| the silicone resin quartz fiber composite insulation layer has good temperature resistance and insulation performance. However, under long-term high-temperature conditions, sintering embrittlement occurs and it is easy to fall off to ensure the insulation performance. In this paper, the mechanism of high-temperature damage and mechanical property degradation of silicone resin quartz fiber filament was studied in detail. The changes in the morphology of the silicone resin quartz fiber composite insulation layer before and after sintering were characterized by SEM, and the structural changes of the composite insulation layer before and after sintering were tested by XRD and FTIR. The crystallization process of the quartz fiber was analyzed by TG-DSC. The test results show that the silicone resin can promote the sintering of the quartz fiber at high temperatures, and the internal stress transfer caused by the silicone resin can cause a large number of surface cracks and defects on the quartz fiber. The amorphous network of quartz fiber filament is destroyed, rearranged, and precipitated γ-Al2O3 crystal. The thermal damage of quartz fiber filaments are aggravated by the combined action of the two. |
