摘要:
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.
Abstract:
In order to obtain a new type of carbon foam material,AlN/C composite foam is successfully synthesized by using AlN as an additive and hollow microsphere/reticulated carbon foam as a basis through the annealing high-temperature heated process.The prepared samples are characterized by scanning electron microscope（SEM） and transmission electron microscope（TEM）.The results indicate that AlN whisker with a diameter of 50 nm,a length large than 10μm and a larger length-diameter ratio is prepared by amorphous AlN recrystallization at the surface of carbon microsphere.Diffraction peaks of XRD demonstrate that the sample is characterized as graphitization and AlN whisker has a hexagonal structure.XPS test shows that there is an obvious peak of C—N bond of 287.5 eV,which reveals that AlN and carbon foam through C—N bond are combined at their interface.Meanwhile,it is shown that the compression strength of AlN/C foam material is 40.27 MPa through the analysis of the stress-strain of mechanical performance, which increases nearly one order of magnitude compared with the carbon foam material.The results of test show that compressive strength of carbon foam is obviouly reinforced by AlN whisker.And this new composite foam has applications value in various kinds of resist compression and absorbing aeronautical materials.
首页
登录
注册
下载: