EPDM绝热材料炭化层的三维孔隙结构特征  

Three-dimensional porosity characteristics of charring layer of EPDM insulation material

作　　者：孙翔宇[1,2] 张炜[1] 杨宏林[2] 陈思[2] 王德[2] 高金凤[2] 

机构地区：[1]国防科技大学航天与材料工程学院,长沙410073 [2]中国航天科工集团六院,呼和浩特010010

出　　处：《固体火箭技术》2011年第5期644-647,共4页Journal of Solid Rocket Technology

摘　　要：为了获得绝热材料炭化层的微观结构信息,建立了炭化层三维孔隙结构的微米CT无损测试方法。采用微米CT对EPDM绝热材料炭化层进行了无损扫描,运用三维图像处理软件对炭化层的系列无损扫描图片进行了三维重建。针对发动机热试车后EPDM绝热材料炭化层试样,结合二维图像分析软件,研究了烧蚀方向上炭化层的孔隙结构特征。结果表明,过载烧蚀试验发动机中形成的EPDM绝热材料炭化层从表层向下呈现致密-疏松结构,炭化层的平均孔径和孔隙率都逐步增大。A novel nondestructive measurement method was established to get 3D porous structure of charring layer by means of micro CT.The charring layer sample of EPDM insulation material for over-loading motor firing test was inspected by micro CT.The 3D porous structure image of the charring layer was rebuilt based on the micro CT photos by means of 3D image processing software.Furthermore,the porous structure characteristics of the charring layer along the ablation direction was obtained combining 2D image processing software.The results show that the porosity and average pore diameter of charring layer of EPDM insulation material increase gradually from the surface to the inner,and charring layer presents from denser to looser porosity structure along the direction of ablation.

关 键 词：EPDM绝热材料 炭化层 三维孔隙结构 微米CT 孔径 孔隙率 

分 类 号：V255.3[一般工业技术—材料科学与工程]