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Comparative Study on Super Fine Mesophase Powder and MCMB Used to Manufacture High-Density Isotropic Carbon Bulks
作者姓名:LI Tong-qia  *  HU Zi-juna  WANG Jun-shana  GUO Yu-minga  WANG Cheng-yangb aNational Key Laboratory of Advanced Functional Composite Materials  Aerospace Research Institute of Materials and Processing Technology  Beijing  China bKey Laboratory for Green Chemical Technology of State Education Ministry  School of Chemical Engineering and Technology  Tianjin University  Tianjin  China
作者单位:LI Tong-qia,*,HU Zi-juna,WANG Jun-shana,GUO Yu-minga,WANG Cheng-yangb aNational Key Laboratory of Advanced Functional Composite Materials,Aerospace Research Institute of Materials and Processing Technology,Beijing 100076,China bKey Laboratory for Green Chemical Technology of State Education Ministry,School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China
摘    要:Mesocarbon microbeads (MCMB) and super fine mesophase powder (SFMP) were prepared firstly from a coal tar pitch and then hot-condensed into high-density isotropic carbon (HDIC) bulks under 160 MPa and finally sintered at 1 000 ℃ . By analyzing the ther-mogravimetric behavior of the MCMB and SFMP powders, their volume shrinkage and weight loss during sintering and the bulk density and flexural strengths of their sintered bulks, it was found that the smaller sizes and the richer β-resin contents of SFMP have facilitated formation of sintered bulks with more compact isotropic structure and higher flexural strengths than MCMB. Because of the filling and bonding effects of SFMP on MCMB bulks, addition of SFMP, albeit a little, can greatly increase the flexural strengths of sintered bulks of MCMB. However, adding MCMB, even a slight amount, into SFMP can severely impair the flexural strength of sintered bulks. This might be attributed to both the crack initiation along the boundaries between MCMB and SFMP and the formation of layered texture of MCMB sphere.


Comparative Study on Super Fine Mesophase Powder and MCMB Used to Manufacture High-Density Isotropic Carbon Bulks
LI Tong-qia,*,HU Zi-juna,WANG Jun-shana,GUO Yu-minga,WANG Cheng-yangb aNational Key Laboratory of Advanced Functional Composite Materials,Aerospace Research Institute of Materials and Processing Technology,Beijing ,China bKey Laboratory for Green Chemical Technology of State Education Ministry,School of Chemical Engineering and Technology,Tianjin University,Tianjin ,China.Comparative Study on Super Fine Mesophase Powder and MCMB Used to Manufacture High-Density Isotropic Carbon Bulks[J].Chinese Journal of Aeronautics,2006,19(Z1).
Authors:LI Tong-qi  HU Zi-jun  WANG Jun-shan  GUO Yu-ming  WANG Cheng-yang
Abstract:Mesocarbon microbeads (MCMB) and super fine mesophase powder (SFMP) were prepared firstly from a coal tar pitch and then hot-condensed into high-density isotropic carbon (HDIC) bulks under 160 Mpa and finally sintered at 1 000 ℃. By analyzing the thermogravimetric behavior of the MCMB and SFMP powders, their volume shrinkage and weight loss during sintering and the bulk density and flexural strengths of their sintered bulks, it was found that the smaller sizes and the richer β-resin contents of SFMP have facilitated formation of sintered bulks with more compact isotropic structure and higher flexural strengths than MCMB. Because of the filling and bonding effects of SFMP on MCMB bulks, addition of SFMP, albeit a little, can greatly increase the flexural strengths of sintered bulks of MCMB. However, adding MCMB, even a slight amount, into SFMP can severely impair the flexural strength of sintered bulks. This might be attributed to both the crack initiation along the boundaries between MCMB and SFMP and the formation of layered texture of MCMB sphere.
Keywords:mesocarbon microbeads  super fine mesophase powder (SFMP)  high-density isotropic carbon (HDIC) bulk  sintered bulk
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