{"title":"Mechanical Properties of 3D Noninterlaced Cf\/SiC Composites Prepared through Hybrid Process (CVI+PIP)","authors":"A. Udayakumar, M. Rizvan Basha, M. Stalin, V.V Bhanu Prasad","volume":93,"journal":"International Journal of Materials and Metallurgical Engineering","pagesStart":1021,"pagesEnd":1029,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/9999514","abstract":"
Three dimensional non-Interlaced carbon fibre
\r\nreinforced silicon carbide (3-D-Cf\/SiC) composites with pyrocarbon
\r\ninterphase were fabricated using isothermal chemical vapor
\r\ninfiltration (ICVI) combined with polymer impregnation pyrolysis
\r\n(PIP) process. Polysilazane (PSZ) is used as a preceramic polymer to
\r\nobtain silicon carbide matrix. Thermo gravimetric analysis (TGA),
\r\nInfrared spectroscopic analysis (IR) and X-ray diffraction (XRD)
\r\nanalysis were carried out on PSZ pyrolysed at different temperatures
\r\nto understand the pyrolysis and obtaining the optimum pyrolysing
\r\ncondition to yield β-SiC phase. The density of the composites was
\r\n1.94 g cm-3 after the 3-D carbon preform was SiC infiltrated for 280 h
\r\nwith one intermediate polysilazane pre-ceramic PIP process.
\r\nMechanical properties of the composite materials were investigated
\r\nunder tensile, flexural, shear and impact loading. The values of
\r\ntensile strength were 200 MPa at room temperature (RT) and 195
\r\nMPa at 500°C in air. The average RT flexural strength was 243 MPa.
\r\nThe lower flexural strength of these composites is because of the
\r\nporosity. The fracture toughness obtained from single edge notched
\r\nbeam (SENB) technique was 39 MPa.m1\/2. The work of fracture
\r\nobtained from the load-displacement curve of SENB test was 22.8
\r\nkJ.m-2. The composites exhibited excellent impact resistance and the
\r\ndynamic fracture toughness of 44.8 kJ.m-2 is achieved as determined
\r\nfrom instrumented Charpy impact test. The shear strength of the
\r\ncomposite was 93 MPa, which is significantly higher compared 2-D
\r\nCf\/SiC composites. Microstructure evaluation of fracture surfaces
\r\nrevealed the signatures of fracture processes and showed good
\r\nsupport for the higher toughness obtained.<\/p>\r\n","references":"[1] G. O. Young, \"Synthetic structure of industrial plastics (Book style with\r\npaper title and editor),\u201d in Plastics, 2nd ed. vol. 3, J. Peters, Ed. New\r\nYork: McGraw-Hill, 1964, pp. 15\u201364.\r\n[2] Laux, T., Ullmann, T., Auweter-Kurtz, M., Hald, H. and Kurz, A. 2001.\r\nInvestigation of thermal protection materials along an x-38 re-entry\r\ntrajectory by plasma wind tunnel simulations. In Second International\r\nSymposium on Atmospheric Re-entry Vehicles and Systems 2001.\r\nArcahon, France. P 1-9.\r\n[3] Kodama, H., Sakamoto, H. and Miyosh, T. 1989. Silicon Carbide\r\nMonofilament-Reinforced Silicon Nitride or Silicon Carbide Matrix\r\nComposites. J. Am. Ceram. Soc. 72: 551-558.\r\n[4] Nakano, K., Kamiya, A., Ogawa, H. and Nishino, Y. 1992. Fabrication\r\nand Mechanical Properties of Carbon Fiber Reinforced Silicon Carbide\r\nComposites. J. Jp. Ceram. Soc. 100: 472-475.\r\n[5] Jamet, J. 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