## 4 Conclusions  
In view of the lack of previous studies on the thermal stability of the Mg/TeO\({}_{2}\) ignition composition after exposure to 180 \({}^{\circ}\)C temperatures, this article has conducted a series of tests to comprehensively analyze the physical, chemical, and explosive properties of the Mg/TeO\({}_{2}\) ignition composition after exposure to 180 \({}^{\circ}\)C. The comprehensive evaluation showed that the Mg/TeO\({}_{2}\) ignition composition had good thermal stability at 180 \({}^{\circ}\)C. The main conclusions are as follows:  
1. [leftmargin=*]
2. Apparent morphology: after being exposed to 180 \({}^{\circ}\)C, the overall color of the Mg/TeO\({}_{2}\) ignition composition became darker and showed a little more metallic luster. No breakages, cracks, expansion and looseness, pits, shrinkage, melting, or surplus materials were found by an optical microscope, and no changes of morphology and surface details were found by SEM.
3. XRD: X-ray diffraction patterns showed that the positions of the characteristic diffraction peaks of the main components did not change, and Mg(OH)\({}_{2}\) was formed by the reaction of magnesium with moisture in the air.
4. DSC: before 380 \({}^{\circ}\)C, there was no endothermic/exothermic reaction of the Mg/TeO\({}_{2}\) ignition composition, and there was a pre-reaction exothermic peak between 388 \({}^{\circ}\)C and 470 \({}^{\circ}\)C. The main exothermic peak was greater than 500 \({}^{\circ}\)C, and the initial reaction temperature was more than 200 \({}^{\circ}\)C higher than the working temperature.
5. Weight loss ratio: the weight loss ratio of the Mg/TeO\({}_{2}\) ignition composition and its components after exposure to 180 \({}^{\circ}\)C were within 0.94% and 0.71%, respectively.  
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Type**} & **Storage** & **Number of** & **Average Peak** & **Average Rise** & **Change Rate of Peak** \\  & **Condition** & **Sample** & **Pressure \(\mathbf{p}\)/MPa** & **Time \(\mathbf{t}\)/ms** & **Pressure/\%** \\ \hline \multirow{3}{*}{sample C} & 60 \({}^{\circ}\)C, 4 h & 3 & 1.61 & 0.34 & 0 \\  & 180 \({}^{\circ}\)C, 5 days & 3 & 1.54 & 0.39 & \(-\)4.35 \\  & 180 \({}^{\circ}\)C, 10 days & 3 & 1.48 & 0.38 & \(-\)8.07 \\ \hline \hline \end{tabular}
\end{table}
Table 4: Mean values of characteristic parameters of the _P_-_t_ curve of sample C after the 180 \({}^{\circ}\)C test.  
Figure 13: _P_-t curves of sample C before and after storage at 180 \({}^{\circ}\)C.  
* Content change: the active magnesium content of the three kinds of Mg/TeO\({}_{2}\) ignition compositions varied from 0.49 to 0.90% after being exposed to 180 \({}^{\circ}\)C for 10 days.
* \(P\)-\(t\) test: after being exposed to 180 \({}^{\circ}\)C for 10 days, the peak pressure of simple C only decreased by 8.07% (0.13 Mpa), and the change of the pressure rise time was 0.04 ms.  
Conceptualization, X.H. and N.Y.; methodology, X.H., Z.L., and C.L.; formal analysis, N.Y. and Y.Y.; investigation, Z.L.; resources, J.H., F.D., and Y.Y.; data curation, J.H.; writing--original draft preparation, X.H.; writing--review and editing, X.H.; visualization, X.H. and C.L.; project administration, F.D. and Y.Y. All authors have read and agreed to the published version of the manuscript.  
This research was funded by the Beijing Institute of Spacecraft System Engineering.  
We would like to give thanks for the support from State Key Laboratory of Explosive Science and Technology, the experimental arrangement from the R & D Center, [PERSON]'s guidance in the field of thermal analysis, and the funding and experimental support from the Beijing Institute of Spacecraft System Engineering.  
The authors declare no conflict of interest.