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为了得到一种轻质、高强度、耐烧灼的新型碳泡沫材料,以无定形A1N为添加剂,在空心微球/网络复合型碳泡沫的基础上,采用退火热处理工艺成功地制备出了A1N/C复合泡沫材料.通过扫描电镜、透射电镜对样品进行表征,测试结果表明无定形AIN在碳微球的表面重结晶为AIN晶须,其直径大约为50 nm左右,长度10μm以上,具有较大的长径比.X射线衍射峰证明样品石墨化程度高,且AIN晶须为六方结构.X射线光电子能谱测试发现在287.5 eV处有较明显的C—N峰出现,这表明A1N和碳泡沫在界面处通过C—N键结合.同时,对其力学性能进行测试,通过分析应力-应变测试结果,A1N/C复合泡沫材料的压缩强度为40.27 MPa,相对碳泡沫材料而言提高了近一个数量级.测试结果表明,A1N晶须显著增强了碳泡沫的压缩强度,这种新型复合泡沫材料有望应用于各种抗压减震航空材料.
In order to obtain a new type of lightweight, high-strength, burn-resistant carbon foam material, amorphous A1N as additive, based on the hollow microsphere / network composite carbon foam, the annealing heat treatment process was successfully prepared A1N / C composite foam.The samples were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results showed that the amorphous AIN was recrystallized to AIN whiskers on the surface of carbon microspheres with a diameter of about 50 nm and a length of 10 μm, The X-ray diffraction peak shows that the sample has a high degree of graphitization and the AIN whisker has a hexagonal structure.The X-ray photoelectron spectroscopy (XPS) test shows that there is a clear C-N peak at 287.5 eV, indicating that A1N and carbon At the same time, the mechanical properties of the foams were tested by C-N bond. The compressive strength of the A1N / C composite foams was 40.27 MPa by analyzing the results of the stress-strain test. Compared with carbon foam, An order of magnitude.The test results show that, A1N whiskers significantly enhanced the compressive strength of carbon foam, the new composite foam is expected to be applied to a variety of anti-compression aerospace materials.