Aluminum-lithium alloy powder for synergistically improving stability and interface adhesion, preparation method and application of aluminum-lithium alloy powder
By forming a double-layer coating of fluorosilanes and aminophenols on the surface of aluminum-lithium alloy powder, the stability and interface compatibility issues of aluminum-lithium alloy fuel were solved, and the combustion efficiency and mechanical properties of the propellant were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BEIJING INST OF TECH
- Filing Date
- 2025-12-31
- Publication Date
- 2026-04-21
AI Technical Summary
Aluminum-lithium alloy fuels are prone to oxidation during storage and are incompatible with propellant components, resulting in insufficient stability and interfacial adhesion, which affects the mechanical integrity and combustion performance of the propellant.
After forming a fluorosilane coating layer on the surface of aluminum-lithium alloy powder, a polymer network is formed through the oxidative self-polymerization of aminophenolic substances, which enhances stability and interfacial adhesion.
It significantly improves the storage stability and interfacial adhesion of aluminum-lithium alloy powder, enhances the combustion efficiency and mechanical properties of the propellant, and avoids the decline in mechanical properties caused by interfacial debonding.
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Figure CN121895100A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to an aluminum-lithium alloy powder that synergistically enhances stability and interfacial adhesion, its preparation method, and its application, belonging to the field of energetic materials technology. Background Technology
[0002] Aluminum (Al), as a metallic fuel, is a key component of composite solid propellants. Due to its high energy density, low cost, and easy availability, it is widely used in civil aerospace propulsion systems (such as launch vehicles and satellite attitude control). Aluminum powder releases a large amount of heat during combustion, significantly increasing the specific impulse and energy density of the propellant, thereby enhancing the payload capacity and operational efficiency of the spacecraft. However, aluminum particles tend to form large agglomerates during combustion, especially when the content exceeds 20%, leading to decreased combustion efficiency and exacerbating two-phase flow losses, limiting the application of high-aluminum content propellants. To overcome the inherent defects of pure aluminum powder, research has shifted to aluminum-based alloy fuels, particularly aluminum-lithium (Al-Li) alloy fuels. The introduction of lithium (Li) can effectively lower the ignition temperature of the alloy while increasing the total heat release and combustion efficiency. The high calorific value (45.8 kJ / g) and low melting point (460 K) of lithium induce a "micro-explosion effect" in Al-Li alloy powder during combustion, significantly suppressing the agglomeration tendency of pure aluminum powder. In addition, Al-Li alloys emit less hydrogen chloride (HCl) gas during combustion, making them more suitable for propulsion systems with high environmental protection requirements.
[0003] While aluminum-lithium alloy fuels offer significant advantages in energy density and combustion efficiency, their practical application still faces several key challenges. The primary issue lies in the high chemical reactivity of lithium, which makes the alloy susceptible to unintended oxidation by atmospheric oxygen and moisture during storage, severely impacting its long-term stability. Simultaneously, Al-Li alloys exhibit poor compatibility with other propellant components, and interfacial incompatibility can impair the mechanical integrity and combustion performance of the propellant. These defects collectively restrict the widespread application of Al-Li alloys in advanced propellants. Current research focuses heavily on surface modification techniques to improve the stability and compatibility of Al-Li alloys. However, improvements in storage stability often come at the cost of reduced energy output or weakened interfacial bonding. Existing methods using fluorosilanes and catechol for synergistic coating of Al-Li alloys still suffer from poor interfacial compatibility and weak chemical bonding between the coating and binder when applied to propellants, resulting in limited improvements in propellant mechanical properties and failing to meet high reliability requirements. In propellant science, developing a multifunctional coating that simultaneously ensures mechanical compatibility, improves storage stability, and maintains high energy characteristics remains a core challenge. Summary of the Invention
[0004] In view of this, the purpose of this invention is to provide an aluminum-lithium alloy powder that synergistically improves stability and interfacial adhesion, its preparation method, and its application. Aminophenolic substances rich in reactive amino and catechol groups are introduced into a fluorosilane molecular layer, forming an oxidized polymer matrix through the covalent self-assembly of the aminophenolic substances. By applying this aminophenol-modified coating to the surface of Al-Li alloys, the aim is to simultaneously improve their stability and interfacial adhesion, thereby solving the key problem of poor interfacial mechanical properties in Al-Li alloy-based propellants.
[0005] To achieve the above objectives, the technical solution of the present invention is as follows.
