热处理对各向同性热解炭材料微观结构和力学性能的影响  

Influence of heat treatment on microstructure and mechanical properties of isotropic pyrolytic carbon

作　　者：吴峻峰[1] 白朔[1] 成会明[1] 

机构地区：[1]中国科学院金属研究所沈阳材料科学国家(联合)实验室,辽宁沈阳110016

出　　处：《新型炭材料》2006年第3期225-230,共6页New Carbon Materials

基　　金：国家863项目(2002AA305401)~~

摘　　要：对化学气相沉积法(CVD)制备的各向同性热解炭材料在不同温度下进行热处理,利用金相显微镜、扫描电镜、透射电镜、X射线衍射和显微激光喇曼光谱等表征手段及显微硬度实验、三点弯曲实验,研究了材料的微观结构和力学性能与热处理温度之间的关系。结果表明,随着热处理温度的提高,各向同性热解炭材料的石墨片层间距缩小,石墨化程度增加,晶粒尺寸增大,同时材料中的孔隙结构也发生了较大的变化。材料的显微硬度和弹性模量随热处理温度的升高而降低,抗弯强度在1 750℃和2 400℃之间没有变化,在2 600℃时有显著的增加。The influence of heat treatment on the microstructure and mechanical properties of isotropic pyrolytic carbon prepared by chemical vapor deposition was studied by TEM, SEM, XRD, polarized light metallography, laser Raman spectroscopy, microhardness and three-point bend tests. Results show that the interlayer spacing of the pyrolytic carbon decreases and the crystal size increases with increasing heat treatment temperature. At the same time, the microhardness and the elastic modulus decrease with increasing heat treatment temperature. Heat treatment below 2400 ℃ has no effect on the flexural strength of the isotropic pyrolytic carbon ,but its flexural strength increases after graphitization at 2600 ℃. It is observed that the high temperature heat treatment has changed the pore structure, which consequently influences the mechanical properties.

关 键 词：各向同性热解炭 热处理 微观结构 力学性能 

分 类 号：O613.71[理学—无机化学]