability of a finished product material and the like caused by the manual hand pasting process are also faced, so that the large-scale practical application of the ceramic matrix composite is limited to a great extent.
Disclosure of Invention
The invention aims to solve the problems of complex preparation process, high cost, difficult automatic production and poor performance stability of finished materials of the existing ceramic matrix composite, and provides a preparation method of an inorganic polymer prepreg and a composite prepared by using the inorganic polymer prepreg.
The preparation method of the inorganic polymer prepreg is realized according to the following steps:
1. preparing inorganic polymer glue solution:
according to the molar ratio of phosphorus to aluminum being 1-8: 1 adding a phosphorus source and an aluminum source into a solvent, uniformly mixing to obtain a mixed solution, then adding a modifier accounting for 0.02-2 wt% of the mixed solution, continuously stirring at 50-150 ℃, and cooling to obtain an inorganic polymer glue solution;
2. pretreatment of the fiber reinforcement:
pretreating the fiber reinforcement to obtain a pretreated fiber reinforcement;
3. preparation of inorganic polymer slurry:
adding a curing agent accounting for 15-50% of the mass of the glue solution into the inorganic polymer glue solution, and performing ball milling and uniform mixing to obtain inorganic polymer slurry;
4. preparing a fiber prepreg:
pouring inorganic polymer slurry into a dipping tank, drawing the pretreated fiber reinforcement to dip through the dipping tank, and drying and cooling to obtain an inorganic polymer prepreg (sheet);
wherein the phosphorus source in the step one is phosphoric acid or phosphorus pentoxide, and the aluminum source is aluminum hydroxide, aluminum nitrate, aluminum chloride or metal alkoxide of aluminum; the modifier is one or more of zinc oxide, magnesium oxide, chromium oxide, boron oxide, calcium oxide, chromium hydroxide, calcium hydroxide and magnesium hydroxide; the curing agent is one or a mixture of more of molybdenum disilicide, hafnium disilicide, silicon oxide, aluminum oxide, silicon nitride, aluminum nitride, boron nitride, silicon carbide, hafnium carbide and tantalum carbide.
The addition of the modifier can ensure that after the slurry is dried and dehydrated, the surface of the slurry is crosslinked to form a compact and tough film to prevent further volatilization of an internal solvent, the slurry is in a semi-solidified state at room temperature, the surface of the slurry is not sticky, and the strength and toughness of the slurry are certain, so that the setting and storage of a prepreg sheet are facilitated, and on the other hand, when the slurry after film forming is processed at 60-120 ℃, internal moisture is diffused to the surface, so that the crosslinked molecular chain is partially hydrolyzed, the molecular chain is easy to move when the temperature is raised, and the slurry has high plasticity, is compatible with an automatic tape laying and silk laying instrument, and realizes the molding of the prepreg. The selected curing agent does not react with the mixed solution at room temperature, so that the slurry is in a semi-cured state at room temperature and starts to react at the temperature of more than 300 ℃ and the slurry curing and ceramic process is promoted, so that the low-temperature curing of the prepreg is compatible with various resin-based composite material curing means such as autoclave, mould pressing and the like, and the low-temperature curing and high-temperature service of the composite material is realized.
The method for preparing the composite material by using the inorganic polymer prepreg is realized by the following steps:
and laying the inorganic polymer prepreg, heating, pressurizing, molding and curing to obtain the inorganic polymer composite material.
The invention utilizes the characteristic that the prepared inorganic polymer slurry is crosslinked, filmed and semi-cured at room temperature to prepare a novel ceramic prepreg, is compatible with the automatic tape laying and automatic filament laying process of the existing resin-based composite material, and can realize large-size complex-shape automatic production. In particular, the prepreg prepared by the invention only needs to be stored in a sealing way, the storage condition is simple and similar to that of the resin matrix composite prepreg, and the prepreg can be stored for more than two years and has stable performance.
The invention effectively solves the disadvantages of complex preparation process, waste of raw materials, long preparation period, high cost and the like in the prior art, and has important significance for quick low-cost preparation of inorganic polymer matrix composite materials and popularization and application in the commercial field.