[0006] An aluminum-lithium alloy powder that synergistically improves stability and interfacial adhesion is first processed to distribute free hydroxyl groups on the surface of the aluminum-lithium alloy powder. Then, the hydroxyl groups formed by the hydrolysis of fluorosilane and the free hydroxyl groups on the surface of the alloy powder undergo dehydration condensation to form Al-O-Si bonds, forming a fluorosilane coating layer on the surface of the aluminum-lithium alloy powder. Then, aminophenolic substances are oxidized to form a polymeric prepolymer, which is deposited on the surface of the fluorosilane coating layer through self-polymerization to form a polymer coating layer, thus obtaining an aluminum-lithium alloy powder that synergistically improves stability and interfacial adhesion. The fluorosilane is a mixture of three fluorosilanes: the first fluorosilane is one or more of fluorosilanes with 6 or fewer fluorine atoms; the second fluorosilane is one or more of fluorosilanes with 9 to 13 fluorine atoms; and the third fluorosilane is one or more of fluorosilanes with 15 or more fluorine atoms.
[0007] Preferably, the amount of fluorosilane added is 10% to 50% of the mass of the aluminum-lithium alloy powder, and the amount of aminophenolic substances added is 2% to 20% of the mass of the aluminum-lithium alloy powder.
[0008] Preferably, the first fluorosilane is 3,3,3-trifluoropropyltrimethoxysilane and / or hexafluorobutyltriethoxysilane, the second fluorosilane is nonafluorohexyltriethoxysilane and / or trimethoxy-1H,1H,2H,2H-tridecylfluorooctylsilane, and the third fluorosilane is perfluorodecyltriethoxysilane and / or perfluorodecyltrimethoxysilane.
[0009] Preferably, based on the total mass of the fluorosilanes as 100%, the mass fraction of the first fluorosilane is 10% to 40%, the mass fraction of the second fluorosilane is 20% to 50%, and the mass fraction of the third fluorosilane is 10% to 40%.
[0010] Preferably, the aminophenolic substance is p-aminophenol or dopamine.
[0011] Preferably, the aluminum-lithium alloy powder has a particle size of 10-50 μm and a lithium mass fraction of 2%-5%.
[0012] A method for preparing aluminum-lithium alloy powder that synergistically improves stability and interfacial adhesion, as described in this invention, includes the following steps: (1) Add aluminum-lithium alloy powder to a mixed solvent of anhydrous ethanol and n-hexane, and disperse it evenly by ultrasonication to obtain an alloy powder dispersion. (2) Dissolve deionized water, silane additive and fluorosilane in an organic solvent to obtain a fluorosilane mixed solution; the ratio of deionized water to fluorosilane is 50 μL: 1~6 g; (3) Under continuous stirring, the fluorosilane mixed solution was added to the alloy powder dispersion and stirred for more than 2 hours. After stirring, the mixture was filtered, washed and dried to obtain the fluorosilane-coated alloy powder. (4) Prepare a Tris-ethanol buffer solution with a pH of 8-10; add the aminophenolic substance to the buffer solution to obtain an aminophenolic substance solution; (5) Add the fluorosilane-coated alloy powder to the aminophenol solution and stir to disperse it evenly. First, expose it to air for 10-20 minutes, then seal and stir for 6-18 hours. After stirring, filter, wash and dry to obtain aluminum-lithium alloy powder that synergistically improves stability and interfacial adhesion.
[0013] Preferably, in step (1), the ratio of aluminum-lithium alloy powder to organic solvent is 1g:10~50mL, and the mass of anhydrous ethanol is 5%~20% of the mass of n-hexane.
[0014] Preferably, in step (2), the organic solvent is ethyl acetate or n-hexane.
[0015] Preferably, in step (2), the silane auxiliary is one or more of isopropanol, anhydrous ethanol and anhydrous methanol, and the ratio of the silane auxiliary to fluorosilane is 1 mL: 1~6 g.
[0016] Preferably, in step (3), the mass of the fluorosilane is 10% to 50% of the mass of the aluminum-lithium alloy powder.
[0017] Preferably, in step (4), the concentration of the aminophenolic substance solution is 1~5 g / L.
[0018] Preferably, in step (5), the mass of the aminophenolic substance is 2% to 20% of the mass of the aluminum-lithium alloy powder.
[0019] Preferably, in step (5), the product is dried by blowing air at 70~100℃ for 8h~10h.
