CAJ | 학술논문

分别制备了预分散酚醛中空微球填充三元乙丙橡胶绝热层和梯度化三元乙丙橡胶绝热层,旨在开发低密度的新型高性能绝热材料.扫描电镜观察表明,预分散酚醛中空微球能完好、均匀地分散于三元乙丙橡胶基体中.由于酚醛中空微球具有很低的粒子密度和高的热阻性能,随预分散酚醛中空微球含量的增加.绝热层的密度、热导率和热扩散率显著降低,同时绝热层的比热容明显增大,表现出优异的绝热性能.与芳砜纶浆粕填充三元乙丙橡胶绝热层、酚醛中空微球填充三元乙丙橡胶绝热层相比,梯度化三元乙丙橡胶绝热层具有优异的绝热性能和耐烧蚀性能,同时又具有很低的密度,将在火箭发动机上具有广阔的应用前景.
분별제비료예분산분철중공미구전충삼원을병상효절열층화제도화삼원을병상효절열층,지재개발저밀도적신형고성능절열재료.소묘전경관찰표명,예분산분철중공미구능완호、균균지분산우삼원을병상효기체중.유우분철중공미구구유흔저적입자밀도화고적열조성능,수예분산분철중공미구함량적증가.절열층적밀도、열도솔화열확산솔현저강저,동시절열층적비열용명현증대,표현출우이적절열성능.여방풍륜장박전충삼원을병상효절열층、분철중공미구전충삼원을병상효절열층상비,제도화삼원을병상효절열층구유우이적절열성능화내소식성능,동시우구유흔저적밀도,장재화전발동궤상구유엄활적응용전경.
thylene-propylene-diene elastomer (EPDM) thermal insulator filled with pre-dispersed hollow phenolic micro-spheres and functionally graded EPDM thermal insulator were prepared as high performance thermal insulating materials with low density. Experimental results show that the pre-dispersed micro-spheres in the EPDM matrix are undamaged and homogeneous dis-persed, which was observed with scanning electron microscopy (SEM). With the increase of the content of the pre-dispersed hollow phenolic micro-sphere, the density, thermal conductivity and thermal diffusivity of EPDM thermal insulator decrease linearly and specific heat of the insulator increase greatly, owing to the low particle density and high thermal resistance of hollow phenolic micro-spheres. Compared to both thermal insulators filled with hollow phenolic micro-spheres and polysulfonamide (PSA) pulp, function-ally graded thermal insulator show excellent thermal insulating and ablation properties as well as very low density, exhibiting an ap-plication potential as high performance thermal insulator in advanced rocket motors.