浸泡腐蚀对玻璃纤维-空心玻璃微珠/环氧树脂复合泡沫材料弯曲性能的影响

制备了不同纤维质量分数的玻璃纤维-空心玻璃微珠/环氧树脂复合泡沫材料。通过三点弯曲试验研究了纤维质量分数对复合泡沫材料力学性能的影响。将复合泡沫材料试件置于蒸馏水和海水中浸泡,研究了浸泡腐蚀对试件弯曲性能的影响,并结合扫描电镜照片分析其原因。研究表明:纤维质量分数越高,玻璃纤维-空心玻璃微珠/环氧树脂复合泡沫材料的吸湿率越大,且在蒸馏水中的吸湿率较海水中的更大。试件的弯曲强度随纤维质量分数增加而增大,当纤维质量分数为10%时达到最大,比未添加纤维的试件增强了51%,之后则随纤维质量分数增加逐渐降低。浸泡腐蚀降低了试件的弯曲性能,其中海水浸泡后的试件弯曲性能最低。玻璃纤维-空心玻璃微珠/环氧树脂复合泡沫材料弯曲强度降低的直接原因是浸泡腐蚀使得部分玻璃微珠和玻璃纤维与环氧树脂基体间的界面层受到破坏。

Influence of soak corrosion on flexural properties of glass fiber-hollow glass microsphere/epoxy syntactic foam material

The glass fiber-hollow glass microsphere/epoxy syntactic foam material with different fiber mass fractions were prepared. The effects of fiber mass fraction on mechanical properties of composite foam material were studied by three point bending test. Composite foam material specimens were put in distilled water and seawater. The influences of soak corrosion on flexural properties of specimens were studied, and the reasons were analyzed by combining with the scanning electron microscopy photos. The research reveals that the moisture rate of glass fiber-hollow glass microsphere/epoxy composites increases with the increase of fiber mass fraction, and the moisture rate of specimen in distilled water is greater than that of specimen in seawater. The flexural strength of specimens increases with the increasing fiber mass fraction, and it goes to be maximum when the fiber mass fraction is 10%, more than that of specimen without fiber by 51%, then it decreases with further adding fibers. The flexural properties of specimens are reduced by soak corrosion, and it is lower in seawater than that in distilled water. The interface layers between glass microsphere, glass fiber and epoxy matrix are damaged by soak corrosion, and it is the reason of the decrease of flexural strength of glass fiber-hollow glass microsphere/epoxy composites.