Combustion Behavior Characterization

The combustion behaviors of the samples were characterized by a self-developed instrument with the schematic diagram shown in Figure 2; it was composed of a solid CO₂ laser (SLC110, 10.6 μm), a photo detector, a high-speed camera, and a digital oscilloscope (TEK DPO4034). The ignition delay time was calculated by the difference between the moment the laser emitted and the moment that the light of the igniting sample reached the photo detector. Simultaneously, the combustion processes were recorded by the high-speed camera with 2000 fps. The sample with the dimensions of roughly 5 mm × 5 mm was pasted on the combustion cell, and each sample was tested three times with the average as the ignition delay time.