Drawings
FIG. 1 is a schematic diagram of a preparation process of an inorganic polymer prepreg according to the present invention, wherein 1 represents a cloth releasing roller, 2 represents a cloth storing device, 3 represents a front traction roller, 4 represents a glue dipping tank, 5 represents a glue extruding roller, 6 represents a pre-curing furnace, 7 represents a rear traction roller, 8 represents a PE film or release paper releasing, and 9 represents a prepreg winding roller;
FIG. 2 is a graph showing the dielectric constant of the composite laminate at three different positions according to the first embodiment;
FIG. 3 is a graph showing the dielectric loss test of the composite laminate at three different positions according to the first embodiment;
FIG. 4 is a composite material microtopography obtained by the application example II;
FIG. 5 is a macro-topographic map of the inorganic polymer prepreg obtained in example two.
Detailed Description
The first specific implementation way is as follows: the preparation method of the inorganic polymer prepreg of the embodiment is implemented by the following steps:
1. preparing inorganic polymer glue solution:
according to the molar ratio of phosphorus to aluminum being 1-8: 1 adding a phosphorus source and an aluminum source into a solvent, uniformly mixing to obtain a mixed solution, then adding a modifier which accounts for 0.02-2 wt% of the mixed solution, continuously stirring at 50-150 ℃, and cooling to obtain an inorganic polymer glue solution;
2. pretreatment of the fiber reinforcement:
pretreating the fiber reinforcement to obtain a pretreated fiber reinforcement;
3. preparation of inorganic polymer slurry:
adding a curing agent accounting for 15-50% of the mass of the glue solution into the inorganic polymer glue solution, and performing ball milling and uniform mixing to obtain inorganic polymer slurry;
4. preparing a fiber prepreg:
pouring inorganic polymer slurry into a dipping tank, drawing the pretreated fiber reinforcement to dip through the dipping tank, and drying and cooling to obtain an inorganic polymer prepreg (sheet);
the phosphorus source in the step one is phosphoric acid or phosphorus pentoxide, and the aluminum source is aluminum hydroxide, aluminum nitrate, aluminum chloride or aluminum metal alkoxide; the modifier is one or more of zinc oxide, magnesium oxide, chromium oxide, boron oxide, calcium oxide, chromium hydroxide, calcium hydroxide and magnesium hydroxide; the curing agent is one or a mixture of more of molybdenum disilicide, hafnium disilicide, silicon oxide, aluminum oxide, silicon nitride, aluminum nitride, boron nitride, silicon carbide, hafnium carbide and tantalum carbide.
The modifier of the embodiment can also be dissolved in methanol or ethanol and then added into the mixed solution.
The second fiber treatment process in the present embodiment may be completed before the prepreg is prepared, or may be completed simultaneously with the preparation of the prepreg by adding the fiber treatment device between the front pulling roll and the dip tank in the process flow shown in fig. 1. As shown in fig. 1, the fiber reinforcement is subjected to gum dipping treatment in a gum dipping tank under the action of a traction roller, then is precured in a precuring furnace, and is wound after a PE film or release paper is attached.
The embodiment provides the inorganic polymer prepreg capable of combining automatic tape laying and automatic silk laying processes and the preparation method of the composite material thereof by utilizing the characteristics of low-temperature pre-curing and high-temperature treatment subsequent curing of the inorganic polymer slurry, thereby realizing low-cost low-temperature automatic preparation of the high-temperature-resistant inorganic polymer matrix composite material.
The second embodiment is as follows: the difference between the present embodiment and the first embodiment is that the solvent in the first step is one or more mixed solvents of methanol, ethanol, propanol and deionized water.
The third concrete implementation mode: the difference between the first embodiment and the second embodiment is that the modifier accounting for 0.03-1 wt% of the mixed solution is added in the first step.
The fourth concrete implementation mode is as follows: the difference between the present embodiment and one of the first to third embodiments is that in the first step, the curing agent is a mixture of alumina and silica in a mass ratio of 3.
The fifth concrete implementation mode: this embodiment is different from one of the first to fourth embodiments in that the fiber reinforcement in the second step is a two-dimensional fabric or fiber mat of carbon fibers, quartz fibers, glass fibers, alumina fibers, silicon nitride fibers, boron nitride fibers, mullite fibers, boron fibers, organic resin fibers.
