## 3 Test Results and Analysis
### DSC Analysis  
Through the testing and analysis of the change rule of the characteristic parameters of the DSC curve before and after exposure to 180 \({}^{\circ}\)C, the thermal stability of the agent can be evaluated [19]. The characteristic parameters of the DSC curve include the initial reaction temperature, the peak temperature of the reaction, the heat of the reaction, and the change rate of the reaction heat. The calculation formula for the reaction heat change rate is shown in equation (1):  
\[\Delta Q/Q_{60^{\circ}\mathrm{C},\mathrm{A}h}=|(Q_{60^{\circ}\mathrm{C}, \mathrm{A}h}-Q_{180^{\circ}\mathrm{C},\mathrm{x}\mathrm{~{}days}})/Q_{60^{\circ }\mathrm{C},\mathrm{A}h}|\times 100\% \tag{1}\]  
where \(x\) is the number of days of storage at 180 \({}^{\circ}\)C, \(Q_{60^{\circ}\mathrm{C},\mathrm{A}h}\) is the reaction heat of the sample exposed to 60 \({}^{\circ}\)C for 4 h, and \(Q_{180^{\circ}\mathrm{C},\mathrm{x}\mathrm{~{}days}}\) is the reaction heat of the sample exposed at 180 \({}^{\circ}\)C for \(x\) days. Figures 7-9 are the DSC curves of the ignition composition of Mg/TeO\({}_{2}\) before and after exposure to 180 \({}^{\circ}\)C.  
Figure 6: XRD pattern of sample A after storage at 60 \({}^{\circ}\)C for 4 h and 180 \({}^{\circ}\)C for 10 days.  
than the working environment temperature of the agent. Therefore, it can be judged that the ignition composition of Mg/TeO\({}_{2}\) had good thermal stability after being exposed to 180 \({}^{\circ}\)C.  
It can be seen from Figure 10a that the pre-reaction peak temperature change of sample A was 36.4 \({}^{\circ}\)C, the peak temperature change within 2 days was relatively large, and the change within 2-10 days was significantly reduced (\(\leq\)2 \({}^{\circ}\)C). The pre-reaction peak temperature change of sample B and sample C were 14.3 \({}^{\circ}\)C and 7.9 \({}^{\circ}\)C, respectively.  
It is indicated from Figure 10b that the reaction heat curves of three kinds of Mg/TeO\({}_{2}\) ignition compositions were almost parallel, and there were inflection points around 2 days, the reaction mechanism was different before and after 2 days. The pre-reaction heat of sample B and sample C was more than one time higher than that of sample A; the higher reaction heat of sample B and sample C was related to the thermal decomposition reaction of fluororubber start from 412 \({}^{\circ}\)C to 438 \({}^{\circ}\)C [20].  
In Figure 10c, the pre-reaction heat change rate of the ignition composition of Mg/TeO\({}_{2}\) changed significantly with the increase of the exposure time at 180 \({}^{\circ}\)C. The pre-reaction heat change rate of sample A first increased and then decreased, and the pre-reaction heat change rate (fitting value) after exposure at 180 \({}^{\circ}\)C for 2 to 5 days reached 80 to 122%. The pre-reaction heat change rates of sample B and sample C both increased with the increase of exposure time at 180 \({}^{\circ}\)C, and the pre-reaction heat change rates after exposure for 10 days were 17.19 and 13.88%, respectively.  
The fluororubber adhesive itself is a high temperature resistant material, and its thermal decomposition starts from 412 \({}^{\circ}\)C to 438 \({}^{\circ}\)C. It can be seen from Figure 10b that the thermal decomposition of fluororubber adhesive increased the pre-reaction heat of the composition, but the temperature at this time was much higher than the working temperature of the composition. It can be seen from Figures 10a and 10c that the characteristic temperature change and the change rate of pre-reaction heat of sample B and sample C were smaller, and the use of fluororubber adhesive increasesd the thermal stability of the composition. Since the peak temperature of the main reaction of  
Figure 10: Characteristic parameters of the DSC curve of the pre-reaction.  
the three Mg/TeO\({}_{2}\) ignition compositions was greater than 500 \({}^{\circ}\)C, the occurrence and variation of the pre-reaction were not expected to have a significant impact on functionality.