[0020] An application of the aluminum-lithium alloy powder described in this invention to synergistically enhance stability and interfacial adhesion, wherein the alloy powder is used as a high-energy additive for solid propellants.
[0021] Beneficial effects (1) This invention provides an aluminum-lithium alloy powder that synergistically improves stability and interfacial adhesion, and its preparation method. Fluorosilane and aminophenolic substances, which are interfacial modifiers, are introduced into the aluminum-lithium alloy powder system. A dense coating film is first formed on the surface of the alloy powder, which improves the storage stability of the alloy powder. Then, the aminophenolic substances undergo oxidative self-polymerization under mild conditions, resulting in intermolecular covalent polymerization and forming a cross-linked polymer network. The double coating layer is a molecular-level ultrathin structure. Thermogravimetric analysis shows that its decomposition mass loss is minimal, and its effect on the intrinsic energy density of the alloy is negligible.
[0022] (2) This invention provides an application of aluminum-lithium alloy powder that synergistically enhances stability and interfacial adhesion. The fluorosilane layer promotes the exfoliation of surface oxides and the formation of aluminum fluoride during combustion, and, in conjunction with the protective effect of polyaminophenols on lithium, can significantly enhance combustion intensity, effectively inhibit particle agglomeration, and improve combustion efficiency. This allows the modified alloy to possess both high energy output and excellent stability and interfacial mechanical properties in propellants. The introduction of aminophenols also endows it with certain modifiability. Since aminophenols have abundant amino and catechol groups, firstly, the amino groups in the aminophenol polymer can chemically react with the isocyanate curing agent in solid propellants (such as HTPB propellants) to form covalent bonds, which greatly enhances the interfacial chemical bonding force. Through its unique ortho-bisphenol hydroxyl structure, it forms strong coordination bonds with metal surfaces and can generate multiple hydrogen bonds, thereby achieving efficient and universal adhesion to various material surfaces. This significantly enhances interfacial adhesion, resulting in a substantial improvement in the fracture stress of the aluminum-lithium-based butyl hydroxyl propellant, which exceeds that of pure aluminum-based butyl hydroxyl propellant. This avoids the decline in mechanical properties caused by interfacial debonding. Attached Figure Description
[0023] Figure 1 The results show the water contact angles of the Al, Al-4.7Li@F, and Al-4.7Li@FA alloy powders in the examples.
[0024] Figure 2 The tensile fracture strength results are shown for the HTPB composite propellants prepared from Al, Al-4.7Li@F, and Al-4.7Li@FA alloy powders in the examples.
[0025] Figure 3 Scanning electron microscope (SEM) images of the fracture surfaces of HTPB composite propellants prepared from Al-4.7Li@F (a) and Al-4.7Li@FA (b) alloy powders after tensile fracture, as shown in the examples. Detailed Implementation
[0026] The present invention will be further described in detail below with reference to specific embodiments.
[0027] Example 1 1 g each of 3,3,3-trifluoropropyltrimethoxysilane, trimethoxy-1H,1H,2H,2H-tridecylfluorooctylsilane, and perfluorodecyltrimethoxysilane were mixed in a test tube, and 100 μL of water, 2 mL of isopropanol, and 10 mL of n-hexane were added. The mixture was stirred for 5 min to disperse the fluorosilanes evenly, resulting in a fluorosilane mixed solution. 10 g of aluminum-lithium alloy powder (lithium content 5%) was added to 200 mL of n-hexane-anhydrous ethanol solution (anhydrous ethanol content 10% of the volume of n-hexane) to prepare an alloy powder suspension. The suspension was placed in an ultrasonic machine, and the ultrasonication was turned on while stirring. After stirring for 30 min, the fluorosilane mixed solution was added to the resulting suspension in portions, and stirring was continued for 2 h to obtain the first layer of coated product. After the reaction was completed, the solid and liquid were separated, and the solid was dried under vacuum at 60 °C for 6 h to obtain Al-4.7Li@F alloy powder, which was stored under vacuum for later use. Tris was dissolved in 200 mL of anhydrous ethanol, and the pH was adjusted to 9 to obtain the buffer solution required for the reaction. 0.6 g of dopamine hydrochloride and 10 g of the alloy powder coated in the previous step were added. After stirring and mixing thoroughly, the mixture was placed in air for 10 min; stirring was continued for 10 h. After the mixture was finished, it was centrifuged, washed, and vacuum dried to obtain the final product, Al-4.7Li@FA alloy powder.