The sixth specific implementation mode is as follows: the present embodiment is different from one of the first to fifth embodiments in that the pretreatment in the second step is a heat treatment, an anodic oxidation treatment, an acid-base etching treatment, or a surface treatment agent immersion treatment.
The seventh embodiment: this embodiment is different from the sixth embodiment in that the heat treatment is performed at a temperature of 300 to 1500 ℃ in an oxygen, nitrogen, or argon atmosphere.
The heat treatment of the embodiment mainly removes the wetting agent on the fiber surface, oxygen-containing groups can be obtained on the fiber surface by the treatment in an oxygen atmosphere, and carbon can be decomposed on the fiber surface in a layer under the argon and nitrogen conditions, so that the method is a fiber surface treatment mode.
The specific implementation mode is eight: the difference between the present embodiment and one of the first to seventh embodiments is that the traction speed is controlled to be 0.2 to 10m/min in the fourth step.
The content of the prepreg matrix is controlled by adjusting the roller knife spacing of the rubber roller to be 0.05-1 mm, then partial moisture is dried at 25-100 ℃, finally the composite PE film or release paper is cooled and wound to obtain the inorganic polymer prepreg, and the prepreg is stored by using an impermeable sealing bag.
The specific implementation method nine: the method for preparing the composite material by using the inorganic polymer prepreg is realized by the following steps: and laying the inorganic polymer prepreg, heating, pressurizing, molding and curing to obtain the inorganic polymer composite material.
The laying temperature of the inorganic polymer prepreg in the embodiment is 60-120 ℃.
The detailed implementation mode is ten: the difference between this embodiment and the ninth embodiment is that an automatic tape laying machine or an automatic filament laying machine is used to cut and lay the inorganic polymer prepreg.
The concrete implementation mode eleven: the difference between this embodiment and the ninth embodiment is that autoclave, vacuum bag or compression molding is adopted for curing.
The specific implementation mode twelve: the difference between the ninth embodiment and the eleventh embodiment is that the curing process is to heat the mixture to 300-500 ℃ at a speed of 0.1-5 ℃/min and keep the temperature for 2-48 h, and a pressure of 0.05-5 MPa is applied in the curing process.
The specific implementation mode thirteen: this embodiment differs from the ninth embodiment in that the curing process is carried out in an inert atmosphere (nitrogen or argon).
The first embodiment is as follows: the preparation method of the inorganic polymer prepreg of the embodiment is implemented by the following steps:
1. preparing inorganic polymer glue solution:
according to the mole ratio of phosphorus to aluminum of 4.1: adding a phosphorus source and an aluminum source into deionized water, uniformly mixing and clarifying at 120 ℃ to obtain a mixed solution with the solute content of 55wt%, then adding a modifier accounting for 0.05wt% of the mixed solution, stirring at 130 ℃, clarifying, cooling to room temperature, and adopting a condenser reflux device in the high-temperature stirring process to obtain an inorganic polymer glue solution;
2. pretreatment of the fiber reinforcement:
treating the quartz fiber two-dimensional plain weave fabric reinforcement body for 0.5h at 600 ℃ in an air atmosphere to obtain a pretreated fiber reinforcement body;
3. preparation of inorganic polymer slurry:
adding an alumina curing agent accounting for 50wt% of the glue solution into the inorganic polymer glue solution, and performing ball milling and uniform mixing to obtain inorganic polymer slurry;
4. preparing a fiber prepreg:
pouring inorganic polymer slurry into a dipping groove, drawing the pretreated fiber reinforcement in the second step at a drawing speed of 2m/min to dip through the dipping groove, adjusting the distance between rollers of a rubber roller to be 0.15mm, drying partial moisture at 80 ℃, cooling a composite PE film or release paper, and rolling to obtain an inorganic polymer prepreg, wherein the prepreg is stored by using an impermeable sealing bag;
wherein the phosphorus source of step one is phosphoric acid; the aluminum source is aluminum hydroxide, and the modifier is a mixture of chromium oxide and methanol according to a mass ratio of 1.
