新型透波准陶瓷基体材料

对含乙烯基陶瓷前驱体PSN1的固化工艺及其经准陶瓷化后所得材料的性能进行了研究。采用TGA、DMA对准陶瓷基体的热性能进行了表征。结果表明:其分解温度及800℃残重率随准陶瓷化温度升高而升高,N2气氛下分别达到580℃和87%,空气气氛中分解温度高于550℃,残重率达95%以上,Tg也随准陶瓷化温度上升而升高,420℃准陶瓷化基体在400℃以下没有明显的玻璃化转变。运用网络矢量分析仪测定了介电常数随温度和频率的变化情况,结果表明准陶瓷基体介电常数小于3,并且随温度和频率变化不大。准陶瓷基体吸水率较低,最低达到0.03%。初步研究表明PSN1准陶瓷基体具有良好的热、介电稳定性,吸水率低,有望用作耐高温透波复合材料基体。

New Type of Wave Penetrating Quasi Ceramic Matrix

The curing process and quasiceramic properties of vinylcontaining polysilazane ceramic precursor PSN1 were studied. TGA and DMA were employed to investigate the thermal properties. The data show the decomposition temperature and the residue weight of the quasi-ceramic matrix with the increase of quasi-ceramic temperature,580 and 87% are achieved under N2 atmosphere while above 550 and 95% are achieved under air atmosphere respectively. No obvious Tgof the 420 guasi-ceramic is observed below 400. Network vector analyzers data show the dielectric constant is below 3 and just changed slightly with the temperature and frequency. Water uptake measurement shows the quasi-ceramic matrix has low water uptake properties, with the minimum of 0.03%. All the data show the quasi-ceramic PSN1 matrix is potential to be used in wave-penetrating composites.