[0028] Water contact angle tests were performed on the obtained Al-4.7Li@FA powder. The results showed that its contact angle was significantly lower than that of Al-4.7Li@F, indicating a marked improvement in hydrophobicity. The contact angle was closer to that of pure aluminum powder, which is beneficial for improving its interfacial compatibility in propellants. Thermogravimetric analysis showed that the maximum mass loss of this powder in a nitrogen atmosphere was minimal, indicating that the mass proportion of the double-layer coating was very low and its impact on the intrinsic energy density of the alloy was negligible. Tensile tests on HTPB propellant samples prepared using this powder showed a significantly higher fracture stress than the single fluorosilane-coated sample, indicating that the process conditions effectively enhanced interfacial adhesion.
[0029] Example 2 0.8 g of 3,3,3-trifluoropropyltrimethoxysilane, 1.4 g of trimethoxy-1H,1H,2H,2H-tridecylfluorooctylsilane, and 0.8 g of perfluorodecyltrimethoxysilane were mixed in a test tube, and 100 μL of water, 1 mL of isopropanol, and 10 mL of n-hexane were added. The mixture was stirred for 5 min to ensure uniform dispersion. 10 g of aluminum-lithium alloy powder (lithium content 5%) was added to 200 mL of n-hexane-anhydrous ethanol solution (anhydrous ethanol content 10% of the volume of n-hexane) to prepare an alloy powder suspension. The suspension was placed in an ultrasonic machine, and the ultrasonication was turned on while stirring. After stirring for 30 min, a fluorosilane mixture was added to the resulting suspension, and stirring was continued. After 30 min, the ultrasonication was turned off. After stirring for another 1.5 h, the first layer of coated product was obtained. After the reaction was completed, the solid and liquid were separated, and the solid was dried under vacuum at 60 °C for 6 h to obtain Al-4.7Li@F alloy powder, which was stored under vacuum for later use. Tris was dissolved in 200 mL of anhydrous ethanol, and the pH was adjusted to 9 to obtain the buffer solution required for the reaction. 2 g of dopamine hydrochloride and 10 g of the alloy powder coated in the previous step were added separately. After stirring and mixing thoroughly, the mixture was placed in air for 10 min. After stirring, the mixture was centrifuged, washed, and vacuum dried to obtain the final product, Al-4.7Li@FA alloy powder.
[0030] Water contact angle testing showed that the contact angle of this powder was significantly lower than that of a single fluorosilane coating, indicating that hydrophobicity was still improved. Scanning electron microscopy revealed an increased surface roughness and locally visible dopamine aggregates, suggesting that excessively high dopamine concentrations may lead to decreased coating uniformity. When used in the preparation of HTPB propellant, tensile testing showed an increased fracture stress compared to the unmodified fluorosilane-coated sample, indicating that while excessively high aminophenol concentrations can improve interfacial bonding, they may limit further improvement in mechanical properties due to coating uniformity.
[0031] Example 3 0.8 g of 3,3,3-trifluoropropyltrimethoxysilane, 1.4 g of trimethoxy-1H,1H,2H,2H-tridecylfluorooctylsilane, and 0.8 g of perfluorodecyltrimethoxysilane were mixed in a test tube, and 100 μL of water, 1 mL of isopropanol, and 10 mL of n-hexane were added. The mixture was stirred for 5 min to ensure uniform dispersion. 10 g of aluminum-lithium alloy powder (lithium content 5%) was added to 200 mL of n-hexane-anhydrous ethanol solution (anhydrous ethanol content 10% of the volume of n-hexane) to prepare an alloy powder suspension. The suspension was placed in an ultrasonic machine, and the ultrasonication was turned on while stirring. After stirring for 30 min, a fluorosilane mixture was added to the resulting suspension, and stirring was continued. After 30 min, the ultrasonication was turned off. After stirring for another 1.5 h, the first layer of coated product was obtained. After the reaction was completed, the solid and liquid were separated, and the solid was dried under vacuum at 60 °C for 6 h to obtain Al-4.7Li@F alloy powder, which was stored under vacuum for later use. Tris was dissolved in 600 mL of anhydrous ethanol, and the pH was adjusted to 9 to obtain the buffer solution required for the reaction. The 600 mL buffer solution was divided into three groups of 200 mL each. 1 g of dopamine and 10 g of the alloy powder coated in the previous step were added to each group. After stirring and mixing thoroughly, the mixture was placed in air for 20 min; stirring was repeated for 8 h, 16 h, and 24 h, respectively. After these steps, the mixture was centrifuged, washed, and vacuum dried to obtain the final alloy powder product.
