APP/层状硅酸盐填充UPR包覆层的耐烧蚀机理

将有机填料聚磷酸铵(APP)分别与层状硅酸盐类填料有机改性蒙脱土、滑石粉复配后填充UPR绝热包覆材料,通过氧乙炔烧蚀试验考察了复合材料的烧蚀性能.采用TG-DTG、SEM等研究有机-无机复配填料改性UPR包覆材料耐烧蚀性能的作用机理.结果表明,当APP与蒙脱土的质量比为20∶5,APP与滑石粉质量比为20∶30时,复合材料的耐烧蚀性能最佳,线烧蚀速率分别为0.317、0.363 mm/s.热分解试验600℃时,APP/有机改性蒙脱土/UPR的实际残留量比计算残留量增加8.2%,APP/滑石粉/UPR增加3.9%.烧蚀试验后APP/有机改性蒙脱土/UPR形成片层状残炭结构;APP/滑石粉/UPR生成较为松散的残炭.

Ablative Mechanism of APP/Phyllo-Silicate/UPR Inhibitor

The anti-ablation performance of UPR inhibitor filled by phyllo-silicate and ammonium polyphosphate(APP) was investigated by oxygen-acetylene ablation test. The anti-ablation mechanism of APP/phyllo-silicate/UPR composites were analyzed by TG-DTG and SEM. The results showed that the materials represented perfect anti-ablation property when mass ratio of APP and OMMT was 20∶5 or 20∶30 APP and talcum. The linear ablation rate was 0.317 mm·s~(-1)for APP/OMMT/UPR. The actural residuum at 600℃ increase 8.2% for APP/OMMT/UPR and 3.9% for APP/talcum power/UPR. The yield char was compact and tight APP/OMMT/UPR and relaxsa for APP/talcum powder/UPR composites after ablation test.