Fabrication and properties of reaction-formed SiC by infiltrating molten Si into mesocarbon microbeads-based carbon preform

Abstract Reaction-formed SiC ceramic was fabricated by infiltrating molten Si into the carbon preform derived from a mixture of mesocarbon microbeads (MCMBs) and SiC powders which content was ranged from 10 to 40 wt.%. SiC powder limited the volume shrinkage of MCMBs during sintering and the porosity of the preform can be adjusted by altering SiC powder content. Aromatic layers in the carbon spheres derived from MCMBs were split below 1300 °C due to the graphitization effect of SiC powder. Molten Si infiltrated into the interfaces between carbon spheres as well as the microcracks inside the split spheres. As a result, network SiC ceramic was formed and some unreacted carbon distributed uniformly in the matrix. The reaction-formed SiC ceramics have excellent mechanical properties (the maximum bending strength, fracture toughness and hardness of 359 MPa, 4.4 MPa m 1/2 and 2348 Hv, respectively) and electrical conductivity (the lowest electric resistivity of 18.18 μΩ m).

[1]  M. Kornfeld,et al.  Development of SiC–Si composites with fine-grained SiC microstructures , 1999 .

[2]  Y. Sung.  Mechanical and Thermal Properties of Graphite Fiber–Reinforced Cordierite Glass–Ceramic Matrix Composites , 1999 .

[3]  M. Wilhelm,et al.  Influence of resin content and compaction pressure on the mechanical properties of SiC–Si composites with sub-micron SiC microstructures , 2001 .

[4]  Y. Korai,et al.  Chemistry of synthesis, structure, preparation and application of aromatic-derived mesophase pitch , 2000 .

[5]  A. Varma,et al.  Processing of mesocarbon microbeads to high-performance materials: Part I. Studies towards the sintering mechanism , 2004 .

[6]  C. García-Rosales,et al.  Improvement of the thermo-mechanical properties of fine grain graphite by doping with different carbides , 2002 .

[7]  A. Varma,et al.  Processing of mesocarbon microbeads to high-performance materials: Part II. Reaction bonding by in situ silicon carbide and nitride formation , 2006 .

[8]  Y. Korai,et al.  Carbon disc of high density and strength prepared from synthetic pitch-derived mesocarbon microbeads , 1999 .

[9]  Dichen Li,et al.  Reaction forming of silicon carbide ceramic using phenolic resin derived porous carbon preform , 2009 .

[10]  Takafumi Yoshimura,et al.  Carbon disc of high density and strength prepared from heat-treated mesophase pitch grains , 1995 .

[11]  Y. Chiang,et al.  Reaction-formed silicon carbide , 1991 .

[12]  D. Jiang,et al.  The effect of porous carbon preform and the infiltration process on the properties of reaction-formed SiC , 2004 .

[13]  Junmin Qian,et al.  Microstructure and mechanical properties of C/C-SiC composites fabricated by a rapid processing method , 2009 .

[14]  X. Zhang,et al.  Electrical resistivity and microstructure of pressureless reactive sintered MOSi2-SiC composite , 2004 .

[15]  G. Wen,et al.  Reaction-formed W2B5/C composites with high performance , 2006 .

[16]  K. Hu,et al.  Catalytic effect of dopants on microstructure and performance of MCMB-derived carbon laminations , 2004 .

[17]  Zhan-jun Liu,et al.  Effect of Ti dopant on shrinkage and performance of MCMB-derived carbon laminations , 2007 .

[18]  M. Martínez-Escandell,et al.  The combined effect of porosity and reactivity of the carbon preforms on the properties of SiC produced by reactive infiltration with liquid Si , 2009 .

[19]  Y. Chiang,et al.  Reaction-infiltrated, net-shape SiC composites , 1995 .

[20]  Xiaojun Hu,et al.  Electrical and structural properties of boron and phosphorus co-doped diamond films , 2004 .

[21]  Dajie Zhang,et al.  Microstructural evolution during silicon carbide (SiC) formation by liquid silicon infiltration using optical microscopy , 2010 .

[22]  D. R. Behrendt,et al.  Reactive melt infiltration of silicon-molybdenum alloys into microporous carbon preforms , 1995 .

[23]  D. R. Behrendt,et al.  Microstructure and Mechanical Properties of Reaction-Formed Silicon Carbide (RFSC) Ceramics , 1994 .

[24]  Shoko Suyama,et al.  Development of high-strength reaction-sintered silicon carbide , 2003 .