碳化铪改性炭/炭复合材料喉衬的热化学烧蚀  

Thermochemical Erosion of Hafnium Carbide Modified Carbon/Carbon Composite Throat in a Small Solid Rocket Motor

作　　者：沈学涛[1] 李克智[1] 李贺军[1] 冯涛[1] 张磊磊[1] 王斌[1] 

机构地区：[1]西北工业大学陕西省炭/炭复合材料工程技术研究中心凝固技术国家重点实验室,西安710072

出　　处：《无机材料学报》2011年第4期427-432,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(50832004;50902111;50972120)~~

摘　　要：采用小型固体火箭发动机研究了碳化铪(HfC)改性炭/炭复合材料喉衬的热化学烧蚀.借助基于最小自由能原理的NASA-CEA程序计算了燃气组成,借助化学热力学软件FactSage计算了燃气组分与碳、HfC的化学反应.结果表明,燃气中的H2O、CO2和OH是碳和HfC的主要氧化组分,使材料发生热化学烧蚀;纤维-基体界面是烧蚀的薄弱环节,烧蚀沿着界面分别向碳纤维和基体方向推进.热化学作用(氧化)造成纤维变细,顶端呈锥状,基体变薄,呈壳状.Thermochemical erosion of hafnium carbide（HfC） modified carbon/carbon（C/C） composite throat was investigated using a hot-fire testing system in a small solid rocket motor.Chemical composition of the equilibrium combustion products was calculated by NASA-CEA program based on the principle of free energy minimum.The reaction products between the oxidizing species and HfC in the C/C composites were also calculated by FactSage.The results show that H2O,CO2,and OH are the main oxidizing species to consume carbon and HfC and generate thermochemical erosion to the throat materials.The interface of the fibers and matrix is preferentially ablated,and then erosion extends to the fibers and matrix.The formation of cone-shaped fibers and shell-shaped matrix is attributed to the thermochemical erosion of the flame.

关 键 词：固体火箭发动机 炭/炭复合材料 碳化铪 烧蚀 

分 类 号：TB332[一般工业技术—材料科学与工程]