The first application embodiment: the method for preparing the composite material by using the inorganic polymer prepreg is realized by the following steps:
the inorganic polymer prepreg is manually cut and laid according to the shape of 80cm multiplied by 2cm, the prepreg is cut and laid, compression molding and curing are carried out, the curing process is to heat up to 300 ℃ at the speed of 0.1 ℃/min and keep the temperature for 4h, pressure is applied at the temperature of 60 ℃ in the curing process, the pressure is 3MPa, a composite material blank is obtained, and the composite material blank is cut and machined, so that the composite material laminated plate is obtained.
The composite material laminated plate obtained by the embodiment has tensile strength of 40MPa and bending strength of 125MPa, has good dielectric property, can be used as a high-temperature wave-transmitting material, and has dielectric constants and dielectric losses at three positions of the flat plate under different electromagnetic wave frequencies at room temperature as shown in fig. 2 and fig. 3.
The second embodiment: the preparation method of the inorganic polymer prepreg of the embodiment is implemented according to the following steps:
1. preparing inorganic polymer glue solution:
according to the molar ratio of phosphorus to aluminum of 5:1 adding a phosphorus source and an aluminum source into deionized water, uniformly mixing and clarifying at 120 ℃ to obtain a mixed solution with the solute content of 47.6wt%, then adding a zinc oxide modifier accounting for 0.03wt% of the mixed solution, stirring at 120 ℃, clarifying and cooling to room temperature to obtain an inorganic polymer glue solution;
2. pretreatment of the fiber reinforcement:
treating the carbon fiber two-dimensional plain weave fabric reinforcement body for 6 hours at room temperature by using 68wt% concentrated nitric acid to obtain a pretreated fiber reinforcement body;
3. preparation of inorganic polymer slurry:
adding a silicon oxide curing agent accounting for 20wt% of the glue solution into the inorganic polymer glue solution, and performing ball milling and uniform mixing to obtain inorganic polymer slurry;
4. preparing a fiber prepreg:
pouring inorganic polymer slurry into a glue dipping tank, drawing the pretreated fiber reinforcement in the second step at a drawing speed of 2m/min to dip through the glue dipping tank, adjusting the roller-knife distance of a rubber roller to be 0.15mm, drying partial moisture at 80 ℃, and finally cooling a composite PE film or release paper to roll to obtain inorganic polymer prepreg, wherein the prepreg is stored by using an impermeable sealing bag;
wherein the phosphorus source of step one is phosphoric acid; the aluminum source is aluminum hydroxide.
Application example two: the method for preparing the composite material by using the inorganic polymer prepreg is realized by the following steps: the inorganic polymer prepreg is manually cut according to the shape of 40cm multiplied by 2cm, the cut fiber prepreg sheet is shown in figure 5, and after the prepreg is cut and laid, the prepreg sheet is molded and cured through an autoclave, and the curing process comprises the following steps: and under the condition of nitrogen, heating to 500 ℃ at the speed of 0.1 ℃/min, preserving heat for 4h, applying pressure at the temperature of 100 ℃ in the curing process, wherein the pressure is 3MPa to obtain a composite material blank, and cutting and machining the composite material blank to obtain the composite material laminated plate.
The composite laminated plate obtained in the embodiment has the room-temperature tensile strength of 260MPa and the room-temperature bending strength of 300MPa, and the typical microscopic morphology of the composite material is shown in figure 3.
Example three: the difference between the embodiment and the second application embodiment is that an automatic tape laying machine is used for cutting and laying, a special-shaped flat plate with the size of about 10m multiplied by 7m is laid, and the laying temperature is 90 ℃.
The embodiment realizes the automatic layering of the large-size anisotropic ceramic matrix composite prepreg.
Example four: the difference between the embodiment and the application embodiment is that an automatic filament paving machine is used for cutting and paving, the paving temperature is 30 ℃, the filament paving shape is a special-shaped cone with the bottom diameter of 2m and the height of 6m, and autoclave curing is adopted.
The embodiment realizes the automatic laying of the large-size large-curvature ceramic matrix composite prepreg.
