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有机硅-石英纤维丝复合绝缘层烧结损伤机制的研究
  
DOI:
中文关键词:  有机硅  石英纤维丝  烧结  γ-Al2O3  析晶
英文关键词:Organosilicon  Quartz fiber filament  Sinter  γ-Al2O3  Crystallization
基金项目:
作者单位
谢历,瞿晓芬,张兆 上海电缆研究所有限公司特种电缆技术国家重点实验室上海 200093 
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中文摘要:
      有机硅树脂-石英纤维丝复合绝缘层具有良好的耐温性能与绝缘性能,然而在长期高温条件下发生烧结脆化,容易脱落从降低绝缘性能。本文中详细地研究了有机硅树脂-石英纤维丝的高温损伤和力学性能下降机理。通过采用SEM表征了有机硅树脂-石英纤维丝复合绝缘层烧结前后形貌的变化,并结合XRD和FTIR测试了复合绝缘层烧结前后结构改变,应用TG-DSC 技术分析了石英纤维的析晶过程。测试结果表明,在高温下有机硅树脂能够促进石英纤维丝的烧结,并造成的内应力传递,使石英纤维丝形成大量的表面裂纹与缺陷。石英纤维丝无定型网络被破坏发生重排,析出γ-Al2O3晶体。两者共同的作用加剧石英纤维丝的热损伤。
英文摘要:
      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.
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