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通过SEM等手段对以芳纶纤维为原料,采用针刺工艺制备的应变隔离垫的微观结构、力学、粘接和耐温性能进行表征与分析。结果表明:当针刺密度为35针/cm2、材料密度为0.18 g/cm3时,材料具有很好的应变协调能力和力学性能,经200℃以下温度热处理,材料无明显变化,强度仍可达0.9 MPa。在风洞考核环境下,陶瓷瓦热防护组件最高表面温度1 500℃,风洞考核后,组件无开裂、松动现象,验证了应变隔离垫用于陶瓷瓦粘接的可靠性。
SEM and other means were used to characterize and analyze the microstructure, mechanics, bonding and temperature resistance of aramid fiber prepared by acupuncture using aramid fiber as raw material. The results show that the material has good strain coordination ability and mechanical properties when the needle punching density is 35 needles / cm 2 and the material density is 0.18 g / cm 3. After heat treatment at 200 ℃, the material has no obvious change and the strength can reach 0.9 MPa. In the wind tunnel assessment environment, the highest surface temperature of the ceramic tile thermal protection component is 1500 ℃. After the wind tunnel examination, the component has no cracking and looseness, which verifies the reliability of the strain isolation pad for ceramic tile bonding.