[0032] Contact angle tests were performed on the product obtained in the example and Al powder (Al powder was used as a control group), and the results are as follows: Figure 1 As shown, the contact angle is 115.2°, and the good hydrophobicity can effectively protect the reactive lithium. However, in the propellant, the solid-liquid interface bonding is hindered by excessive hydrophobicity. By adding a PDA layer, the strong hydrophobicity caused by the fluorosilane coating layer can be effectively improved. The contact angle of the double-coated alloy powder can be reduced to about 67°, which is close to the 71.6° of Al powder.
[0033] The thermal stability of the coating was quantified by TG testing of the products obtained in the examples and the Al-4.7Li raw powder under an inert nitrogen atmosphere. The results showed that the Al-4.7Li and Al-4.7Li@F alloy powders exhibited the highest thermal stability. The mass loss of the alloy powder after double-layer coating was significantly reduced, indicating that the mass of the FA coating in the alloy powder is negligible. This negligible mass fraction preserves the inherent energy characteristics, which is attributed to the ultrathin molecular-scale structure of the biomimetic coating, maximizing oxidation resistance while maintaining fuel energy density.
[0034] To verify the good interfacial adhesion of the aluminum-lithium alloy powder prepared in this example, HTPB composite propellant was prepared using the alloy powder. After curing, stress-strain tests were performed on the propellant specimens using an electronic universal tensile testing machine. The propellant specimens were dumbbell-shaped (Type 3, total length 50 mm, conforming to GB / T 528-2009 standard). The test results are as follows. Figure 2 As shown, the Al-4.7Li@F propellant exhibits a fracture stress of only 0.269 MPa due to interfacial incompatibility. However, the propellant fracture stress of the dopamine-modified alloy powder significantly increases to 1.628 MPa, representing a 26.989% improvement compared to the 1.282 MPa of the pure aluminum-based propellant. Furthermore, SEM microstructure analysis of the propellant cross-section yielded the following results: Figure 3 As shown. First, from Figure 3 The results show that the propellant cross-section of Al-4.7Li@F alloy powder exhibits a large number of micron-sized particles tightly adhering to the surface of AP particles. Based on their size, these particles are composed of Al-4.7Li@F alloy powder and silica. Due to the strong hydrophobicity of the Al-4.7Li@F alloy powder surface and the weak interfacial bonding force with the propellant binder, cracks preferentially initiate and rapidly propagate at the alloy powder / binder interface, ultimately leading to a significant reduction in the overall propellant fracture energy and a lower fracture force. However, in contrast, the propellant cross-section of dopamine-modified alloy powder... Figure 3 As shown in b, the cross-section of the propellant in Al-4.7Li@FA alloy powder mainly consists of intermittent pits and blocky solids, such as... Figure 3 b. Based on the dimensions, the irregular blocky solids in the cross-section are AP particles, indicating that stress concentration first occurs on the surface of the AP particles due to the anti-wetting effect, and cracks propagate along the weak interface between the AP and the binder, leading to fracture. The surface polydopamine coating can effectively increase the interfacial bonding force between the alloy powder and the binder, effectively suppressing fracture caused by the initial anti-wetting of the alloy powder surface, thus preventing poor mechanical properties of the propellant.
[0035] In summary, the invention includes, but is not limited to, the above embodiments. Any equivalent substitutions or partial improvements made under the spirit and principles of this invention shall be considered to be within the protection scope of this invention.
Claims
1. An aluminum-lithium alloy powder that synergistically improves stability and interfacial adhesion, characterized in that: First, the aluminum-lithium alloy powder is treated to distribute free hydroxyl groups on its surface. Then, the hydroxyl groups formed by the hydrolysis of fluorosilane are dehydrated and condensed with the free hydroxyl groups on the surface of the alloy powder to form Al-O-Si bonds, forming a fluorosilane coating layer on the surface of the aluminum-lithium alloy powder. Then, the aminophenolic substances are oxidized to form a polymeric prepolymer, which is deposited on the surface of the fluorosilane coating layer through self-polymerization to form a polymer coating layer, thus obtaining aluminum-lithium alloy powder with synergistically improved stability and interfacial adhesion. The fluorosilane is a mixture of three fluorosilanes: the first fluorosilane is one or more of fluorosilanes with 6 or fewer fluorine atoms; the second fluorosilane is one or more of fluorosilanes with 9 to 13 fluorine atoms; and the third fluorosilane is one or more of fluorosilanes with 15 or more fluorine atoms.
