Preparation of SiC-based cellular substrate by pressure-pulsed chemical vapor infiltration into honeycomb-shaped paper preforms |
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Authors: | Y Ohzawa K Nakane V Gupta T Nakajima |
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Affiliation: | (1) Department of Applied Chemistry, Aichi Institute of Technology, Yachigusa 1247, Yakusa-cho Toyota, 470-0392, Japan |
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Abstract: | Using a pressure-pulsed chemical vapor infiltration technique, SiC was infiltrated from a SiCl4 (4%)–CH4 (4%)–H2 gas phase into carbonized paper preforms at 1100°C. SiC-based cellular substrates with cell wall thicknesses of 25, 50 and 100 m were obtained by using honeycomb-shaped paper preforms as the templates. The reduction of both wall thickness t and cell pitch d of SiC-based honeycomb substrate successfully led to an increase in geometric surface area per unit volume S, keeping pressure drop P at constant, besides; P decreased without lowering S by the reduction of t and the increase in d. The pressure drop in the prepared honeycomb substrates depended on S
2 –3 value, where was open frontal area fraction. The compressive strength of the honeycomb substrates with t of 25 m was about 7 MPa. The strength increased in proportion with 1 – , which corresponded to the volume fraction of the cell wall in the honeycomb substrate. |
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