Claims (10)
1. The preparation method of the inorganic polymer prepreg is characterized by comprising the following steps:
1. preparing inorganic polymer glue solution:
according to the molar ratio of phosphorus to aluminum being 1-8: 1 adding a phosphorus source and an aluminum source into a solvent, uniformly mixing to obtain a mixed solution, then adding a modifier accounting for 0.02-2 wt% of the mixed solution, continuously stirring at 50-150 ℃, and cooling to obtain an inorganic polymer glue solution;
2. pretreatment of the fiber reinforcement:
pretreating the fiber reinforcement to obtain a pretreated fiber reinforcement;
3. preparation of inorganic polymer slurry:
adding a curing agent accounting for 15-50% of the mass of the glue solution into the inorganic polymer glue solution, and performing ball milling and uniform mixing to obtain inorganic polymer slurry;
4. preparing a fiber prepreg:
pouring inorganic polymer slurry into a dipping tank, drawing the pretreated fiber reinforcement to dip through the dipping tank, and drying and cooling to obtain an inorganic polymer prepreg;
wherein the phosphorus source in the step one is phosphoric acid or phosphorus pentoxide, and the aluminum source is aluminum hydroxide, aluminum nitrate, aluminum chloride or metal alkoxide of aluminum; the modifier is one or more of zinc oxide, magnesium oxide, chromium oxide, boron oxide, calcium oxide, chromium hydroxide, calcium hydroxide and magnesium hydroxide; the curing agent is one or a mixture of more of molybdenum disilicide, hafnium disilicide, silicon oxide, aluminum oxide, silicon nitride, aluminum nitride, boron nitride, silicon carbide, hafnium carbide and tantalum carbide.
2. The method according to claim 1, wherein the solvent in the step one is one or more of methanol, ethanol, propanol and deionized water.
3. The method for preparing the inorganic polymer prepreg according to claim 1, wherein in the first step, the curing agent is a mixture of alumina and silicon oxide in a mass ratio of 3.
4. The method according to claim 1, wherein the fiber reinforcement in the second step is a two-dimensional fabric or fiber mat of carbon fibers, quartz fibers, glass fibers, alumina fibers, silicon nitride fibers, boron nitride fibers, mullite fibers, boron fibers, or organic resin fibers.
5. The method of producing an inorganic polymer prepreg according to claim 1, wherein the pretreatment in the second step is a heat treatment, an anodic oxidation treatment, an acid-base etching treatment, or a surface treatment agent impregnation treatment.
6. The method of claim 5, wherein the heat treatment is performed at a temperature of 300 ℃ to 1500 ℃ in an oxygen, nitrogen, or argon atmosphere.
7. The method for preparing the composite material by using the inorganic polymer prepreg is characterized by comprising the following steps:
and laying the inorganic polymer prepreg, heating, pressurizing, molding and curing to obtain the inorganic polymer composite material.
8. The method for preparing a composite material using an inorganic polymer prepreg according to claim 7, wherein the inorganic polymer prepreg is cut and laid by using an automatic tape laying machine or an automatic filament laying machine.
9. The method of claim 7, wherein the curing is performed by autoclave, vacuum bag or compression molding.
10. The method for preparing the composite material by using the inorganic polymer prepreg according to claim 7, wherein the curing process comprises raising the temperature to 300-500 ℃ at a rate of 0.1-5 ℃/min and keeping the temperature for 2-48 h, and a pressure of 0.05-5 MPa is applied in the curing process.
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CN108892522A (en) * | 2018-07-13 | 2018-11-27 | 中国航发北京航空材料研究院 | The preparation method of oxide fibre enhancing oxide porous ceramic based composites |
CN110282993A (en) * | 2019-08-06 | 2019-09-27 | 山东道普安制动材料有限公司 | A kind of preparation method of the ceramic matric composite of the phase containing interface |
CN112500180A (en) * | 2020-12-13 | 2021-03-16 | 中国航空制造技术研究院 | Nitride fiber reinforced ceramic-based wave-transparent composite material and precision forming method thereof |
CN112851384A (en) * | 2021-01-29 | 2021-05-28 | 中南大学 | Preparation method of low-temperature sintered ceramic matrix composite based on silicon carbide fiber reinforcement |
CN112851385A (en) * | 2021-01-29 | 2021-05-28 | 中国人民解放军国防科技大学 | Continuous alumina fiber reinforced ceramic matrix composite with adjustable dielectric property and preparation method thereof |
CN113800837A (en) * | 2021-09-30 | 2021-12-17 | 湖南工业大学 | Continuous carbon fiber reinforced phosphate group geopolymer composite material and preparation method thereof |
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