摘要
以糠酮树脂作粘结剂，添加树脂碳微粉、硼类催化剂、短切ＰＡＮ基高强碳纤维，制得了含硼Ｃ／Ｃ复合材料。通过Ｘ射线衍射（ＸＲＤ）、Ｘ射线光电子能谱（ＸＰＳ）等手段，检测了硼、氧化硼在Ｃ／Ｃ中的状态，研究了它们对Ｃ／Ｃ复合材料的催化石墨化作用，分析了石墨化温度、催化剂种类及其用量对石墨化度的影响。结果表明，硼以固溶体的形式存在Ｃ／Ｃ复合材料，通过吸电子断键、代替碳原子消除缺陷等机理形式，使最难石墨化的玻璃碳和纤维碳达到了石墨化。在石墨化温度是２１００℃、催化剂硼用量小于５．０ｗｔ％工艺条件下，玻璃碳基Ｃ／Ｃ的石墨化度达到了８２％，而无催化剂的Ｃ／Ｃ在２５００℃下石墨化度才达到７１％。这表明硼在降低石墨化温度方面有明显作用。
The boron doped short carbon fiber reinforced furfuryl acetone resin derived glassy carbon matrix C/C composites were fabricated by addition of powdered carbon and boron.By means of XRD,XPS,the state of boron,boron oxide and the effects of their catalystic graphitization in C/C were studied;the affecting factors to graphitization degree including temperature,catalytic kinds and catalyst amount were also analysed.In result,boron exists in C/C in the state of solid solution;through such catalytic mechanisms and attracting electron to break bond,replacing carbon atom to eliminate defects,the glassy carbon and fibrous carbon,which are more non graphitizable,can get higher graphitization degree.On condition that temperature is 2100℃,boron is less than 5 0wt%,the graphitization degree of glassy carbon matrix C/C is up to 82%,which is increased by 11% than that of 2500℃ graphitized C/C without catalyst It is shown that boron can decrease graphitization temperature sharply.
出处
《材料工程》
EI
CAS
CSCD
北大核心
1998年第12期3-7,共5页
Journal of Materials Engineering
关键词
催化
硼
石墨化
复合材料
碳/碳
catalytic graphitization boron graphitization carbon/carbon composites
