Wenke Zhang,Jianzhong Liu,Huanhuan Gao,Haitian Gong
To investigate the detailed combustion processes of solid propellant components near the burning surface, this study develops a microscopic ignition and combustion experimental method and establishes a corresponding test system. A high-power microscope and image sensor are employed to continuously record the ignition and combustion of thin-film solid propellants (TFSP, AP/HTPB/Al). By integrating existing theories with image processing techniques, the combustion behavior of AP, Al, and the TFSP as a whole is analyzed in detail. A refined combustion surface model is constructed based on decomposition results, offering theoretical support for ignition combustion modeling and its integration with agglomeration models. Quantitative analysis reveals that reducing AP particle size in TFSP significantly enhances burning rate and combustion surface irregularity. This approach enables the observation of finer combustion behaviors and provides a novel perspective for solid propellant ignition and combustion research.
Erhai An,Yingxin Tan,Cunjuan Yu,Ying Zhang,Haihong Liu,Xiong Cao,Peng Deng,Xiaoxia Li
Nano Silicon (Si) powder has become a new type of solid fuel in recent years because of its high energy density , large gas production, and low agglomeration behavior. Optimizing and improving its energy release performance is an important challenge. In this paper, DAP-4, an energetic molecular perovskite material with high energy and strong oxidation , was introduced as the oxidant to prepare DAP-4/Si composites, and its combustion properties were studied. The thermal decomposition , combustion performance, as well as their combustion product properties, were studied. The results showed the thermal decomposition properties of DAP-4/Si composites still keep stable (>370 °C), and the combustion properties of DAP-4/Si composites first increase with Si content and then reduced. It was confirmed that DAP-4/Si with the ratio of 6.5:3.5–6:4 had a better burning intensity than the other ratios. The combustion mechanism of DAP-4/Si composites was proposed based on the ignition and combustion characteristics of DAP-4/Si composites. This work may provide a further reference for the application of DAP-4 into solid propellant formulation.
In this paper, a new flame retardant synergist PSil-CS was successfully synthesized, which was combined with flame retardant ammonium polyphosphate (APP) to flame retardant Unsaturated polyester resin (UPR) composites. When the weight ratio of APP: PSil-CS is 30:1 and 15:1, the UL 94 V-0 level can be achieved. When the weight ratio of APP: PSil-CS is 15:1, the UPR showed a good flame retardant promotion effect, the LOI value was up to 35.1 %, the peak heat release rate (pk-HRR) was 70.45 % lower than that of pure UPR sample, and 30.4 % lower than that of UPR/APP-16 % sample. Under the premise that the total amount of flame retardants is unchanged, although the total amount of phosphorus is reduced by replacing APP with PSil-CS, it is found in TGIR test that the addition of PSil-CS can promote the flame retarding effect of phosphorus by generating more PO· and PO2· free radicals. These free radicals can capture the free radicals released by the UPR matrix during the combustion process, thus interrupting the chain reaction of the combustion of UPR composites and reducing the combustion intensity of the composites. Adding PSil-CS can promote the carbonization of the UPR matrix and increase the utilization efficiency of the P element. The silicon element can also form a silicon-containing protective layer on the surface to improve the thermal stability of the surface char layer. At the same time, the addition of phosphosilane-modified PSil-CS can effectively improve the bending strength of the composites.
危险品化学品经营许可证（带存储）