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.
The microstructure,tensile strength,bonding properties,high temperature resistance of strain isolation pad,which was prepared by needle process with aramid fibers as material are investigated.The results show that strain isolation pad has good coordinate deformation capacity and tensile strength when the punch density is 35 punches/cm2 and the material density is 0.18 g/cm3.When the heating temperature is lower than 200℃,there is no significant change of structures and intensity.At the wind tunnel environment,maximum surface temperature is 1500℃,the apparece of the thermal protection system is complete with no cracks and no looseness after the wind tunnel test,the test results validate the reliability of strain isoation pad.
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