CSiC复合材料的常压制备与性能研究-

1、224Vol.22,No.4 20077Journal of Inorganic Materials Jul.,2007:1000-324X(200704-0685-05C/SiC1,2,1,1,1,2,1(1.200050;2.1000390/90C/SiC1100C-SiC232MPa,10.50MPa·m1/2./TQ174APressureless Preparation and Properties of C/SiC Composites ZHU Yun-Zhou1,2,HUANG Zheng-Ren1,DONG Shao-Ming1,YUAN Ming1,2,JIANG

2、Dong-Liang1(1.Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai200050,China; 2.GraduateUniversity of the Chinese Academy of Sciences,Beijing100049,ChinaAbstract:Polycarbosilane was used as the preceramic for matrix formation and2D layered0/90C fabrics as the reinforcement to fabric

3、ate C/SiC composites.The eect of pyrolysis temperature andslurry concentration on the properties of the composites was systematically studied.The results show that theexural stress increase with the increase of both pyrolysis temperature and slurry concentration.The matrix distribution inber bundle

4、is quite homogeneous,but some small pores still exist after eight pyrolysis cycles.When the composite is pyrolyzed at1100C,-SiC begins to form in the matrix.Theexural stress and toughness reach232MPa and10.50MPa·m1/2,respectively.Observation of long pull-outbers in the fracture surface demonstr

5、ates a toughened fracture behavior of the composite.Key words C/SiC composite;polymer inltration and pyrolysis;mechanical properties113.C/SiC456,768622Fiber Density Strength Modulus DiameterFilamenttype/g·cm3/MPa/GPa/µm2.2TG-DSC Shi-madzu TGA-50HRikagu RAX-10A XArchimedes Instron-55662.5mm×5mm×35mm,24mm,0.5mm/min,2.5mm ×5mm×35mm,20mm, 2.45mm,0.05mm/min.Shimadzu EPMA-8705QH33.11.200C TG200300C300C TGSiH SiCH3H2CH4700C10.700C TG60wt%. DSC683C 1Fig.1TG-DSC curve of preceramic pyrolysis p