ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Polymer impregnation pyrolysis method (PIP method) has some advantages to fabricateSiC fiber /SiC composite with large or complex form. However polymer derived SiC containssome amount of excess carbon and porosity. In particular the excess carbon is easy to be oxidizedin air at high temperature. Therefore reliability of the composite is not sufficient for long term use,because the oxidized matrix makes strong bonding between the fiber and the matrix. In this study,TiO2 as a reactive filler was added into polymer to consume the excess carbon by chemical reaction.Polycarbosilane (PCS) was used as a precursor polymer to synthesize a SiC matrix. It wasconfirmed that TiO2 was formed TiC on reaction with PCS over 1673 K by preliminary study. SiCfiber, Hi-Nicalon®, was used as reinforcement. Al2O3 powder was coated on surface of SiC fiberas interface layer of fiber/matrix. TiO2 added PCS/hexane solution was compounded with thefiber tow by filament winding. SiC fiber/SiC composite was synthesized at 1673 K for 3.6 ks inAr. The composite was densified by reinfiltration of TiO2 added PCS solution and pyrolysis at1673 K. Though densification behavior of the composite with TiO2 is slower than compositewithout TiO2, it was suggested that composition of synthesized SiC is close to stoichiometric one byapparent density. Fracture behavior of the composite indicated that addition of TiO2 was increasebonding strength between fiber and matrix. Bending strength of composite was increased afteroxidation test at 1473 K for 360 ks in air atmosphere
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.487.pdf
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