1.航天材料及工艺研究所，北京 100076;2.北京宇航系统工程研究所，北京 100076
1.Aerospace Research Institute of Materials & Processing Technology， Beijing 100076;2.Beijing Institute of Aerospace System Engineering， Beijing 100076
文 摘 本文以隔热瓦、氯化锂相变复合材料、硝酸锂定形相变复合材料和季戊四醇定形相变复合材料为原料制备了隔热-相变复合热防护构件及其纯隔热对比样,采用快速升温单侧加热装置测试了该构件与其纯隔热对比样在1200℃下的长时热防护性能。结果显示在相同加热时间7650s条件下,复合热防护构件的背温仅为222.3 ℃,而纯隔热对比样的背温为644.0 ℃,复合热防护构件的隔热能力更强。在相近背温条件下,复合热防护构件背温199.5℃时,其控温时间为6780 s,而纯隔热对比样背温199.7℃时,其控温时间为3135s,复合热防护构件的控温时间更长。隔热-相变复合热防护构件具有优异的热防护能力,是一种新型的热防护结构形式,在航天、航空、民用热防护等领域具有广阔的应用前景。
The conbined thermal insulation part composed of ceramic tile and phase change composites (PCC) was prepared by ceramic tile, LiCl PCC, LiNO3 PCC, and pentaerythritol PCC. The thermal perotecting performance of the conbined thermal insulation part and its reference sample were characterized in a single-sided heating test equipment at 1200 ℃. The results showed that the back temperature of the conbined thermal insulation part is 222.3 ℃ at the heating time of 7650 s, while the back temperature of the reference sample is 644.0 ℃, which indicates that the conbined thermal insulation part has better thermal insulation performance. The temperature control time for the conbined thermal insulation part is 6780 s at the back temperature of 199.5℃, while that of the reference sample is 3135 s at the back temperature of 199.7℃, which indicates the conbined thermal insulation part has much longer temperature control time at the close back temperature. All the above results suggest that the conbined thermal insulation part has better thermal insulation performance, is a novel thermal protecting structure, and will have broad application perspect in the fields of aerospace and civilan thermal protection.