Influence of polymer infiltration and pyrolysis process on mechanical strength of polycarbosilane-derived silicon carbide ceramics |
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Authors: | Takahiro Namazu Tomohiro Ishikawa Yoshio Hasegawa |
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Affiliation: | (1) Department of Mechanical and Systems Engineering, Division of Mechanical Systems, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2201, Japan;(2) R&D Division, ART KAGAKU Co., Ltd, 3135-20, Muramatsu, Tokai-mura, Naka-gun, Ibaraki 319-1112, Japan |
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Abstract: | In this article, strength evaluation of silicon carbide (Si–C) ceramics fabricated from polycarbosilane (PCS) precursor is
described. Si–C ceramics was prepared by firing a green body made of the mixture of Si–C nano-powders and a PCS solution at
1,273 K in N2 gas for an hour. To obtain dense Si–C, the solution was infiltrated into the produced body, and then it was fired again.
The polymer infiltration and pyrolysis (PIP) process was conducted up to 12 cycles. Si–C ceramics was diced to be rectangle
shape measuring 1.0 mm × 3.0 mm × 0.5 mm, and was subjected to the three-point bending test for measurement of the Young’s
modulus and bending strength. Si–C specimens fabricated through PIP processes less than 2 cycles showed non-linear force–displacement
curves like a polymer, whereas those through the processes more than 3 cycles showed linear relations and fractured in a brittle
manner. The Young’s modulus of 12-cycles-PIPs specimen was found to be 56 GPa on average, which was approximately 22-fold
of non-PIP specimen. The bending strength was also increased with an increase in the number of PIP process. The maximum value
was found to be 157 MPa. The cause of the influence of PIP process on the mechanical characteristics is discussed using a
PCS-derived Si–C model. |
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