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Core-shell type aluminum-coated perchlorate/catalyst composite microsphere and solid propellant based on microsphere

A technology of solid propellants and composite microspheres, applied in the field of solid propellants and composite solid propellants, can solve problems such as unsatisfactory results, and achieve the effects of avoiding friction, enhancing heat and mass transfer processes, and increasing specific impulse

Inactive Publication Date: 2021-08-27
NORTHWESTERN POLYTECHNICAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Researchers usually use the method of adding a combustion catalyst to adjust the burning rate pressure index of the propellant, but a large number of experimental results show that the existing combustion catalyst will bring different degrees to the energy level, mechanical properties, storage stability and process performance of the propellant. (Isert S, Groven L J, Lucht R P, et al. The effect of encapsulated nanosized catalysts on the combustion of composite solid propellants[J]. Combustion and Flame, 2015, 162(5): 1821-1828.)
Therefore, in order to improve the catalytic efficiency of combustion catalysts and reduce their usage in propellant formulations, researchers have conducted a lot of research on the catalytic combustion mechanism of catalysts, but the results are not ideal

Method used

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  • Core-shell type aluminum-coated perchlorate/catalyst composite microsphere and solid propellant based on microsphere
  • Core-shell type aluminum-coated perchlorate/catalyst composite microsphere and solid propellant based on microsphere
  • Core-shell type aluminum-coated perchlorate/catalyst composite microsphere and solid propellant based on microsphere

Examples

Experimental program
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Effect test

Embodiment 1

[0055] The preparation process can be divided into the following three steps:

[0056] S1: Add 2.5g of AP (ammonium perchlorate) to 15ml of distilled water, then add 2.5g of Al powder, after ultrasonic treatment for 10min, magnetically stir for 2h to obtain the precursor solution;

[0057] S2: Add 0.1 g of polyvinylpyrrolidone (PVP) to the precursor solution to adjust the viscosity of the precursor solution;

[0058] S3: Treat the precursor solution obtained in step S2 with a spray drying device, the inlet air temperature is 150°C, and the injection rate is 9ml min -1 , the fan is 35m 3 min -1 , to collect the resulting complex;

[0059] S4: The composite obtained in step S3 was placed in dichloromethane solvent and stirred for 12 hours, the solid was collected by filtration and freeze-dried for 24 hours to prepare composite microspheres Al@AP.

[0060] The particle size distribution result of embodiment 1 is as shown in table 1, D 50 is 5.09 μm. figure 1 It is the SEM-E...

Embodiment 2

[0065] Others are the same as in Example 1, and 0.28 g of CuO is added to the precursor solution in step S1 to obtain composite microspheres Al@AP / CuO.

[0066] The particle size distribution result of embodiment 2 is as shown in table 1, D 50 is 5.21 μm. Figure 4 It is the SEM-EDS picture of Example 2 and its ideal model. It can be seen that the Al@AP / CuO composite microsphere has a complete structure and a high degree of sphericity ( Figure 4 a and b), CuO is uniformly embedded inside the AP crystal ( Figure 4 c), its ideal model is as Figure 4 as shown in e.

Embodiment 3

[0071] Others are the same as in Example 1, add 0.28g of Fe to the precursor solution in step S1 2 o 3 , to obtain core-shell composite microspheres Al@AP / Fe 2 o 3 . The particle size distribution result of embodiment 3 is as shown in table 1, D 50 is 5.15 μm.

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Abstract

The invention provides a core-shell type aluminum-coated perchlorate / catalyst composite microsphere and a solid propellant based on the microsphere so as to reduce the pressure index of an existing Al-based composite solid propellant and improve the catalytic efficiency of a catalyst. The core-shell type aluminum-coated perchlorate / catalyst composite microsphere is composed of the following components in percentage by mass: 25%-80% of a perchlorate oxidant, 5%-75% of aluminum powder and 0%-20% of a catalyst, wherein the aluminum powder is tightly coated with the perchlorate oxidant to form the core-shell type composite microsphere with the particle size of 1.0-400 microns. When the composite microspheres contain a catalyst, the catalyst is embedded among the perchlorate oxidizing agent crystals, and all the components are in close contact.

Description

technical field [0001] The invention belongs to the technical field of composite solid propellants, in particular to a core-shell aluminum@perchlorate / catalyst composite microsphere and a solid propellant based on the microsphere. Background technique [0002] As the energy and working fluid source of Solid Rocket Motor (SRM), solid propellant is widely used in various launch vehicles and weaponry, and its combustion performance largely determines the performance of SRM. With the exception of solid propellants for variable thrust SRMs, designers generally desire propellants with low burn rate pressure exponents. A high pressure index means that a small pressure disturbance during the SRM working process will cause a large change in the burning rate, resulting in pressure oscillations in the SRM combustion chamber. This not only brings great challenges to the structural design of SRM, but also may cause major safety accidents. [0003] Researchers usually use the method of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C06B33/06C06B45/30C06B21/00C06D5/06
CPCC06B21/0008C06B33/06C06B45/30C06D5/06
Inventor 严启龙吕杰尧孙德民
Owner NORTHWESTERN POLYTECHNICAL UNIV
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