2. The aluminum-lithium alloy powder as described in claim 1, characterized in that: The amount of fluorosilane added is 10% to 50% of the mass of the aluminum-lithium alloy powder, and the amount of aminophenolic substances added is 2% to 20% of the mass of the aluminum-lithium alloy powder.
3. The aluminum-lithium alloy powder as described in claim 1, characterized in that: The first type of fluorosilane is 3,3,3-trifluoropropyltrimethoxysilane and / or hexafluorobutyltriethoxysilane, the second type of fluorosilane is nonafluorohexyltriethoxysilane and / or trimethoxy-1H,1H,2H,2H-tridecylfluorooctylsilane, and the third type of fluorosilane is perfluorodecyltriethoxysilane and / or perfluorodecyltrimethoxysilane. And / or, the aminophenolic substance is p-aminophenol or dopamine; And / or, the aluminum-lithium alloy powder has a particle size of 10~50μm and a lithium mass fraction of 2%~5%; Preferably, based on the total mass of the fluorosilanes as 100%, the mass fraction of the first fluorosilane is 10% to 40%, the mass fraction of the second fluorosilane is 20% to 50%, and the mass fraction of the third fluorosilane is 10% to 40%.
4. A method for preparing aluminum-lithium alloy powder with synergistic improvement in stability and interfacial adhesion as described in any one of claims 1 to 3, characterized in that: The method steps include: (1) Add aluminum-lithium alloy powder to a mixed solvent of anhydrous ethanol and n-hexane, and disperse it evenly by ultrasonication to obtain an alloy powder dispersion. (2) Dissolve deionized water, silane additive and fluorosilane in an organic solvent to obtain a fluorosilane mixed solution; the ratio of deionized water to fluorosilane is 50 μL: 1~6 g; (3) Under continuous stirring, the fluorosilane mixed solution was added to the alloy powder dispersion and stirred for more than 2 hours. After stirring, the mixture was filtered, washed and dried to obtain the fluorosilane-coated alloy powder. (4) Prepare a Tris-ethanol buffer solution with a pH of 8-10; add the aminophenolic substance to the buffer solution to obtain an aminophenolic substance solution; (5) Add the fluorosilane-coated alloy powder to the aminophenol solution and stir to disperse it evenly. First, expose it to air for 10-20 minutes, then seal and stir for 6-18 hours. After stirring, filter, wash and dry to obtain aluminum-lithium alloy powder that synergistically improves stability and interfacial adhesion.
5. The method for preparing aluminum-lithium alloy powder with synergistically improved stability and interfacial adhesion as described in claim 4, characterized in that: In step (1), the ratio of aluminum-lithium alloy powder to organic solvent is 1g:10~50mL, and the mass of anhydrous ethanol is 5%~20% of the mass of n-hexane.
6. The method for preparing aluminum-lithium alloy powder with synergistically improved stability and interfacial adhesion as described in claim 4, characterized in that: In step (2), the organic solvent is ethyl acetate or n-hexane; And / or, the silane auxiliary is one or more of isopropanol, anhydrous ethanol and anhydrous methanol, and the ratio of silane auxiliary to fluorosilane is 1 mL: 1~6 g.
7. The method for preparing aluminum-lithium alloy powder with synergistically improved stability and interfacial adhesion as described in claim 4, characterized in that: In step (3), the mass of the fluorosilane is 10% to 50% of the mass of the aluminum-lithium alloy powder.
8. The method for preparing aluminum-lithium alloy powder with synergistic improvement in stability and interfacial adhesion as described in claim 4, characterized in that: In step (4), the concentration of the aminophenolic substance solution is 1~5 g / L.
9. The method for preparing aluminum-lithium alloy powder with synergistically improved stability and interfacial adhesion as described in claim 4, characterized in that: In step (5), the mass of the aminophenolic substance is 2% to 20% of the mass of the aluminum-lithium alloy powder; And / or, dry by blowing air at 70~100℃ for 8h~10h.
10. The application of an aluminum-lithium alloy powder as described in any one of claims 1 to 3, which synergistically enhances stability and interfacial adhesion, characterized in that: The alloy powder is used as a high-energy additive for solid propellants.